Author | Topic |
Registered: January 2004
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Is 5 valve better than 4 valve?
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Fri, 27 May 2005 12:54
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I have got my hands on an SAE technical paper titled 'Optimization of multi valve, four cycle engine design-the benefit of 5 valve technology' research done by Yamaha.Basically what Yamaha did was test head designs from 4 valve to 7 valve, throught their research they found 5 valve to be the best (I suppose their R1 motorbike is testiment to that!), some of the technical aspects gleaned from this paper include;(this is all compared to 4,6,7 valve heads, most test data was between a 4 valve and 5 valve motor with identical, comp ratio, bore/stroke etc, so basically they are comparing apples with apples, the only difference is the number of valves)
They found 5 valve to give the best intake valve opening area.
Intake valve opening area at maximum lift was greater by 25%.
5 valve allowed better placement of spark plug position.
Higher combustion efficiency.
Higher volumetric efficiency through all rev range (high speed AND low speed).
Higher engine flow rates at all valve lifts, up 25% at lower lifts.
Lighter valve train due to smaller valves resulting in higher rpm, therefore more power.
Higher intake and exhaust inertial tuning(scavenging)
Higher BMEP(brake mean effective pressure) through the whole rev range.
They found that if the 4 and 5 valve engines had the same valve opening area that the five valve had significantly higher volumetric efficiency which would give a broader power curve.
Being the owner of a 5 valve 4age and comparing my ride to 4 valvers I can see why mine performs so much better than any 4 valve I've been in, it will be interesting to see what the 'Arm chair experts(read 5 valve knockers)' think!!!! But I suppose all these arm chair experts spend more money on R&D than Yamaha
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| Subject | Poster | Date |
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Is 5 valve better than 4 valve?
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170bhp | Fri, 27 May 2005 12:54 |
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Re: Is 5 valve better than 4 valve?
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Big T | Fri, 27 May 2005 13:39 |
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Re: Is 5 valve better than 4 valve?
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oldcorollas | Fri, 27 May 2005 14:49 |
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Re: Is 5 valve better than 4 valve?
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takai | Fri, 27 May 2005 15:09 |
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Re: Is 5 valve better than 4 valve?
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Jonny2TG | Fri, 27 May 2005 15:34 |
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Re: Is 5 valve better than 4 valve?
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takai | Sat, 28 May 2005 00:26 |
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Re: Is 5 valve better than 4 valve?
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CLG | Sat, 28 May 2005 01:12 |
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Re: Is 5 valve better than 4 valve?
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Jonny2TG | Sat, 28 May 2005 01:42 |
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Re: Is 5 valve better than 4 valve?
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170bhp | Sat, 28 May 2005 05:16 |
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Re: Is 5 valve better than 4 valve?
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floody | Tue, 31 May 2005 13:06 |
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Re: Is 5 valve better than 4 valve?
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Bill Sherwood | Sat, 28 May 2005 05:33 |
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Re: Is 5 valve better than 4 valve?
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Henn | Sat, 28 May 2005 05:41 |
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Re: Is 5 valve better than 4 valve?
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Bill Sherwood | Sat, 28 May 2005 05:48 |
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Re: Is 5 valve better than 4 valve?
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Bill Sherwood | Sat, 28 May 2005 05:46 |
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Re: Is 5 valve better than 4 valve?
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170bhp | Sat, 28 May 2005 06:05 |
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Re: Is 5 valve better than 4 valve?
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Bill Sherwood | Sat, 28 May 2005 06:07 |
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Re: Is 5 valve better than 4 valve?
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Acoustic | Tue, 31 May 2005 16:03 |
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Re: Is 5 valve better than 4 valve?
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170bhp | Sat, 28 May 2005 06:10 |
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Re: Is 5 valve better than 4 valve?
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Bill Sherwood | Sat, 28 May 2005 06:15 |
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Re: Is 5 valve better than 4 valve?
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170bhp | Sat, 28 May 2005 06:14 |
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Re: Is 5 valve better than 4 valve?
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Bill Sherwood | Sat, 28 May 2005 06:17 |
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Re: Is 5 valve better than 4 valve?
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shinybluesteel | Sat, 28 May 2005 06:40 |
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Re: Is 5 valve better than 4 valve?
