Ball & Spring.

 

nvm joe beat me to it.

 

Correction, they are called oil jets, not oil squirters, lol.

I would NOT remove them. Everytime I open the motors that have been prepped for N/A or turbo applications, always the bottom of the piston looks pretty and shinny. I guess the oil JETS are doing their job.

What the hell, remove them and report to us about 1 year from now.

Edit: the engine block I got is from a Mazda Protege LX, it also uses ball and spring, FYI, no need to use a lot of torque to tighten them. If I remember its about 10 psi.

 

What oil pressure do they open at?

 

There are two blind holes drilled near the wrist pin area on each side they dont go through to the underside of the piston though. drain back must occur in this area somhow.

I suspect most all the aftermarket pistions I have seen will have some degree of oil control issues because of their design in combination with the oil squirters.

FWIW on my FM 2.0L the wrist pin hole cuts half way throught the oil control ring groove.

Bob

 

To add to the story

So my autocross/track season is over and I am finally getting around to re assembling the 2.0L

An interesting discovery. I planned on removing the oil squirters anyway but checking the new pistons it looks like they would be incompatible with the oil squirters anyway. The stock oil squirter hits the new location of the reinforcing rib on the underside of the piston squarely.

These are new FM Wiseco’s

Bob

 

spin the piston 180 degrees?

 

Maraha has special squirters for strokers. Their kit has more stroke than FM, and the piston comes in contact with the stock squirter.

 

Won't help the bottoms of the pistons are pretty much symetric. Maybe if you had specal rods that twisted about 5 degrees.

Bob

 

It looks like Maraha modifies the location of the alignment pin to get them to clear a similar sort of piston.

More stroke. Interesting the skirt on the FM stroker piston skirts already sticks out the bottom of the cylinder at the bottom of the stroke. Maraha must stick out even more.

Bob

 

Please tell me you were joking.

 

I find it hard to believe that a company would sell a piston that could not be used with the oil squirters. From this angle the piston does not look symmetrical.

 

1. FM specifically states on their website that those Wisecos were meant to be run without the oil squirters.
2. It's a ******* shadow in the pic.

D. You can't install pistons 180* around. Not if they have valve pockets, anyway.

 

when he wrote that i checked my supertech 8.8:1 pistons i have on my shelf.

they arent symetrical... so if the poster had them in wrong that is a valid point.

there is a relief in the skirt for the squirter on my pistons.



One of the engine builders i talked to recently mentioned boring out the oil passages... would this be for the bearings or the squirters?

 

1.If he already knew this then why post? If the manufacturer says "Don't use this ****", then obviously you wouldn't use it.

D. No ****. The pistons also normally have cutouts for the oil squirters on one side.

 

For everyone that has removed the oil squirters what have you plugged the holes with?

M10 x 1.25 bolts with copper washers?
Cut and flattened the factory squirters nozzles?
M10 x 1.25 set screws with threadlocker/theadsealer?

 

Fun fact.

When Ford built the new Boss 302, they modified the 412 hp "coyote" engine to make 444 hp with different camshafts and intake manifold. They also gave it forged pistons and removed the oil squirters.
Not saying you should remove them. But its not that retarded of an idea. If you have a forged bottom end and want reliable oiling at high rpm, I would consider ditching them.

EDIT:
4 year old thread. Why.

 

I had fun reading my old posts

 

Fun reading my old post.

FWIW my engine still going strong without the oil squirters and has lasted now 3X longer than any of my 350+hp builds that all failed with oil consumption, bearing, and piston wall wear issues.

Bob

 

my squirters are removed. We rebuilt the engine after last season and the bearings where absolutely like brand new inside and that egine was revved to 8k for 10hrs and was zinged several times. no oil pressure issues or piston issues