Block oil squirters..how they do that??

[riotwarrior]

So it comes to mind a lil something that I wonder about.

Now let me go back to my temder young teenage years first...my 1969 Ford Cortina GT.

I worked in a speed shop and built a wicked engine...this engine had piston jets in the rods...there were small holes in rods a d bearings correspondingly that when the rod passed the oil journal in the crank a spit of oil woukd shoot up in the cylinder....timed by location of oil journal hole in crank.

I dont think it was a constant stream but maybe ....

Now come to our IDI engines with piston cooling oil squirters....how do they function?

2 hypothesis I have...

1 It is a constant flow of oil sprayed up into cylinder and bottom of crown of pistons.....means lots of oil spraying all over in there.

2 Timed spray pattern...how?...well as the engine rotates the valves actuate lifters which have an oil jornal feeding them ..up down they go...cover uncover a port to squirters....but I honestly do not know....

So to all ya older timers with IDI knowledge...which one is it?

I wanna know...and Enquiring minds wanna know eh?

 

[79jasper]

Constant oil spray.
They come off the main oil galleys, iirc.

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[DaveBen]

79jasper is correct. They spray all the time the engine is running. They are for cooling and a quick shot would not do it.

 

[79jasper]

I only know because I recently looked into it. On another forum a dude tried saying the Jets weren't attached to the block. I guess he was saying they were on the con rod. Lol

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[towcat]

early jets are pressed into the block. later jets are boltes in. 6.9(a) vs 6.9(b)and all 7.3 iirc.
it is a constant spray. that is why oil volume is more critical than pressure in our motors. most gassers use a 1/2" pickup tube. IH run 1" suction pipe.

 

[icanfixall]

Al they could not be timed. They are a constant flow of oil. They also are a good reason we can do dry compression tests. With the amount of oil being squirted up under the pistons there is no doubt it sprays down the cylinders too because of the piston and rod action. So no need to feel squirting oil in the cylinders on TOP of the pistons. Actually doing oil on top of a piston becomes fuel and it will detonate just like diesel fuel will. Fast compression creates hot air and oil like fuel will combust under heat and pressure.

 

[riotwarrior]

Figured it was steady stream ....just did not know for sure.

Like these speakeasy chats sometimes....

Thanks everyone whom confirmed my suspicions.

 

[dunk]

When did the 6.9 change from press in to bolt in?

 

[The Warden]

When did the 6.9 change from press in to bolt in?

Not sure exactly when, but based on this, it was pretty late in the run. For comparison, #173828 is the first block with the improved metal around the block heater hole to prevent cracking, and that was midway through 1985...and, the first 6.9L with the bolt-in nozzles is #237016

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I was once told that the press-in nozzles were one-time use, but later I heard of people reusing them...but, you have to be extremely careful with them because they are no longer available, and IIRC a special tool is required to press them in. Honestly, I would think long and hard about swapping to a newer block instead of rebuilding a block if I had an early 6.9L with press-in nozzles that needed to be rebuilt (and, I have a very early 6.9l; it's actually an "A" engine {pre-'84 emissions} with different precups and pistons and a 20.5 compression ratio...fortunately, my engine's happy at the moment)

 

[OLDBULL8]

I've posted this quite a few times. Here ya go Al.

The gear oil pump in these engines is a positive displacement and there pretty good size.

Twelve (12) gallons per minute @ 3300 RPM is a lot of oil being pumped.

 

[Knuckledragger]

When did the 6.9 change from press in to bolt in?

From my experience and the above chart, it was 1987 that began bolt ins. The block casting had to be modified to accept the bolts. I have a 1985 that has press ins. Avoid if possible, they are tough to reinstall after a bore/hone.

 

[riotwarrior]

I've posted this quite a few times. Here ya go Al.

The gear oil pump in these engines is a positive displacement and there pretty good size.

Twelve (12) gallons per minute @ 3300 RPM is a lot of oil being pumped.

Yes and it says piston cooling jets fed from same galley as valve tappets....hench why I inquired re timed or constant flow...

It isnt specific about flow..

 

[OLDBULL8]

It's constant flow from that oil galley. Tappets have nothing to do with the flow to the Jets.

 

[dunk]

Sounds like my 86 is most likely press in. Have been debating pulling engine to freshen up and reseal when I swap my ZF5 in and go to a different turbo. May not be worth opening pandora's box if this could end up being a show stopper if damaging oil jets or unable to reinstall. Can the early blocks be drilled and tapped for bolt in or is the casting different? I have a spare set of bolt in oil jets. Failing that I may just swap the trans and turbo and keep my eyes open for a 93-94 turbo block to rebuild and swap in.

 

[AcIdBuRn02ZTS]

A lot of engines (not sure about the IDI) that use piston oil coolers have a valve/spring built into them in which they only open above a certain oil pressure (helping to maintain idle / low rpm oil pressure). Not sure about the IDI as I said which may just use an open nozzle.