Documenting a coyote 5.0 build - Page 2
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Thread: Documenting a coyote 5.0 build

  1. #11
    FST Junkie! SIstomper's Avatar
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    Quote Originally Posted by suss6052 View Post
    Why delete the piston cooling jets/oil squirters? Going with coated pistons and trying to increase oil pressure to the rod bearings then eh?
    Yes without them you get more oil pressure to the rod and main bearings. They dont clear the piston skirt either. The Boss and Ford Performance crate motors do not have squirters. According to MMR they are there to warm the pistons faster on cold starts. Some 11-12 coyote blocks didnt come with them either.

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    All buttoned up and will get cams and timed tonight

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    Quote Originally Posted by SIstomper View Post
    Yes without them you get more oil pressure to the rod and main bearings. They dont clear the piston skirt either. The Boss and Ford Performance crate motors do not have squirters. According to MMR they are there to warm the pistons faster on cold starts. Some 11-12 coyote blocks didnt come with them either.
    I don't think squirting ice cold, or at least ambient when the temperatures are warmer than freezing, motor oil will warm the pistons faster on cold starts.

    Piston cooling jets are intended to cool/quench the under-dome of the piston with oil to cool the aluminum from the heat of combustion. From the first few revolutions of the crank and after each cylinder fires for the first time the engine starts heating up from it's coldest point.

    Now mind you that comes at the expense of diverting pressure from the bearings, but at the same time can help somewhat to prevent detonation by cooling the piston. With coatings and such it may resist heat the same or better even without them functioning, but I understand why they are there in the stock application and the possible advantages/disadvantages to removing them for more lubrication to the bearings when going for more power than stock.
    Last edited by suss6052; 11-08-2016 at 08:44 PM.
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    It's done and was shipped back to the installer.

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    It's done and runs great. head cooling mod has it at 15 degrees cooler. Lower compression and no sign of knock. It didn't have one issue and started first shot after priming. The owner is going to put a couple hundred miles on it then we change the pulley and injectors and tune for power.

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    This one is next. This will be a high HP motor for a member on here. I'll start a thread and do a step by step.

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    We are back to where we started power wise with lower compression and more timing as a result. Now we install the smaller pulley and larger injectors. 900 probably wont happen but we should be able to hit 800.

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    Stomper built, Torrie tuned on 12lbs of boost. Car is scary fast. We still haven't been able to run it to 7200 rpm. We just dont have long enough of a road. It'll hit 800 whp at that rpm. Real dyno soon

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