hemi replacement for stellantis

ultradriver10000 said:
The very first thing they do to the GTR is sleeve the block lol.

How many Shelby Mustangs get used daily and are expected to get 300K miles without a miss ?

I hope they do well, but given their track record I won't hold my breath. Comparing two low production fairly high performance/profit cars to trucks is basically laughable. The volume difference alone is staggering. I hope they can control the spray fluid and consistency, but my guess is they won't. You'll see rashes of engines that seem fine, and handfuls that are nothing but issues. Thats my guess as an engineer who specifically works on future engine development lol.
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Lots better response!
 
ultradriver10000 said:
I hope they do well, but given their track record I won't hold my breath. Comparing two low production fairly high performance/profit cars to trucks is basically laughable. The volume difference alone is staggering. I hope they can control the spray fluid and consistency, but my guess is they won't. You'll see rashes of engines that seem fine, and handfuls that are nothing but issues. Thats my guess as an engineer who specifically works on future engine development lol.
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I am really curious as to what level of engine durability stress testing that these blocks meet internally at Chrysler. I know at GM the dyno load cell requirements are far worse than any vehicle would ever see on the road. It seems like that coating would be sensitive to spark knock in a boosted engine a lot more than in a high RPM high performance engine. A truck would see high load at lower RPM's and for much longer pulls (especially when towing) than any normal car would see.

I guess Ford has put it out there with the twin turbo six truck. I haven't really heard bad feedback other than people saying to get the V8 for obvious reasons. But that is a sleeved block too. I remember looking at a "Torture test" teardown engine at the auto show's Ford display the year that came out. The pistons had micro-cracking all along the ringlands - but it looked nice and shiny all laid out in a glass case! Maybe we will see the teardown from Chrysler if we ever have an auto show again!

-Geoff
 
WhiteHawk said:
I am really curious as to what level of engine durability stress testing that these blocks meet internally at Chrysler. I know at GM the dyno load cell requirements are far worse than any vehicle would ever see on the road. It seems like that coating would be sensitive to spark knock in a boosted engine a lot more than in a high RPM high performance engine. A truck would see high load at lower RPM's and for much longer pulls (especially when towing) than any normal car would see.

I guess Ford has put it out there with the twin turbo six truck. I haven't really heard bad feedback other than people saying to get the V8 for obvious reasons. But that is a sleeved block too. I remember looking at a "Torture test" teardown engine at the auto show's Ford display the year that came out. The pistons had micro-cracking all along the ringlands - but it looked nice and shiny all laid out in a glass case! Maybe we will see the teardown from Chrysler if we ever have an auto show again!

-Geoff
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Agreed.

Krazybones said:
ALL 5.0 based Coyote blocks are Spray bored in Windsor. This has been going on for over 4 years now. FYI
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True, but anyone adding boost to make power in a 3rd gen puts liners in the block. Running a NA V8 vs a boosted I6 is a bit different... You will see much higher peak cylinder pressures and a much higher risk to dedication... especially in a truck pulling a trailer. Think of how much load each cylinder sees when say towing a 10K lb trailer, now to make the same power, you'll probably be running 20psi in that same cylinder area in the I6 towing the same trailer.

I know different groups are pushing for this technology, but call me old school... KISS - Keep it simple stupid lol... steel liners are basically negligible on weight. They cost a bit more, but to me its cheap insurance. Plus you can always machine a liner 5-20 over to rebuild.
 
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