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JFAllen | Sat, 28 May 2005 07:28 |
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Re: Is 5 valve better than 4 valve?
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170bhp | Sat, 28 May 2005 06:39 |
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Re: Is 5 valve better than 4 valve?
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Bill Sherwood | Sat, 28 May 2005 06:43 |
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Re: Is 5 valve better than 4 valve?
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170bhp | Sat, 28 May 2005 06:43 |
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Re: Is 5 valve better than 4 valve?
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170bhp | Sat, 28 May 2005 06:45 |
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Re: Is 5 valve better than 4 valve?
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170bhp | Sat, 28 May 2005 06:48 |
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Re: Is 5 valve better than 4 valve?
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170bhp | Sat, 28 May 2005 06:58 |
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Re: Is 5 valve better than 4 valve?
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Jonny2TG | Sat, 28 May 2005 07:52 |
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Re: Is 5 valve better than 4 valve?
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takai | Sat, 28 May 2005 08:24 |
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Re: Is 5 valve better than 4 valve?
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bored | Sat, 28 May 2005 10:45 |
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Re: Is 5 valve better than 4 valve?
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Bill Sherwood | Sat, 28 May 2005 10:08 |
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Re: Is 5 valve better than 4 valve?
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170bhp | Sat, 28 May 2005 11:12 |
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Re: Is 5 valve better than 4 valve?
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170bhp | Sat, 28 May 2005 11:14 |
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Re: Is 5 valve better than 4 valve?
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Bill Sherwood | Sat, 28 May 2005 11:24 |
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Re: Is 5 valve better than 4 valve?
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takai | Sat, 28 May 2005 11:19 |
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Re: Is 5 valve better than 4 valve?
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170bhp | Sat, 28 May 2005 11:32 |
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Re: Is 5 valve better than 4 valve?
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bored | Sat, 28 May 2005 11:40 |
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Re: Is 5 valve better than 4 valve?
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takai | Sat, 28 May 2005 11:43 |
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Re: Is 5 valve better than 4 valve?
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170bhp | Sat, 28 May 2005 11:48 |
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Re: Is 5 valve better than 4 valve?
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170bhp | Sat, 28 May 2005 11:49 |
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Re: Is 5 valve better than 4 valve?
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takai | Sat, 28 May 2005 11:53 |
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Re: Is 5 valve better than 4 valve?
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IRA11Y | Mon, 06 June 2005 07:26 |
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Re: Is 5 valve better than 4 valve?
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ke382TG | Sat, 28 May 2005 11:50 |
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Re: Is 5 valve better than 4 valve?
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170bhp | Sat, 28 May 2005 11:59 |
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Re: Is 5 valve better than 4 valve?
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ke382TG | Sat, 28 May 2005 12:37 |
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Re: Is 5 valve better than 4 valve?
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Bill Sherwood | Sat, 28 May 2005 13:58 |
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Re: Is 5 valve better than 4 valve?
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boudan | Sat, 28 May 2005 15:22 |
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Re: Is 5 valve better than 4 valve?
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Acoustic | Tue, 31 May 2005 16:16 |
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Re: Is 5 valve better than 4 valve?
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*rivmasta* | Wed, 01 June 2005 00:38 |
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Re: Is 5 valve better than 4 valve?
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off-road | Sun, 05 June 2005 09:14 |
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Re: Is 5 valve better than 4 valve?
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off-road | Sun, 05 June 2005 09:31 |
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Re: Is 5 valve better than 4 valve?
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Bill Sherwood | Sun, 29 May 2005 01:29 |
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Re: Is 5 valve better than 4 valve?
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Ben Wilson | Tue, 31 May 2005 00:03 |
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Re: Is 5 valve better than 4 valve?
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Joshstix | Sun, 29 May 2005 02:26 |
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Re: Is 5 valve better than 4 valve?
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Bill Sherwood | Sun, 29 May 2005 08:14 |
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Re: Is 5 valve better than 4 valve?
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SEXY 16 | Sun, 29 May 2005 09:41 |
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Re: Is 5 valve better than 4 valve?
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river | Sun, 29 May 2005 11:53 |
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Re: Is 5 valve better than 4 valve?
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170bhp | Sun, 29 May 2005 12:00 |
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Re: Is 5 valve better than 4 valve?
