is this possible? - Page 4 - ZR-1 Net Registry Forums

DaveK · 02-14-2007

Scepticism until something is actually proven is a healthy attitude, that said the Jaguar V12 we used to race which uses a similar (albeit single) OHC setup was very sensitive to cam timing.

tomtom72 · 02-15-2007

Hi Guys, I guess I'm in Aurora40's camp, I would like to learn more. I have the CD on the advanced ZR-1 course from STG....alot of us got copies the last go 'round from a brother owner.

I'm not anything but a backyard type but a professional mechanic friend of mine "taught" me on two of my own motors about rebuilding a sb chevy. He insisted that I learn how to "degree a cam". I know one thing for sure, the process made a big difference in my boat motor as to where in the rpm range I got power. Can't say anything about the LT-1 in my C3...I put that cam in at the factory "center line"(?) or "straight-up". I did degree it & found that I had to "adjust" the cam gear to get that on the money. Just like my mechanic friend said I would have to.

In the STG CD the subject on the cams was a bit light on all of that stuff. Is an LT5 done in a different way? I mean they made it sound simple....or perhaps it was the simpleton watching the CD.

Would anyone like to share a good information source that could be used as a learning tool????

Tom

jonszr1 · 02-15-2007

I would talk to the different tuners. I talked with corey about the timing thing and he says its 10 to 15 max . also when you go after the hp figs you start to loose low end tq. the timing can make a bigger diff in the 368-385s due to the unshrouding of the valves.

95ZR1#418 · 02-16-2007

Quote:

Originally Posted by 40th#381

My 93 Dynoed @ 371 HP @ BG in May 04.
The engine is stock with Marc Randolf chip Jeal headers and
Corsa exhaust w/no cats (thanks FL).

As you know those Ruby's are special :-)

Jan

Speaking of dyno's. Do the rear gears make any difference in the numbers. For example the same car with stock gears vs the same car with 4:30's in a dyno run??

jonszr1 · 02-16-2007

I asked Corey that when we were dynoing my car after the port job and was told no it doesn't change the readings at all

Aurora40 · 02-24-2007

http://zr1specialist.com/HAT%20Web/a..._camshafts.htm

tomtom72 · 02-27-2007

Thanks for the link Bob! I don't think that this guy is gonna be doing any cam timming on an LT5 any time soon after reading that write up!

That's a bit more than I wanna do at my skill level! That ain't no typical sb chevy stuff!

Tom

Kevin · 02-27-2007

I think vandorn had the magical cam timing setup for a stock cube motor back in the day

FU · 02-28-2007

There is a 91 out there with some bolt on's and P&P work timed cam's that run's 11:5's @ 123 + all day long.

And yes I do beleive that 8388's reading's are correct

A good bolt on P&P car is a hard combo to beat for the $$

jonszr1 · 02-28-2007

Frank, I too would believe him if the motor was ported. but if you read it closely , he stgates it is an absoultly stk motor with no porting at all. TOTALLY STOCK. THAT I DO NOT BELIEVE. I offered to pay for a test session @ Coreys' . he replied with a smart mouthed punk statement. that I was being childish. No class just a little punk with a mouth. IMHO.

02-14-2007	#31
DaveK Join Date: Jul 2004 Location: Sudbury, Ontario. Canada Posts: 1,538	Re: is this possible? Scepticism until something is actually proven is a healthy attitude, that said the Jaguar V12 we used to race which uses a similar (albeit single) OHC setup was very sensitive to cam timing. __________________ 1991 #1516 Black/Black davidmkelly.com "Speed is often confused with insight." - Johan Cruijff

02-15-2007	#32
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,645	Re: is this possible? Hi Guys, I guess I'm in Aurora40's camp, I would like to learn more. I have the CD on the advanced ZR-1 course from STG....alot of us got copies the last go 'round from a brother owner. I'm not anything but a backyard type but a professional mechanic friend of mine "taught" me on two of my own motors about rebuilding a sb chevy. He insisted that I learn how to "degree a cam". I know one thing for sure, the process made a big difference in my boat motor as to where in the rpm range I got power. Can't say anything about the LT-1 in my C3...I put that cam in at the factory "center line"(?) or "straight-up". I did degree it & found that I had to "adjust" the cam gear to get that on the money. Just like my mechanic friend said I would have to. In the STG CD the subject on the cams was a bit light on all of that stuff. Is an LT5 done in a different way? I mean they made it sound simple....or perhaps it was the simpleton watching the CD. Would anyone like to share a good information source that could be used as a learning tool???? Tom __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member

02-15-2007	#33
jonszr1 Join Date: Sep 2006 Location: lone pine and mammoth lakes Posts: 1,407	Re: is this possible? I would talk to the different tuners. I talked with corey about the timing thing and he says its 10 to 15 max . also when you go after the hp figs you start to loose low end tq. the timing can make a bigger diff in the 368-385s due to the unshrouding of the valves.

02-16-2007	#35
jonszr1 Join Date: Sep 2006 Location: lone pine and mammoth lakes Posts: 1,407	Re: is this possible? I asked Corey that when we were dynoing my car after the port job and was told no it doesn't change the readings at all

02-24-2007	#36
Aurora40 Join Date: May 2005 Location: Leesburg, VA Posts: 2,713	Re: is this possible? http://zr1specialist.com/HAT%20Web/a..._camshafts.htm __________________ Bob Saveland Former owner of #2517 [IMG]http://a.random-image.net/aurora40/vette.jpg[/img]

02-27-2007	#37
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,645	Re: is this possible? Thanks for the link Bob! I don't think that this guy is gonna be doing any cam timming on an LT5 any time soon after reading that write up! That's a bit more than I wanna do at my skill level! That ain't no typical sb chevy stuff! Tom __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member

02-27-2007	#38
Kevin Join Date: Jun 2005 Location: pittsburgh Posts: 4,632	Re: is this possible? I think vandorn had the magical cam timing setup for a stock cube motor back in the day __________________ It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B"

02-28-2007	#39
FU Join Date: Mar 2004 Location: Found Member Posts: 4,346	Re: is this possible? There is a 91 out there with some bolt on's and P&P work timed cam's that run's 11:5's @ 123 + all day long. And yes I do beleive that 8388's reading's are correct A good bolt on P&P car is a hard combo to beat for the $$ __________________ Frank Urbo. NCM Lifetime member # 982 Registry Founding # 237

02-28-2007	#40
jonszr1 Join Date: Sep 2006 Location: lone pine and mammoth lakes Posts: 1,407	Re: is this possible? Frank, I too would believe him if the motor was ported. but if you read it closely , he stgates it is an absoultly stk motor with no porting at all. TOTALLY STOCK. THAT I DO NOT BELIEVE. I offered to pay for a test session @ Coreys' . he replied with a smart mouthed punk statement. that I was being childish. No class just a little punk with a mouth. IMHO.