NHRA 2020 Rule Amendment SS Intakes???

[bert powell]

Originally Posted by SSDiv6

Bert,
Do you even know what you are talking about?
Gain 50 to 60 cc's when the rules allow you to port, epoxy and epoxy the cylinder heads?

If the port volume is measured without the spacer, you get to add all the spacer volume into the port. Very simple to understand. Make the rule that the port volume is measured with the spacer and I bet you wont see anymore of them.

[Jeff Niceswanger]

Originally Posted by bert powell

If the port volume is measured without the spacer, you get to add all the spacer volume into the port. Very simple to understand. Make the rule that the port volume is measured with the spacer and I bet you wont see anymore of them.

Exactly how do you do that with a sheet metal intake (and there are no plates) ?

[nhramnl]

Originally Posted by Joey Bohannon

Bert knows exactly what he is talking about! If they cc without the spacer plate there is a ton to gain. And if there wasn't gains to be had in port volume, then why do they make'm. Air speed can still be retained with more volume.

Joey and Bert are correct. This is EXACTLY what Westcott did to build the monsters he and his dad ran in SS/AH.

[bert powell]

Originally Posted by Jeff Niceswanger

Exactly how do you do that with a sheet metal intake (and there are no plates) ?

You are exactly right Jeff, sheet metal intake would cover it up. So the rule of not cutting into the valve cover bolt and angle of +/-2 degrees would put some parameters to the rule.

As for it being legal per the rulebook, the no external modifications wording makes it illegal. Also, isn't there a sentence somewhere in rulebook that if it doesn't say you can do it, then you can't? Not sure about that but recall something like it.

I looked at a bbc head last night and roughly calculated the 50-60cc number using 1.75"x2"x1" but the port is oval not rectangular. So it would not be that big but bet it is 30-40cc. The advantage would definitely be bigger for bbc verses sbc.

[fredjohnston]

The rule states the intake bolt holes must remain in original location. How can you cut 1" off the head and still leave the intake bolts in their original location? Or how about the valve cover bolt holes?

[SSDiv6]

Originally Posted by bert powell

If the port volume is measured without the spacer, you get to add all the spacer volume into the port. Very simple to understand. Make the rule that the port volume is measured with the spacer and I bet you wont see anymore of them.

The spacer is just an extension of the intake runner. Just adding more volume to the intake tract does not make more power. As Jeff Niceswanger stated, you can do the same with the proper sheet metal or billet intake or even by welding a cast intake.

[Kevin Panzino]

Originally Posted by bert powell

....
As for it being legal per the rulebook, the no external modifications wording makes it illegal.....

So per the rulebook, milling the deck surface of the head is illegal......

[l88427]

Originally Posted by nhramnl

Joey and Bert are correct. This is EXACTLY what Westcott did to build the monsters he and his dad ran in SS/AH.

Don't think so,Wescotts heads don't use plates and still retain the valve cover bolt holes...

[l88427]

Originally Posted by SSDiv6

The spacer is just an extension of the intake runner. Just adding more volume to the intake tract does not make more power. As Jeff Niceswanger stated, you can do the same with the proper sheet metal or billet intake or even by welding a cast intake.

This!

[bykr]

Originally Posted by SSDiv6

It is measured without the spacer and not all engines use a spacer. There is a lot more to to volume to make power with cylinder heads.

You just don't get it. So why do you think they're doing this? The guy that was doing it obviously thought it had an effect.