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My Lifters Are Really Noisy

Dave.TAS

By Dave.TAS,
in Engines & Forced Induction

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Dave.TAS Community Regular

Dave.TAS

Posted
Posted

Hey

I purchased an RB22 already built by Donny @ Streetforced, and was told it had noisy lifters and they needed to be changed. So i changed the lifters to some known good RB25 ones. I ran the engine for the first time and its all sweet apart from the rattles coming from the head.. Still.

It has CAMTECH 268 degree 9mm lift cams, with tomei type a valves springs. Im told it has 1.2mm oil restrictors fitted to the front and rear ports, and an N1 oil pump. As far as i can tell all/most of the lifters are noisy.

Before fitting the new (second hand) lifters i had them submerged in oil for a day. This has worked fine for me before with CA18s. Ive had it running for 10 minutes or so, with varying revs but no more than 2000. Oil pressure according to my cheap Racetech electronic gauge is 6 bar on startup, drops to 4 bar when warm, and raises to 6 bar again @ 2000rpm.

When i spoke with camtech before christmas they said the cams should be fine with stock lifters as base circle is unchanged, but i cannot confirm this not having measured. Cams where supplied to previous owner by STATUS and told would work with stock lifters.

Any advice would be great, wishing i had know it wasnt going to work properly before i put it in the car...

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Dobz Experienced

Dobz

Posted
Posted

1.2mm is too small for hydraulic lifters with bigger than stock cams. Hyd. lifters need good oil delivery to keep them pumped up and applying enough pressure to keep it following the cam properly. The lifter taps on the cam simply because it can't pump up quick enough to keep contact which also defeats the purpose of having a bigger cam because it won't be able to open as far as it should.

That being said 9mm lift cams are starting to stretch what hyd. lifters should do any way. IMO solid lifters would be the way to go.

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Dave.TAS Community Regular

Dave.TAS

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Posted

The first set of lifters that where in the motor from 0km were fully disassembled and cleaned prior to installation.

Easy enough to say convert to solid lifters. New cams 900 and solid lifters 500, plus labour. Wouldnt get much change out of 2 grand :(

Looking like lifters cant handle bigger cams when oil is restricted, or cams dont work with hydo's regardless of specification.

Dont really want to put standard cams back in it and Im really not keen on taking the head off to drill the restrictors out to 2mm

Anyone got any better ideas?

STATUS Grand Master

STATUS

Posted
Posted

hey the cams are fine we have used shloads.

i reckon your just unlucky with the combination of valve springs and restrictors, ive used the same restrictor combination with no issues on softer valve springs. i would swap out the resrictors before pulling cams and so forth... why compromise a killer engine (streetforced engines are well built and ive never had an issue with any on the dyno and ive had @ least 15 or 20 through) by removing cams etc... just swap out the restrictors.

JKR-32 Proficient

JKR-32

Posted
Posted

what oil did you soak them in? diesel oil works best to get the crap out of your lifters.... or convert to solid lifters.

Sorry to high-jack your thread mate, but I'm about to replace the lifters in my rb25det. How much stuffing around is involved in pulling apart and cleaning them properly? Or is it just as rewarding to simply soak them in diesel oil?

boostn0199 Grand Master

boostn0199

Posted
Posted

Sorry to high-jack your thread mate, but I'm about to replace the lifters in my rb25det. How much stuffing around is involved in pulling apart and cleaning them properly? Or is it just as rewarding to simply soak them in diesel oil?

If your gona clean them you cant just soak them in diesel oil and leave it at that, You have to physically take each one apart which has in total 4 parts and clean them all separately and dont mix them up make sure each one goes there certain valve. I found a nice write up that I followed let me know if your interested in it.

JKR-32 Proficient

JKR-32

Posted
Posted

If your gona clean them you cant just soak them in diesel oil and leave it at that, You have to physically take each one apart which has in total 4 parts and clean them all separately and dont mix them up make sure each one goes there certain valve. I found a nice write up that I followed let me know if your interested in it.

Hey mate, yes, I'm very interested. Was it incredibly time consuming or not to bad? I'm Hoping to start on the lifters in the next couple of days. If you could post a link it would be much appreciated :)

Cheers :cheers:

boostn0199 Grand Master

boostn0199

Posted
Posted

Well its kinda like with any repitive work since theres 24 the first few are always annoying and eventually you find tricks and its easy to do it. For me the cleaning was time consuming because I separated each one into its on group and cleaned them individually then dried and assembled. Ive attached the guide I used since I cant find the website but in the guide he mixes all the parts together then gives them abit of sanding to re surface them but I decided to keep them separate and in the same position so there was no need to re surface them.

Hope the guide helps.

clenaing lifters.docx

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