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-   -   NHRA 2020 Rule Amendment SS Intakes??? (https://classracer.com/classforum/showthread.php?t=74879)

bert powell 01-30-2020 05:10 PM
Re: NHRA 2020 Rule Amendment SS Intakes???
 
Quote:
Originally Posted by SSDiv6 (Post 607148)
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 01-30-2020 05:15 PM
Re: NHRA 2020 Rule Amendment SS Intakes???
 
Quote:
Originally Posted by bert powell (Post 607165)
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 01-30-2020 05:27 PM
Re: NHRA 2020 Rule Amendment SS Intakes???
 
Quote:
Originally Posted by Joey Bohannon (Post 607149)
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 01-30-2020 06:02 PM
Re: NHRA 2020 Rule Amendment SS Intakes???
 
Quote:
Originally Posted by Jeff Niceswanger (Post 607166)
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 01-30-2020 08:01 PM
Re: NHRA 2020 Rule Amendment SS Intakes???
 
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 01-30-2020 09:02 PM
Re: NHRA 2020 Rule Amendment SS Intakes???
 
Quote:
Originally Posted by bert powell (Post 607165)
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 01-30-2020 09:25 PM
Re: NHRA 2020 Rule Amendment SS Intakes???
 
Quote:
Originally Posted by bert powell (Post 607169)
....
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......:rolleyes:

l88427 01-30-2020 10:01 PM
Re: NHRA 2020 Rule Amendment SS Intakes???
 
Quote:
Originally Posted by nhramnl (Post 607168)
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 01-30-2020 10:03 PM
Re: NHRA 2020 Rule Amendment SS Intakes???
 
Quote:
Originally Posted by SSDiv6 (Post 607178)
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 01-30-2020 10:32 PM
Re: NHRA 2020 Rule Amendment SS Intakes???
 
Quote:
Originally Posted by SSDiv6 (Post 607154)
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.


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