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Old 09-29-2016, 06:49 PM   #41
dmigz57
 
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I ran a No Limit MFG cast cam and 13mm this year with no problems. It's actually a stock 24v cam that Eric re ground for me.
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Old 09-29-2016, 08:54 PM   #42
Inbred Inline
 
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Quote:
Originally Posted by jasonc View Post
What brand cast cam was it, anyone had a Hamilton break?
Mine is a Hamilton cast
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Old 09-29-2016, 09:07 PM   #43
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Joining this club. * Fingers crossed.
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Old 12-09-2016, 08:26 PM   #44
98 12valve man.
 
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Maybe my heads in a fog right now , but can someone tell me what running a 13mm pump has anything to do with snapping cams? I can understand if your talking about spinning high rpms (4500+) for sled pulling, but drag racing and getting up to 4K rpms during shifts at max, I can't see how it would have any affect on breaking a cam?
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Old 12-09-2016, 09:12 PM   #45
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Takes more effort to pump more fuel , the angle of the factory gear teeth pushes the cam to one side cast don't flex well
 
Old 12-10-2016, 08:00 AM   #46
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The post from Zach a few pages back explains the stresses on the cam, but not why so much.

Every lobe on the cam, every stroke of the pump, every piston stroke and every time a tire hits something is a change in the inertia of the power train. Each time this happens, the change in rotational speed has to be absorbed somewhere. If a component isn't strong enough to transfer that force (dissipate it) stress risers in that component (Zach post) will cause enough force to overload the part, and it will fail.
With a large injection pump comes high(er) torsional load, and if the inertia changes like some of these guys described, the energy has to go somewhere.

I'll probably get my ass handed to me for this, but it's what I think I know.



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Old 12-22-2016, 04:42 AM   #47
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Quote:
Originally Posted by 98 12valve man. View Post
Maybe my heads in a fog right now , but can someone tell me what running a 13mm pump has anything to do with snapping cams? I can understand if your talking about spinning high rpms (4500+) for sled pulling, but drag racing and getting up to 4K rpms during shifts at max, I can't see how it would have any affect on breaking a cam?
I am the OP.. My 1-2 ahift is around 5,500rpm and after that it's around 4,900rpm. I am tearing this motor down to go bigger with a billet cam (230/240) and try to keep alive. For anyone curious my setup worked great with a cast cam/13mm p&b pump and I ran the billet scheid cover with the bearing for the nose of the cam.
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Old 12-22-2016, 06:16 AM   #48
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Are you winding the truck in your sig that high between shifts.
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Old 12-22-2016, 08:04 AM   #49
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Quote:
Originally Posted by Drothgeb View Post
Are you winding the truck in your sig that high between shifts.
I saw the OP's truck in action at Woosley's back in May. And he has stated above, yes, he is winding his '92 that high between shifts.
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Old 12-22-2016, 08:38 AM   #50
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Quote:
Originally Posted by Levi_plummer View Post
I am the OP.. My 1-2 ahift is around 5,500rpm and after that it's around 4,900rpm. I am tearing this motor down to go bigger with a billet cam (230/240) and try to keep alive. For anyone curious my setup worked great with a cast cam/13mm p&b pump and I ran the billet scheid cover with the bearing for the nose of the cam.


Are you running better tires yet ?
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Old 12-27-2016, 11:19 PM   #51
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Are you running better tires yet ?
Not just yet.. I am planning on building a 96 I just bought. It will get coilovers on all four corners with a single leaf rear and caltracs. Logan Yelton and Tim Wright will be doing all the chassis work and the engine and transmission work I don't do. I plan to put it on a 30" slick then. I also have a schedule runner and O/S valves for the head. It will keep a wet block for street ability. Planning on an sxe88 and up in the air on modified non intercooled pistons or weisco's.
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