Chain help
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
Lots of misinformation here. People there is a difference between ignition timing and valve timing. The Ignition timing curve was not set up for performance by GM but was set for optimal emmisions. Recurving the distributor is the best way to pick up some performance not just setting your ignition timing 4 degrees advanced. Advancing your valve timing might give you a little more bottom end but will sacrifice power up top and likely reduce ET's. Best off getting a cam that is designed to work in the powerband that matches your compression, driving style and gearing.
Le Mans Master
Joined: Oct 2010
Posts: 6,922
Likes: 839
From: melbourne florida
2023 C3 of the Year Finalist - Modified
yes lots of misinformation. the L-82 cam is the350/350 cam. it was originally designed to be run straight up. just like the ignition they retarded the timing there too. that cam goes nicely to 6000 r.p.m how high. do you want to go? if you think ignition timing helps you should try this. just the increased cylinder pressure helps. your right about cam timing but there are other factors at play here.
Melting Slicks
Joined: Aug 2008
Posts: 2,200
Likes: 3
From: Lehigh county Pennsylvania
http://www.summitracing.com/parts/HRS-94505
Drifting
Joined: Jul 2002
Posts: 1,944
Likes: 20
From: The only Corvettes in Highett Victoria
Now, where can I get one?
69 Chevy,
Thanks for that, I'll now have to try to find a set in Australia. If not, I have Summit's number.
Regards from Down Under.
aussiejohn
Thanks for that, I'll now have to try to find a set in Australia. If not, I have Summit's number.
Regards from Down Under.
aussiejohn
Le Mans Master
Joined: Jun 2004
Posts: 6,231
Likes: 65
From: Seattle WA
St. Jude Donor '14
...along with the machine shop to drill out the cam gear. I'd expect by the time you're done a Cloyes with multiple keyways will be cheaper.
Bushings are typically used when fine tuning of cam timing is required for racing in a known RPM range.
Would still like to see some documentation that the cam was factory-installed retarded...
Bushings are typically used when fine tuning of cam timing is required for racing in a known RPM range.
Would still like to see some documentation that the cam was factory-installed retarded...
Last edited by billla; Jan 16, 2012 at 05:47 PM.
Le Mans Master
Joined: Mar 2008
Posts: 5,948
Likes: 72
From: Oxford MA-----You just lost the game!!!!
http://forums.corvetteforum.com/c3-t...long-post.html
Scott
Instructor
Joined: Jan 2012
Posts: 201
Likes: 0
From: some hole in the ground town- camp verde:) arizona
thanx. confusion came into play in that i've never herd of changin valve/camshaft timin n assumed it another name for the same thing. i must first be yung n stupid fore im old n wise. that fits me perfectly
Melting Slicks
Joined: Aug 2008
Posts: 2,200
Likes: 3
From: Lehigh county Pennsylvania
I don't understand why the services of a machinist would be required just to enlarge the hole in the cam gear to install these bushings? Perhaps if the only tools at your disposal were a claw hammer and wood chisel.
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Le Mans Master
Joined: Jun 2004
Posts: 6,231
Likes: 65
From: Seattle WA
St. Jude Donor '14
Regardless, wrong item for the application.
Le Mans Master
Joined: Dec 2003
Posts: 5,727
Likes: 38
From: Fremont CA
7t9,
I knew that turning the dissy would not advance the cam, so it looks like I will have to get a new timing chain set with adjustable keyways. It's a pity, as I just had the harmonic balancer replaced - the outer ring had slipped and I had to time it by ear.
I'll leave it alone for the time being, but will do this in the future, probably during winter (June-August). Thanks again for highlighting this.
Regards from Down Under.
aussiejohn
I knew that turning the dissy would not advance the cam, so it looks like I will have to get a new timing chain set with adjustable keyways. It's a pity, as I just had the harmonic balancer replaced - the outer ring had slipped and I had to time it by ear.
I'll leave it alone for the time being, but will do this in the future, probably during winter (June-August). Thanks again for highlighting this.
Regards from Down Under.
aussiejohn
John do yourself a favor and if you decide to play around with distributor advance springs, get an MSD distributior advance spring kit. All the other kits now seem to contain Chinese made JUNK parts. If your playing around with your 4 speed cars don't go too light on the advance springs, it is better to keep a medium spring in the distributor, you will hear detonation at lower RPM ranges when flooring the throttle when you have gone too light.
Here's a link to the kit you need: http://www.streetsideauto.com/p/msd-...GoogleShopping
Hows the Pro Stock project of Bruno's going? haven't talked with Bob since it was shipped off to OZ. Hope he's wearing some adult diapers when he launches it for the first time, I think he'll need them. 2.75HP per cu/in is pretty serious territory to play with.