one for the experts
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one for the experts
Hi guys.first I have plenty of engine knowledge .so please dont act like Im newbie,its aggrivating as hell.
My question is/If moving the drive gear one tooth advance whats the change in timing. 31 on small gear(engine) 62 on big(cams) hence the 2:1 ratio.weve had few discussions around shop.I say its 6 degrees per tooth,but take two roataions for ful 6 degrees so its 3 degrees( yea not exactly 6 but very close).buddy days no its 2:1 so its 12.Lets have a vote on whos right.I need the extra beer riding on out come,.
My question is/If moving the drive gear one tooth advance whats the change in timing. 31 on small gear(engine) 62 on big(cams) hence the 2:1 ratio.weve had few discussions around shop.I say its 6 degrees per tooth,but take two roataions for ful 6 degrees so its 3 degrees( yea not exactly 6 but very close).buddy days no its 2:1 so its 12.Lets have a vote on whos right.I need the extra beer riding on out come,.
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Joined: Oct 2007
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RE: one for the experts
I don't want to think this hard in the morning but off the top of my head I would say it is not going to be only 3 degrees or it would be a popular way to advance or retard your timing by only 3 degrees. there is a reason that advancing or retarding is not done this way. Later when I have my little brain warmed up I will sit down and figure it out LOL> I guess I really had no business responding to this as I am far from an expert.
Road Master
Joined: Jan 2008
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From: Mnpls MN
RE: one for the experts
ORIGINAL: wydopn231
Hi guys.first I have plenty of engine knowledge .so please dont act like Im newbie,its aggrivating as hell.
My question is/If moving the drive gear one tooth advance whats the change in timing. 31 on small gear(engine) 62 on big(cams) hence the 2:1 ratio.weve had few discussions around shop.I say its 6 degrees per tooth,but take two roataions for ful 6 degrees so its 3 degrees( yea not exactly 6 but very close).buddy days no its 2:1 so its 12.Lets have a vote on whos right.I need the extra beer riding on out come,.
Hi guys.first I have plenty of engine knowledge .so please dont act like Im newbie,its aggrivating as hell.
My question is/If moving the drive gear one tooth advance whats the change in timing. 31 on small gear(engine) 62 on big(cams) hence the 2:1 ratio.weve had few discussions around shop.I say its 6 degrees per tooth,but take two roataions for ful 6 degrees so its 3 degrees( yea not exactly 6 but very close).buddy days no its 2:1 so its 12.Lets have a vote on whos right.I need the extra beer riding on out come,.
Road Master
Joined: Dec 2006
Posts: 1,058
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From: Omaha Nebraska
RE: one for the experts
11.6crank degrees,5.8 cam degrees. Normally, if we state that we have advanced the cam by4 degrees, to be more "proper" it should have been stated, "we have advanced the cam by 4 crank degrees to avoid confusion.
Similarconcept but the other way around,with engines using an ignition distributor, if someone states, "we turned the distributorto advance the ignitiontiming by 4 degrees", they rotated the distributor 2 degrees to advance the timing 4 crankdegrees because the distributor, like the cam, rotates 1/2 degree per the crank's 1 degree.
Similarconcept but the other way around,with engines using an ignition distributor, if someone states, "we turned the distributorto advance the ignitiontiming by 4 degrees", they rotated the distributor 2 degrees to advance the timing 4 crankdegrees because the distributor, like the cam, rotates 1/2 degree per the crank's 1 degree.
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From:
RE: one for the experts
the cam gear has 62 teeth guys 360/62 equals 5.8 like i aid close to 6 .Ok screw therorys im out of here and to the shop time for degree wheel to be on motor.Was going to fire it up today but now Im more itnerested in proving how this works.besides whats one more tear down anyway.
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Intermediate
Joined: Feb 2008
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RE: one for the experts
as geargrinder said 11.6 degrees. The degree wheel goes on the crank, and cam timing figures are expressed in crankshaft degrees.In effect by moving the chain one tooth,you're changing the cranks relationship to the cam one crank tooth: 360 divided by 31=11.6
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Outstanding HDF Member
Joined: May 2007
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From: Florida
RE: one for the experts
You are figuring out a ratio between the two gears....don't forget it's the cam timing difference your looking for so you would have to measure the open and close of the cam lobe at .053 lift measured with a dial guage, then read your degree wheel at that point......I say 17 degrees for on tooth off.