03-27-2010 | #21 |
Join Date: Sep 2005
Location: Washington
Posts: 955
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Re: Camshafts almost done
my, what big lobes you have
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03-30-2010 | #22 |
Join Date: Aug 2005
Location: Fishers, IN
Posts: 815
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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 |
03-30-2010 | #23 | |
Join Date: Dec 2003
Location: Chicagoland,IL
Posts: 2,679
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Re: Camshafts almost done
Quote:
Todd, the extra lift really worth the hassle? Does it pick up that much more CFM and finding a spring. Pete
__________________
'91 #1635 PoloGreen 350 LT5 11.09 @ 129.27 11.04 @ 128.86 474RWHP 400RWTQ http://www.youtube.com/watch?v=SFNFOhGGlR4 http://www.youtube.com/watch?v=ZlRIOMwaDYY https://sites.google.com/site/peteszr1garage |
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03-30-2010 | #24 |
Join Date: Aug 2005
Location: Fishers, IN
Posts: 815
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Re: Camshafts almost done
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...
Last edited by tpepmeie; 03-30-2010 at 03:14 PM. |
04-01-2010 | #25 | |
Join Date: Dec 2003
Location: Chicagoland,IL
Posts: 2,679
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Re: Camshafts almost done
Quote:
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
__________________
'91 #1635 PoloGreen 350 LT5 11.09 @ 129.27 11.04 @ 128.86 474RWHP 400RWTQ http://www.youtube.com/watch?v=SFNFOhGGlR4 http://www.youtube.com/watch?v=ZlRIOMwaDYY https://sites.google.com/site/peteszr1garage |
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04-01-2010 | #26 |
Join Date: Aug 2006
Location: Edmonton, Alberta or Phoenix, Arizona
Posts: 2,741
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Re: Camshafts almost done
Try to get .020" more lift anyways, past where they turn the corner, if you can.
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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 |
Join Date: Aug 2005
Location: Fishers, IN
Posts: 815
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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.
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04-05-2010 | #28 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,710
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Re: Camshafts almost done
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04-05-2010 | #29 |
Join Date: Aug 2005
Location: Fishers, IN
Posts: 815
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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.
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04-06-2010 | #30 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,710
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Re: Camshafts almost done
How will that affect your final cam profile if not looking for that last 10cfm?
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