oil squirters

[Driver_10]

I had talked about this once before. Since then Ive had a change of heart. As opposed to deleting the oil squirter at the rear two cyl. , Id like to add to extra ones to the remaining four.

With that being said...

1. Does anyone have an oiling system "routing blue-print" to look at?
2. Does the 3500 & 3900 have similar oil-pump mounting boses?
3. Has anyone else ever successfully attempted anything like this?
4. Does anyone have two extra "3500 style" oil squirters for sale?

[Guest]

I'll be doing the same with my 3500.

I had originally bought 3 oil squirters to install in one of my 3400 blocks. I have since aquired a 3500, so I will be just adding the 2 squirters for the remaining 4 cylinders.

I bought the squirters through a friend that works at a GM dealership. They are available. I don't know the part number though, since they are buried away at this point.

[boomofdoom88]

Hate to bring up such an old post, but how did that machining work out for you guys? thinking of doing the same thing at some point.

[Daguse5853Z]

I have a book about turbocharging, I can't think of the name offhand, but in one of the chapters it talks about a "trick." No illustrations were given but the writer said most engine machinists would know it. It was along the lines of notching the top of the connecting rod in a way that would squirt oil on the underside of the piston. This might be useful to you if anyone would be able to add more to it the idea than myself.

[Joseph Upson]

I have a book about turbocharging, I can't think of the name offhand, but in one of the chapters it talks about a "trick." No illustrations were given but the writer said most engine machinists would know it. It was along the lines of notching the top of the connecting rod in a way that would squirt oil on the underside of the piston. This might be useful to you if anyone would be able to add more to it the idea than myself.

The 3900 and 3500 VVT motors already have this notch on the stock rods and I suspect the 3500 does also since it uses the same rankshaft requiring upgraded connecting rods from the 3400. It appears oil would be slung more than squirted with it. Not sure how effective it is in a street motor turning much lower average rpm than a race car.

[SappySE107]

You drill a hole through the big end to squirt oil out.

[geoffinbc]

Yup but aim is important. Drill the hole in the wrong spot or angle and oil just squirts at the piston wall making more work for the oil control ring. The fixed oil jets at the bottom of the bore are best since they only flow over a certain pressure and they keep oil on the bottom of the piston through the whole stroke.

Personally I think the use of the jets is far over rated on any N/A motor unless it is high compression and you think that piston heat may be a problem. On and boosted or nitrous motor yes I think it is a good idea. Another key would be keeping the oil right at the coolant temp. Oil temps can often rise to the high side of 250*F in a high output motor so if you really want to keep piston heat down you need to remember to cool the oil too.

[Driver_10]

Im sorry... I guess I never got around to sharing my findings

*Ahem* The cast iron surrounding the oil galley that runs above the crank journals lack enough material to machine a pad to support additional oil squirters. I attempted to have this done, and after speaking with the machinist about his findings, the venture ended as a failed ambition. *sigh* that is all....

And with that, this post... can now die in piece. XX