Piston Cooling

[Roy]

Anyone out there know if the setup as used on SR20 which has the squirters that spray the underside of the pistons can be engineered onto any engine, say an RB30 bottom end.

Just curious to know how the system works, if someone can explain or point me in the direction of a good website.

[Merli]

I believe Tomei have designed a piston for the RB26 that has oil cooling channels on the underside of the piston.

You really won't need this unless you're running extreme horsepower.

[Warpspeed]

The RB26DETT has oil squirters under the pistons. I believe that all the RB blocks are pretty much the same as to where all the oil galleries are located in the block casting.

I have heard of squirters being fitted to RB30s, but have never actually seen one that has been done. It would require machining a flat area inside the block casting, and drilling and tapping holes into the main oil galleries. Each squirter is held by a banjo bolt, and a dowel pin to stop it rotating on the banjo bolt.

The pistons also require part of the skirt removed so that it will not destroy the squirter at the bottom of the piston stroke. Have a look at a GTR piston to get the general idea.

The banjo bolts are special in that they have an internal spring loaded ball. Oil pressure opens the ball to make the squirter squirt. But when the engine stops, the ball and spring prevents all the oil in the engine oil passages from draining back into the sump.

[Roy]

I dont think my 200rwhp is extreme, even if it is thru one wheel with my not so LSD diff

Curious to know the ins and outs of the system though. Thanks Warpspeed.