Intake manifold flow test. Interesting read!
- Thread starter toolmanmike
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340doc
Well-Known Member
Interesting, glad to see the old LD hanging in there.
perfacar
Well-Known Member
when we tested intakes, mounted them port to bench. sucked air through the carb entrance, like it does on engine. they mounted theirs upside down, sucked air through port. backwards of natural flow. one time tested intake port, with port face down on bench . blew air through port. was testing swirl at chamber, it didn't flow as much as testing correct method.
The bench puts out pressurized air and not suction correct. It looks like they did it right.
AJ/FormS
68 Formua-S fastback clone 367/A833/GVod/3.55s
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I was digging the numbers too, until I saw their test rig
perfacar
Well-Known Member
the flow bench sucks air on intake, blows air on exh. they have plugs in intake ports. to keep air from sucking through. BTW, I flow test on my superflow 600.
yellow rose
Overnight Sensation
At one time there was some lower end flow benches that only flowed air in one direction. To me, that is useless. You have to be able to get the air going both ways like perfacar says. And his is the correct way to test an intake manifold.
That's why this stuff is so expensive. To test things as correctly as you can takes time, the right tools and the sense to use them. That isn't cheap.
That makes sense.
That article is an oldie and a goodie!
Blue Grey Duster
Well-Known Member
Man! You've got that right.
It;s good to see a Mopar only Tech. Article.
Here's a general one on intake design by Hot Rod.
The Manifold Features Of Intakes - Tech Engine - Circle Track Magazine
And the best flowing intake may not work the best. Good general info, one of the worst ways possible to select an intake for a build.
Old manifold but a good design.
interesting read, but I don't like constant flow. An engine is disrupted flow. On the intake side, it's a quick, big, gulp of air and stop! On the exhaust side, it's a quick, blast of shoved air in "pulse style" with a slamming door shut (valve). Intakes and heads truly need to be bolted on an engine for the ultimate in accuracy.
Never thought of it that way.
spl440
Everybody's Fool
That is why there is two different lengths for the cross ram, low rpm and higher rpm. tuning the intake runner length for the pulse for either high or low rpm.
perfacar
Well-Known Member
tried that thought, had hell of time getting engine set on flow bench. couldn't hook up the bench to intake. gave up on it!! constant flow gives you a measurement of flow. it's accurate. superflow, has a article about that.
spl440
Everybody's Fool
Have seen a 300 six cyl ford set up to run on three cyl and used the other three as a compressor. sounds like an idea to set up a 8 cyl to use as a flow bench for 4 of them.
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