Building a Flow bench

[Kris Weldy]

O my goodness, not to offend you but he runs a machine shop off of carrol
street here in Ft worth-and that guy couldnt be more full of
himself-honestly.One method of his that sticks to mind is the primer grey
finish on valves sold to customers and advertised as ceramic coat-when in
fact it was primer coat.Man that customer of ours was pissed!
Do yourself a favor and steer clear of his money making antics,its all pure
bs.Have seen one of his heads compared to jg heads at Bob Norwoods autocraft
which by the way built kenny tarns motor this year(yeah kind of funny isnt
it) and the jg head far exceeded that of endynes.Theres a reason why kenny
tran isnt running the endyne-believe me.
But ya know this was just thru the grapevine-dont believe me-research
yourself but i didnt tell you.Automotive machine is what the machine shop is
called and he basically is running the circus over there-mind you -it is a
circus.Catch windmere over there-and one can see what i speak of. Also note
video clip of his so called 12 second car-kind of funny that my buddies type
r accelerates and stops quicker(mildly stock) than windmeres car can
accelerate -we timed it with a stopwatch just to alleviate our minds since
we had much of nothing else to do at the time because we were so furious
that everyone believed his crazy non founded antics.Oh and ask to see his
shop-yeah he doesnt have one-automotive machine isnt his but the ring
leader-and he still ports heads in his garage in his spare time-nothing
wrong with that-but id hesitate to advertise a bunch of nascar bs background
that simply is false,however i challenge anyone to prove me and my freinds
otherwise,we would love to believe he isnt a total farce out for a quick
buck....Being local to this farce has its advantages,and i wouldnt say this
about someone unless i was confident that i stand behind a ton of prove and
would risk my personal character  to steer people away from something that
just doesnt sit right at all with me-customers getting jipped!



-remaining annon..
or something
yeah right.

----- Original Message -----
From: "efi_student" <efi.student at sbcglobal.net>
To: <diy_efi at diy-efi.org>
Sent: Saturday, February 02, 2002 3:28 AM
Subject: RE: Building a Flow bench


> Have you seen any of Larry Widmer's work?  His exhaust ports are
> trans-sonic for just that reason.  Check out:
>
> http://www.theoldone.com/articles/The_Soft_Head_1999/
>
> The site also has references to a couple of articles in Hot Rod and
> Circle Track in the mid 80's.  Lots of interesting concepts discussed on
> the site, and of course Widmer is very opinionated.  That alone makes
> for interesting reading, but he does have some pretty big time
> competitors on his product resume.  I just wish he wasn't completely
> focused on Hondas.
>
> Lance
>
> -----Original Message-----
> From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org] On
> Behalf Of Greg Hermann
> Sent: Friday, February 01, 2002 7:41 PM
> To: diy_efi at diy-efi.org
> Subject: Re: Building a Flow bench
>
>
> At 1:45 PM 2/1/02, steve ravet wrote:
> >Greg Hermann wrote:
> >> If you want to do "off-standard" testing, fine. I was just outlining
> >> what would be needed to do _repeatable_ work, on standard.
> >
> >One question from someone who obviously isn't an ME:
> >
> >Measuring flow at a lower pressure ratio may not be comparable to
> >published numbers but is it useful for relative comparisons?  When
> >porting or whatever could you do something that would improve your flow
>
> >on the bench but be ineffective or actually worse on the car?
>
> It's OK, up to a point. I don't KNOW for sure, but I suspect that the
> two standard numbers (25 and 28 inches of H2O) evolved because
> somewhere, sometime somebody figured out that that is about how much
> pressure drop there is across a typical intake port under maximum HP
> flow conditions.
>
> Why would it be important?? Because comparable pressure drop to
> operating conditions would mean testing at comparable velocities.
> Scaling back the pressure drop (and therefore the velocity) for testing
> would be sort of OK, to a point--BUT--when things like flow separation
> start to raise their head, low velocity testing wouldn't correlate very
> well at all to high velocity testing.
>
> And--flow separation downstream of the short side radius in an intake
> port IS a _BIG_ deal in the real world!
>
> As for testing exhaust ports on a flow bench--it can help marginally,
> but unless you're in a position to test the exhaust ports with choked
> (sonic) flow at or just downstream of the valve curtain area, at low
> valve lifts, you're really NOT going to be looking at the most
> significant flow regime which occurs in an exhaust port (during
> blowdown) ! (HI Dave!!)
>
> Would REALLY be fascinating to see what would happen if somebody were to
> figure out a way to work a convergent--divergent nozzle into an exhaust
> port--so that the first pulse of flow down a header tube would be
> trans-sonic !!! _THAT_ would make for some serious scavenging pulses !
>
> Greg
> >
> >--steve
> >
> >--
> >Steve Ravet
> >steve.ravet at arm.com
> >ARM,Inc.
> >www.arm.com
> >
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