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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

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Old 11-14-2010, 06:11 PM
parr4 parr4 is offline
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Piston Cooling Jets?

New Ford engines have this system. Any description of what the system is/does?
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Old 11-14-2010, 06:14 PM
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Older ones had it too. I believe the 6.0 and may be the 7.3has it but i could b wrong.I know for a fact the 6.4 has it. It is a little spout that comes up at the bottom of the cylinder and spits oil under the piston to keep it cool.... Its really only needed on diesel engines due to the high temperatures in the cylinder.
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Old 11-14-2010, 06:37 PM
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ok thanks. timed to individual piston travel?
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Old 11-14-2010, 06:42 PM
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Quote:
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ok thanks. timed to individual piston travel?
No. It's just pointed at the underside of the piston crown, and shoots oil on it to keep it cool(er).
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Old 11-14-2010, 08:54 PM
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The old idi 6.9 and 7.3 diesels had it also. The pistons can get very hot in a diesel engine, especially if they are overfueled. We try to tell people who love to turn their engines up and blow black smoke that they are getting ready to melt the pistons in the engine, but some don't listen and end up ruining it anyway.

Some of the big time diesel truck engines have a composite piston with a steel top and a aluminum bottom.
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Old 12-11-2010, 07:14 PM
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300 I6's had this system as well.
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Old 12-11-2010, 07:27 PM
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300 I6's had this system as well.
There is no purpose for this feature in regular street driven gas engine.
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Old 12-11-2010, 07:31 PM
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the 300's had a problem with pistons disintegrating, probably because their low torque curve caused high cylinder temperatures due to high combustion pressure. regardless of whether or not it was necessary, ford added oil jets to the rods on the 300, however I believe it was necessary
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Old 06-17-2011, 07:14 AM
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I can't see how that works, and doesn't kill oil pressure...I'd figure oil squirming in a open space all ill pressure would go away, since it takes path of less resistance...
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Old 06-17-2011, 09:01 AM
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How would it kill oil pressure? This has been done for many years on production engines as well as race engines and is a proven method for reducing piston temperatures. It's not just a hole where oil flows out of. The pressure is maintained by the sizing of the jets, or the groove sizes in the connecting rods.

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Old 06-17-2011, 09:27 AM
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I can't see how that works, and doesn't kill oil pressure...I'd figure oil squirming in a open space all ill pressure would go away, since it takes path of less resistance...
uses a small opening to ensure a steady jet of oil. the small opening is a restriction in-and-of-itself. it doesn't take much of a stream to keep the piston cool...
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Old 06-17-2011, 10:27 AM
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I'd have to see one in person to figure It out..lol iv never torn a motor apart that has one..iv never heard of them until my friends miata, but I never saw a jet on the rods of the 1995 1.8 miata motor we tore apart..
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Old 06-17-2011, 12:07 PM
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Miatas have squirters that screw onto the block with a hollow Banjo Bolt.

Click the image to open in full size.

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Old 06-17-2011, 01:38 PM
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Same concept as a garden soaker:

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Old 06-17-2011, 02:49 PM
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Same concept as a garden soaker:

That's a good way to explain it...
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Old 06-17-2011, 02:49 PM
 
 
 
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