Another engine failure

[luc]

There are a couple of products out there purported to solve the issue with # 8
They both join the left and right heads together with hoses at the back of the heads
One do water and the other one oil...
So they can’t even agree what the issue is ???

Sponsored

 

[luc]

Some people say it’s detonation, some say it’s heat damaging the valve seal and/or guide
So my plan is to add some octane booster for the rack and ask Ford for an extend engine warranty. Should cover me for the next 3/4 years.
Once I’m out of warranty and have to pay for my own engine, assuming I’m still driving the car... fast....I will just build an engine

 

[Robert3487]

I just replaced my engine on my own due to cylinders 5,6 and 8 low compression. But the engine had a rattle so maybe it was more severe than yours. Mine also ran low on oil very quickly.

Edit: 2017 base gt

 

[luc]

So, what do you think... detonation?
Dealer say the ford racing tune is dumping too much fuel and washed out the oil from the cylinders
Also pistons seems pretty dirty for 22k miles

 

[Cory S]

Typical heated ring land failure. It wasn’t too rich, your piston tops would be much more washed that that.

 

[thelostotter]

That seems to be where they break. My #8 ring land cracked on the intake side like yours. You cracked the top surface of the piston, mine broke at the ring land under the top compression ring.

 

[luc]

My new long block being assembled

 

[luc]

Notice the aluminum Valves covers and oil lines at the back of the other engine

 

[ice445]

Brand new Coyotes sure look pretty. My 2 cents is that #8 runs the hottest of any of the cylinders due to how the cooling system works. It doesn't take much in the way non ideal conditions to overheat it and cause ring/ringland failure. It's interesting though, because #8 is where the CHT sensor is closest to. Any idea what your typical CHT's were at cruise and during play sessions?

 

[Schwerin]

Are the Cyl 8 failures due to excessive heat? Does Cyl 8 have any pathways for the PCV system?

Just inquiring because years ago during late 80's mid-90's 5.0/5.8 engines, Ford had issues with the F-Series dropping Cyls 4 and 8;

The 4.6 also had cooling issues on 4/8.

 

[luc]

Brand new Coyotes sure look pretty. My 2 cents is that #8 runs the hottest of any of the cylinders due to how the cooling system works. It doesn't take much in the way non ideal conditions to overheat it and cause ring/ringland failure. It's interesting though, because #8 is where the CHT sensor is closest to. Do you have a performance pack car or the base one? Any idea what your typical CHT's were at cruise and during play sessions?

I have a pp1 car with the power pack 2
It’s a track car
Usually cht was in the 200 to 220 range
My estimated guess is detonation because of 91 octane and will start using booster to be in the 95 range
Also adding those oil balances lines at the back of the heads

 

[ice445]

I have a pp1 car with the power pack 2
It’s a track car
Usually cht was in the 200 to 220 range
My estimated guess is detonation because of 91 octane and will start using booster to be in the 95 range
Also adding those oil balances lines at the back of the heads

I'd agree, especially looking at the upper quench space between the top of the piston and the valves. It got real hot. Seems that 91 just wasn't cutting it.

 

[Cobra Jet]

Came across this regarding Cyls 4 & 8 on the Coyotes (no year specified):

I don't have any other info than what we see in that image clip...

Based on other threads and similar Coyote failures documented, it seems there is a heat problem with cyl 4 and 8, regardless if the vehicle is on Nitro, a tune or forced induction.

 

[racingandfishing]

http://www.modularmotorsportsracing.com/cart/index.php?main_page=product_info&products_id=555

I've seen it but information on it's effectiveness seems inconclusive. Mabye andrew@lethal will chime in with an update since his last post on it.

https://www.mustang6g.com/forums/threads/cooling-mod.149346/page-2#post-3053636

 

[luc]

That’s the oil lines I’m adding to the engine

https://trackmustangsonline.com/thr...oo-coyote-predator-oil-balancing-hoses.17162/

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