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rb26 cams in rb20 with standard ECU works!

WazR32GTSt

By WazR32GTSt,
in Engines & Forced Induction

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jnr32r Proficient

jnr32r

Posted
Posted

i wouldnt be so sure about that mate, why do you think torque settings are spceified....

i actually was measuring with a micrometer today to see if the cams were bent at all (these are the ones i bought from BBenny) and it turns out that there is a very very small deviation on both cams of 0.09mm on the exahust cam and 0.06mm on the inlet cam. And i could just press slightly with my finger right in the middle and actually change it by 0.10mm. So you can imagine how much it would affect it if you tightend just one of the bolts too much.

The other interesting thing i found was that the lift in the inlet cam was actually 8.9mm not 8.5mm as seen on other threads. The exhaust cam was actually 8.5mm as previously described.

browny Proficient

browny

Posted
Posted

Not sure if I agree with that. If everything is set up correcly I would think the only affect of overtightening the bolts would be some local distortion of the cap and head. Wouldnt it have to be massively overtightened for this to occur?

ylwgtr2 Grand Master

ylwgtr2

Posted
Posted
i wouldnt be so sure about that mate, why do you think torque settings are spceified....

i actually was measuring with a micrometer today to see if the cams were bent at all (these are the ones i bought from BBenny) and it turns out that there is a very very small deviation on both cams of 0.09mm on the exahust cam and 0.06mm on the inlet cam. And i could just press slightly with my finger right in the middle and actually change it by 0.10mm. So you can imagine how much it would affect it if you tightend just one of the bolts too much.

The other interesting thing i found was that the lift in the inlet cam was actually 8.9mm not 8.5mm as seen on other threads. The exhaust cam was actually 8.5mm as previously described.

sorry i disgree.....It would make no diffrence....if you want to see if the cams are bent....you should be using a dial indicator

Angry Proficient

Angry

Posted
Posted

yea u have the r32 gtr cams ..they have more lift on the inlet side ..as per the tomei standard camshaft spec list ..http://www.tomei-p.co.jp/_2003web-catalogu...haft-specs.html

edit: sorry my bad .. i'm sure that list said otherwise.. unless its been changed recently

jaik Mentor

jaik

Posted
Posted
Roy, when you did ur cam swap did you use a torque wrench and set it according to RB26 or RB20 specs?

Ill be trying the swap next w.end so we'll see how it goes...

Again, I will be following this thread with great interest as you swap out your cams as I am desperately wanting to know if its a go or a no go as I need to do my timing belt and thought I may aswell do it at the same time.

JK

Chris32 Veteran

Chris32

Posted
Posted

I think there are a few things that you need to be sure of to attempt this, judging by everyones experience - correct me if I am wrong :(

1) - straight cams

2) - correct tensioing of the cam caps

3) - nice new'ish timing belt that won't slip, prefferably a new belt

From everyone's experience, if all that is right, then correct installation should be no problem

Mine are on hold, injectors and PFC are next, then exhaust manifold and cams, maybe headwork......... where to stop :P

V8eta Apprentice

V8eta

Posted
Posted

For all those interested i have some R33 GTR cams arriving tommorrow and when i get a chance ill be putting those into my gts4. Not running std ecu through (have a link) but will let everyone know how i get on and if theres any probs (fingers crossed it works well )

Chris32 Veteran

Chris32

Posted
Posted

I think the general thinking is they are all pretty much the same with minimal differances?

Sydneykid would be the best bet to answer this, as from memory he has seen cars with 32,33 and 34 GTR cams installed

WazR32GTSt Grand Master

WazR32GTSt

Posted
  • Author
Posted

Jaik:

"I" didn't install them, i had them installed by my mechanic. this is not something to play around with at home if you ask me...

and the car runs fine no hassles...

power increase was good top end but at that stage i had the stock cat-back exhaust on still.

Now that i have a 3" cat-back there is so much more midrange torque the cams have really shown their worth now. To use this as a benchmark, 0 - 160 i was 5 carlengths ahead of a manual tx5 turbo which had full exhaust, pod and headwork. and mine is an auto :cheers:

have fixed up a pinging problem i had (timing too far advanced) and keen to get it on the dyno at the next dyno day.

Waz.

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