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My RR25 build up project.

DETurbine

By DETurbine,
in Engines & Forced Induction

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DETurbine Enthusiast

DETurbine

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Well it is about that time that my project is restarted. I have had a break away from it saving and researching some things before I just go head over heels and do something that I would regret. About a year and a half ago I swapped a RB25DET SII into my USDM 240sx and just last summer I ended up leaning it out to far and blew my motor. Did a compression test on it after and it was as followed: cylinders #1-5 were at around 110psi and cylinder #6 was at 25psi!.

This weekend I will be taking apart my motor and will probably see a blown piston in #6 and might even find shot rings and/or broken ringlands in the other five cylinders. I am going to be taking it to the machine shop next month

After the motor is back in I will shortly after be putting on my turbo upgrade and the supports for it. Just need to keep saving like I have been doing and in about 3-4 months it should be all done and driving. I will keep this thread updated as I go on.

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  • 3 weeks later...
DETurbine Enthusiast

DETurbine

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Finally got around to pulling my motor apart. Had about three short nights to take it out of the car, pull the tranny, sand blast a few parts, get the motor up on the stand and then took pretty much everything off the block. Finally last night we got around to pulling the head, and taking the rods and pistons out. Cylinder #6 was giving us troubles getting it out, but we ended up getting it out. Ended up that when I blew my motor, I actually melted piston #6.Not what I had thought had happened, but wasn't that surprised. It wasn't that bad, but surely would have really took a melting if I would have drove it for much longer. All the other pistons looked good, no spun bearings, and rods were in great shape still. The cylinder wall on #6 was a little scuffed up and had a little piece of piston melted on the side, but that is nothing that a .5mm bore couldn't take care of.

Now it is time to finally take it to the machine shop and get it bored out, honed, fitted, milled, decked, etc...then some Wiseco 86.5mm pistons, ACL bearings, ARP head studs, ARP rod bolts, rods, 1.2mm head gasket, and some work to the head. Then will go the big upgraded turbo, tial wastegate, custom intake manifold, FMIC, 740cc injectors, aftermarket fuel rail, 6 puck, and piggyback. It is going to be allot of fun this summer once it is out....can't wait to get it back on the streets and to the track with it's make over!....just some long days ahead of me, but I love working on cars, so it will be fun for the most part.

Bobjones Mentor

Bobjones

Posted
Posted
I am getting my pistons from: http://www.rpmmachine.com/wiseco_pistons_s...rtcomp_m_v.html

They are selling them for $660 for the pistons, wrist pins, and rings.

Gold thanks for that.

I would also recommend that if you change the injectors that you change the regulator. The standard one has its limits, I have changed mine already to a Malpassi rising rate, always had them on quick cars and think they are great!!!

And as for the pistons...damn that is cheap especially with the current exchange rates!!!

Thats like $850AUS...

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