aftermarket non adjustable rockers with Comp R's....
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aftermarket non adjustable rockers with Comp R's....
Anybody successfully running like Harland Sharp, Yella Terra or other aftermarket non-adjustable rockers with Comp R's?? I'm just wondering if this can be done. I want to buy Comp R's but I don't want the expense of the shaft mounted adjustable rockers..... would this be too hard to set up? TIA
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Originally Posted by Brian@AP-Engineering
You will need diffrent pushrods since the lash on the lifters is diffrent. Some yella terras are adjustable by using shims under the pads.
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I have LS6 heads milled .015, custom 230+ comp cam and I will be using the HS rockers.... currently I have Manley 7.4 prods, I guess I'm wondering if I can get Comp R's to work with my current prods or if I need some 7.35's.....
I know it won't be PERFECT because of the non-adjustability, but I figure I should be able to get close..... hopefully.
I know it won't be PERFECT because of the non-adjustability, but I figure I should be able to get close..... hopefully.
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From what I understand - there are a few that have already installed the HS rokers with the Comp 'R's with no problems & needed no shims with std 7.4 pushrods.
Shims can be used if necessary under the HS rockers just like the YT's. I will be using PP 5.3L Stg2 heads with HS rockers, Comp 'R' lifters, 7.4 Manley PR's and a LPE GT2-3 cam. Of course, I'm having Mike @ RapidMotorsports work on my car - so if he can't do it, no one can!
Shims can be used if necessary under the HS rockers just like the YT's. I will be using PP 5.3L Stg2 heads with HS rockers, Comp 'R' lifters, 7.4 Manley PR's and a LPE GT2-3 cam. Of course, I'm having Mike @ RapidMotorsports work on my car - so if he can't do it, no one can!
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Originally Posted by 1QUIKWS6
From what I understand - there are a few that have already installed the HS rokers with the Comp 'R's with no problems & needed no shims with std 7.4 pushrods.
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Can you run the Comp Rs with the 7.4 pushrods, yes, BUT you may/ will damage the lifter and it will be noisy as hell. I did it for ~2500 miles. You need adjustable valvetrain or shims to get the preload to .002-.004. They have a preload spec for a reason. You wouldnt torque your lugnuts to 200 ft lbs, would you?
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Originally Posted by Country Boy
Can you run the Comp Rs with the 7.4 pushrods, yes, BUT you may/ will damage the lifter and it will be noisy as hell. I did it for ~2500 miles. You need adjustable valvetrain or shims to get the preload to .002-.004. They have a preload spec for a reason. You wouldnt torque your lugnuts to 200 ft lbs, would you?
How much preload does a stock rocker have on Comp R's torqued to the standard 22ft/lbs. with a 7.4 prod (assuming an average aftermarket cam with a smaller base circle)? If that is too much then I may need to go to 7.35's.... I just want to get it somewhere close so I don't do any damage like you mentioned.
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the Comp R's only require .002"-.004" preload..like counrty said they could be damaged with anymore than that..if you change pushrod length, that will in turn change your valvetrain geometry for the worse..it would be better to shim than change pushrod length
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Originally Posted by spectacle solutions
the Comp R's only require .002"-.004" preload..like counrty said they could be damaged with anymore than that..if you change pushrod length, that will in turn change your valvetrain geometry for the worse..it would be better to shim than change pushrod length
Any guys running the HS rockers and Comp R's measure their preload with no shims and 7.4 prods?
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I will be doing the HS rockers as soon as Nate gets them in. He assured me that this can be done and will be doing the installation. I will post the results on this once the install is done. This seems to be a big topic lately and I want to get this right as well .
I hope this is a good soluition for the Comp R setup.
I hope this is a good soluition for the Comp R setup.
#15
Doing the HS rockers will be exactly the same as the stock rockers...since they are non adjustable..you wil be putting between .030"-.050" preload on the Comp R lifters..so if you went to a shorter pushrod (7.35") you would have none..or even less than none preload..thats why it would be better to shim..most rods only come in .050" increments
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Originally Posted by spectacle solutions
Doing the HS rockers will be exactly the same as the stock rockers...since they are non adjustable..you wil be putting between .030"-.050" preload on the Comp R lifters..so if you went to a shorter pushrod (7.35") you would have none..or even less than none preload..thats why it would be better to shim..most rods only come in .050" increments
Guess I'll have to buy some washers from Home Depot.....
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Originally Posted by Steve Burger
I will be doing the HS rockers as soon as Nate gets them in. He assured me that this can be done and will be doing the installation. I will post the results on this once the install is done. This seems to be a big topic lately and I want to get this right as well .
I hope this is a good soluition for the Comp R setup.
I hope this is a good soluition for the Comp R setup.
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Any more than 0 to 10 preload and you will be picking up lifter parts out of your engine. The cup that the pushrod rides in is pressed in and not retained by a c clip. Once that is moved out of place with too much preload it cannot hold the internals in.
For less preload you have to do one of two things: shim the rocker to move the pushrod out of the lifter, or get shorter pushrods.
For less preload you have to do one of two things: shim the rocker to move the pushrod out of the lifter, or get shorter pushrods.
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Originally Posted by Brian@AP-Engineering
Any more than 0 to 10 preload and you will be picking up lifter parts out of your engine. The cup that the pushrod rides in is pressed in and not retained by a c clip. Once that is moved out of place with too much preload it cannot hold the internals in.
For less preload you have to do one of two things: shim the rocker to move the pushrod out of the lifter, or get shorter pushrods.
For less preload you have to do one of two things: shim the rocker to move the pushrod out of the lifter, or get shorter pushrods.
I guess I could get a set of custom p-rods, but shimming sounds easier than that.