>
> <snip>
>>
>> Good going Bill. That is just plain great. Here is a tip.
>> The stock RX8 manifold makes 247 HP at 8500 RPM. You will need a bit >> shorter
>> runners to get peak HP at 7500 RPM
> <snip>
>>
>> Paul Lamar


> Shouldn't that be a little longer?
>
> Bob W.



> Could be. Won't know for sure until sombody dynos it.
>

<snip>

>
> Paul Lamar


Bob
Shorter is correct.

<snip>

Ian

<snip>

Hi Ian,

OK,  but maybe you could explain why shorter runners would move the
peak from 8500 to 7500.  It seems counter intuitive to me.

Bob W.

http://www.bob-white.com
N93BD - Rotary Powered BD-4 (real soon)
Prewired EC2 Cables - http://www.roblin-photo.com/shop/

Bob,
Sorry, I got it wrong, misread the statement, the stock Mazda configuration
for high RPM is very short.  From the published data there is no benefit
from manifold tuning at very high RPM.

Ian WA

What published data is that Ian?

Paul Lamar

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