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01-23-2010
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#11 | |
 
Join Date: Dec 2003
Location: Chicagoland,IL
Posts: 2,679
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Re: cam timing
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Does she have a twin sister  Then i will tell where the mason jars are buried. Pete
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'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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01-27-2010
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#12 |
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Join Date: Dec 2003
Location: Chicagoland,IL
Posts: 2,679
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Re: cam timing
Go with 114In 108Ex you will be
 Pete
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'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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01-27-2010
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#13 | |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,708
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Re: cam timing
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What were the results that you liked about this set of timing numbers? Would these be for ported top end, ported heads etc or doe it not make a diff? |
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01-27-2010
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#14 |
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Join Date: Dec 2003
Location: Chicagoland,IL
Posts: 2,679
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Re: cam timing
The same reason smaller exhaust cams make more power in the LT5.
Start to open exhaust a little later less loss  I know there is long techy term on the web i'll leave that up to somebody else to look up copy and paste. We tried 108 In with what i remember to be 115 or 116Ex gotta look it up,it was on advise from one of the big cam companies. Not good at all,loss through out basicly it was the worst. Some should stick to single cam motors. Exhaust opening way too early, intake closes too fast. Can somebody post Marc H's Cam Timing event pictures on page 10. Pete
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'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 Last edited by Pete; 01-27-2010 at 02:50 PM. |
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01-27-2010
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#15 | |
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Join Date: Apr 2009
Location: Prather, CA
Posts: 809
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Re: cam timing
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 Here is the cam event timing picture:  Here is the before and after dyno graph on the previous page: 
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[IMG]http://i13.photobucket.com/albums/a292/bdw18_123/_zr1netforumsigphoto.jpg[/IMG][B] 1990 Corvette ZR-1 [/B][I] White/Flame Red, #2299, mostly stock, 144K miles.[/I] -Cams timed to the '93-'95 405HP LT5 stock timing. -IAT sensor relocated to below front bumper. -Haibeck hoops installed in airduct. -OBX cat-back exhaust. [COLOR=DarkRed][B](SOLD - December 2012 [/B][/COLOR][COLOR=DarkRed][B]:hello:)[/B][/COLOR] 1993 Corvette Coupe Black/Black, 6-speed (SOLD - October 2009 :hello:) |
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01-31-2010
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#16 |
 
Join Date: Aug 2006
Location: Edmonton, Alberta or Phoenix, Arizona
Posts: 2,741
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Re: cam timing
Glad you got it
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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. |
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04-22-2010
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#17 |
Join Date: Aug 2006
Location: Texas
Posts: 518
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Re: cam timing
[QUOTE=Dynomite;87525]I am now using Intake 114 and Exhaust 108 for ported top end (plenum/injector housing/heads)and SW headers with SW 3 inch exhaust (no CATS) 91'.
Marc suggests to have a broad torque and power range (3000 to 7000 rpm) use I 114 and E 110. 114/114 is nice when trying to tame idle roughness out of a cammed engine. I I notice the factory cam timing specs may be different on a 90-92 versus a 93? I see on one diagram that the 90-92 are set at I114 and E114. I assumed that is factory engine with the pinned settings. The single flats on a 91' camshaft/vernier plate have a play of up to 6 degrees (crankshaft degrees). I think 93's have double flats with the play cut in half or 3 degrees (crankshaft degrees). http://www.zr1.net/forum/showpost.ph...8&postcount=13 /QUOTE] Stupid question: How does Stage One cam grind effect cam timing on a 91 engine with the same mods?
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1991 ZR-1, Black, Black, # 541 |
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