Piston cooling

Dutch VeeRod · Post by **Dutch VeeRod** » Wed Jun 29, 2005 3:06 pm

I was searchiing on the internet last week and found a site where they talked about a Type 1 casing with oil jets to cool the pistons.
Does anyone know anything about these cases or mods.

Thanks, BART

farmer · Post by **farmer** » Wed Jun 29, 2005 4:09 pm

For what I know, that is always custom made. It is especially good for turbo engines. There are several hi tech german builders that can perform the job if you wish.
T.

Murdock · Post by **Murdock** » Wed Jun 29, 2005 4:18 pm

You can buy OEM Porsche piston oil squirters from a dealership or online very easily. The installation is easy buy I would recommend you send your case to a Porsche garage that has installed them before (as many have). There are two types from Porsche that I know of, the NA engine version and turbo- (the turbo delivers more oil/better cooling). They operate easily, just a ball and valve in a sleeve- and will only open at a certain pressure so you won't be squirting oil at idle. Make sure to have a good filteration system on your engine otherwise you can clog the squirter rendering it useless.

Pablo · Post by **Pablo** » Wed Jun 29, 2005 6:04 pm

I'll see if Tom can post a photo for me, showing the installation of the Porsche piston squirters in a Type I case. It's a pretty neat way to keep the pistons about 100 degrees (F) cooler. Or go here:

69bajakid · Post by **69bajakid** » Wed Jun 29, 2005 7:40 pm

My neighbor had turned me onto the idea of using oil squirters for the pistions..as i have a turbo charged bug...

never seen a pic of it in a type1 case before now..thanks allot...

you figure a porsche shop could pull this job off on a type 1 case?
it looks like it should be a easy job that one could do at home with the right tools.
i will have a search for part #s..if i find them i will post them on this thread....anyone know what motors had these squirters?

thanks
Cale

Murdock · Post by **Murdock** » Wed Jun 29, 2005 8:17 pm

Just go to pelican parts and you can order them there, they are not cheap but it is oem Porsche (just so happen to have a bag of them in front of me). I wouldn't hassle with it at home because if you screw up, you could starve your main bearings of oil very easily and you won't know until it's too late. Just have a Porsche shop do it, many have replaced the NA variety with the larger turbo squirters or replaced them because they were severely clogged.

A_67vdub · Post by **A_67vdub** » Thu Jun 30, 2005 10:35 am

This was discussed recently somewhere. CLF, maybe? I don't remember. Anyway, I think it was mentioned that RIMCO has done it before. To do it correctly involves a 1/4" tapered reamer.

Pablo · Post by **Pablo** » Thu Jun 30, 2005 11:43 am

Yes, discussed on Samba a couple weeks ago. That photo is over 20 years old, before Rimco began doing it.

A 1/4" ENDMILL is used to start the hole, FROM THE BEARING SIDE. It's important to use an endmill, otherwise the bit will wander at that angle. Drill about 1". Then use a 3/16" bit to go all the way through. Follow with a tapered 1/4" drill (custom tapered for .001"-002" intereference fit), STOPPING JUST SHORT of punching through. Tap the squirter into place.

The 1/4" hole overlaps the oil channel on the backside of the bearing by about 50% --- plenty enough for oil supply. If you're using main bearings with the oil channel on the crank journal side, a small 1-2mm hole angled from the channel to the squirter hole is all that is required, without even touching the bearing surface.

Some shops will go from the piston side toward the bearing saddle, and then peen the installed squirter in place. This is NOT the correct way to do it.

Dutch VeeRod · Post by **Dutch VeeRod** » Thu Jun 30, 2005 1:54 pm

Thanks, I´m gonna check if there is someone in my area that can do this job. I want to use it for the engine I´m going to build. Its a 2332 with turbo, nitro and/or waterinjection. I wanna go all the way.............

Thanks for the info, BART

Murdock · Post by **Murdock** » Thu Jun 30, 2005 2:03 pm

Nitro as in nitromethane (CH3NO2) or nitrous (N2O)?

Loïc · Post by **Loïc** » Thu Jun 30, 2005 11:00 pm

I saw somewhere the same modification on a FAT performance 1835cc engine.

Dutch VeeRod · Post by **Dutch VeeRod** » Fri Jul 01, 2005 12:03 am

I want to use a Nitro Oxide System (NOS).

Thanks, BART

Post by **Piledriver** » Fri Jul 01, 2005 6:24 pm

I just hit Pelicanparts and came up dry.

Hit the BBS, and found this jewel, part#s, install instructions and all--
Looka like 5mm is the right size, a tapered 1/4" bit sounds silly seeing how these go in:

http://forums.pelicanparts.com/showthre ... genumber=2

5mm bits are probably a bit easier to source vs a "custom tapered 1/4" reamer", and a 5mm is what Porsche uses.

"Splash Valve" is apparently what these are called...

Murdock · Post by **Murdock** » Fri Jul 01, 2005 8:51 pm

http://www.pelicanparts.com/catalog/sho ... htm#item23

There they are
Oil spray valve

Post by **Piledriver** » Fri Jul 01, 2005 8:59 pm

Thanks, I'll see what the bigger ones cost first.

Pelicans search must have issues...