Flowing at high depressions

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Flowing at high depressions

Postby axegrinder » Wed Sep 29, 2010 2:06 pm

Has anybody personally found significant gains by flowing way up high? Im talkin race heads. Ive seen heads that were only fair at 28" out perform better flowing heads, but at 40" the better flowing heads started to fall off. My bench didnt have the balls to go any higher but it makes me wonder if the "good heads at 28 inches" didnt take a big sh*t at 60 or 80 inches.

Or can you guys usually catch a problem head by probing it and a monster bench isnt always needed?

thanks
Denis
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Postby airflowdevelop » Wed Sep 29, 2010 2:56 pm

I won't live without big depression anymore!!!! What I find is if it is going to have a problem... it is going to have a problem by 60" most of the time.
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Postby Chad Speier » Wed Sep 29, 2010 3:49 pm

I've always done it in the past like this. However, just recently I've started to understand what I was seeing and how to correct it. What is, what could be a potential problem.

Right Dennis! :D
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Postby buschracing » Tue Oct 12, 2010 11:16 am

my 600 bench will go to about 40" on most heads, but that doesnt seem like enough to ever throw a head into a fit. i think you need 60" to see that happen.
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Postby shawn » Thu Oct 14, 2010 10:10 pm

I built my bench around the idea of being able to flowing at big depression. Yes, I believe there is gains there. Heck, I've seen gains there. Funny thing is it's one of those tools that help you find what your doing wrong, then you recognize what wrong is and most of the time you can fix it before you need to find it again. Ha! I think that's what Chad said.
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Postby BH » Sun Oct 24, 2010 12:44 pm

May I ask what motors an flow benchs your using to get more than 40 inches ?
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Postby maxpower671 » Mon Oct 25, 2010 10:39 pm

seems like 28" is the standard depression, but...... what do you think is a more accurate depression level that a running engine would see.. :?:
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Postby SStrokerAce » Wed Oct 27, 2010 3:43 pm

maxpower671 wrote:seems like 28" is the standard depression, but...... what do you think is a more accurate depression level that a running engine would see.. :?:


How hard are you turning it and how small is the head? The biggest depressions are when the head is being used very hard....

Usually the big cause of high depression in a running motor is too little CSA, then again it's also the cause of high local velocities on a bench.

Bret
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Postby airflowdevelop » Fri Oct 29, 2010 8:26 pm

BH wrote:May I ask what motors an flow benchs your using to get more than 40 inches ?


well...that is kind of a touchy subject. I use lamb 115923's.


I will give you a hint...the magic is in the brushes and armature.... and one hell of an electric bill.
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Postby BH » Sat Oct 30, 2010 2:27 pm

Thank you.
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Postby Blue Oval Ralph » Sat Oct 30, 2010 2:49 pm

WEill these fit in a Super Flow 600 with out rewiring the bench and do they have to be rtv in plave with the seting fixture?
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Postby shawn » Mon Nov 01, 2010 8:04 pm

May I ask what motors an flow benchs your using to get more than 40 inches ?


I'm using a self contained centrifugal blower and 15hp three phase motor made by a company called Sonic Air Systems. Here's a link to their site-

http://www.sonicairsystems.com/product- ... rs.php#100


seems like 28" is the standard depression, but...... what do you think is a more accurate depression level that a running engine would see..


Depending on the application and who you talk to, the numbers at seem to be thrown around are 100-120".

shawn[/i]
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