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Bill Sherwood | Sun, 29 May 2005 12:08 |
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Re: Is 5 valve better than 4 valve?
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170bhp | Sun, 29 May 2005 12:11 |
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Re: Is 5 valve better than 4 valve?
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Mr Revhead | Sun, 29 May 2005 12:34 |
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Re: Is 5 valve better than 4 valve?
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oldcorollas | Sun, 29 May 2005 13:35 |
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Re: Is 5 valve better than 4 valve?
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ROLLA GTi | Sun, 29 May 2005 13:45 |
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Re: Is 5 valve better than 4 valve?
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Jonny2TG | Sun, 29 May 2005 14:15 |
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Re: Is 5 valve better than 4 valve?
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Bill Sherwood | Sun, 29 May 2005 14:58 |
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Re: Is 5 valve better than 4 valve?
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THE WITZL | Mon, 30 May 2005 02:34 |
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Re: Is 5 valve better than 4 valve?
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funkdoc | Mon, 30 May 2005 11:02 |
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Re: Is 5 valve better than 4 valve?
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4agte | Mon, 06 June 2005 08:18 |
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Re: Is 5 valve better than 4 valve?
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floody | Mon, 06 June 2005 09:57 |
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Re: Is 5 valve better than 4 valve?
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4agte | Mon, 06 June 2005 10:10 |
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Re: Is 5 valve better than 4 valve?
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floody | Tue, 07 June 2005 04:13 |
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Re: Is 5 valve better than 4 valve?
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170bhp | Mon, 30 May 2005 09:14 |
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Re: Is 5 valve better than 4 valve?
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170bhp | Mon, 30 May 2005 09:18 |
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Re: Is 5 valve better than 4 valve?
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Bill Sherwood | Tue, 31 May 2005 10:36 |
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Re: Is 5 valve better than 4 valve?
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Jonny2TG | Mon, 30 May 2005 15:37 |
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Re: Is 5 valve better than 4 valve?
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Johnny | Mon, 30 May 2005 15:55 |
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Re: Is 5 valve better than 4 valve?
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justcallmefrank | Tue, 31 May 2005 02:07 |
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Re: Is 5 valve better than 4 valve?
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takai | Tue, 31 May 2005 00:26 |
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Re: Is 5 valve better than 4 valve?
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Ben Wilson | Tue, 31 May 2005 01:02 |
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Re: Is 5 valve better than 4 valve?
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takai | Tue, 31 May 2005 01:04 |
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Re: Is 5 valve better than 4 valve?
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THE WITZL | Tue, 31 May 2005 07:41 |
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Re: Is 5 valve better than 4 valve?
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Jonny2TG | Tue, 31 May 2005 08:23 |
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Re: Is 5 valve better than 4 valve?
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170bhp | Tue, 31 May 2005 11:40 |
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Re: Is 5 valve better than 4 valve?
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Bill Sherwood | Tue, 31 May 2005 11:56 |
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Re: Is 5 valve better than 4 valve?
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Merudo | Tue, 31 May 2005 11:57 |
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Re: Is 5 valve better than 4 valve?
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xolent | Tue, 31 May 2005 12:17 |
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Re: Is 5 valve better than 4 valve?
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170bhp | Tue, 31 May 2005 12:25 |
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Re: Is 5 valve better than 4 valve?
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Bill Sherwood | Tue, 31 May 2005 12:43 |
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Re: Is 5 valve better than 4 valve?
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170bhp | Tue, 31 May 2005 12:34 |
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Re: Is 5 valve better than 4 valve?
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Bill Sherwood | Tue, 31 May 2005 12:57 |
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Re: Is 5 valve better than 4 valve?
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takai | Tue, 31 May 2005 13:13 |
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Re: Is 5 valve better than 4 valve?
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funkdoc | Wed, 01 June 2005 12:41 |
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Re: Is 5 valve better than 4 valve?
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Bill Sherwood | Wed, 01 June 2005 14:04 |
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Re: Is 5 valve better than 4 valve?
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emmac | Wed, 01 June 2005 14:45 |
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Re: Is 5 valve better than 4 valve?
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rx-3 ip | Sat, 04 June 2005 06:26 |
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Re: Is 5 valve better than 4 valve?
