head article

[sbc charlie]

william denish is writing an article about air flow in cylinder heads. he has been here at the shop having me try different things for him on this article. plans include to basline a stock cylinder head and then cnc machine different valve angles and valve to seat contact angles. the affect that they have on airflow. how port velocity is figured both mathematically and by using pitot tube to measure velocity. thanks sbc

[compressor#v]

Any chance you can pick his (Dennish) brain on squish grooves?

[wfolarry]

When I was in Cinci for the dealer show they told me at the Newen booth that they were already working on that. Are you doing something different or was there a change in plans?

[Faast Ed]

HI Larry!

Can you direct me to a string on this board where they are discussing the groovies?
So far, mine are behaving like champs. Not surprised a bit. Thanks for turning me on to them.

[wfolarry]

Originally Posted by Faast Ed

HI Larry!

Can you direct me to a string on this board where they are discussing the groovies?
So far, mine are behaving like champs. Not surprised a bit. Thanks for turning me on to them.

I don't think anybody here has tried them yet.

[Totenkopf]

Originally Posted by wfolarry

I don't think anybody here has tried them yet.

Bruce Woltz was talking about it last year.


personally, I'm mentally having a hard time seeing the benefit of grooves versus say an angled squish with say a 2* or 3* taper. All the grooves are doing is allowing space for the gas / air to be directed to the chamber. right? or am I missing something here.

[wfolarry]

Originally Posted by Totenkopf

Bruce Woltz was talking about it last year.


personally, I'm mentally having a hard time seeing the benefit of grooves versus say an angled squish with say a 2* or 3* taper. All the grooves are doing is allowing space for the gas / air to be directed to the chamber. right? or am I missing something here.

Yea you're right. Forgot about Bruce.

[Faast Ed]

The results often are quite rewarding.

"All they are doing" seems to be a lot. Leaner afr with less required timing is making my 206ccp chambers run like a lower compression bike. No hard starts or ping. (No releases).

[wfolarry]

I think Bruce did a set of heads for his bike that he's going to try them out.

[claydbal]

Originally Posted by wfolarry

I don't think anybody here has tried them yet.

care to share how you do the machine work? calculators show i will be at over 220 ccp if i ever get time to put it back together. no prob experimenting with the grooves for ya. also have a set of 615/585 cams i could report on----given time.

[wfolarry]

Originally Posted by claydbal

care to share how you do the machine work? calculators show i will be at over 220 ccp if i ever get time to put it back together. no prob experimenting with the grooves for ya. also have a set of 615/585 cams i could report on----given time.

If you want you can send me the heads & I'll groove them for free. Just pay for the shipping. I'd like to see more guys try this from different parts of the country where the gas might not be so good.

[claydbal]

Originally Posted by wfolarry

If you want you can send me the heads & I'll groove them for free. Just pay for the shipping. I'd like to see more guys try this from different parts of the country where the gas might not be so good.

our gas is good, but temps and humidity are killer. also at or near sea level, beaches are about 60-70 miles south..i will pm ya monday for shipping info.

[joelp34252]

Didn't the guys who initially tried this groove the pistons instead of the heads? Seems like it wouldnt make any difference either way.

Joel 2001 FLHT

[Hillside]

Originally Posted by sbc charlie

william denish is writing an article about air flow in cylinder heads. he has been here at the shop having me try different things for him on this article. plans include to basline a stock cylinder head and then cnc machine different valve angles and valve to seat contact angles. the affect that they have on airflow. how port velocity is figured both mathematically and by using pitot tube to measure velocity. thanks sbc

Sounds like you'll be in his latest book.

[1711tab]

Originally Posted by Hillsidecycle.com

Sounds like you'll be in his latest book.

That's not as high profile as your stardom. You being a TV STAR...