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RB26 camshafts in RB20??

bbenny

By bbenny,
in Engines & Forced Induction

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WazR32GTSt Grand Master

WazR32GTSt

Posted
Posted
Ok WTF is going on,are people putting the cam cap thingys on backwards (I don't mean you Roy)  

WazR32GTSt has his running,did you use the GTR cam caps?

g'day mate,

the only thing that was used from a GTR was the cams themselves (unless my mechanic put something else in and didn't charge me for it! - not likely...)

Waz.

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TurboX Mentor

TurboX

Posted
Posted

Hey arch, you need to read the whole thread to find the link to the list of cams and differences -somewhere in there near front.

This is an interesting thread if you have an RB20DET as I have and modifiying looking for 250AWkws.

Seems some have had probs ( Binding Inlet) and some have been fine (Sydneykid)

SK has come up with the likely answer in maybe they are slightly bent!

It seems to be possible but has anyone checked their cams -BBenny? Waz?

It worries me that I cooked the motor at Calder as well, but the Head guys said its OK and straight but not sure I want to put the old cams back in now.

I want to do this mod as I have just done extensive work on the head and it sounds like if it works it makes some great power, BUT I am not sure on the Idling probs either that some have had after fitting.

I have a mod ECU as well which could complicate it further. Maybe going Power FC.

Sydneykid, do you have any suggestions on the best suited cams that wont bind up with too much lift in the RB20 as there seem to be many dif specs of RB26?

Also considering your info on the Chev, is there mods to improve the followers like drill larger/more oil holes or maybe chamfer etc?

Roy Grand Master

Roy

Posted
Posted

My inlet cam will be visiting a machine shop, just to see if it is bent and the cause of dead engine...expensive lesson. When buying 2nd hand internals, get them checked before bolting them in....my concerns are over Australia Posts handling of them...but thats not confirmed, just a suspicion looking at the cam and the journals when it all came out.

For now my daily driver is staying just that, no more mods on my R32...start banking my money for something with big Hellas that belts thru the forest in the dark!!!!

  • 10 months later...
Mr GTS4 Mentor

Mr GTS4

Posted
Posted

ok to bring this thread back. was anyone else tryed installing gtr cams in rb20 since the 12/08/04??? and made it work on the standard ecu?? another question. can you use the rb20 cam gears with the gtr cams installed?? or do you need the gtr cam gears?

Roy Grand Master

Roy

Posted
Posted

Even ppl with a PFc have not been able to get them to work:(

Bin the idea, unless yuo are doing it yourself and you are confident nothing is going to go wrong, in which case its just a waste of your time, but be interesting to hear from someone that gets it to work...

But, be warned little things like seized bolts in cam cap/journals may mean your playign will cost you money:(

PRO_32 Proficient

PRO_32

Posted
Posted

well still not idleing. So i decided to do a compression test down to 80psi on all cylinders.

Have no idea why only thing i can think of is that lifters may be getting pushed down more than the standard cams .2mm more with gtr cams so it might be letting the oil get commpressed out the whole on the side.

any help would be good. Did SK mention to any of you guys if he carried out any other modifications to make it work.

TurboX Mentor

TurboX

Posted
Posted
well still not idleing. So i decided to do a compression test down to 80psi on all cylinders.snip.

My GTS4 RB20DET was 120 on all last time when OK so yours is down a lot _BUT EVEN!

Does this mean that the timing is out a lot not allowing full compression - did you align the timing marks etc. correctly??

I have a set of GTR cams awaiting installation in our Dragcar RB20 when this is sorted out.

I do have a spare stripped head so I will lay the GTR cams in it and dial them soon.

PRO_32 Proficient

PRO_32

Posted
Posted

OK so all we've been able to come up with is that maybe the lifters need to be bled as they might be leaving the valves open.

So I took the cams out again and bled lifters put ex cam back gotto do inlet cam tommorrow then see if it's back to normal.

I hope so

My GTS4 RB20DET was 120 on all last time when OK so yours is down a lot _BUT EVEN!

Does this mean that the timing is out a lot not allowing full compression - did you align the timing marks etc. correctly??

I have a set of GTR cams awaiting installation in our Dragcar RB20 when this is sorted out.

I do have a spare stripped head so I will lay the GTR cams in it and dial them soon.

mabru Enthusiast

mabru

Posted
Posted

Tomei's website has all the OEM cam info, http://www.tomei-p.co.jp/_2003web-catalogu...r_engindex.html click on camshaft, then specs on the top of the page.

The lobe center angle on RB26 cams are a bit diferent than the LCA on the 20 /25 cams, I'm pretty sure that timing the motor using the standard marks won't work. I think that might explain the low compression and bad idling issues. I tried this swap on my old 20 with standard cam gears and could barely hold an idle and power was nil. At one point we accidentally retarded the exhaust cam 1 tooth and it actually ran a bit better. I'll be trying it on my 25det with adjustable gears shortly and will post results.

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