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RB26 cams in a Big single RB20.. experinces

teejay

By teejay,
in Engines & Forced Induction

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teejay Proficient

teejay

Posted
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has anyone tried this and what level of succes did you get with this setup?

pretty much my question is... is it worth going 26 cams for a rb20 with a big single, or should i look at more serious cams like hks jun et all ?

the turbo will be one of these "china" type turbos

.50 front .63 rear t3 flanged ... equivilant to the smallest gt30r around.

i suspect significant lag will be experienced, but would like to see if the rb26 cams in someones experience is worth doing. if they could reduce lag by around 500rpm compared to stock the price i can get the cams for would be worth it.

cheers

tj

teejay Proficient

teejay

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1 - cams are definitely 100% gtr - i know where they came from

2- this turbo isnt china china - its from brazil, seemed to power gotboost to a 11.0 quite well, still fine, runnig alot more boost then i intend too

price is for my eyes only :) sorry dude

3 - cubes, replacement 20's are plentiful and cheap, ill take the risk

anyone with experinces though

GTRgeoff Grand Master

GTRgeoff

Posted
Posted

I fitted GTR cams in the RB25DET and found, as advised by Ben at Racepace Melbourne (RPMGTR), that they have too much ramp angle causing loss of compression at low RPM, say under 5000, but over they felt pretty good, really good. These were the ones that destroyed Roy's top end, yet they worked to expectation in mine after a polish of the journals. I will be getting a regrind of the flanks to allow for use with the hydraulic lifters and will be posting results elsewhere.

Roy Grand Master

Roy

Posted
Posted
.... These were the ones that destroyed Roy's top end, yet they worked to expectation in mine after a polish of the journals....

Tis was truly a sad day:(

Does anyone know the correct clearance between cams and the journals/caps? Since Geoff had the cams checked and they were true, it would seem that the damage was maybe done by the journal/cap i used off another RB20, as the clyinder where i used it was where the metals gal'd ?!?!?!?!

Is it possible that the clearance was just a little too tight? From memory my inlet cam showed a few wear marks as well. So just how critical are the tolerances when say your engine has 170,000kms on it, and the cams you are installing were from a low kms (something like 35,000km) GTR and the replacement bearing cap was off an unknown RB20...too many variables floating around in there?????

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