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12-06-2010
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#1 |
 
Join Date: Dec 2003
Location: Arcadia, OK
Posts: 3,397
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Need Technical Data; cam timing, balancing, etc.
Fill in the yellow blanks
 I could sure use some technical data regarding Stage III cam timing as I don't know if the grind has any timing mods relative to crank dead center positions. I'm guessing it's the same as stock, but prefer not to guess. So, need some expert assistance. Also need other weight info as highlighted in yellow. 
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Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed. Last edited by A26B; 12-13-2010 at 10:25 AM. Reason: Corrections & Updates |
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12-08-2010
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#2 |
Join Date: Dec 2003
Location: Chicagoland,IL
Posts: 2,667
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Re: Need Technical Data; cam timing, balancing, etc.
It won't let me write in the yellow so i wrote on the white.
Inlet opening primary & secondary 32 Inlet closing primary & secondary 80 Exhaust opening primary & secondary 80 Exhaust closing primary & secondary 32 Above would be set at 114. 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; 12-13-2010 at 11:12 AM. |
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12-08-2010
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#3 | |
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Join Date: Aug 2005
Location: Fishers, IN
Posts: 812
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Re: Need Technical Data; cam timing, balancing, etc.
Quote:
Seat duration, for hydraulic lifter cams, is usually measured at 0.004" lobe lift to account for some lifter deflection. Todd |
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12-08-2010
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#4 |
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Join Date: Dec 2003
Location: Chicagoland,IL
Posts: 2,667
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Re: Need Technical Data; cam timing, balancing, etc.
Todd, i was just doing an estimate of what it is.
If at 285 i would minus 3 degrees on either side. I will have the Stage III's measured,i know i had the Stage II's checked i just don't remember what they were i have the info somewhere. Todd,do you remember what the Stage II's were? that might give some insight. Jerry,can i ask you why the interest on cams. 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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12-12-2010
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#5 |
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Join Date: Dec 2003
Location: Arcadia, OK
Posts: 3,397
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Re: Need Technical Data; cam timing, balancing, etc.
Pete, Todd & Ryan,
Thanks for chiming in in this. I can't think of any better guys to call on! Pete, The info is for bearing load calculations. Any idea when you might get the Stage III cams measured?
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Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed. Last edited by A26B; 12-13-2010 at 10:42 AM. |
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12-12-2010
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#6 |
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Join Date: Aug 2005
Location: Fishers, IN
Posts: 812
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Re: Need Technical Data; cam timing, balancing, etc.
Jerry,
I weighed up a stock 90 bottom end parts. The pistons actually came it at an average 710g, but close enough to your figure. Range was 708-713.5g. I had in my notes around 538g for rotating weight on the rods. I didn't measure it, though, so can't be sure where I got that from. Probably took the % from a prototype lotus build sheet I saw. Should get you pretty close. That includes the bolts. |
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12-12-2010
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#7 | ||
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Join Date: Dec 2003
Location: Arcadia, OK
Posts: 3,397
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Re: Need Technical Data; cam timing, balancing, etc.
Quote:
"A" pistons @ 483~487gr, avg of 484gr "B" pistons @ 479~483gr, avg of 482gr (2gr lighter) Pins, retainers & rings are much more consistent, so the variance probably comes down to the bare piston and the basis GM used for sorting pistons in "A" & "B" groups. Quote:
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Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed. Last edited by A26B; 12-13-2010 at 09:52 AM. |
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12-13-2010
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#8 | |
 
Join Date: Aug 2006
Location: Edmonton, Alberta or Phoenix, Arizona
Posts: 2,736
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Re: Need Technical Data; cam timing, balancing, etc.
Quote:
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12-13-2010
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#9 |
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Join Date: Dec 2003
Location: Arcadia, OK
Posts: 3,397
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Re: Need Technical Data; cam timing, balancing, etc.
This is some information I dug up out of my files. I don't have any reference point for valve seat/opening, but from the short durations, I would imagine 0.050".
Stock Cams Intake .214 .229 .389 .389 Exhaust .214 .214 .389 .389 SGC Cams Stage I .228 .228 .415 .415 Stage II .237 .237 .440 .440 Stage III .242 .242 .450 .450 LPE Cams A Cams Intake .221 .236 .399 .445 Exhaust .221 .221 .399 .399 B Cams Intake .239 .239 .445 .445 Exhaust .221 .221 .399 .399 C Cams Intake .239 .239 .445 .445 Exhaust .239 .239 .445 .445
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Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed. |
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12-13-2010
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#10 | |
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Join Date: Dec 2003
Location: Chicagoland,IL
Posts: 2,667
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Re: Need Technical Data; cam timing, balancing, etc.
Quote:
I would like to know the power difference between LPE B and C cams. I have tested SGC Stg II's In & Ex replaced exhaust with a .224 .420 picked up 25RWHP,i'm starting to think we don't need more then .225-+ exhaust cam. 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; 12-13-2010 at 11:58 AM. |
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Linear Mode
