Mark another one dead

[DAVECS1]

What does that mean?

Closed deck on top open deck on bottom

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[JeepOfTheseus]

Along with that the minimum pulse width for the injectors no longer goes below stock. When the load reaches close to 125% above 5000 rpm injector 5 or 6 just intermittently quit spraying fuel. Yeah that will make you mess you pants.

Which position are 5 and 6? Are you referring to firing order or physical location? I finally tore down my engine a bit and saw clear oil/damage in the passenger side intake valve closest to the firewall. There was a chunk of cast aluminum on top of the valve.

 

[DAVECS1]

If I could overwrite the chrysler OS, I would feel alot better about things.

 

[DAVECS1]

5 and 6 are the two back cylinders

 

[DAVECS1]

Did it come out of the head or piston Ryan

 

[NC_Overland]

Closed deck on top open deck on bottom

And as a whole that’s worse for forced induction?
Thank you btw. I know a pretty decent amount about engines, but less about forced induction other than forged internals are good and avoid detonation. Hah.

edit: And I wished I had forced induction when I lived in CO. Hah

 

[JeepOfTheseus]

Did it come out of the head or piston Ryan

Need to tear down further. The visible damage was two holes on either side of the bottom end, along with a huge chunk blown out the driver side - maybe halfway down? This is the first I’ve seen from the top.

 

[JeepOfTheseus]

Main issue with tear down is fuel rail. I can’t drain the line this time like I did for the install.

 

[ShadowsPapa]

And as a whole that’s worse for forced induction?
Thank you btw. I know a pretty decent amount about engines, but less about forced induction other than forged internals are good and avoid detonation. Hah.

edit: And I wished I had forced induction when I lived in CO. Hah

There's a lot of people running SCs on open deck engines, some even from the factory.

Open deck allows more coolant around the combustion chamber and a lighter block design.

Here's another closed deck engine ->

 

[CerOf]

And as a whole that’s worse for forced induction?
Thank you btw. I know a pretty decent amount about engines, but less about forced induction other than forged internals are good and avoid detonation. Hah.

edit: And I wished I had forced induction when I lived in CO. Hah

Open deck gets better cooling but has less bore support. In higher hp motors with higher pressures, the bore can deflect a bit. This does bad things to pistons and other parts. ie BOOM!

Closed deck gives the most support to the bores.

More goes in to it and I only know enough to make myself look silly.

 

[ShadowsPapa]

Open deck gets better cooling but has less bore support. In higher hp motors with higher pressures, the bore can deflect a bit. This does bad things to pistons and other parts. ie BOOM!

Closed deck gives the most support to the bores.

More goes in to it and I only know enough to make myself look silly.

Actually, most of the time it's not boom, it's most common for the cylinder liners to crack at or near the very top. The cylinder can flex at the top due to the extreme pressures - and no bracing...

This is the most common damage -

Check out what Subaru performance people as well as others are doing....... some will handle some pretty good boost.
But then there's also semi-open (or semi-closed, same thing) deck, and you can brace an open deck engine block.

Semi-closed ->

You can also sleeve an open deck block ->

This is one way to brace an open deck block -

 

[shokker70]

I’ll take your 55% humidity any day, come on down to the Houston area, it will make you appreciate only 55%. ?

1st, apologies for hijacking a thread!

2nd, to you good sir, there's a reason I do not live in Houston!!

 

[ShadowsPapa]

Open deck gets better cooling but has less bore support. In higher hp motors with higher pressures, the bore can deflect a bit. This does bad things to pistons and other parts. ie BOOM!

Closed deck gives the most support to the bores.

More goes in to it and I only know enough to make myself look silly.

BTW - that didn't look silly at all.

10 points to Gryffindor for having a decent understanding of the tech.
And may your cylinders not crack or deflect. (and may your rockers not click and tick)

 

[NachoRuby]

Actually, most of the time it's not boom, it's most common for the cylinder liners to crack at or near the very top. The cylinder can flex at the top due to the extreme pressures - and no bracing...

This is the most common damage -

Check out what Subaru performance people as well as others are doing....... some will handle some pretty good boost.

That looks exactly like what happened to my Subaru. New short block under warranty though.

 

[ShadowsPapa]

That looks exactly like what happened to my Subaru. New short block under warranty though.

Yeah, that pic might even be one I found a couple of years back when researching my stupid idea or a SC on my truck...........
I talked myself out of it. But it was close, especially with Dave doing the hard part. I almost started an account to save up for it.
If one is going to fail, that's the most common failure right there. When you build crazy pressures in a chamber, that chamber would love to expand and when it does - CRACK, right up top because that's where the weakest link is. (that would make a good name for a TV game show....)
Cylinders flex. Heck, even bolting a head on flexes a cast iron block - that's why there are special plates to bolt to the top of the block when honing to size - to sort of replicate the block distortion caused by bolting a head on.

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