Cam sprocket tooth count

Reply Subscribe

Thread Tools

Search this Thread

Aug 13, 2001 | 12:50 PM

farmpaw

Thread Starter

Junior User

Joined: Jun 2001

Posts: 73

Likes: 0

Cam sprocket tooth count

Does anybody have a cam drive gear set for a 400 laying around to give me the tooth count on the cam sprocket? I can go to a parts store and count them myself but this is easier.

Aug 15, 2001 | 11:00 AM

bubbaf250

Posting Guru

Joined: Aug 2000

Posts: 1,127

Likes: 3

From: (near) Denver USA

Cam sprocket tooth count

farmpaw,

I believe on the stock timing set, there are 36 teeth on the cam sprocket. Seems like the Cloyes set I installed on my 351M had 48 teeth on the cam sprocket.

BubbaF250

1980 F250 4x4 Custom, 351M/NP435/NP208/D44HD-TTB/D60-FF/3.55s 6750 GVW, Rust & White.

Aug 15, 2001 | 07:34 PM

farmpaw

Thread Starter

Junior User

Joined: Jun 2001

Posts: 73

Likes: 0

Cam sprocket tooth count

[font size="1" color="#FF0000"]LAST EDITED ON 15-Aug-01 AT 09:04 PM (EST)[/font][p][font size="1" color="#FF0000"]LAST EDITED ON 15-Aug-01 AT 09:03 PM (EST)[/font]

Thanks, Bubba.
My question about the number of teeth is to determine if I can "cheat" the retarded cam set by advancing the cam one tooth on the sprocket to make up for the detune. At 36 teeth that will give 10 degrees of cam or 5 degrees of crank. It's unclear to me if the design retard was 4 degrees of crank or 4 degrees of cam. If it's crank angle this method will give the equivalent of one degree of advance over straight up. It's also possible that I'm all wet.
Is the Cloyes a roller chain set?

Aug 16, 2001 | 09:48 AM

billp

Freshman User

Joined: Feb 2001

Posts: 40

Likes: 0

Cam sprocket tooth count

You're right, that'd be 10 degrees at the cam. But I think that's going to make 20 degrees at the crank since it turns twice the rate of the cam. I believe events are always measured in crank degrees and 20 is a lot. I thought about doing the same thing to save a few bucks but a timing set with the three keyways isn't all that expensive and the job's the same either way.

Aug 16, 2001 | 10:01 AM

farmpaw

Thread Starter

Junior User

Joined: Jun 2001

Posts: 73

Likes: 0

Cam sprocket tooth count

You're right about the 20 degrees, billp. That won't work. Cheapness prompted the idea but reality shot it down. Any idea what the keyed crank sprocket sells for?

Aug 17, 2001 | 07:57 AM

billp

Freshman User

Joined: Feb 2001

Posts: 40

Likes: 0

Cam sprocket tooth count

I bought an Edelbrock double roller timing set from Summit for mine. I think it was like $40-50. Like others have said you can probably just get a stock timing set for a '71 or maybe even just the crank sprocket for a '71. I don't know what that'd cost. Good luck.