Ex. Flow rate

Bernie Jacobsen bcjac at ix.netcom.com
Mon Mar 30 21:40:38 GMT 1998


Clive,

What is the correction for temp expansion?

^Bernie




-----Original Message-----
From: Clive Apps Techno-Logicals 416 510 0020 <clive at problem.tantech.com>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Thursday, March 26, 1998 12:52 PM
Subject: Re: Ex. Flow rate


>>
>> >
>> > Slightly off topic, but does anyone know how to calculate (or
approximate)
>> > exhaust volumes, flow rates    knowing RPM and CR.??
>>
>> CR doesnt really matter
>> volume / cyl = 5RPM x VE x displacement x corerection for temp expansion
>
>
>that should have been .5
>>
>> VE can be from .7 up to 1.25 depending on your tuning setup
>> average VE is int the .85 range street car
>> 1-1.1 range well tuned race car
>> 1.2 + range indy/cart/ etc.
>>
>> estimate 11-1200^ ex temp for well tuned street car
>> 13-1400^ for race
>> 13-1700^ for turbo setup
>>
>> optimum is flow rates in the 225 -300 ft/s range
>>
>> calculate flow rates from cyl volume/header volume
>>
>> Clive
>>
>
>




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