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Location:
Rocklea qld
Registered:
February 2003
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Re: compression...how low is to low (boosted engine)
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Sat, 05 March 2005 12:06
 
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[quote title=Steve M wrote on Sat, 05 March 2005 03:08]Yeah, I was speaking to a well respected engine tuner about the same thing, he said that 7:1 is very seventies. The engine is pretty flat until the boost comes on really hard, then it's time to change gears.
You won't get anywhere near the linear curve that makes for the best drivability.
If you want a really good kick in the back, low compression will do it for you.
I have run some figures for you through the "Compression ration calculator".
Note, this quite theoretical, but takes into account head cc's (72ml), head gasket dimensions to suit pistons and deck clearance (piston distance below deck)
88.5 bore = 7.085:1 with 18RC pistons.
89 bore = 7.15:1 with 18RC pistons.
92 bore = 7.19:1 with $600 Forged VW 311 Bigbore (non stroker)
90.5 bore = 7.05:1 with $600 Forged VW 331 Bigbore (non stroker)
so can u use the same calculater to figure what the compression will be with a 88.5mm bore and include a 2mm head gasket...
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| | Subject | Poster | Date |
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compression...how low is to low (boosted engine)
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people100 | Wed, 02 March 2005 10:49 |
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Re: compression...how low is to low (boosted engine)
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4agte | Wed, 02 March 2005 10:53 |
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Re: compression...how low is to low (boosted engine)
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people100 | Wed, 02 March 2005 11:18 |
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Re: compression...how low is to low (boosted engine)
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4agte | Wed, 02 March 2005 11:37 |
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Re: compression...how low is to low (boosted engine)
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thechuckster | Wed, 02 March 2005 12:43 |
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Re: compression...how low is to low (boosted engine)
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4agte | Thu, 03 March 2005 08:14 |
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Re: compression...how low is to low (boosted engine)
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thechuckster | Fri, 04 March 2005 06:31 |
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Re: compression...how low is to low (boosted engine)
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4agte | Fri, 04 March 2005 07:16 |
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Re: compression...how low is to low (boosted engine)
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Cool1 | Wed, 02 March 2005 12:48 |
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Re: compression...how low is to low (boosted engine)
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people100 | Thu, 03 March 2005 07:41 |
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Re: compression...how low is to low (boosted engine)
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Norbie | Thu, 03 March 2005 11:21 |
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Re: compression...how low is to low (boosted engine)
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THE WITZL | Thu, 03 March 2005 23:24 |
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Re: compression...how low is to low (boosted engine)
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Mr DOHC | Fri, 04 March 2005 06:22 |
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Re: compression...how low is to low (boosted engine)
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oldcorollas | Fri, 04 March 2005 07:39 |
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Re: compression...how low is to low (boosted engine)
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YelloRolla | Fri, 04 March 2005 08:51 |
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Re: compression...how low is to low (boosted engine)
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people100 | Fri, 04 March 2005 09:48 |
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Re: compression...how low is to low (boosted engine)
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sideshow | Fri, 04 March 2005 11:43 |
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Re: compression...how low is to low (boosted engine)
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Norbie | Fri, 04 March 2005 15:19 |
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Re: compression...how low is to low (boosted engine)
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fatmr2 | Fri, 04 March 2005 21:15 |
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Re: compression...how low is to low (boosted engine)
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4agte | Sun, 06 March 2005 08:12 |
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Re: compression...how low is to low (boosted engine)
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Steve M | Sat, 05 March 2005 00:08 |
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Re: compression...how low is to low (boosted engine)
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people100 | Sat, 05 March 2005 11:09 |
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Re: compression...how low is to low (boosted engine)
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people100 | Sat, 05 March 2005 12:06 |
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Re: compression...how low is to low (boosted engine)
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MS-75 | Sat, 05 March 2005 11:57 |
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Re: compression...how low is to low (boosted engine)
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YelloRolla | Sun, 06 March 2005 06:54 |
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Re: compression...how low is to low (boosted engine)
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people100 | Sun, 06 March 2005 09:44 |
