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Author Topic:   Oil Restrictors with Hyd. Cam?
Dirt Maniac

Total posts: 174
posted November 26, 2002 07:09 AM
A reputable engine builder in this area was advising me to install oil restrictors in the back of the block; the ones that reduce the oil to the rockers and valve springs. We always used these when we used to run roller rockers, but now we must use only stamped steel, stock rockers and consequently did away with the restrictors because I know that the stock rockers need lube and the springs get "cooled" by the oil hitting them. When I told him this, he said that he modifies them to restrict less oil than normal. I don't know if I feel comfortable with this. What do you guys think?

Dirt Full Roller

Total posts: 69
posted November 26, 2002 08:03 AM
If you run restrictors on a hyd. cam, you will not get enough oil volume to keep all 16 lifters pumped up. Not to mention spring and rocker cooling issues. Can the restrictors with a hyd cam. Your engine builder must think you are going to fun a solid lift flat tappet cam.

redneck bubbas racing
Dirt Freak

Total posts: 213
posted November 27, 2002 07:06 PM
I have seen the restricters drilled out some so they would flow more. I still don't think I would run them with a hydralic cam but it has been done.

Dirt Full Roller

Total posts: 32
posted November 27, 2002 09:07 PM
i may be missing something here but it says you have to run stock rockers not stock cam. are you running hyd or solid lift cam? if it is a solid lift cam then yes run the oil restrictors

Dirt Maniac

Total posts: 106
posted December 02, 2002 06:54 AM
you can't use restrictors with fulcrums on your rockers or they will get hot from not enough lube.Why do I know-- 1 set of comp roller tip rockers in the trash after 7 races.they were blue in the fulcrum area.Most cam mfg.say absolutely no restrictors at all.Do what you want but restictors caused nothing but problems in my motor.Last year no restictors no problems.I run a solid cam

[This message has been edited by dirtracer7 (edited December 02, 2002).]

Dirt Maniac

Total posts: 174
posted December 02, 2002 08:55 AM
You guys backed up my thoughts. I think I'm going to thank the guy for his input but not run the restrictors anyway. I've seen stock style rockers get blued because of high heat before, so I don't need to add to the problem. Besides, I don't think we'll have an oiling problem since, we don't run over 6500 rpm and we use a good oil pan. Never had problems before.

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