Hey guys

Building this 383 with a 200shot or so of juice. cam will be 230/236/112 .544.555 or a 230/242/112 .544/.578

right now i have stock lifters sitting in a box. However, due to all the metal that was in the motor, im pretty sure they are just filled with metal shavings gotta check em out tomorrow. so i was looking to get the comp r lifters.


what are the advantages of these., and what does anti pump up mean?

Also I have heard that some people have had problems with their R lifters? Any stories?

Lastly is there any break in required for a lifter? like soaking it in oil?

 

ttt

 

The comp r lifters are discontinued for more than a year.

 

I also heard they last 10-15k max. New stockers or cranes will be fine.

 

lol where have you been the past couple months, the R lifters are back

More opinions needed.

 

15k miles max.....hmmm for some reason i doubt that, or there would be alot of pissed off people. Any one who actually has these lifters with opinions?

PS: How do you clean lifters out?

 

All of the lifters are made at only a few factories in the world. Crane lifters came from the same place as the CompCams lifters or even the GM lifters. This is why, for a while, there were no aftermarket lifters available. One of the factories had problems (burned down???) and the OEM's were using all the available lifters on the market leaving the aftermarket companies with nothing. The lifter bodies, plungers, rollers, etc. are all identical and if installed properly the 'R' lifters should last as long as any other.

The cavity between the lifter bodies and plunger fill with oil, this is what makes the hydraulic lifters self adjusting. Oil flow in and out of the body is controlled by orifices and tight tolerances. The problem with hydraulic lifters and high RPM is that more oil can enter into the lifter than is bled out. The lifter than "pumps up", the results are the same as an overly tight lashed rockers, the valves hang open. The opposite can also happen on a worn lifter, more oil bleeds off than the lifter is supplied with and the lifter "collapsing" which results in a condition similar to excessively loose lash.

It is possible to clean your own lifters as well. To disassemble the lifter you simply need to remove the locks and retainers from the top, clean and inspect, and reassemble with new locks. Never having done this I don't know what kind of advice I can give The tolerances on the lifters are VERY tight and if much foreign material has entered into the lifter body you may have some lifters that will collapse under spring load.

The main difference between regular and the 'R' lifters is the retainer and locks used by CompCams. For this reason the plunger is set deeper with the 'R' lifters. Because of this you should lash the 'R' lifters *just* past zero lash and no further.

 

stock lifters are almost as much as the comp r right? at least the comp oem replacements are.

Guess the saying better safe than sorry applies here....

 

im gonna buy a set of the R lifters. dont feel comfortable attempting to clean those, and expecially putting those back the car!

 

I'd probably do the same thing, it may save you more time and money in the long run. Depending on where you buy them, the lifters should all be similar in price for the reasons I mentioned above (they are basically all the same!). Just keep in mind what I said about lashing the 'R' lifters. I'm lashing mine at about 1/8 turn past zero lash. I wouldn't go above 1/4 turn, if that.

 

last 15k miles? where did this come from?

prorobly somoene who cant adjust their valvetrain.


Aren't Comp R's rapid bleed down?
If they are, i wonder if low rpm cruising for exteneded time (ie 500mile trip at 65mph in 6th gear with 3.42s) would hurt it..

i highly doubt it though..


Comp R's are like $20 more and definatly a good think IMHO. I got them. I hope they fare me well

 

They are not rapid bleed down. You might be thinking of the lifters that bleed down so fast that they make very large cams livable at low rpm but "pump-up" at high rpm taking advantage of the large cam.... kind of like a simple VTEC I've been running 'R' lifters for some time now with zero problems

Just keep the lash down and all should be well.

 

fawk 3400 in debt now

So once zero lash is found, just a hair past it? Do they come with the instructions that tell that?

 

Does anyone make rapid bleed downs for us?

 

No instructions but I can tell you there's been a few people that treated them as "regular" lifters and had problems.

What I normally do is find zero lash, then tighten the poly lock with an allen wrench so it just starts to snug up, I then use a wrench to turn the whole assembly as tight as I can. This should give you ~1/8 turn past and positively locks the rocker in place.

I'm not sure if anyone makes that style for roller lifters. Regardless, a lot of the pros feel they are more gimmick than they are effective.