piston cooling for N/A motor running a turbo - IDI Engine - VWDiesel.net The IDI, TDI, and mTDI source.

piston cooling for N/A motor running a turbo by billybobf on 07 Apr, 2012 00:23
Ok, so Ive got plenty of machine shop backround and I am wondering what others have done? I have worked in performance machine shops building stroker motors (GAS ONLY)

custom mods of internal engines not so much Ive sleeved with dry liners before to save odd blocks or single damaged cylinders. (I actually currently have a storm vulcan boring bar just for doing dry sleeves if you think buying hard parts like that from prothe would be ok?)

I could A: try to reach the factory oil galley and put in factory style squirters or B: adapt the factory oil holes on the rod or C: maybe the most tricky and upgraded version of b, I was thinking about making an elongated slot in the rod bearings just like they do for the crank bearings, BRAZE a soft copper line to the connecting rods, with similar care to clearance of a stroked motor, I could route that soft copper line up the rod around the small end and push oil to bottom center of the piston, could possibly do this without elongating the holes on the bearings though. I would probably have to tig braze to reduce heat into the connecting rods and probably mostly tacking at certain locations.
I know that for press fit piston pins you can heat the little end to BLUE without damaging the rod. I also have a lot of experience tig brazing materials. would losing the cylinder oiling squirt matter if that same amount or more oil was running down the piston skirts from inside the piston?

is there a difference in N/A and TD rods? do you think "C" would work, be a good idea, be a bad idea, do you think I should elongate the duration its getting oil? as long as its on the up side of the stroke not the combustion/down side?

Let me know what you guys think! if custom rods werent so spendy Id say aluminum rods rifle drilled from big end to small end and a slot in the small end bushing to oil the bushing and push cool oil to the piston would be cool, but would also be right on the highest wearing area of the bearings.
#1 by R.O.R-2.0 on 07 Apr, 2012 10:06
you can run boost just fine without oil squirters..
#2 by theman53 on 07 Apr, 2012 10:26
Many have drilled into the oil galley and added the stock squirters. They are not a nessesity though as ROR said.
#3 by R.O.R-2.0 on 07 Apr, 2012 10:44
unless you are going for MAXIMUM power... jets are not necessary.
#4 by 745 turbogreasel on 07 Apr, 2012 12:15
Engines with squirters last longer, VW or no, Diesel, or no.
I like the OE system doesn't come on until the RPMs are up a bit.
#5 by R.O.R-2.0 on 07 Apr, 2012 12:44
Quote from: 745 turbogreasel on 07 Apr, 2012 12:15
Engines with squirters last longer, VW or no, Diesel, or no.
I like the OE system doesn't come on until the RPMs are up a bit.

yup.. the VW jets have check valves in them that only spray when oil pressure is high enough.

its a good and a bad thing.. if you have a motor with REALLY GOOD OIL PRESSURE, like my engine, then the jets will never quit spraying. i have 40psi at hot idle..

or, if you have an engine with REALLY LOW OIL PRESSURE, then they may not spray until the oil pressure comes up, and who knows how many RPMs the engine will have to build before its enough..

most scenarios, its nice.. but unless you are building a HOT ROD diesel engine, i wouldnt even worry about paying to have it done..

its not as simple as drilling a hole and threading it.. you must mill the block flat in the correct spots, then drill into the oil galley, then drill 4 smaller holes NOT into the oil galley, and use those for the retaining screws.

unless you are running into issues, and you NEED this done, i would just forget about it. it helps for sure, but its not NECESSARY.
#6 by Blocksmith on 07 Apr, 2012 13:21
Yeah, I would think that if protecting the pistons is your primary concern, then ceramic coating the pistons would be more desirable than going to all the trouble of installing oil squirters. It would have the added benefit of keeping the heat up in the cylinder combustion chamber where it belongs (rather than just transferring it to the oil), increasing efficiency.
#7 by R.O.R-2.0 on 07 Apr, 2012 13:27
Quote from: Blocksmith on 07 Apr, 2012 13:21
Yeah, I would think that if protecting the pistons is your primary concern, then ceramic coating the pistons would be more desirable than going to all the trouble of installing oil squirters. It would have the added benefit of keeping the heat up in the cylinder combustion chamber where it belongs (rather than just transferring it to the oil), increasing efficiency.

i would have to agree with you on that.. the ceramic coating would be better than the cooler jets..

the only thing the cooler jets have over the ceramic coating, is that the jets lubricate the upper cylinder, but diesels dont have an issue with upper cylinder lubrication..