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170bhp | Sun, 05 June 2005 13:15 |
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Re: Is 5 valve better than 4 valve?
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Bill Sherwood | Sun, 05 June 2005 13:47 |
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Re: Is 5 valve better than 4 valve?
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Kr0n1k | Sun, 05 June 2005 17:34 |
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Re: Is 5 valve better than 4 valve?
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170bhp | Sun, 05 June 2005 22:28 |
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Re: Is 5 valve better than 4 valve?
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EMP-2TG | Sun, 05 June 2005 23:50 |
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Re: Is 5 valve better than 4 valve?
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off-road | Sun, 05 June 2005 23:34 |
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Re: Is 5 valve better than 4 valve?
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Bill Sherwood | Sun, 05 June 2005 23:40 |
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Re: Is 5 valve better than 4 valve?
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jkvsnn | Tue, 07 June 2005 03:19 |
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Re: Is 5 valve better than 4 valve?
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Bill Sherwood | Tue, 07 June 2005 03:34 |
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Re: Is 5 valve better than 4 valve?
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Bill Sherwood | Sun, 05 June 2005 23:44 |
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Re: Is 5 valve better than 4 valve?
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SEXY 16 | Mon, 06 June 2005 01:00 |
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Re: Is 5 valve better than 4 valve?
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oldcorollas | Mon, 06 June 2005 02:01 |
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Re: Is 5 valve better than 4 valve?
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off-road | Mon, 06 June 2005 02:40 |
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Re: Is 5 valve better than 4 valve?
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Bill Sherwood | Mon, 06 June 2005 04:02 |
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Re: Is 5 valve better than 4 valve?
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oldcorollas | Mon, 06 June 2005 07:04 |
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Re: Is 5 valve better than 4 valve?
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*rivmasta* | Mon, 06 June 2005 07:29 |
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Re: Is 5 valve better than 4 valve?
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*rivmasta* | Mon, 06 June 2005 07:32 |
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Re: Is 5 valve better than 4 valve?
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Bill Sherwood | Mon, 06 June 2005 08:14 |
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Re: Is 5 valve better than 4 valve?
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takai | Mon, 06 June 2005 09:06 |
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Re: Is 5 valve better than 4 valve?
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4agte | Mon, 06 June 2005 09:11 |
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Re: Is 5 valve better than 4 valve?
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takai | Mon, 06 June 2005 11:38 |
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Re: Is 5 valve better than 4 valve?
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Bobski | Mon, 06 June 2005 16:41 |
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Re: Is 5 valve better than 4 valve?
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Blown86 | Mon, 06 June 2005 23:30 |
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Re: Is 5 valve better than 4 valve?
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Corona RT142 | Mon, 06 June 2005 23:31 |
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Re: Is 5 valve better than 4 valve?
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adamaw11 | Tue, 07 June 2005 01:26 |
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Re: Is 5 valve better than 4 valve?
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Bill Sherwood | Tue, 07 June 2005 02:54 |
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Re: Is 5 valve better than 4 valve?
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shinybluesteel | Tue, 07 June 2005 03:03 |
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Re: Is 5 valve better than 4 valve?
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lumpy | Tue, 07 June 2005 05:52 |
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Re: Is 5 valve better than 4 valve?
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oldcorollas | Fri, 10 June 2005 01:50 |
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Re: Is 5 valve better than 4 valve?
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TheStitt | Wed, 08 June 2005 06:24 |
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Re: Is 5 valve better than 4 valve?
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510rob | Thu, 09 June 2005 19:48 |
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Re: Is 5 valve better than 4 valve?
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takai | Fri, 10 June 2005 04:23 |
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Re: Is 5 valve better than 4 valve?
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oldcorollas | Fri, 10 June 2005 04:57 |
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Re: Is 5 valve better than 4 valve?
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Mr Revhead | Fri, 10 June 2005 05:49 |
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Re: Is 5 valve better than 4 valve?
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oldcorollas | Fri, 10 June 2005 06:21 |
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Re: Is 5 valve better than 4 valve?
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Mr Revhead | Fri, 10 June 2005 07:02 |
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Re: Is 5 valve better than 4 valve?
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oldcorollas | Fri, 10 June 2005 07:24 |
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