Piston+rods for gen 2 coyote / block strength

[Jackson1320]

Street/moderate turbo = .005"

When you are in the 700+hp area that is not moderate. Gap to what you want doesn’t bother me. Gap just a little bit to small and boom gap a little bit to big nothing. .004 is not going to cause any extra blowby. I would not gap less than.006 with boost. Don’t believe me call a machine shop.

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[Bmaughan]

A straight edge is all you need and feeler gauges. There’s about a 99% chance you don’t need nothing but a head gasket

What size straight edge do I need? I don’t have the heads off so I can’t really tell.
Can I get away with a 24” one?

 

[Grimreaper]

You need a machinist straight edge. Had older machinist tell me homedepot ones were just as good years back. He grabbed the HD one he had on the wall and put it against the actual machinist edge. Waves for days. Conversation ended there and I came back for my block.
Some might know the difference some might not.

 

[Bmaughan]

You need a machinist straight edge. Had older machinist tell me homedepot ones were just as good years back. He grabbed the HD one he had on the wall and put it against the actual machinist edge. Waves for days. Conversation ended there and I came back for my block.
Some might know the difference some might not.

Of course.. that part I assumed.. just not sure on the length needed to check across its length or diagonally for that matter

 

[engineermike]

Fwiw the 2018 cobra jet ring gap is .018-.020 for both. I believe it runs over 20 psi and 1000+ hp.

 

[Jackson1320]

What size straight edge do I need? I don’t have the heads off so I can’t really tell.
Can I get away with a 24” one?

A 24” is more than enough

 

[Bmaughan]

A 24” is more than enough

perfect thanks

 

[Bmaughan]

Fwiw the 2018 cobra jet ring gap is .018-.020 for both. I believe it runs over 20 psi and 1000+ hp.

Good to know!

 

[Jackson1320]

Fwiw the 2018 cobra jet ring gap is .018-.020 for both. I believe it runs over 20 psi and 1000+ hp.

Doesn’t it run 1mm rings. The material and size makes a difference.

Anyone building a engine needs to do the homework because at the end of the day who is paying if something is wrong

 

[kngklla]

Stumbled upon this old thread. Can't help the OP much, but FWIW the 2016 Cobra Jet has a 1.2mm top ring gapped to 0.022"

 

[Jackson1320]

I just recently blew a head gasket... so while I have the whole thing apart I was thinking about swapping pistons and rods since I’ve heard the pistons are most likely the weakest link.

so the question is what do you all recommend?
My car is Procharged making an estimated 700-750 at the wheels on E85 at about 13lbs.

At that power level, what would be the best value?
Are there any “no balance needed” setups?...
or is that lingo just empty marketing and a balance is always necessary?

Any idea if this power level is pushing it for the stock block? Or is it no sweat?
Man I just don’t want to tear this thing down again haha

thanks for your help!

for this power level install cylinder supports and leave stock or just leave stock

 

[tdstuart]

for this power level install cylinder supports and leave stock or just leave stock

Replying to an old thread you already replied to haha.

 

[Jackson1320]

Replying to an old thread you already replied to haha.

yup

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