[pastry_chef]

Originally Posted by Steve C.

The JKM uses an averaging velocity tube to measure flow.

If it gave me values 25 to 30 CFM different than a Superflow.. I'd toss it in the trash.

[Stan Weiss]

Originally Posted by pastry_chef

If it gave me values 25 to 30 CFM different than a Superflow.. I'd toss it in the trash.

Mike,
Two people with the same make flow bench can get different result just by using a different radius on the outside of the intake port.

Stan

[Steve C.]

I've seen the statements a flow bench is only a tool.

Googled up.... "One of the primary tools of high performance engine builders, and porting cylinder heads would be strictly hit or miss without it".

Years ago David Vizard when he tested a cylinder head for me suggest it. At the time he used a Quadrant Scientific Flowlab 520 bench. Another type and It was a laminar flow orifices. Different benches, different methods.

Here, I'll muddy the topic a bit more.... one flow bench was equipped with a bird nest that altered the results
Anyone here want to quess, or know, what 'famous' published testing of Pontiac cylinder heads was done on that bench ?

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[pastry_chef]

Originally Posted by Stan Weiss

Mike,
Two people with the same make flow bench can get different result just by using a different radius on the outside of the intake port.

Stan

Yes but I haven't seen anyone say 30 CFM discrepancy for a "calibrated bench".

Chad Speier claims other porters Dennis Wheet, Darin Mogan, Scott Parks are within 3 CFM of his results for the same port. I trust Chad.

[Stan Weiss]

If you look at this video you will see there is a Super Flow bench in David's shop. I am not sure what else he has. I do know that before coronavirus made David get super busy with work that he was building a new much larger flow bench.

Flowbench Testing using David Vizard's IOP program

https://www.youtube.com/watch?v=WtDq5UiVCBk

Stan

[Stan Weiss]

Originally Posted by pastry_chef

Yes but I haven't seen anyone say 30 CFM discrepancy for a "calibrated bench".

Chad Speier claims other porters Dennis Wheet, Darin Mogan, Scott Parks are within 3 CFM of his results for the same port. I trust Chad.

I don't remember the details, but I do remember when the SF1020? came out and people were not getting the same results as they had been getting from their SF600.

Stan

[Steve C.]

Stan, David Vizard over the years has conducted business at different locations with different flow benches. At one time in Tucson Arizona, I believe that is where he conducted his work for K&N filters. His flow bench testing on my Edelbrock cylinder head was done while he was in Riverside California, associated with Advanced Performance Technology. Later I think he moved to North Carolina to do more work with NASCAR.


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[Stan Weiss]

Originally Posted by Steve C.

Stan, David Vizard over the years has conducted business at different locations with different flow benches. At one time in Tucson Arizona, I believe that is where he conducted his work for K&N filters. His flow bench testing on my Edelbrock cylinder head was done while he was in Riverside California, associated with Advanced Performance Technology. Later I think he moved to North Carolina to do more work with NASCAR.


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Steve,
David Vizard has been in the Charlotte area for a good number of years now. Was your Edelbrock done when David Vizard was in business with David Anton?

Stan

[Steve C.]

"Was your Edelbrock done when David Vizard was in business with David Anton?"

Yes in Feb 1999 at Advanced Performance Technology. It was a prototype Edelbrock cylinder head that never saw service.

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[steve25]

When DV had his 520 bench the flow numbers that it spit out, especially on the intake side where quite different then those same head flow results I got on my Superflow bench and also as I searched and found with other Superflow benches, and I am not just talking about Pontiac heads here!

The start of my questioning DV 520 bench numbers was when Steve Dulcich was doing a flow test of and a porting series on Mopar heads for the mag he wrote for at that time, and he was using Divid’s 520 bench to do them on.

I at the time was porting two different sets of iron Mopar castings and the flow numbers where just not close to jiving to me.

The first warning sign that something was up with the numbers produced by David’s bench was when Steve tested the intakebside of a iron BBC oval port head on it and then listed in one of the articles that it’s peak flow was only 221 cfm@ .600” lift, but this is not what they flow, they flow in the 260 cfm range which is a big difference!
I can see why David no longer has that bench!

The following picture is of a perfectly streamlined inlet I made for my flow bench a number of years ago to test out how much air flow you could possibly get thru a standard Pontiac intake D port gasket area .

The max flow numbers that I recorded of 292 cfm clearly show that Pontiacs intake ports needing to flow that number or greater will need to at least be of RA4 size.

[MidnightAuto]

I just got these 290 kre. (Sorry about shadow, not at home to take another pic). Came with raiv gasket.

[Steve C.]

"Quadrant Scientific has been out of business for more than 15 years and documentation is scarce. Even "creative" Google searches don't return much more than a few pics. I recall some flow testing done by David Vizard & Steve Dulcich for a Mopar magazine in the '90s using this type of bench."

"I'm unable to find out much else about the FlowLab 520 other than it requires a 220v power source and uses an LFE (Laminar Flow Element) for airflow measurement. Does anyone here know any details about this bench, such as the amps required to run it, whether they were known to have reliability issues, or ???"

Thanks! - Brad

"Brad, I still have that bench.

I don't know I can be of much use here other than the bench can be made to do stuff that is inconvenient on a Super Flow."

"When they are working it is a nice piece but when they go wrong you had better be creative if you want it running again."
David Vizard
2016

https://www.speed-talk.com/forum/viewtopic.php?t=47818

A flow bench is a tool.


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[Stan Weiss]

The owner of Quadrant Scientific and David were friends. Unless I am think of the wrong person he passed away some years ago. Quadrant Scientific also did CAMDR. I don't have a CamDr but still have the software. MSDOS based. lol

Stan

[JLMounce]

Not to derail current discussion, but OP’s heads that he’s working on are absolutely as cast units. The ports look exactly like my as fast KRE D ports.