correke
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| posted on 11/1/05 at 09:20 AM |
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exhaust manifold
I am fabricating a new exhaust manifold for my blackbird powered car. It is going to be a 4 into 1 design for better top speed (worse in lower revs).
Of course Iam trying to get all the 4 pipes exactly the same length. Question is what length from exhaust valves to 4-1 collector.
There should be a formula somewhere
in which this can be calculated so I can be very close to the best length for a certain rpm.
regards Cor
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Alfalfameister
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| posted on 11/1/05 at 09:55 AM |
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This was posted a while back by someone (sorry, can't recall):
I checked my copy of A. Graham Bell's Four Stroke Performance Tuning, and this excel file has the same formulae.
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MikeR
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| posted on 11/1/05 at 11:54 AM |
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looks very much like Mr David Ashursts spreadsheet.
Sure he'll pop by soon and confirm if it is.
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Alfalfameister
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| posted on 11/1/05 at 12:11 PM |
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Ah, yes, that's him! Very useful stuff. Thanks, David!
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Jon Ison
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| posted on 11/1/05 at 02:29 PM |
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ive got std Blackbird 4-1 manifold on mine, around 24/25" from head to collector, i assume Mr Honda got it pretty close.
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