timing degree
Race Director
Joined: Mar 2001
Posts: 11,322
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From: Living in the Hartland
Originally Posted by kettererhouse
Can any of the engine guys tell me what each crank gear tooth equals in timing degree? thanks for any help! Michael k
Last edited by Fevre; Jul 25, 2005 at 09:47 AM.
Melting Slicks
Joined: Apr 2004
Posts: 2,083
Likes: 2
From: Montreal Qc.
I got one hanging on the wall right next to me (small block). 18 teeth so 20 degrees per tooth. Remember the crank turns twice for every turn of the cam/distributor so divide by 2 for timing degrees.
Thread Starter
Instructor
Joined: May 2004
Posts: 200
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From: Weaverville NC Sit down, shut up, & hold on!
Thanks guys, thats too easy, I feel stupid. 
My engine just came off the dyno and was not producing the power that it should have, being every thing was new- it came down to mechanical timing. as you watched the #1 piston at (what should have been) ^TDC and timing marks set TDC on the timing chain points, the piston would raise about 1//16 inch or so!
I pulled the crank gear and reset the crank gear and cam timing marks .
Now when engine is rotated from TDC the #1 piston sits (tdc) for about 3 teeth (crank gear)on rotation before dropping down ( as it should) The motor was retarded 1 crank gear tooth and it was fighting its self. I hope that this was a HONEST mistake on the short block builders part! as the short block has a guaranty and that would keep the motor from ever making an over rev! IT COULD NOT rev over 5800-5900 on the dyno and was only getting 390 HP at 16* advance timing with a MSD electronic distributor!
My engine just came off the dyno and was not producing the power that it should have, being every thing was new- it came down to mechanical timing. as you watched the #1 piston at (what should have been) ^TDC and timing marks set TDC on the timing chain points, the piston would raise about 1//16 inch or so!
I pulled the crank gear and reset the crank gear and cam timing marks .
Now when engine is rotated from TDC the #1 piston sits (tdc) for about 3 teeth (crank gear)on rotation before dropping down ( as it should) The motor was retarded 1 crank gear tooth and it was fighting its self. I hope that this was a HONEST mistake on the short block builders part! as the short block has a guaranty and that would keep the motor from ever making an over rev! IT COULD NOT rev over 5800-5900 on the dyno and was only getting 390 HP at 16* advance timing with a MSD electronic distributor!
Thread Starter
Instructor
Joined: May 2004
Posts: 200
Likes: 0
From: Weaverville NC Sit down, shut up, & hold on!
Originally Posted by Star79
I got one hanging on the wall right next to me (small block). 18 teeth so 20 degrees per tooth. Remember the crank turns twice for every turn of the cam/distributor so divide by 2 for timing degrees.
Thanks now it really make sense! i did not factor in the two rotation factor trying to make sense of the 16* w/ the MSD thats suppost to add another 4* advance,
20* minus 10* for the gear tooth makes about 10-12* with the gear set back right! You guys are good!
