Intake Runner Length

[Bruce Plecan]

-----Original Message-----
From: ECMnut at aol.com <ECMnut at aol.com>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Thursday, February 04, 1999 1:27 PM
Subject: Re: Intake Runner Length

Dog leg ports, ain't bad.
The best head on our tractor has a big dog leg in them.  This is on a direct
injection engine (fuel shoot in cylinder), and it realllllyyyyyyyyy works.
There are soo many wife's tales, rumors,and lies about port shapes.

The other day I mentioned Yates probably being over the 85% number.
Looks like he might be at 91%.

Bruce      Doc is on a exercise program......
              Beating his head against a wall is 150 calories per
hour.......


>This is not making sense.  The "corkscrew" ports on the intake side of
>my Syclone's votec heads are generally considered to be bad.
>The faster guys use the earlier 229 (regular intake port),
>or the bowtie heads, which don't use that vortec crap..
> It seems to be good at making low to midrange torque
>with surprisingly little spark advance, but useless for
>big flow or high RPM...  any thought would be appreciated.
>MNike V
>
>>Exactly right!  We have been playing around with different porting schemes
>>and found that you don't want the air to tumble in around the valve,
>>instead, if you can make it swirl in (Vortec's idea?) you can get a lot
more
>>in.  "Some" drag-racers claim that you want the swirl to go ccw also.
(Why,
>>and for what purpose? I can't imagine).  We haven't got to playing with
>