[Z06] • • • RPM CNC LS7 Heads - Flow Numbers • • •
08-23-2008, 02:16 PM
#41
Burning Brakes
Member Since: Jul 1999
Location: Mobile AL
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charlie, if you wouldn't mind, could you explain the reasoning for the cfm drop on the flow data you have for the factory gm ls7 head? How can the flow actually go down? I could understand that if it's flowed in a bore that is small, thus more lift shrouds the valve. If this was the case, both heads should have been flowed on the same bore size. However, you showed a 4.125" bore size. Did the radius plate possibly cause this?
Sorry, just trying to make sense of that, that's all. Thanks!
Sorry, just trying to make sense of that, that's all. Thanks!
08-23-2008, 02:45 PM
#42
Awesome. It looks like I know where my heads will be shipped to over the winter..
I have the Katech cam package (Kooks headers). I wonder what kind of final dyno numners power I would see with these ported heads. Heck, 550 or more and I am a happy camper.
I have the Katech cam package (Kooks headers). I wonder what kind of final dyno numners power I would see with these ported heads. Heck, 550 or more and I am a happy camper.
08-23-2008, 03:10 PM
#43
Safety Car
On a stock motor, it's been shown that the cam that is the bottleneck to more power from the LS7 mill.
The extra flow of these heads would likely not gain you much unless you open the cam significantly lto take advantage of the extra flow the heads provide.
I'd suspect you'd need to get into a 240/250 cam to see what these heads can do. Not to mention, the LS7 intake can only flow 330cfm max, so again, another restriction that would need to be addressed to see the full potential of these heads.
Having said all that, I'd love to see a dyno comparison between the LS7 and the CNC'd LS7 heads that would prove me wrong.
The extra flow of these heads would likely not gain you much unless you open the cam significantly lto take advantage of the extra flow the heads provide.
I'd suspect you'd need to get into a 240/250 cam to see what these heads can do. Not to mention, the LS7 intake can only flow 330cfm max, so again, another restriction that would need to be addressed to see the full potential of these heads.
Having said all that, I'd love to see a dyno comparison between the LS7 and the CNC'd LS7 heads that would prove me wrong.
08-23-2008, 05:27 PM
#45
Former Vendor
Thread Starter
Actually, there is sufficient flow restriction in the intake manifold and reshaping it will net 12-18 RWHP.
Stock vs CNC'd will likely not show gains but once you start the mods the additional flow is required.
08-23-2008, 05:28 PM
#46
Former Vendor
Thread Starter
Send me the cam specs and I'll run the numbers through our design software....
08-24-2008, 10:48 PM
#47
Burning Brakes
Member Since: Jul 1999
Location: Mobile AL
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Curious, I've never seen a stock head on a vehicle have flow go turbulent. What's the reason that other companies haven't shown this to be the case when they have released their flow numbers for their LS7 heads and then compare them to the flow numbers they got from the factory heads?
I'm just trying to understand, that's all, buddy. I'm very interested in your port work, and I will be contacting you soon.
08-25-2008, 02:05 PM
#48
Melting Slicks
Charlie, sorry to re-post:
WOW! Outstanding development especially since there is no adverse impact to the numbers down low. Do you have a comparison on the intake runner size in cc's?
09-03-2008, 02:49 PM
#51
Please disregard my PM I sent you. The answers to my questions are stated within your original post.
Here is the cam specs for the Torquer cam. PLEASE do run the numbers through design software and let me know. I will be talking to you really soon regarding my heads getting ported.
Cam specs:
220 / 244 @ .050, .615 / .648 lift, 110 LSA
09-05-2008, 02:58 PM
#52
Former Vendor
Thread Starter
RPM,
Please disregard my PM I sent you. The answers to my questions are stated within your original post.
Here is the cam specs for the Torquer cam. PLEASE do run the numbers through design software and let me know. I will be talking to you really soon regarding my heads getting ported.
Cam specs:
220 / 244 @ .050, .615 / .648 lift, 110 LSA
Please disregard my PM I sent you. The answers to my questions are stated within your original post.
Here is the cam specs for the Torquer cam. PLEASE do run the numbers through design software and let me know. I will be talking to you really soon regarding my heads getting ported.
Cam specs:
220 / 244 @ .050, .615 / .648 lift, 110 LSA
09-05-2008, 03:00 PM
#53
Former Vendor
Thread Starter
09-05-2008, 03:01 PM
#54
Former Vendor
Thread Starter
09-05-2008, 03:01 PM
#55
Former Vendor
Thread Starter
Charlie, thanks for your reply. I do appreciate that. I see what you're saying.
Curious, I've never seen a stock head on a vehicle have flow go turbulent. What's the reason that other companies haven't shown this to be the case when they have released their flow numbers for their LS7 heads and then compare them to the flow numbers they got from the factory heads?
I'm just trying to understand, that's all, buddy. I'm very interested in your port work, and I will be contacting you soon.
Curious, I've never seen a stock head on a vehicle have flow go turbulent. What's the reason that other companies haven't shown this to be the case when they have released their flow numbers for their LS7 heads and then compare them to the flow numbers they got from the factory heads?
I'm just trying to understand, that's all, buddy. I'm very interested in your port work, and I will be contacting you soon.
09-06-2008, 04:22 PM
#56
Burning Brakes
Dyno results are in - Charlie does it again!
I have the before and after Dyno results from the LS7 ported heads.
All else being equal.
Charlie does it again!
Here is the link
http://s262.photobucket.com/albums/i...ortedHeads.jpg
I'll let Charlie comment on the technical aspects while I'll enjoy the new found performance
Cheers
Rich
All else being equal.
Charlie does it again!
Here is the link
http://s262.photobucket.com/albums/i...ortedHeads.jpg
I'll let Charlie comment on the technical aspects while I'll enjoy the new found performance
Cheers
Rich
09-06-2008, 05:10 PM
#57
Former Vendor
Thread Starter
I have the before and after Dyno results from the LS7 ported heads.
All else being equal.
Charlie does it again!
Here is the link
http://s262.photobucket.com/albums/i...ortedHeads.jpg
I'll let Charlie comment on the technical aspects while I'll enjoy the new found performance
Cheers
Rich
All else being equal.
Charlie does it again!
Here is the link
http://s262.photobucket.com/albums/i...ortedHeads.jpg
I'll let Charlie comment on the technical aspects while I'll enjoy the new found performance
Cheers
Rich
Rich,
Thanks....your car has more power everywhere and will be quicker than before (although you were already extremely quick at the track!)
Thanks again,
Charlie
