Northy
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| posted on 15/7/03 at 05:52 PM |
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Inlet manifold, theory?
Hi everyone,
I've got to make an inlet manifold for my engine because i can't get one to fit under the bonnet. Does anyone know any theory of manifold
design, or any resourses on 'tinternet?
I did find this:
"If you are going for top end power then the short manifold is the way to go, the longer manifold gives you a better mid range of power loosing
out a bit at the top end. So the choice is limited. If you wanted more top speed you would use a shorter manifold , and a longer manifold for maximum
torque. Also the straighter the manifold the better."
Cheers
Graham
Website under construction. Help greatfully received as I don't really know what I'm doing! 
"If a man says something in the woods and there are no women there, is he still wrong?"
Built 2L 8 Valve Vx Powered Avon
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Findlay234
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| posted on 15/7/03 at 08:14 PM |
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No its a little bit more invlolved than that, you set the optimum length to the revs you want to gain most power from. then you have to match the cams
and exhaust etc to gain the most. I know an excelent website and ill post it here as soon as i find it.
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Findlay234
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| posted on 15/7/03 at 08:27 PM |
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Heres what i was looking for, if you look down for my posts.... the first one gives a poor and simple description of tuned intake lengths and the
theory. My next post after that has a link to another site which gives it in much more detail. thats really where you want to look. The maths is
involving and if you need a hand then im sure therell be someone on here wholl help, i just about get the maths.
As you can see theres more to it than simply short manifold and long manifold, the F1 guys do it to within mm tolerences to give the greatest
boost.
http://forum.locostbuilders.co.uk/xmb/viewthread.php?tid=3394
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Mark Allanson
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| posted on 15/7/03 at 08:28 PM |
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Total ram length (inches) fron the lip of the ram pipe to the lip of the inlet valve = 228 x Inlet timing in degrees divided by the max power RPM
minus 500
Piper tuning manual
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