SR20 Re-Shimming

[Options13]

I am finding TONS of mixed shit on weather an SR needs to be RE-shimmed or not with Hydraulic lifters..?

I didn't re-shim mine at all, and my shim are probably from another sr anyway, I was told that HLA don't need to be shimmed as they are self adjusting..

Either way, i had a track day yesterday, and my car threw a shim after the 4th lap, and i'm not on an aggressive rev limiter... (power fc @ 7500 rpm)

I am also noticing some un even wear on some of my cams ?

Heres the shim i threw...
https://scontent.fsnc1-1.fna.fbcdn.net/hphotos-xtp1/v/t1.0-9/1929771_10153273714816657_2298347143628879551_n.jp g?oh=b6376712765c3b806b37be51658814f5&oe=57494A2B

This is just another cam lobe, that has un even wear marks on the bottom..?
https://scontent.fsnc1-1.fna.fbcdn.net/hphotos-xpt1/v/t1.0-9/12495220_10153273714876657_5525327628140219734_n.j pg?oh=f38f13c080f4d8b458aec4d543224877&oe=57468C80


Could this have happened because my head isn't properly shimmed?

I'm running BC titanium retainers, with BC springs, and tomei 260 cams w/ 12mm lift, along with tomei rocker arm stoppers..

damn sr's ..

[Croustibat]

Set your rev limiter to 7000 and bin the rocker arm stoppers (i promise you'd rather throw a rocker than have it stuck in place because of them; when stuck, you can kiss you head, pistons and camshaft goodbye) , job done.

[ANDY black s13]

SR rocker needs to be shimmed so rocker is flat to cam lobe,
the wear pattern tells me it's not currently
the shims are sized in a 1 mm range approx 12 sizes iirc
either buy new from nissan if you can? or rob shims from another SR head
and hope you have sizes you need
a dial guage can help with setting up the rocker heights/get them equal/level

[Dboyizmlg]

I recommend dual rocker arm guide conversion.

[Options13]

I am also currently running these lifters

http://store.intecracing.com/sr20det-vvl-lifte21.html

should i keep running these or should i go back to stock lifters?

Also if they aren't bled properly can that cause problems? i was told lifters don't self bleed.

[cotbu]

Even if they are bled properly that can happen. If your spring somehow gets stuck or the valve it can happen. Yes you should bleed the lifter prior to install and for maintenance.

Correct they are not self bleeding.

Ive been running stock stuff to the max for years, lifters were not an item i figure needed upgrading or replacement as long as they're not seized.

Building and engine doesn't mean aftermarket parts that fit. It means, parts that work! Best built engines, have parts it that work the best together.[emoji41]

Sent from my SM-N910T3 using Tapatalk

[Options13]

I also have almost a rattling sound in my head somewhere... I'm not quite sure what it is?

I think maybe its a rocker arm hitting on my Rocker Arm stoppers? The noise is really noticeable on cold starts, and is more quiet when the engine is all warmed up. You can also hear it while driving, 2500-3500rpm on light throttle, it doesn't make the noise on accel or decal. Its quite annoying also.

Here a video of cold start and me playing with the throttle.

https://www.youtube.com/watch?v=e3RXNpdQ11k

either way, I am going to probably put stock lifters back in, and remove the rocker arm stoppers, and shim my head properly...

[jr_ss]

Shimming, as stated, is to get the rocker pad(the one the cam rides on) level to the lobe itself. It doesn't have anything to do with taking up the amount of free play(air gap) between the lobe and rocker.

Get your head shimmed right. Pull all the lifters while you're at it and bleed them. A small Allen key and submerging them in a small cup of oil to remove air works best, usually. The lifter needs to remain upright after you've bled it, so the best solution is to remove one at a time, replacing them back into the head as you go.

[Options13]

i'll go ahead and do that, and whats your opinion as far as removing the Rocker Arm Stoppers? I feel like in my case i would of been better off if it threw the rocker, since it stayed it damaged my retainer, and chanced dropping a valve..

Any clue on the rattling noise in my head also?

[jr_ss]

That's what happens when you run rocket arm stoppers. They don't allow the rocket to clear when it's tossed.

Rattling noise could be the chain, tensioner or guides. It could even be a lifter not bled properly.

[e1_griego]

That's what happens when you run rocket arm stoppers. They don't allow the rocket to clear when it's tossed.

Rattling noise could be the chain, tensioner or guides. It could even be a lifter not bled properly.


This is what I've been telling him but he doesn't believe me.

[jr_ss]

This is what I've been telling him but he doesn't believe me.

It would be wise too... You're not new to the scene or SRs...

[Options13]

i'm going to re-shim my head properly, remove RAS, and go back to stock lifters.

I'll check back in once i have done that.

Thanks guys ;)

el_griego has been causing me havoc for years now.

[shinhed]

Any new developments?

[Tyler_240]

There is another thread where he asked about the dual guides, and mentioned afterwards he still threw a couple rockers.

I'm currently working on the dual guide, just waiting on my parts to arrive. I tossed a shim with normal daily driving on stock springs, etc...

I've found a lot of folks have issues because of installer error. So when you read about the "dual guide" not working, maybe it didn't or maybe there was another underlying issue...jus sayin

My motor sat for 5 years in a storage unit and the previous owner is nowhere to be found. I expected some issues, and if you look at my posts, i've had quite a few due to the previous owners lazyness and incompetence.

EDIT: With that said, according to option's posts, he definitely needed to check tolerances considering he was running different springs, retainers, cams and lifters. If he mixed up his shims or guides, that could be part of the problem. This post explains everything very well http://www.nicoclub.com/archives/how-to-build-a-9000-rpm-sr20det-head.html

If you go dual guide, based on my research, and I could be wrong, but you do not need to check clearance if you are on factory valvetrain because the guides are all the same size ~3mm