ZR-1 Net Registry Forums  

Go Back   ZR-1 Net Registry Forums > C4 ZR-1 > C4 ZR-1 Technical Postings

Reply
 
Thread Tools Display Modes
Old 03-27-2010   #21
Polo-1
 
Join Date: Sep 2005
Location: Washington
Posts: 955
Default Re: Camshafts almost done

my, what big lobes you have
Polo-1 is offline   Reply With Quote
Old 03-30-2010   #22
tpepmeie
 
Join Date: Aug 2005
Location: Fishers, IN
Posts: 815
Default 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
tpepmeie is offline   Reply With Quote
Old 03-30-2010   #23
Pete
 
Pete's Avatar
 
Join Date: Dec 2003
Location: Chicagoland,IL
Posts: 2,679
Default Re: Camshafts almost done

Quote:
Originally Posted by tpepmeie View Post
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
__________________
'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
Pete is offline   Reply With Quote
Old 03-30-2010   #24
tpepmeie
 
Join Date: Aug 2005
Location: Fishers, IN
Posts: 815
Default Re: Camshafts almost done

Quote:
Originally Posted by Pete View Post
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...

Last edited by tpepmeie; 03-30-2010 at 03:14 PM.
tpepmeie is offline   Reply With Quote
Old 04-01-2010   #25
Pete
 
Pete's Avatar
 
Join Date: Dec 2003
Location: Chicagoland,IL
Posts: 2,679
Default Re: Camshafts almost done

Quote:
Originally Posted by tpepmeie View Post
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
__________________
'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
Pete is offline   Reply With Quote
Old 04-01-2010   #26
flyin ryan
 
flyin ryan's Avatar
 
Join Date: Aug 2006
Location: Edmonton, Alberta or Phoenix, Arizona
Posts: 2,741
Default 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.
flyin ryan is offline   Reply With Quote
Old 04-01-2010   #27
tpepmeie
 
Join Date: Aug 2005
Location: Fishers, IN
Posts: 815
Default 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.


tpepmeie is offline   Reply With Quote
Old 04-05-2010   #28
XfireZ51
 
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,710
Default Re: Camshafts almost done

Quote:
Originally Posted by tpepmeie View Post
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?
XfireZ51 is offline   Reply With Quote
Old 04-05-2010   #29
tpepmeie
 
Join Date: Aug 2005
Location: Fishers, IN
Posts: 815
Default 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.
tpepmeie is offline   Reply With Quote
Old 04-06-2010   #30
XfireZ51
 
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,710
Default Re: Camshafts almost done

How will that affect your final cam profile if not looking for that last 10cfm?
XfireZ51 is offline   Reply With Quote
Reply


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 02:36 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright ZR-1 Net Registry 2020