Cc limits

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AMXstocker1
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Cc limits

Post by AMXstocker1 » Tue Jan 30, 2018 9:06 am

Has anyone ever considered that using intake runner cc as a class rule is crazy and would only work if all the competing vehicles used the same engine platform. If not he who has the shortest runner cylinder head wins because they can have a larger average CSA all the class's should be limiting CSA Not CCs it becomes very tempting to start milling the intake side of the head back as far as possible and building a custom intake manifold.

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Re: Cc limits

Post by Krooser » Tue Jan 30, 2018 9:11 am

The ridiculous thing is who is going to tech this stuff?
Last place in the B-main is better than anyplace in the grandstands...

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Re: Cc limits

Post by cgarb » Sat Feb 03, 2018 1:14 am

Restrictor plate racing.

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Re: Cc limits

Post by SupStk » Sat Feb 03, 2018 4:42 pm

NHRA has the maximum intake and exhaust runner CCs and minimum combustion chamber volumes for each head accepted for stock and super stock engines. They DO check 'em.

If the OP is talking about open competition with no engine distinction, the obvious advantage does go to the shortest runner.
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Re: Cc limits

Post by AMXstocker1 » Sat Feb 03, 2018 10:23 pm

yes we run a class with a straight 230cc intake runner volume limit. so he who has the shortest runner wins. sounds like i'm bitching i'm just thinking about it and it seems like saying a max of a 2.30 inch CSA would be easier to check and more effective. NHRA uses supposed factory volumes, but i've heard plenty of griping about bogus cc#s for some combinations over on classracer too.

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Re: Cc limits

Post by miniv8 » Sun Feb 04, 2018 6:34 pm

Have you thought about milling the manifold face of the head?

(edit, but I agree, the rule is kinda stupid..)

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Re: Cc limits

Post by SupStk » Sun Feb 04, 2018 9:15 pm

AMXstocker1 wrote:
Sat Feb 03, 2018 10:23 pm
yes we run a class with a straight 230cc intake runner volume limit. so he who has the shortest runner wins. sounds like i'm bitching i'm just thinking about it and it seems like saying a max of a 2.30 inch CSA would be easier to check and more effective. NHRA uses supposed factory volumes, but i've heard plenty of griping about bogus cc#s for some combinations over on classracer too.
During the 80's NHRA was checking runner volumes, venturi and throttle plate diameters during stock and super stock teardowns. This was before they had to conform to published specs. I wondered at the time what it was all about. In retrospect we know now.
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Re: Cc limits

Post by 6.50camaro » Mon Feb 05, 2018 9:16 am

I my be wrong ,but I think a Ford FE would be a good candidate for this class. Dan

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Re: Cc limits

Post by AMXstocker1 » Mon Feb 05, 2018 8:32 pm

We are milling the manifold face mainly to correct the angle heads are being angle milled rolled over to closer to a 17 degree angle than a 18 so the face will be milled some to correct this. Also the indy head we run have intake surface that is flush with the manifold side of the head were a factory head has a 1/8th inch lip that manifold sets under i think were going to go ahead and take that 1/8th off the heads. Ours are being ported hemi adkins hes a superstock racer from va and these heads will be like a bigger cc version of his SS heads.

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Re: Cc limits

Post by JohnsnsFord2@aol.com » Mon Feb 12, 2018 3:20 am

6.50camaro wrote:
Mon Feb 05, 2018 9:16 am
I my be wrong ,but I think a Ford FE would be a good candidate for this class. Dan
Why do you say this?
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Re: Cc limits

Post by JohnsnsFord2@aol.com » Mon Feb 12, 2018 3:22 am

I think some of the hemi heads are done like this in the AH class...
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Re: Cc limits

Post by pdq67 » Mon Feb 12, 2018 6:09 am

6.50camaro wrote:
Mon Feb 05, 2018 9:16 am
I my be wrong ,but I think a Ford FE would be a good candidate for this class. Dan
Probably because the old FE engines have most of their intake runner lengths in their WIDE intake manifolds is why.

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Re: Cc limits

Post by 6.50camaro » Mon Feb 12, 2018 7:39 am

pdq67 wrote:
Mon Feb 12, 2018 6:09 am
6.50camaro wrote:
Mon Feb 05, 2018 9:16 am
I my be wrong ,but I think a Ford FE would be a good candidate for this class. Dan
Probably because the old FE engines have most of their intake runner lengths in their WIDE intake manifolds is why.

pdq67
Yes ,that is one of the reason . With the new Trick Flow Specialties heads flowing 330+ cfm @175cc seems to me that you could get all the flow you want with out pushing the cc limit . Multiple sizes from 352- 428 if working with lbs /cu.in. rule . Aftermarket stroker parts if working with min. weight/ max cu.in. rules , relatively light engine weight are a couple of the others . I remember back in the mid 70's a guy in the town I grow up in had a 67 cyclone gt that he pulled the 390 out and put in a 428cj . Before the swap he could run pretty close with 440 cudas and 396 chevelles in town. After the swap all they he was the quickest car in town running on the street. Dan

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Re: Cc limits

Post by 6.50camaro » Mon Feb 12, 2018 8:06 am

Correct that , it was a 68 cyclone gt. Dan

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