Rb26 Rebuild Help

[Craig19789]

Hi,

Well I've confirmed my worst today. My 33 GTR, which I've owned for 2 months, has low compression. I threw a gauge on it tonight and its down to 125psi on all 6 cyls. I dropped a bit of oil in the cyls and the compression came up to 170psi.

Unfortunately for me, I am meant to be super sprinting on the 1st May.

Does anyone know any workshops in Sydney that can pull an engine out for me this week? I know its short notice, I've called around a few places and everyones booked out till after easter.

If anyone can help out or know of anyone im more than happy to pay $$$$.

I guess it seems I trusted the wrong guy and bought the car untested on his word. I was told it has forged internals and it does have bigger cams. I just hope the bore isn't scored or anything else bad.

Does anyone know a good rebuild kit? Whats a good suggestion for bearings and head gasket?

Thanks heaps for any help you can give.

Craig

0424854025

[gtr_scottie]

hey mate give paul from red r racing a call, he probley wont pull the motor out but his work is the best i have seen his number is 0419259522. But he can be alittle hard to get ahold of sometimes

[zebra]

If its 125 accross all 6 it might be fine, was the motor hot or cold, dont forget forged pistons sit loose in the bores when cold.

[MBS206]

As ZEB said, it could be all fine.

Normally when a motor drops comp, not all of the cylinders drop the same amount. If they're all equal it sounds like a nice clean spec from when it was built.

Is it blowing blue smoke once warm?

What made you test it?

[DVS JEZ]

Don't rebuild it just because its down too 125psi.

Keep enjoying it

[The Bogan]

Bring it up to operating temp and test it, mine rattles like its got lose nuts for a while on start up but when its warm it quiets right down.

Bit like me really.

[Craig19789]

Hey guys, I pulled it down and was I lucky I did. it was 125psi across all 6 when the engine was hot. A couple of drops of oil down the plug holes and they came up to 172psi. It was also suffering from severe blow bye. When you reved it the oil pressure would rise above the full pressure 8 kg/cm or what ever the reading is.

When I pulled the engine down I found a few surprises.

1. The thrust bearing was torn to shreds. The crank was suffering anodizing due to it.

2. The conrods had a really dodgy polishing job. They were standard rb26 rods, but one had started to crack due to where the buffing pad had cut into the rod.

3. Several of the conrod bearings showed severe flat spotting in the 6 o'clock position indicating detonation or pinging.

4. The rings were worn bad and the hissing noise past the pistons were crazy.

So now I've done the following:

1. Ground the crank and bought new acl race bearings all way around.

2. New Nitto h beam rods

3. New Nitto oil pump

4. Ground out the exhaust manifold where there was massive restrictions.

5. Metalcraft 9 liter sump

6. Mines cam baffles

7. UAS oil air seperator

8. 3 liter cusco catch can

9. 1.2mm and block off restrictors

10. Nitto drag series 1.2mm head gasket and full engine gasket kit

All I need to finish the rebuild is

1. Just jap silicon hide kit.

2. Tomei rings to suit my tomei cooling ring pistons.

[The Bogan]

Ouch

[zebra]

That was quick!

Also why I would never trust a "rebuilt engine" In a 2nd hand car or 2nd hand engine