Inlet manifold runner length

[Bruce Plecan]

-----Original Message-----
From: Stuart Bunning <stuart at kenelec.com.au>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Sunday, September 27, 1998 9:54 PM
Subject: Re: Inlet manifold runner length


>
>Thanks Bruce
>But this doesn't help me.
>I have a program called ENGINE ANALYSER that will tell me the runner length
>for whatever application or tell me HP/Tor for different runner lengths but
>my question is where exactly to I measure the runner length. valve to
plenum
>or valve to throttle body ????

Oh, from the edge of the valve seat to the end of the shortest wall.
Bruce
>
>
>
>
>At 08:38 PM 27/9/98 -0400, you wrote:
>>
>>-----Original Message-----
>>From: Stuart Bunning <stuart at kenelec.com.au>
>>To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
>>Date: Sunday, September 27, 1998 8:08 PM
>>Subject: Inlet manifold runner length
>>
>>
>>>I am in the process of making a custom EFI inlet manifold for a straight
>>six.
>>>I will be using a common plenum and a single throttle body or possible
two
>>>throttle bodies not sure yet.
>>>Can anyone tell me the correct way of calculation the inlet runner
length.
>>
>>At the bottom of the DIY_EFI home page is an area for calculations,
>>and one of them is for runner lenghts.
>>>
>>>I assume inlet valve to plenum. Or is it inlet valve to throttle body
this
>>>calculation will add a extra few inches as the plenum is usually a few
>>>inches wide. After the throttle body there will be a length of about 20
>>>inches of ducting to a airbox. I assume this is not relivent.
>>>
>>In some testing I did was best to keep this volume .5 to .75 engine
>>displacement.
>>Bruce
>>
>>
>
>
>Best Regards,
>
>STUART BUNNING
>SALES ENGINEER
>KENELEC PTY LTD
>
>23-25 REDLAND DRIVE
>MITCHAM VICTORIA 3132
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>
>PHONE:  61 3 9873 1022
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>EMAIL:  stuart at kenelec.com.au
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>
>