Factory Retarded Cam Timing

[Turbo Performance]

Not the greatest picture but this is the engine out of my street rod. I've never had the cam out, I got the engine bone stock. Looks like the timing is one tooth retarded, probably from the factory. Anyone ever seen this? The 2 cam teeth dots should go on either side of the crank tooth dot right?

 

[TheBac]

Oops.

 

[OregonDMAX]

Besides the cam being retarted someone at the plant was too that day. :roflmao:

 

[Chevy1925]

Now the question is, how much power was that worth? Lol

 

[Bonestock]

You sure the timing gears have not been spun out of phase without being keyed?

 

[Harbin_22]

You sure the timing gears have not been spun out of phase without being keyed?

That's not going to change where the dots line up.

 

[Turbo Performance]

Now the question is, how much power was that worth? Lol

Works out to roughly 4.2* retarded. Has to be worth some overall power. Not sure that I'll ever know how much since I'm changing so many things now.

You sure the timing gears have not been spun out of phase without being keyed?

That's not going to change where the dots line up.

Agreed but regardless, cam pin was intact and not threatening to shear.

 

[NC-smokinlmm]

Whoops...:buttkick:

 

[Stingpuller]

That's not good

Check the valves good. I'm surprised it didn't have piston to valve problems with stock Pistons. It must have a fair amount of clearance.

 

[Fingers]

Works out to roughly 4.2* retarded. Has to be worth some overall power. Not sure that I'll ever know how much since I'm changing so many things now.





Agreed but regardless, cam pin was intact and not threatening to shear.

360/43=8.4degrees

 

[TheBac]

360/43=8.4degrees

Oh hell, what do you know anyways??

:roflmao::roflmao:

 

[Turbo Performance]

Check the valves good. I'm surprised it didn't have piston to valve problems with stock Pistons. It must have a fair amount of clearance.

I agree. Ran all last year this way. 3900ish RPM. Stock valve train. I imagine luck may have played a part in it living.

360/43=8.4degrees

My bad. I was talking cam degrees, 360/86= 4.18 degrees.

 

[Yellow Jacket]

Most likely should've gained HP but would've hurt spool up and bottom end(torque) performance...

Photo isn't working...

 

[Yellow Jacket]

Can you repost the camshaft to crankshaft gears photo?

 

[Turbo Performance]

Can you repost the camshaft to crankshaft gears photo?

Sorry I can't, it must have gotten deleted in a Photobucket/Phone clean out.

 

[Yellow Jacket]

Sorry I can't, it must have gotten deleted in a Photobucket/Phone clean out.

Looking from the front the 2 teeth were to your left(passenger side) of the crank tooth?

 

[Turbo Performance]

Looking from the front the 2 teeth were to your left(passenger side) of the crank tooth?

Yes, if I remember correctly. They were both behind the crank dot instead of one on each side.

 

[COMP461]

on the factory car there is not enough room for it to be off that much . The Duramax is the tightest of all diesels on cam clearance . But retarding the cam would leave the intake event open longer and open the exhaust event latter. This would theoretically allow more air on the intake and the later opening of the exhaust would have less pulse

 

[Turbo Performance]

on the factory car there is not enough room for it to be off that much . The Duramax is the tightest of all diesels on cam clearance . But retarding the cam would leave the intake event open longer and open the exhaust event latter. This would theoretically allow more air on the intake and the later opening of the exhaust would have less pulse

How does the intake event stay open longer with retarded cam timing? I guess I just assumed everything was happening later and that a full tooth would have just gave less intake fill time due to it happening late.

 

[clrussell]

How does the intake event stay open longer with retarded cam timing? I guess I just assumed everything was happening later and that a full tooth would have just gave less intake fill time due to it happening late.

Take whatever he posted an ignore it...


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