DanZ28

iTrader: (5)

Does anyone know if the Comp-R plunger has the same height as a stock plunger? Do you need longer PR's normally for Comp-R's?

calongo_SS

iTrader: (7)

I don't know about longer push rods, but you'll need adjustable rockers with comp-r's.

DanZ28

iTrader: (5)

Yeah, I know thats the preferred way, but you don't have to have adjustable rockers with Comp-R's, there's other ways to get preload correct.

I mainly asking for someone else who has to much clearance (.025" slop) and was recomended to use longer than 7.400" PR's to get the correct preload.

This is with 64CC Patriot heads, stock MLS gasket, stock rockers, and 7.400 PR's. With this he has .025" clearance, no preload.

Dan

LS1 Swapper

You most certainly do not need adjustable rockers for comp-r's, just pre-load the lifters ~.050-.060" cold and be happy.

calongo_SS

iTrader: (7)

My apologies, it is not 100% necessary to have adjustable rockers, but it sure does make things easier.

LS1 Swapper

Just trying to keep the mis-info down, I bought my comp r's a while ago and when I searched for pre-loading I found mostly misinformation and confusing posts.

I've been running with that amount of preload for some time, and have experienced no issues. Nor do I expect any, engine is quite as can be, car pulls hard to 7k and I've run on the road course doing a lapping day without an issue.

ninobrn99

iTrader: (8)

how do you set the preload with the comp r's?

Bryan @ Speed Inc.

iTrader: (19)

1.25 to 1.5 turns past zero lash with the correct length pushrod.

ninobrn99

iTrader: (8)

and how do you determine what lash your at?

Bryan @ Speed Inc.

iTrader: (19)

spinning the pushrod under the rocker arm and tightening the rocker arm bolt until you get resistance. then do 1.25-1.5 turns past that. most likely you will need a pushrod length checker. it's kind of a tedious job but well worth it.

ninobrn99

iTrader: (8)

i though you just torqued them to 22 lbft though.

PREDATOR-Z

That is the trick though. With non adjustable rockers, you adjust preload with variating p-rod length. So some poeple just get the right cam (basecircle) for offshelf p-rods available, and by pure luck end up in the right margin.
Adjustable rockers is the way to go to have "true" proper preload adjustment on these.
But if you are choosing this lifter for anything under .600 lifts, you are waisting your money. Comp 850-16 is more than enough for the task, cheaper than stockers and much more merciful for preload adjustments.

PREDATOR-Z

Please expalin how YOU did that with non adjustable rockers.

Spinmonster

At what lift/spring pressure do you need to change from the stockers to comp r's or better? I am running .628 lift with cranes shimmed and after tuning I will be revving higher. (.592 and 1.8's)

Also some guys are bashing the comp r's. Did they have an issue? I've heard the rumors but does anyone have factual information?

Spinmonster

Wondering that myself.

If you install them from zero lash with the stock rocker mounting bolts it should be 1.25-1.5 turns till you get the 22lb TQ setting. To adjust from there.....???

PREDATOR-Z

That is done by different length push rods.
I just want to know how he adjusted non adjustables to read .060 cold????? Maybe there is some magic?

Unless it is just like I said, pure luck that the pushrod chosen fell within that margin with the base circle that his cam has.

PREDATOR-Z

This is a quote from Comp rep.




And this one;




Hope this clears the smoke.

DanZ28

iTrader: (5)

So, can anyone answer my question? Here goes again, does anyone know if the Comp-R's plunger has the same height as an OEM lifter plunger? I already know the pre-load specs and how to do it...

Dan

LS1 Swapper

Here we go again

https://ls1tech.com/forums/generation-iii-internal-engine/376522-lifter-question.html

Not interested in arguing again, in fact I'm not going to waste my time with this topic no skin of my ***.

I don't know what Brian is saying but if the lifter is pre-loaded cold(and hot) how is the circlip going to effect anything? With low preload, resulting in hot lash I could see an issue on the circlip.

I really think comp needs to spend a lot more time explaining their lifters, and these issues. If they have such a weak circlip/poor design then maybe it should be fixed. Or maybe people shouldn't be buying their products considering the lack of instructions and explainations provided by them.

Mine work just fine pre-loaded to as I've stated ~0.060", must be magic...

PREDATOR-Z

Swapper, I was just joking, but how did you adjust .060? Did you do that by shimming the stands? or custom p-rods?
You simply cannot adjust preload via nonadjustable rockers.
Also what is you cam? just out of curiosity?