Type_O_Negative_1320

When I was swapping out my opti this past weekend, I also installed my new Comp R lifters, pushrods, and 1.7 rockers. I had a buddy of mine adjust them for me since I didn't want to risk it (I've never adjusted rockers before...he's done it about a million times).

These things are noisy...I'm wondering if we set the preload on the lifters correctly. We tightened the rocker nut down by hand until the pushrod no longer moved up and down (but still spun freely), then turned down the set screw, then gave the set screw and rocker nut a quarter turn to lock them down. Is this the proper way to do it with Comp R lifters? I've heard they're pickier than other lifters about getting the preload set correctly.

xxsaint69x

1/4 pass lash max...as little as possible after 0 lash.

truedualws6

If you went from stock rockers to the 1.7s then
the noise is probably from the rockers, assuming
that you set the lash correctly.

The lash setting is a topic for a short story. TPIS
likes lots of preload (like 1 to 1.5 turns), some
like very little (like 1/4 turn). I have mine set to
1.25 turns now and have had no problems at all.
When I install my Comp-Rs I will probably shoot
for 3/4 turn.

jonaddis84

1.25! Damn, I think your valves are probly stickin open man, Ive never ever heard that much preload before, the most I would ever load an OE type hydro lifter is half turn. Rs are as close to 0 as possible like xxsaint69x said, they are basically solid lifters once they pump up, I'd probly go 1/8th turn on Rs, but youd be fine on a quarter I think, its probably the rockers, they are quite noisy.

WS Sick

If I understand you right I think youre only 1/4 turn actual after "0" lash. that should be fine, as said before the extra valve noise is most likely the roller rockers, I have yet to see a set of Roller rockers that didnt make at least a little noise.

zx1216

Wow!! i wouldn't go anymore than 1/2 turn, more like 1/4 turn.

Type_O_Negative_1320

You're exactly right...1/4 turn after "0" lash is what we set them at. I was hoping these rockers would be a bit quieter than my 1.6 LT4 rockers since these are non-self aligning, but I guess not. They're a little worse than the LT4 rockers were. I've also been told that the Comp R lifters add some noise too, so that may also be it.

WS Sick

I have the comp roller rockers and they made some noise, I later added the comp R lifters and the noise only increase maybe slightly, could just be me though.

ibanez6rg

I thought the Comp Rs were supposedly quiter than stock.

shoebox

When I recently switched to the Comp R's, I found the total number of turns to bottom them out was ~1¼ (I did not check it, but I bet stock lifters have more travel). You really don't want to go more than half of that and you can also run them looser. ¼ to ½ is a good preload for them, IMO.

Oh, I also found them quieter than the stock type I was using. I think my springs may have been overwhelming the stock lifters.

Type_O_Negative_1320

My springs were killing my stock lifters...that was the main reason for switching to the Comp Rs. I have a set of K800s on there from when I was running my old cam (Crane cam comparable to the GM 847). Spring pressure is 155# @ 1.850" closed and 450# @ 1.150 open. The OEM Crane lifters I was running didn't care for those pressures at all.

I think I'll have my buddy readjust them tonight while they're still warm...maybe that will quiet them down a bit. If not, I guess it's time to start looking for another set of valve covers to shut them up. People tend to look at you funny when it sounds like a swarm of cicadas under your hood.

shoebox

Impress your friends with a "Cicada Powered" sticker on the bumper.

truedualws6

I would think if it was hurting power I would not make the
numbers considering all I have is a bolt-on car. There is lots and
lots of discussion on this topic as well as dyno work. I would
like to set the lash at 1/2 and do a dyno run for comparison but
don't want to spend the $$$. The stock lifters have more lash
range than the Rs. I will try to remember to measure the stock
lifters when I do the cam swap in a couple of months.

DR.ZED

Comp Rs soaked in German 0w30 castrol, set to 1/2 turn past 0 lash when I installed them.

I could have gone more, quite easily it appears. :0

1loudz

you sound you did almost the exact things that i did over winter break. lol. i swapped out my opti, WP, switched to Comp R lifters from stockers, switched to 1.7 scorpions from LT4 1.6's, C612 springs from LT4 springs, etc.....

i can honestly say the same thing, its just as loud, if not louder than the LT4 S/A setup. i set for 1/4 turn past zero lash, and it was so loud i thought they were way too loose, so i did it again and set it for 1/2 past, and theyre just as loud. i guess its just the way this setup sounds. ive got probably 1000 miles on it with no problems, it runs strong as hell, only lost by a car length to a TA w/ a 230/236 and stage 2 combo heads. id say just make ur exhaust louder and drown it out! lol