NHRA 2020 Rule Amendment SS Intakes???

[Mike Voth]

Welp, looks like 2020 will be the final year for us!

[bykr]

Correct me if I'm wrong but if you angle mill the head at an extreme angle thereby reducing the port volume and NHRA only measures the head port volume aren't these "spacers" allowing larger cylinder head port volumes? It's not really about adapting different intakes but using the "spacer" to raise cylinder head port volume as the head isn't measured with the spacer installed. I guess the port entry can be raised also. Seems like a reasonable rule change to me. Although I feel for those affected, anytime you push the rules you put yourself in a position to have the rules get tightened, not in you favor whether it's been accepted before or not.

[SSDiv6]

Originally Posted by bykr

Correct me if I'm wrong but if you angle mill the head at an extreme angle thereby reducing the port volume and NHRA only measures the head port volume aren't these "spacers" allowing larger cylinder head port volumes? It's not really about adapting different intakes but using the "spacer" to raise cylinder head port volume as the head isn't measured with the spacer installed. I guess the port entry can be raised also. Seems like a reasonable rule change to me. Although I feel for those affected, anytime you push the rules you put yourself in a position to have the rules get tightened, not in you favor whether it's been accepted before or not.

The volumes are measured without the adapters.

[Mark Yacavone]

Originally Posted by SSDiv6

The volumes are measured without the adapters.

Thanks , Joe
(123 posts later ;-) )

[Sean Cour]

I wonder if exhaust adaptors will be illegal too? I mean, the angle should be checked on the exhaust side, if the intake rule gets reinstated!

[bykr]

Originally Posted by SSDiv6

The volumes are measured without the adapters.

That's my point. If you mill the head at a severe angle won't the cc's of the cylinder head runner be reduced? You can then open the runner up in other areas to bring the head back spec. cc's. The whole point of doing it.

[Bobby DiDomenico]

Originally Posted by bykr

That's my point. If you mill the head at a severe angle won't the cc's of the cylinder head runner be reduced? You can then open the runner up in other areas to bring the head back spec. cc's. The whole point of doing it.

That's what I thought. Besides a better intake you're gaining CC's to work with and possibly changing the entry angle somewhat.

[Mike Gray]

Originally Posted by bykr

That's my point. If you mill the head at a severe angle won't the cc's of the cylinder head runner be reduced? You can then open the runner up in other areas to bring the head back spec. cc's. The whole point of doing it.

I don't understand the problem if porting, polishing, welding and epoxying is already permitted?
From rule book SS heads -
Must be correct casting number for year and horsepower claimed, per NHRA Technical Bulletins or NHRA-accepted. Cylinder-head casting must also be on NHRA runner volume list as published on NHRARacer.com. Porting, polishing, welding, epoxying, and acid-porting permitted.

[bykr]

Originally Posted by Mike Gray

I don't understand the problem if porting, polishing, welding and epoxying is already permitted?
From rule book SS heads -
Must be correct casting number for year and horsepower claimed, per NHRA Technical Bulletins or NHRA-accepted. Cylinder-head casting must also be on NHRA runner volume list as published on NHRARacer.com. Porting, polishing, welding, epoxying, and acid-porting permitted.

Look at it this way.If a cylinder head had 200 cc port volume and you mill away 20 cc's with this angle milling. You now have a head with 180cc's that you can open up to the 200cc spec. which then could perform like a non angle milled 220cc head. Why else would they do this?

[Sean Cour]

Originally Posted by bykr

look at it this way.if a cylinder head had 200 cc port volume and you mill away 20 cc's with this angle milling. You now have a head with 180cc's that you can open up to the 200cc spec. Which then could perform like a non angle milled 220cc head. Why else would they do this?

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