Here is some info I have found concerning inlet runner design.
Thought it might be of use to someone.
Caculator for runner length.
This is a good read about Bellmouth design (in PDF format).
Cheers.
Inlet runner design info.
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Superscan811
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cheaterparts
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Re: Inlet runner design info.
I had a read scott of the inlet runner and the comps and Phill Irvings old comp of 90"/the revs works out very close
Ie say for 6000 revs --- 90/6 = 15" ( 15 x 2.54 = 38.1 cm )
and the calc you posted had much the same lenth at second pulse of cause this is only a starting point
as both dont calc for runner taper or port taper or cam profile or where the cam is dialed in
as for the bell mouth paper I've down loaded it for a read latter
cheater
Ie say for 6000 revs --- 90/6 = 15" ( 15 x 2.54 = 38.1 cm )
and the calc you posted had much the same lenth at second pulse of cause this is only a starting point
as both dont calc for runner taper or port taper or cam profile or where the cam is dialed in
as for the bell mouth paper I've down loaded it for a read latter
cheater
cheater
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Rallyant
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- Location: Ringwood, Melbourne, (Newport Syd atm) & Seychelles
- Contact:
Re: Inlet runner design info.
I know I have posted it before, But this site gives calcs that take cam timing into consideration
http://www.grapeaperacing.com/tech/inductionsystems.pdf
But the Engine analyzer software i have played around with gives better power and torque curves with runners at diferent length to my manual calculations.
Dont know what to go with?
The bellmouth PDF is interesting, I need to finish reading it still tho! I have Flow testing FEA software that ill try some of that info with, see if I get the same results.
http://www.grapeaperacing.com/tech/inductionsystems.pdf
But the Engine analyzer software i have played around with gives better power and torque curves with runners at diferent length to my manual calculations.
Dont know what to go with?
The bellmouth PDF is interesting, I need to finish reading it still tho! I have Flow testing FEA software that ill try some of that info with, see if I get the same results.