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RB26 camshafts in RB20??

bbenny

By bbenny,
in Engines & Forced Induction

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bbenny Mentor

bbenny

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yeah i tried all that Ben and Joel,

I just took it around the block then and it drives ok, feels a bit sluggish down low but starts to go hard by about 4000rpm, but i dont want to take it to high RPM or drive it too much just incase... but i drives, but will not hold idle.

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DRFT32 Enthusiast

DRFT32

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HEY bbenny

just a thought but in the process of taking it all apart you may have accidently disconnected 1 or a few vacuum hoses...i know when i was mucking around puting in a catch can i knocked a vacuum hose and it did the same thing...idle would drop then die....similar to when you have a stock RB20DET and disconnect the plumb back pipe from the BOV

just a thought..maybe check all ther hoses

Aaron

Chris32 Veteran

Chris32

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yeah i tried all that Ben and Joel,  

I just took it around the block then and it drives ok, feels a bit sluggish down low but starts to go hard by about 4000rpm, but i dont want to take it to high RPM or drive it too much just incase... but i drives, but will not hold idle.

Wierd?? sounds like a vacum leak, or something like that. Is your vacum lines hooked up to your BOV? Might pay to get a timing light and check the timing??

Does it blow alot of black smoke out of the exhaust at idle? That is a sure sign of a vacum leak.........

bbenny Mentor

bbenny

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i played with the idle, but no adjustments made any difference.

i did pull the throttle body off for the installation but i dont think that would be the cause.

It runs fine when you give it some throttle.

the only thing i see responsible is the stiff in. cam...

i have tried just about everything else there is!

Chris32 Veteran

Chris32

Posted
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i played with the idle, but no adjustments made any difference.

i did pull the throttle body off for the installation but i dont think that would be the cause.

It runs fine when you give it some throttle.

the only thing i see responsible is the stiff in. cam...

i have tried just about everything else there is!

does seem odd, thats why I thought of the throttle, maybe its not open enough under idle or something? could explain why its running fine when the throttle is open a little? just a thought, as other wise I have no idea mate, sorry

You checked base timing yet? what is that set to?

I can't really see how a cam that is harder to turn (but is also is just as hard when the stock cam is in place) would be the culprit

bbenny Mentor

bbenny

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well it was noticably harder to turn...

but then again that could be due to some of the lobes compressing a valve or two...

I can only point to a few possibilities - either the in. cam is not turning free enough, as we have discussed.

or the posibility that the timing belt jumped a tooth when i started the engine

however i did turn the engine manualy 3 revolutions and check the timing marks on crank and cam pulleys...

Its frustrating!

I will disasemble the whole damn thing again and see if i find anything.

bbenny Mentor

bbenny

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Yep i think it is.

Ive decided to bail on the cams as i just cant afford aftermarket management.

otherwise it would be one kick-ass upgrade, i mean 25rwkw average increase for $300 is pretty damn impressive!

so im a little dissapointed i cant pull it off with the std ecu

bbenny Mentor

bbenny

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i can confirm it is the ECU flysky. because i checked and tried everything, there were no other causes.

and SydneyKid has done several running a PFC with no problems and considerable gains.

no probs with standard cams joel

Roy Grand Master

Roy

Posted
Posted

Cams and cam gears are in... only thing is i need someone i Melb that has a blown RB20 that i can steal some parts off.

I need the cap for cylinder no.6 on the inlet cam...as one of the stud has siezed in the aluminium cap, i was lucky to get it unbolted from the head without snapping or seizing...

Anyone in Melb able to help me out, or know of a friend/workshop that can help me without woth one (will need thw two stude that go with it as well.

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