Cam advance gear
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Road Master
Joined: Feb 2014
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From: TN
Cam advance gear
While looking at the cam advance gears for twin cams, I noticed that Woods has one for the cam ($125) and Andrews has one for the crank ($54.05) and is reversible either +4 or -4 deg. Would one install the Andrews on the -4 deg on the crank to advance the cam?
Thanks for the help
Thanks for the help
HDF Community Team
Joined: Jun 2006
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From: san antonio
While looking at the cam advance gears for twin cams, I noticed that Woods has one for the cam ($125) and Andrews has one for the crank ($54.05) and is reversible either +4 or -4 deg. Would one install the Andrews on the -4 deg on the crank to advance the cam?
Thanks for the help
Thanks for the help
Last edited by djl; May 18, 2014 at 10:53 AM.
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Road Master
Joined: Feb 2014
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From: TN
That is where my confusion lies. When the gear is installed with +4* does it make the adjustment of moving the cam timing forward or is it based on the crank position. I maybe overthinking this, lol. Just want to make sure that the Andrews does advance the cam timing not the crank. In my reading Andrews makes the Woods advance gear but it is pricy.
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Road Master
Joined: Feb 2014
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From: TN
Senna thanks, I am not sure I understand this thing. My thought is that the cam operation would be initiated 4* earlier in the sequence thus building a little more compression and torque. If the crank is moved 4* in advance the the cam sequence begins later thus losing some compression and low end torque. I could be misunderstanding this whole thing. Andrews might have machined the the sprocket so it drives the cam sequence to move earlier in relation to the crank position. Again thanks for everyone's help, I'll try to give Andrews a call to make sure my understanding is correct.
Warren
Warren
HDF Community Team
Joined: Jun 2006
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From: san antonio
You have it right. Retarding the crank 4* is the same as advancing the cams 4* and visa versa; corrected CR and CCP are inreased which will move the TQ curve about 250-300 rpms to the left. Just the opposite will occur if the crank rotation is advanced 4*.
In one case the intake valve closes 4* earlier ABDC capturing a larger volume of A/F which increases compression. In the other case the intake closes normally, however it the crank rotation is retarded 4* the piston passes BDC 4* later and the same thing happens; larger volume of A/F is captured.
In one case the intake valve closes 4* earlier ABDC capturing a larger volume of A/F which increases compression. In the other case the intake closes normally, however it the crank rotation is retarded 4* the piston passes BDC 4* later and the same thing happens; larger volume of A/F is captured.
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Road Master
Joined: Feb 2014
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From: TN
DJL thanks for the help. It get confusing when when you have two products that do the same thing, but are assembled on different parts of the engine. Andrews was pretty smart engineering the dual purpose gear, especially for less $$$.
Thanks again
Thanks again
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