L-98 double roller chain
Thread Starter
Drifting
Joined: Feb 2008
Posts: 1,267
Likes: 27
From: Texas
L-98 double roller chain
Im building a 383 for my 85 vette
and am going with a double roller timing chain and was wandering if i should advance or retard my timing at all?
retard=tq
advance=hp
at least thats what the package says
and am going with a double roller timing chain and was wandering if i should advance or retard my timing at all?
retard=tq
advance=hp
at least thats what the package says
Team Owner
Joined: Oct 2004
Posts: 35,065
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From: Bergen County, NJ Democrats, doing for the country what they did for Michigan
Put it at stock, don't screw with it.
Thread Starter
Drifting
Joined: Feb 2008
Posts: 1,267
Likes: 27
From: Texas
Race Director
Joined: Jun 1999
Posts: 14,924
Likes: 9
From: Merritt Ils Fl
If you look at your cam card I'll bet the cam is ground +4. It is a very common for the grinder to do this since most cam buyers select a cam that is too large. Install it straight up. If you are looking for the absolute max for an almost pure race engine degree it in with the correct keys.
Drifting
Joined: Feb 2003
Posts: 1,978
Likes: 2
From: San Antonio Texas
Burning Brakes
Joined: Jul 2006
Posts: 1,080
Likes: 2
From: Pittsburgh PA
well my cam has 1 degree advance ground in and was suppose to be 108 intake centerline installed. Lined up the dots on the timing chain and degreed it... it was retarded 2 degrees so i moved it back 2 with my timing set that has 9 keyholes.
got it back where it should be. Installing straight up using dot to dot doesnt always give accurate results, so its best to degree it. Kind of a PITA but its best to know where your cam timing is at
got it back where it should be. Installing straight up using dot to dot doesnt always give accurate results, so its best to degree it. Kind of a PITA but its best to know where your cam timing is at
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Advanced
Joined: Nov 2006
Posts: 66
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From: Kempner TX
Some may not buy into this, but the engine that won the Engine Masters Challenge made best all-around torque and HP with the cam advanced eight degrees.
Cam was ground on 106 and installed at 98.
Following the timing card is probably the best way to start, but it's only a starting point. Depending on the results you get with it set that way - ground, on say 112 and installed at 108, (which'll account for the 4 degrees many times ground in by the can maker) -, you may want to tweak that setting down the road.
My XFI was ground on 113 and installed at 109 - per the card - but I'd planned to move it to 106. As long as your piston to valve isn't critical, you can play around with the setting until you hit the one you like best.
Jake
Cam was ground on 106 and installed at 98.
Following the timing card is probably the best way to start, but it's only a starting point. Depending on the results you get with it set that way - ground, on say 112 and installed at 108, (which'll account for the 4 degrees many times ground in by the can maker) -, you may want to tweak that setting down the road.
My XFI was ground on 113 and installed at 109 - per the card - but I'd planned to move it to 106. As long as your piston to valve isn't critical, you can play around with the setting until you hit the one you like best.
Jake
Drifting
Joined: Feb 2003
Posts: 1,978
Likes: 2
From: San Antonio Texas
Way back... some would advance or retard the Cam a few degrees... turn the motor over while checking which setting made the most compression. They would set it there. I don't know for sure if this method is still used, or how effective it is.
Thread Starter
Drifting
Joined: Feb 2008
Posts: 1,267
Likes: 27
From: Texas
like i said i have no idea what the cam numbers mean
and im just leaving it at the stock setting
i plan on a heads/cam swap eventually so then ill play with it some
just want it running right now
and im just leaving it at the stock setting
i plan on a heads/cam swap eventually so then ill play with it some
just want it running right now