flow bench testing
#1
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flow bench testing
Videos of flow bench testing the cylinder head for the track car….
Not a lot of ‘action’ but it is fun to see some of the numbers!
The flow bench is a computer controlled set up – you program the valve openings you want tested and it will actuate the valve, wait for the flow to stabilize and then it records the flow and moves on to the next step. I measure every .050” of lift….it takes a while!
I had to 'whip up' the aluminum bridge that keeps both valves opengien at the same lift.
http://www.youtube.com/watch?v=SKegh5nRi-o
http://www.youtube.com/watch?v=sHT7YJdYOlI
Not a lot of ‘action’ but it is fun to see some of the numbers!
The flow bench is a computer controlled set up – you program the valve openings you want tested and it will actuate the valve, wait for the flow to stabilize and then it records the flow and moves on to the next step. I measure every .050” of lift….it takes a while!
I had to 'whip up' the aluminum bridge that keeps both valves opengien at the same lift.
http://www.youtube.com/watch?v=SKegh5nRi-o
http://www.youtube.com/watch?v=sHT7YJdYOlI
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#5
Just don't let the ASPCA find out that you shaved the Hampsters first for less air interference.
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#9
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Videos of flow bench testing the cylinder head for the track car….
Not a lot of ‘action’ but it is fun to see some of the numbers!
The flow bench is a computer controlled set up – you program the valve openings you want tested and it will actuate the valve, wait for the flow to stabilize and then it records the flow and moves on to the next step. I measure every .050” of lift….it takes a while!
I had to 'whip up' the aluminum bridge that keeps both valves opengien at the same lift.
http://www.youtube.com/watch?v=SKegh5nRi-o
http://www.youtube.com/watch?v=sHT7YJdYOlI
Not a lot of ‘action’ but it is fun to see some of the numbers!
The flow bench is a computer controlled set up – you program the valve openings you want tested and it will actuate the valve, wait for the flow to stabilize and then it records the flow and moves on to the next step. I measure every .050” of lift….it takes a while!
I had to 'whip up' the aluminum bridge that keeps both valves opengien at the same lift.
http://www.youtube.com/watch?v=SKegh5nRi-o
http://www.youtube.com/watch?v=sHT7YJdYOlI
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28" on that test (the 'depression' is also programmable) - it was also quite warm , the correct flow was 335.3cfm @ .455. I ran a test at 25" later to see the difference - noticble but not very significant.
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The computerize system is really pretty slick – it makes the tests very repeatable. The blue ‘support’ under the head has interchangeable diameter cylinders so you are testing the head in a cylinder similar to the engine block to take any valve shrouding into account.
#13
for repeatable comparative flow testing all you need is 2 vacuum cleaners some clear tube and a hole in the bench . its the ten cylinder heads you destroy figuring out what works thats expensive .
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Nice stuff to watch. Do you have numbers for a stock 8v head Chris?
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Some other tidbits –
Flow volume does not tell you velocity
Pressure drop does not tell you volume or velocity
Nothing tells you swirl except a swirl testing device
The ‘hole’ in the bench is fairly critical - it needs to be a decent length to get the air flow undisturbed. It needs to be the same diameter as the engine cylinder to mimic the flow at the valve head.
All that being said – you can measure improvements with a fairly basic set up.
And yes, if you really want to figure out head flow you will trash a lot of cylinder heads! Even the best head guys cannot tell you exactly what you need to do without trying and most will not even make a comment on work without testing it. If I look at a head I can tell you if the head work is bad – but I would have to flow it to tell you if it is really good.