Duramax Diesels Forum Truck of the Week
  #16  
Old 10-24-2014, 06:06 PM
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I am not sure if it is a symptom or a contributor.

The actual push-pull on the cam gear and thus the crank is about 200 lbs. I will need to put a crank on the press to see what the deflection is under axial load.
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'04.5 EC/LB 4x4.
Howard Rods w/ oiler hole.
Oval Chambers and valve reliefs cut in Mahle Cast Pistons. 17.5:1
SoCal Stage 2 heads, 3388 Cam, Billet Flywheel, and harmonic balancer.
Danville 68mm VVT Turbo
100 over injectors.
PPE Dual CP3s
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100 PSIA MAP Sensor
Kennedy dual lift pump.

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  #17  
Old 10-28-2014, 11:13 AM
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just thought of this but what about the added load of the water pump and CP3 connected to the cam gear?
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  #18  
Old 10-29-2014, 04:01 AM
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Those are loads that would not contribute to the shearing of the cam pin, but are loads on the cam gear itself. So they would be in addition.
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But.....What do I know.

'04.5 EC/LB 4x4.
Howard Rods w/ oiler hole.
Oval Chambers and valve reliefs cut in Mahle Cast Pistons. 17.5:1
SoCal Stage 2 heads, 3388 Cam, Billet Flywheel, and harmonic balancer.
Danville 68mm VVT Turbo
100 over injectors.
PPE Dual CP3s
ProFab Castflow headers and uppipes.
100 PSIA MAP Sensor
Kennedy dual lift pump.

Dynoed 690 HP / 1200 TQ
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  #19  
Old 10-29-2014, 05:23 AM
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rickaveryjr rickaveryjr is offline
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This is pretty interesting. Typically straight gears are weaker than helical simply due to the fact that there is less contact area for the same size gear. They are also much louder than helical gears at higher speeds. The problem with helical gears is the axial force (thrust) when loaded. There is also a force trying to separate the gears at that point. Could the uneven loading/unloading from the cam have something to do with resonation at a certain frequency? I don't know. Maybe that was a thought for the CRANKS thread
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  #20  
Old 10-29-2014, 11:36 AM
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Quote:
Originally Posted by rickaveryjr View Post
This is pretty interesting. Typically straight gears are weaker than helical simply due to the fact that there is less contact area for the same size gear. They are also much louder than helical gears at higher speeds. The problem with helical gears is the axial force (thrust) when loaded. There is also a force trying to separate the gears at that point. Could the uneven loading/unloading from the cam have something to do with resonation at a certain frequency? I don't know. Maybe that was a thought for the CRANKS thread

Actually, spur are stronger. Especially stub spur. Helical only have a small portion of the gear faces in contact at any given moment. Helical are quieter however because the gradual engagement along the gear face.

The axial thrust from the helical depends on the angle of the helix. In the case of the cam gear, it is about 10% of the loading on the gear teeth.

I think the loading on the cam gear is a clue to the axial loads being applied to the crank. Whereas the crank can easily handle 50,000 lbs of radial force from the connecting rods and the resultant torque. The failure and fatigue point from axial loads is much smaller.
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But.....What do I know.

'04.5 EC/LB 4x4.
Howard Rods w/ oiler hole.
Oval Chambers and valve reliefs cut in Mahle Cast Pistons. 17.5:1
SoCal Stage 2 heads, 3388 Cam, Billet Flywheel, and harmonic balancer.
Danville 68mm VVT Turbo
100 over injectors.
PPE Dual CP3s
ProFab Castflow headers and uppipes.
100 PSIA MAP Sensor
Kennedy dual lift pump.

Dynoed 690 HP / 1200 TQ
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  #21  
Old 04-14-2015, 01:58 PM
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Have you come across any issues with the thrust collar galling and cracking from cam gear thrust. I help out with a pulling truck that had these issues. We ended up intalling a torrington bearing between the cover and cam bolt to end the problem.
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  #22  
Old 04-15-2015, 08:09 AM
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I've seen several, but have not made a correlation between cam design, hp or anything.
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But.....What do I know.

'04.5 EC/LB 4x4.
Howard Rods w/ oiler hole.
Oval Chambers and valve reliefs cut in Mahle Cast Pistons. 17.5:1
SoCal Stage 2 heads, 3388 Cam, Billet Flywheel, and harmonic balancer.
Danville 68mm VVT Turbo
100 over injectors.
PPE Dual CP3s
ProFab Castflow headers and uppipes.
100 PSIA MAP Sensor
Kennedy dual lift pump.

Dynoed 690 HP / 1200 TQ
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  #23  
Old 04-15-2015, 10:15 AM
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Me neither. My puller never had issues with thrust yet his did.
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