MCS Length?

General engine tech -- Drag Racing to Circle Track

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GARY C
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Re: MCS Length?

Post by GARY C » Fri Mar 22, 2019 12:04 am

Epoxy time... Moment of truth, I guess!
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cjperformance
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Re: MCS Length?

Post by cjperformance » Fri Mar 22, 2019 12:31 am

Good work, always great to see experimentation.
Craig.

GARY C
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Re: MCS Length?

Post by GARY C » Fri Mar 22, 2019 12:51 am

cjperformance wrote:
Fri Mar 22, 2019 12:31 am
Good work, always great to see experimentation.
We will see... I always forget how much I hate epox until I have it stuck to everything in site... :)
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GARY C
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Re: MCS Length?

Post by GARY C » Sun Apr 14, 2019 7:15 pm

Brief update on the "I Quit!" project.

No change in CFM or Air Speed with epoxy.
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steve cowan
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Re: MCS Length?

Post by steve cowan » Sun Apr 14, 2019 8:59 pm

Gary,
did you try the intake manifold you are using-before and after?
what test pressure?
steve c

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Re: MCS Length?

Post by GARY C » Sun Apr 14, 2019 11:19 pm

steve cowan wrote:
Sun Apr 14, 2019 8:59 pm
Gary,
did you try the intake manifold you are using-before and after?
what test pressure?
Not sure what intake I am going to use yet, I have several.

Not sure what to look for or what I would do with it, it past test I know peak lift air flow goes down and air speed at the flange goes up and on these heads it is going to kneed epoxy... :)

I have not epoxied the other head yet and I am getting ready to pull an intake off an engine that I will probably use, so I can compare 3 different single planes and 1 Air Gap but since I am not going to dyno different intakes I am not sure it will tell me anything except for cfm and air speed.
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Re: MCS Length?

Post by steve cowan » Mon Apr 15, 2019 1:11 am

Gary,
i have a set of sportsman 2 heads that are a work in progress in spare time.
i found misalignment with the roof of the head and intake (holley strip dominator as cast)
i raised the roof on the head and intake for better transition,i filled the floor of the cylinder head with epoxy and lost flow until i dropped the epoxy floor.pinch is at 2.3''
runner size 195cc,2.02 intake valve @ 86% throat.
intake i raised the roof to match head,epoxy long side at the flange and matched the short side of the runner,this is #1 cylinder long intake runner,just ran the burr over the manifold runner to de-flash.
on the bench it only lost 6cfm @ 0.650'' lift-have not checked air speed yet with intake bolted on.
like i said this a work in progress,hopefully i can get around 280 cfm with a runner size around 195-200cc.
steve c

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Re: MCS Length?

Post by GARY C » Mon Apr 15, 2019 1:55 am

steve cowan wrote:
Mon Apr 15, 2019 1:11 am
Gary,
i have a set of sportsman 2 heads that are a work in progress in spare time.
i found misalignment with the roof of the head and intake (holley strip dominator as cast)
i raised the roof on the head and intake for better transition,i filled the floor of the cylinder head with epoxy and lost flow until i dropped the epoxy floor.pinch is at 2.3''
runner size 195cc,2.02 intake valve @ 86% throat.
intake i raised the roof to match head,epoxy long side at the flange and matched the short side of the runner,this is #1 cylinder long intake runner,just ran the burr over the manifold runner to de-flash.
on the bench it only lost 6cfm @ 0.650'' lift-have not checked air speed yet with intake bolted on.
like i said this a work in progress,hopefully i can get around 280 cfm with a runner size around 195-200cc.
Yes I have done a lot of that on different head and intake combos but I don't have any dyno info before and after to know if I made it better or worse, one I did years ago had the head and intake combo within 3% of the heads alone, the heads flowed 317cfm, after some time talking with Wilson Manifolds head porter it turned out that I probably hurt shift recovery by making it to big.

I normally mock everything up on the block to be used with a .120 trim to fit gasket to raise the intake as much as possible and then raise the head port to match, once I get it mocked up on the engine I am guessing I will be raising these some so I haven't really got to carried away with the entry, I mainly wanted to see if I reduced the opening how it would effect air speed at the pinch and reducing it down to 2.05 at the opening has not hurt on the bench but who knows what it would do on a running engine?

There seems to be a complete disagreement in the industry over what % is needed for throat size and how that differs from say a low port 23* head vs a Highport 18, 15 or 12* type head, so chances are I will be grinding the epoxy out of the throat on this one head and save my self from a ton of possible unnecessary work as well as the possibility of it coming loose and trashing the engine.
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