Camshafts almost done - Page 3 - ZR-1 Net Registry Forums

Polo-1 · 03-27-2010

my, what big lobes you have

tpepmeie · 03-30-2010

First design was:
Intake 254@.050 .500" lift
exhaust 240@.050 .465" lift

Still tweaking the final specs... chasing an additional .020" intake lift

, and trying to find the right valve springs.

Todd

Pete · 03-30-2010

Quote:

Originally Posted by tpepmeie

First design was:
Intake 254@.050 .500" lift
exhaust 240@.050 .465" lift

Still tweaking the final specs... chasing an additional .020" intake lift

, and trying to find the right valve springs.

Todd

Todd, the extra lift really worth the hassle?
Does it pick up that much more CFM and finding a spring.

Pete

tpepmeie · 03-30-2010

Quote:

Originally Posted by Pete

Todd, the extra lift really worth the hassle?
Does it pick up that much more CFM and finding a spring.

Pete

Pete, we'll see. My heads don't let up until past .550 lift, so I'd like to capture as much of that flow as we can. They gain another 20+ cfm from .450 to .550. I only have 39.5mm intake valves, versus 40mm for the LPE cars, so the extra lift helps with the flow area. Target = 700 hp. (720? if I'm lucky). This is the "just because" motor... I'm trying stuff just because nobody else has...

Pete · 04-01-2010

Quote:

Originally Posted by tpepmeie

Pete, we'll see. My heads don't let up until past .550 lift, so I'd like to capture as much of that flow as we can. They gain another 20+ cfm from .450 to .550. I only have 39.5mm intake valves, versus 40mm for the LPE cars, so the extra lift helps with the flow area. Target = 700 hp. (720? if I'm lucky). This is the "just because" motor... I'm trying stuff just because nobody else has...

Todd,all the work and effort you put into this motor i hope you see 750hp

20 CFM is plenty and worth it,at least for me it would be.

Pete

flyin ryan · 04-01-2010

Try to get .020" more lift anyways, past where they turn the corner, if you can.

tpepmeie · 04-01-2010

Here's the headflow curve up to .550 lift. about 10 cfm from .450 to .500, another +10 to .550, then it flattens out, only 2 cfm gain to .600. I have to double check the retainer to valve guide clearance to see if we can go above .500.

XfireZ51 · 04-05-2010

Quote:

Originally Posted by tpepmeie

First design was:
Intake 254@.050 .500" lift
exhaust 240@.050 .465" lift

Still tweaking the final specs... chasing an additional .020" intake lift

, and trying to find the right valve springs.

Todd

Todd,

Have you finalized an LSA you'll be installing cams at?

tpepmeie · 04-05-2010

I think I've decided to stop at .500" lift. Spent the better part of the afternoon clearancing one head for the big lobes. Not sure I want to do it all again, and I can see where even more interference lurks if I go to 520. If I had a nice grinder like some of you guys it would go loads faster... but I was stuck using a dremel

. Wore out three bits to get through all that aluminum, and I only did one head.

XfireZ51 · 04-06-2010

How will that affect your final cam profile if not looking for that last 10cfm?

03-27-2010	#21
Polo-1 Join Date: Sep 2005 Location: Washington Posts: 955	Re: Camshafts almost done my, what big lobes you have

03-30-2010	#22
tpepmeie Join Date: Aug 2005 Location: Fishers, IN Posts: 815	Re: Camshafts almost done First design was: Intake 254@.050 .500" lift exhaust 240@.050 .465" lift Still tweaking the final specs... chasing an additional .020" intake lift , and trying to find the right valve springs. Todd

04-01-2010	#26
flyin ryan Join Date: Aug 2006 Location: Edmonton, Alberta or Phoenix, Arizona Posts: 2,741	Re: Camshafts almost done Try to get .020" more lift anyways, past where they turn the corner, if you can. __________________ There are no limit's mans ingenuity, just as mans ingenuity will never conquer the forces & behavior of this planet...Smokey Y.

04-01-2010	#27
tpepmeie Join Date: Aug 2005 Location: Fishers, IN Posts: 815	Re: Camshafts almost done Here's the headflow curve up to .550 lift. about 10 cfm from .450 to .500, another +10 to .550, then it flattens out, only 2 cfm gain to .600. I have to double check the retainer to valve guide clearance to see if we can go above .500.

04-05-2010	#29
tpepmeie Join Date: Aug 2005 Location: Fishers, IN Posts: 815	Re: Camshafts almost done I think I've decided to stop at .500" lift. Spent the better part of the afternoon clearancing one head for the big lobes. Not sure I want to do it all again, and I can see where even more interference lurks if I go to 520. If I had a nice grinder like some of you guys it would go loads faster... but I was stuck using a dremel . Wore out three bits to get through all that aluminum, and I only did one head.

04-06-2010	#30
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,709	Re: Camshafts almost done How will that affect your final cam profile if not looking for that last 10cfm?