Gen 2 coyote rebuild

[JVO21303]

So I always had trust issue with mechanics, and not being able to do things, right. I’ve been working on vehicles with my dad since I was about eight. So I bought the car off my brother-in-law and about two months later check engine light came on low compression cylinder five. About the build
1. ARP everything
2. Cometic head gaskets
3. Manly rods.
4. Mahle Pistons.
5. boundary racing oil pump gear.
6. boundary racing crankshaft timing sprocket
7. Hi Tech, cam chains.

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[Basspro302]

Ok

 

[furdfan2018]

Dig in. I built a gen 3 and it's not as hard as one might think.

Get a digital copy of the factory service manual -- learn the stupid way it's organized to find the sections you need. All downhill from there if you can read and follow colorful directions lol.

Good luck.

 

[Skydiver]

Nice! I am currently building a 5.2 Predator block Coyote. The last one I built over 4 years ago was a forged rods and pistons Gen1.

 

[Excelerater]

Hyper piston dont like heat.....
Forged rotator will help ,I would ask can you stroke these to a larger CID ?

 

[HKusp]

It's not the pistons so much, it's the ring gap. I would gap the top 2 rings more than the factory spec of .009 even if going to stay NA. Just for piece of mind.

 

[JVO21303]

Dig in. I built a gen 3 and it's not as hard as one might think.

Get a digital copy of the factory service manual -- learn the stupid way it's organized to find the sections you need. All downhill from there if you can read and follow colorful directions lol.

Good luck.

It was completed the end of December

 

[KingKona]

Nice.

Nice to know it's done right, and will last.

 

[JVO21303]

It's not the pistons so much, it's the ring gap. I would gap the top 2 rings more than the factory spec of .009 even if going to stay NA. Just for piece of mind.

I followed mahles specs on the gap

 

[HKusp]

I followed mahles specs on the gap

Which was?

 

[JVO21303]

Which was?

Bore x 0.0060"

 

[HKusp]

That's piston to wall clearance. Was was their commended ring gap?

 

[JVO21303]

That's piston to wall clearance. Was was their commended ring gap?

 

[HKusp]

I stand corrected. In my opinion, (taken for what it's worth-which is very little) is waaay too tight. The factory ring gap is .009 and that's why there are so many ring land failures. On my build, I went .025 top gap and .026 (if memory serves) which will net about a 1-2% loss of compression, but will never get in a situation where THIS happens again:

 

[JVO21303]

I stand corrected. In my opinion, (taken for what it's worth-which is very little) is waaay too tight. The factory ring gap is .009 and that's why there are so many ring land failures. On my build, I went .025 top gap and .026 (if memory serves) which will net about a 1-2% loss of compression, but will never get in a situation where THIS happens again:

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