ARPM case w/Piston Oil Squirters

bartman360 · Posted: Sat Sep 10, 2011 1:24 am Post subject: ARPM case w/Piston Oil Squirters

Just purchased a used ARPM case and it appears to have taped and threaded orifices that direct a stream of oil to the back of the pistons. My question is has anyone seen this mod done before? Most parts in this engine are super high quality and it seems rational that the previous owner would not cared about the extra expense to perform this proceedure. Will post pics tomorrow.
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ALB · Posted: Sat Sep 10, 2011 5:47 am Post subject:

While not everybody does it, piston squirters are not uncommon in the VW world. It's my understanding that it's used in some newer high output motors and is something that can benefit our little beasts. Porsche has units that can be adapted to VW cases and only open above 20 psi. I think it would be advantageous in a bigger bore motor.
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gears · Posted: Sat Sep 10, 2011 8:30 am Post subject:

Not that uncommon of a mod. The standard 911 squirters are a better choice than the Turbo version.

Image may have been reduced in size. Click image to view fullscreen.

mark tucker · Posted: Sat Sep 10, 2011 8:42 am Post subject:

Ive thought about doing it,but dont know if it will do a lot with the creamic coated piston tops,but it will help cool the pin. how big of an orfice are you guys using?

raygreenwood · Posted: Sat Sep 10, 2011 8:46 am Post subject:

The thing to remember with this mod...which is actually on a HUGE range of engines you will find in the junkyard (Some Hondas, Volvos, Mercedes, Toyotas etc.)...is that on our engines you only have oil pressure on one case half of the main bearings ....so you have to use main bearings with the groove on the backside. You then drill an oil access hole in the other case half to access that main bearing groove and carry oil to the other side of the case. Ray

gears · Posted: Sat Sep 10, 2011 8:56 am Post subject:

? The orifice is in the Porsche piston squirter. In the photo above, main bearings with the backside channel were utilized. For the other type of bearing, merely drill small holes in the bearing's channel, lining up with the installation/feed holes for each squirter.

[email protected] · Posted: Sat Sep 10, 2011 10:21 am Post subject:

oiling the 1/2 side of the case is addressed in Bob Hoover's HVX mods. It's relatively simple to address.
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ALB · Posted: Sat Sep 10, 2011 10:29 am Post subject:

gears · Posted: Sat Sep 10, 2011 12:01 pm Post subject:

Apparently, some folks have found the larger-orificed Turbo squirters to be too much of a good thing. Perhaps those guys will chime in.

RockCrusher · Posted: Sat Sep 10, 2011 12:24 pm Post subject:

mark tucker · Posted: Sat Sep 10, 2011 1:23 pm Post subject:

RockCrusher · Posted: Sat Sep 10, 2011 1:41 pm Post subject:

Bill271 · Posted: Sat Sep 10, 2011 4:31 pm Post subject:

If you are running a turbo or nos it will keep your pistons alot cooler if its n/a dont run em

raygreenwood · Posted: Sat Sep 10, 2011 4:51 pm Post subject:

I'm putting in a set of external oil squiters I have been working on for a while. Damn near to drilling the holes for them.

The squirters are four hollow 8mm bolts I had drilled out with a 2mm hole through 90% of each bolt. I will be putting flanged thread inserts in the top of the case...just back from the sheet metal by about 5mm...just offset from the piston rod path by about 3/8". After I index and mark the bolts in each flanged insert so I know they face the right direction.....I will grind a flat spot on each thread section down near the tip.
I have some testing still to do to figure out hole size.

I havn't decided whether to weld a tube onto each bolt tip and use a banjo bolt to connect to the oil ring...or do something else. With this method....I can clean them or remove them if necessary..or make the orifices larger or smaller without splitting the case. They will not steal oil from the mains either.

If its normally aspirated...and you live in the land of constant 100F heat in the summers...for sure run them. But it will put extra heat into the oil so think about the oil cooler. Plenty of n/a cars on the road with oil squirters AND watercooling that benefit from these. Ray

craigman · Posted: Sat Sep 10, 2011 5:13 pm Post subject:

Would be nice if there was a "how to" on doing such a mod. Cool

raygreenwood · Posted: Sat Sep 10, 2011 5:49 pm Post subject:

Not far off . I have been thinking on it hard for about three years. Originally I was petrified worried that drilling four 10mm holes in the case roof would detsroy the case.
Then I had to work out the bolts to reach the right position...the flanged inserts so the bolts would seal in the case.
I found a nifty "Y" to split oil to both sides evenly here http://www.uvprocess.com/product.asp?code=PUMP+ACC+R

I'm working on exactly where to feed oil from....but not a big deal. It will have a 15-20 psi check valve. Ray

gears · Posted: Sat Sep 10, 2011 7:38 pm Post subject:

The two photos practically provide a "How To" for installing Porsche's squirters. A small end mill starts the hole from the saddle side; a 13/64" bit is drilled all the way through, followed by a taper-ground 1/4" drill bit stopping short about .020"; each piston squirter is tapped in gently with a punch for a snug, leak-free fit. Porsche designed the spring-loaded check ball into these to assure no oil pressure loss at idle. Guys have been doing this mod for almost 30 years.

edit: size of squirters confirmed to be 6.1mm. A taper-ground 1/4" drill bit (1/4">5.98mm) works perfectly. The squirter drops snuggly down the hole, with the taper shape on the deep end assuring an interference fit the last 3 mm. Gently use a punch and small hammer to seat. (The check ball end of the squirter is robust .. made to be seated this way.)

mark tucker · Posted: Sat Sep 10, 2011 10:52 pm Post subject:

I like the spring /ball feature, thats nice.where do you get these?and how much are they? turbo is doubtfull,alltho I know some reckord holders I could get good info from but there v8 stuff ,outlaw,mostly runs promod now.Blower might happen,spray is a possiabilty.but it,s just a play toy on the street everyday.

gears · Posted: Sat Sep 10, 2011 11:23 pm Post subject:

911-101-011-01-OEM $26.75 each Pelican parts They've gone up from the $6 we used to pay Ray Litz .. but I suppose they're worth it.

bartman360 · Posted: Mon Sep 12, 2011 1:25 am Post subject: Squirters


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