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900HP · 06-20-2014, 10:34 AM

This is what Chad meant on the Pontiac chamber.............

900HP · 06-20-2014, 10:36 AM

A lot smaller too so no big domes needed. 52cc as I recall?

900HP · 06-20-2014, 10:41 AM

Just in case any of you forgot there was another fully CNC'd (fully bad-ass) cylinder head option out there.

Chris Petersen · 06-20-2014, 11:26 AM

Quote:

Originally Posted by 900HP

Just in case any of you forgot there was another fully CNC'd (fully bad-ass) cylinder head option out there.

I dont mean to hijack David's thread, but I have not seen much information posted about the new pro-ports with reguards to proformance and price (price of a finished head that would make xxxx HP). If you have CNC options for thease heads, maybe post up a new thread with more information about them? I am sure other would like to know more too.

900HP · 06-20-2014, 11:54 AM

Quote:

Originally Posted by Chris Petersen

I dont mean to hijack David's thread, but I have not seen much information posted about the new pro-ports with reguards to proformance and price (price of a finished head that would make xxxx HP). If you have CNC options for thease heads, maybe post up a new thread with more information about them? I am sure other would like to know more too.

Sorry. There was no intent to hi-jack, I thought we were having a combustion chamber discussion. If you want to know more about the cnc pro-ports available, just visit Speier Racing Heads

http://www.speierracingheads.com/emcpp.htm

Chad Speier · 06-20-2014, 12:39 PM

Quote:

Originally Posted by john marcella

Don't look like a Pontiac head to me.

LOL, your right. I saw new chamber and had just finished that up for the CNC program. It's a Mopar.. I wasn't thinking straight, hot as hell..

Chris Petersen · 06-20-2014, 12:43 PM

Quote:

Originally Posted by 900HP

Sorry. There was no intent to hi-jack, I thought we were having a combustion chamber discussion. If you want to know more about the cnc pro-ports available, just visit Speier Racing Heads

http://www.speierracingheads.com/emcpp.htm

Sorry, I didnt mean to come off rude if I did.

Nice web site! Love the colors of your test car. That is one stout engine you built for the EMC.

Chris Petersen · 06-20-2014, 12:44 PM

And David, I think the best way to remove the dust is by driving it!

Is yours a street/strip car? Or track only?

john marcella · 06-20-2014, 01:33 PM

Quote:

Originally Posted by 900HP

A lot smaller too so no big domes needed. 52cc as I recall?

That's got to be smaller than 52 cc. At least it looks smaller than mine and mine was 46 cc with 6cc from valve dish to get weight out of the valve.

David Holmberg · 06-20-2014, 02:35 PM

All information is always welcome!

Chris its always been a streetcar that goes to the track. The kids loved it when I would pick them up from school in it.

mchell · 06-20-2014, 04:33 PM

Sweeeeeeet looking combustion chambers!

455-4+1 · 06-20-2014, 04:50 PM

Whats with the little "diddy" in the chamber at 6 oclock on the intake valve. Thought it might be
Just the intersection of 2 radial sweeps from the cutter, but then thought it might have some secret 10hp purpose lol

Chad Speier · 06-20-2014, 05:36 PM

I had to mill it to get it at 52cc. Here is a view like John's. I might be layed back more.

Stan Weiss · 06-20-2014, 06:27 PM

Quote:

Originally Posted by 455-4+1

Whats with the little "diddy" in the chamber at 6 oclock on the intake valve. Thought it might be
Just the intersection of 2 radial sweeps from the cutter, but then thought it might have some secret 10hp purpose lol

Quote:

Originally Posted by Chad Speier

I had to mill it to get it at 52cc. Here is a view like John's. I might be layed back more.

Chad,
I think he is asking about John's head.

Stan

john marcella · 06-20-2014, 10:07 PM

Quote:

Originally Posted by 455-4+1

Whats with the little "diddy" in the chamber at 6 oclock on the intake valve. Thought it might be
Just the intersection of 2 radial sweeps from the cutter, but then thought it might have some secret 10hp purpose lol

Flow bench trick, 7cfm on that head. Normally I don't do that chit but I thought........there is really no fuel at that part of the chamber and its not in the way of any fire so I let it fly. Doubt I will do it again.

Aaron Quinton · 06-20-2014, 11:27 PM

So who has some shots of the BES EMC chamber that ran pump gas at 15:1? That's what I want to see. My guess is it doesn't look much different that what has been shown.

Thanks to Speier and Marcella for sharing some good chamber info, it's appreciated.

So why aren't people smoothing the CNC chambers to reduce surface area by 2x for better efficiency? Detontation control on pump gas?

David Holmberg · 06-21-2014, 12:13 AM

Aaron, my guess is the grooves help with the swirl.

john marcella · 06-21-2014, 03:23 AM

Quote:

Originally Posted by David Holmberg

Aaron, my guess is the grooves help with the swirl.

No, The grooves from the tool path just don't matter. IMO

john marcella · 06-21-2014, 03:32 AM

Quote:

Originally Posted by Aaron Quinton

So who has some shots of the BES EMC chamber that ran pump gas at 15:1? That's what I want to see. My guess is it doesn't look much different that what has been shown.

Thanks to Speier and Marcella for sharing some good chamber info, it's appreciated.

So why aren't people smoothing the CNC chambers to reduce surface area by 2x for better efficiency? Detontation control on pump gas?

The finish on my whole head is a cutter finish done by hand not cnc. IMO polishing is just a waste of time.

David Holmberg · 06-21-2014, 12:00 PM

Quote:

Originally Posted by john marcella

The finish on my whole head is a cutter finish done by hand not cnc.

Damn that's impressive.

The grooves have to influence the outer boundary of air, giving at least a small amount of direction. It may be nothing, or it may be an unintended consequence that proves positive.

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