Intake runner lenght

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Intake runner lenght

Post  Ashburner on August 22nd 2018, 5:19 am

Hello,

we are building our own intake manifold for our 620cui race engine.
It´s going to be something like a stack injection but a bit different than the "normal" stuff.

Can anybody help me to determine the intake runner length? I´ve found different formulas, calculators, etc. but always with a different result.
It´s a struggle Rolling Eyes

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Re: Intake runner lenght

Post  dfree383 on August 22nd 2018, 8:35 am

Ashburner wrote:Hello,

we are building our own intake manifold for our 620cui race engine.
It´s going to be something like a stack injection but a bit different than the "normal" stuff.

Can anybody help me to determine the intake runner length? I´ve found different formulas, calculators, etc. but always with a different result.
It´s a struggle Rolling Eyes

I've used pipemax a few time and the results where real close.
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Re: Intake runner lenght

Post  Curt on August 22nd 2018, 8:49 am

I've never built one, but here is some info from people that do.

http://www.swartzracingmanifolds.com/tech/index.htm
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Re: Intake runner lenght

Post  rmcomprandy on August 22nd 2018, 9:07 am

Ashburner wrote:Hello,

we are building our own intake manifold for our 620cui race engine.
It´s going to be something like a stack injection but a bit different than the "normal" stuff.

Can anybody help me to determine the intake runner length? I´ve found different formulas, calculators, etc. but always with a different result.
It´s a struggle Rolling Eyes

Just be aware that entire runner length is usually measured from the back of the intake valve and this includes the length of the cylinder head intake port. Be aware that runner taper skews the actual intake runner length; more taper acts like a shorter runner.

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