Cylinder lubrication?

[oil_film_movies]

Originally Posted by DGXR
Do most modern engines pump oil through the crank & con rods to the wrist pins in order to lubricate the cylinder walls? Has this become the standard method for piston/cylinder lubrication? Maybe it would be easier to list those designs still using splash or squirters? Thanks.

Cummins ISX engines use an oil passage up the connecting rods:

 

[TiredTrucker]

The GM DI 2.4L LEA like the one in my 2017 Equinox uses piston squirters.

http://gmauthority.com/blog/gm/gm-engines/lea/

 

[4WD]

Are we past 1% yet ?

 

[CT8]

Originally Posted by oil_film_movies
Originally Posted by DGXR
Do most modern engines pump oil through the crank & con rods to the wrist pins in order to lubricate the cylinder walls? Has this become the standard method for piston/cylinder lubrication? Maybe it would be easier to list those designs still using splash or squirters? Thanks.

Cummins ISX engines use an oil passage up the connecting rods:

Lubes the wrist pin.

 

[double vanos]

Squirters for underside of the piston also help the oil warm up faster - seems like I read that somewhere...

 

[bbhero]

Originally Posted by 4WD
Are we past 1% yet ?

 

[Propflux01]

My Twin Cam Harley has them, does that count?

 

[OVERKILL]

Originally Posted by double vanos
Squirters for underside of the piston also help the oil warm up faster - seems like I read that somewhere...


Yes, the role of squirters is to cool the underside of the pistons. In doing so, they more rapidly increase the sump temperature.

 

[Revving2Redline]

Honda had them long ago on the Type R cars. Now they are even on my car. http://www.motorreviewer.com/engine.php?engine_id=83

 

[Skippy722]

Originally Posted by Linctex
Originally Posted by CT8
Squirters squirt oil to under the pistons for added cooling.


These are pretty darn rare... piston squirters don't exist on 99% of the car and light truck engines out there.

Diesels, Yes.
Gas engines, not hardly ever.


FCA's Pentastar V6 has piston squirters, but they're only active above 3500rpm.

 

[Linctex]

Originally Posted by Convert

So to state that squirters are not commonly in use is a slight misstatement . Not in my application.


I didn't realize they were becoming more common.
Many modern engines are becoming so difficult to rebuild that I haven't been inside many (and they last a lot longer, too)

Originally Posted by 4WD
Are we past 1% yet ?


Perhaps!

 

[Shannow]

Piston squirters, by definition are there to reduce piston crown temperatures...

Cylinders (and gudgeon pins) are lubricated by big end side leakage spray (and yes, the stuff squirters spray around, however that's not the intent of the squirters.

And per the OP's request, not many con-rods are drilled to lubricate the gudgeon.

 

[oil_film_movies]

A lot of squirters, which makes me wonder if sodium-filled valves won't be mainstream as power density rises on modern machines.

Those Cummins ISX (and other diesels, old models too) that have the rifle drilled oil path in the connecting rods, cause flow to reach the wrist pin & then cylinder wall too.

 

[StevieC]

Originally Posted by Skippy722
Originally Posted by Linctex
Originally Posted by CT8
Squirters squirt oil to under the pistons for added cooling.


These are pretty darn rare... piston squirters don't exist on 99% of the car and light truck engines out there.

Diesels, Yes.
Gas engines, not hardly ever.


FCA's Pentastar V6 has piston squirters, but they're only active above 3500rpm.

I think they are active all the time. I don't see anything in the lubrication schematic on the PentaStar engine that would indicate otherwise.

 

[Skippy722]

Originally Posted by StevieC

I think they are active all the time. I don't see anything in the lubrication schematic on the PentaStar engine that would indicate otherwise.


I read it on Car and Driver, so it could be wrong... I know the pump doesn't kick into high pressure mode till about 3500 though

 

[Shannow]

Some, and I have no idea which have poppet valves that don't flow until a certain pressure is achieved