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Location:
Melbourne
Registered:
June 2004
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Re: extractors
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Mon, 20 December 2004 10:17
 
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| oldcorollas wrote on Mon, 20 December 2004 16:43 |
my take on all this is that 4-2-1 will give you better scavengine in mid to high rpm... and 4-1 is for top end.. for me that means if you have a power band _starting_ around 6000rpm, you would only want 4-1. but if you have a power band starting around 4-6000rpm, you would want 4-2-1..
4-1 and 4-2-1 also have different length primaries, so there is more to it than just one or the other, as you can tune 4-1 to work with lower rpm.... thing is, when you have a reflected wave travelling up 4 pipes, it will not be as strong as travelling up two pipes 
Cya, Stewart
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Exactly.
Either type can be tuned for higher or lower RPM by the length of the runners. I guess the harmonics of a 4:1 system are more efficient than 4:2:1 at high RPM. Maybe it's just easier to get bulk-flow through a 4:1 system.
Also, alot of people want to run the stock catalytic convertor, which in most new cars needs to be really close to the engine. That automatically means 4:1 extractors for alot of people, as it can half the distance before you can mount the cat.
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| | Subject | Poster | Date |
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extractors
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Meat_rack | Sun, 19 December 2004 12:35 |
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Re: extractors
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st184 sillycar | Sun, 19 December 2004 22:30 |
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Re: extractors
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jesseT18 | Sun, 19 December 2004 23:35 |
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Re: extractors
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st184 sillycar | Mon, 20 December 2004 01:02 |
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Re: extractors
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CrUZsida | Mon, 20 December 2004 03:52 |
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Re: extractors
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db__ | Mon, 20 December 2004 04:53 |
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Re: extractors
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CrUZsida | Mon, 20 December 2004 04:56 |
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Re: extractors
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oldcorollas | Mon, 20 December 2004 05:43 |
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Re: extractors
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st184 sillycar | Mon, 20 December 2004 10:17 |
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Re: extractors
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riceburna73 | Tue, 21 December 2004 03:22 |
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Re: extractors
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st184 sillycar | Tue, 21 December 2004 07:21 |
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Re: extractors
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cheese_cracka | Tue, 21 December 2004 10:46 |
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Re: extractors
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CrUZsida | Tue, 21 December 2004 11:57 |
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Re: extractors
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cheese_cracka | Tue, 21 December 2004 12:01 |
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Re: extractors
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Meat_rack | Tue, 21 December 2004 12:06 |
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Re: extractors
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CrUZsida | Tue, 21 December 2004 12:32 |
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Re: extractors
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cheese_cracka | Tue, 21 December 2004 13:16 |
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Re: extractors
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oldcorollas | Tue, 21 December 2004 13:22 |
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Re: extractors
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Meat_rack | Tue, 21 December 2004 13:23 |
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Re: extractors
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Meat_rack | Tue, 21 December 2004 13:29 |
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Re: extractors
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oldcorollas | Wed, 22 December 2004 10:33 |
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Re: extractors
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Henn | Wed, 22 December 2004 06:10 |
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Re: extractors
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st184 sillycar | Wed, 22 December 2004 07:08 |
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Re: extractors
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White Rabbit | Tue, 28 December 2004 06:28 |
