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Tractor Pulling Discussion Forum

How do they flowrate head??

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Curious?

01-15-2004 22:14:08




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Hi guys, can anyone tell me how a flowbench works for flowrating cylinder heads?? Is it possible to build a bench? Who sells them?? Any good info is appreciated, thanks guys!!




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G-MAN

01-16-2004 10:40:03




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 Re: How do they flowrate head?? in reply to Curious?, 01-15-2004 22:14:08  
Keep in mind that there are a lot more factors that affect the performance of a head than just flow. A head with super-high flow numbers won't always outperform one with lower numbers. If the ports are enlarged to much, you lose velocity, which hurts cylinder filling and scavenging just as badly as not being able to flow enough. You can also lose the swirl effect, which keeps the fuel-air mixture stirred up and the fuel in suspension.

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TimC

01-16-2004 13:30:57




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 Re: Re: How do they flowrate head?? in reply to G-MAN, 01-16-2004 10:40:03  
Well said. The flow bench should be used to arrive a the correct flow capicity and quality.
Velocity also keeps the fuel suspended. Large ports in relation to bore/stroke will kill torque.



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oh really?

01-17-2004 12:01:50




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 Re: Re: Re: How do they flowrate head?? in reply to TimC, 01-16-2004 13:30:57  
did you reflow the under pressure tractors head? WOW, you did a good job! NOT REALLY! Keep your hands off of it, you got it all messed up! Head boys--CALL DUKE ASAP!!!!!



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TimC

01-16-2004 06:15:56




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 Re: How do they flowrate head?? in reply to Curious?, 01-15-2004 22:14:08  
I would email you drawings and instructions if you could get me your email address.

You can suck or blow depending on intake or exhaust. The pressure differiential is measured thru an inclined manometer. That is percent of flow compaired to the oriface plate rated cfm to give you the flow rate. There is also a u tube manometer which sets the depression. i.e. 28 inch of water column. Fairly easy and straight forward to built and if you are handy at locating parts you could build one for about 200 bucks or at most 600. It would not be as accurate as a SuperFlow but would let you know if you were making changes in the right direction.

Here is another useful site.

http://tractorsport.com/flowbench/

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Curious

01-16-2004 10:34:05




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 Re: Re: How do they flowrate head?? in reply to TimC, 01-16-2004 06:15:56  
Hey Tim, email [email protected], thanks for the advice!



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TimC

01-16-2004 13:49:46




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 Re: Re: Re: How do they flowrate head?? in reply to Curious, 01-16-2004 10:34:05  
Correction, it exceeds the limit you can recieve. I will send them one at a time.



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TimC

01-16-2004 13:47:32




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 Re: Re: Re: How do they flowrate head?? in reply to Curious, 01-16-2004 10:34:05  
Its in your mailbox. It was sent in a zip file. I'm taking for granted you can extract.



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farmall

01-16-2004 05:52:11




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 Re: How do they flowrate head?? in reply to Curious?, 01-15-2004 22:14:08  
Go to www.jamisonequipment.com
They have some nice flow benches.
John Jamison is the owner and can
tell you all about them. Hope this
helps.



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Ken

01-16-2004 05:15:21




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 Re: How do they flowrate head?? in reply to Curious?, 01-15-2004 22:14:08  
I think about a year or 2 ago someone put plans on this post to build one , You might check the
Archives. Ken



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