So i have a 87 928 motor can someone tell me if this is the early one with oil holes in pistons?

 

I was meaning to ask if the hole in this shot of a piston was the oil hole everyone talks about?

 

The oil hole is an oil squirter. The holes in the piston are return holes. The squirters will have a slight ledge into the cylinder wall.

 

Not sure i understand could you explain a litter better,not to quick(me that is)thanks for your help

 

If you mean big hole on the block partly hidden by crank counterweight, no. It's not oil squirter everyone talks about. Squirter hole cannot be seen from below. It's small round hole pointing towards piston bottom.

 

You will have to use a small mirror and flash light to be able to see if there is a hole on that flat surface at the bottom of the cylinder bore. The hole is part of the block not the piston.

Here are some examples. The LS engine one is interesting since they show the tool they use to drill the hole.

http://ls1tech.com/forums/forced-ind...uirters-2.html

https://rennlist.com/forums/968-foru...squirters.html

 

Thank you so much i finally get it.I will look tomorrow and repost.

 

Is your oil filler neck plastic or aluminum?

 

Heck i do not remember what was on it, does that tell you? It may have been plastic or missing when i got the motor. People thought that the motor was frozen when i got it out of the car and looked it over i found a small flash light wedged between the fly wheel and the housing . I had a very good laugh over that one.

 

What is the serial number of this engine, m28/41 81H ... or M28/42 81H ....?

 

m 28/42 81h06625

 

Come back

 

I'm not sure that it really matters, in a stock application.

Sure, you are going to have less oil pressure at the bearings because of the oil that is lost squirting oil at the pistons. And these engines already have an oil supply problem to some of the rods. And the oil temperatures are going to be higher in the oil pan. And there's more oil flying around inside the engine that the crankshaft has to slog its' way through. And these engines already have a serious "windage" problem.

However, I wouldn't "fret" that I had the squirters, in my stock engine.

I know that some '87 owners are all "giddy" that they have a "squirter block" and think they have something really trick. However, try to keep in mind that Porsche only did this for a few months.

And they didn't stop doing it because it worked so well.

And they sure didn't stop because they ran out of parts.

 

Here's a dumb question but one I have always wondered about. Why does the 32 valve motor call for so much oil in the crankcase?

 

Same quantity as a 16 valve.

However, there would be a whole bunch more of these engines still alive today, if the 32 valve engines did hold more oil.