[JSH]

Originally Posted by Megahurtz

Which cylinder(s) had the strap partially missing? If not all of them I would point to inconsistent meth distribution. Maybe its time to go port and run Ethanol

All of the logs I saw had good Lambda but I do recall some times it would be lean for a moment which was likely the meth delay. I do recall we also ran on low boost with a no meth tune. I'm just trying to think when could this have happened. Pretty sure you checked the plugs recently so this had to have happened recently as well?

either way....lets put it in Atlas port and E85. Sunoco can deliver a 55 gallon drum of E85R

PS we have run the LTR7IX on cars up to a little over 900 wheel but they get changed often and these cars run Meth plus E75. Race gas plus meth won't keep things as cool so yeah I agree with the guys above that its time to put in some colder plugs.

We've been chasing coolant issues for at least six months. However, blowing oil into and out of the CC is a new development.

I'm now thinking a colder plug, better heads, .7xx cam, Jet Hot, and a baby shot of Meth (Gain 3) and race gas.

[KingLT1]

Originally Posted by Joshinator99

Not comparable, NGK and Brisk use different heat ranges. Lower number with Brisk is colder and NGK is the opposite. My recommendation above is correct.

Yup, Here is the chart.

https://www.camaro6.com/forums/showp...9&postcount=31

[JSH]

Originally Posted by KingLT1

I would run a 8 heat range plug for your power imo. Brisk RR12 or something equivalent

OK, the 6510 is HR 7, so the next step would be an NGK 8 or Brisk 12.

[Joshinator99]

Originally Posted by JSH

OK, the 6510 is HR 7, so the next step would be an NGK 8 or Brisk 12.

Good rule of thumb is one heat range colder for every 100-150 HP. Believe I read that from one of Howard Tanner’s posts back in the day. Safe to say he knows more about this platform than most of us lol

So,
Stock SS: HR 5
650 HP stock ZL1/supercharged SS: HR 6
750-800 HP: HR 7
900-950 HP: HR 8 (Brisk RR12S)
1050-1100 HP: HR 9
1200-1250 HP: HR 10 (Brisk RR10S)

Since 1250 HP is 1050-1100 WHP, that’s why I went with the RR10S.

[KingLT1]

The type of fuel used plays a factor as well. Best bet is to use the chart as a reference and physically read the plugs after a hard pull.

[JSH]

Originally Posted by KingLT1

The type of fuel used plays a factor as well. Best bet is to use the chart as a reference and physically read the plugs after a hard pull.

We just put 6510s in it, but now I'll use a one-notch colder plug.

[JSH]

We pulled the heads off today and I've definitely punched out a head gasket. We're going to look at everything else to see if anything else needs freshening up.
I have to admit that I'm disappointed that an engine rated at 1400 bhp would give up head gasket so easily. I didn't think we were asking that much of it, but obviously we must have been.

[KingLT1]

A head gasket failure doesn't mean the 1400hp rated engine is at fault. For starters, you were running too hot of a plug imo. A 6510 is a projected tip 7 heat range. At your power level you should have a non-projected tip 8 heat range. At bare minimum a Brisk RR12. With Meth and Ethanol fuels, you won't always get knock when cylinder temp and pressure is getting excessive. You could have also been running too much timing. Hard saying without looking at the plugs after a pull to see where the timing mark is on the strap. Last log I had seen of your old combo, the blower was maxed to make the power you want. Maybe consider putting a 427 in it and run 15-16psi instead of 19-20psi. You can't do at 6000ft what everyone else is doing at sea level. You are dealing with a 20% loss in efficiency due to air density.... everything has to work harder to make power.

[JSH]

The ground strap was burned off about halfway back on a number of plugs this time and my guy put the same NGK 6510 back in it. He's convinced projected tip is the way to go and it's the one that he runs in his LT4 also with meth. I'll buy a set of brisk 12s non-projected tips

Originally Posted by KingLT1

A head gasket failure doesn't mean the 1400hp rated engine is at fault. For starters, you were running too hot of a plug imo. A 6510 is a projected tip 7 heat range. At your power level you should have a non-projected tip 8 heat range. At bare minimum a Brisk RR12. With Meth and Ethanol fuels, you won't always get knock when cylinder temp and pressure is getting excessive. You could have also been running too much timing. Hard saying without looking at the plugs after a pull to see where the timing mark is on the strap. Last log I had seen of your old combo, the blower was maxed to make the power you want. Maybe consider putting a 427 in it and run 15-16psi instead of 19-20psi. You can't do at 6000ft what everyone else is doing at sea level. You are dealing with a 20% loss in efficiency due to air density.... everything has to work harder to make power.

[radz28]

Originally Posted by KingLT1

Yup, Here is the chart.

https://www.camaro6.com/forums/showp...9&postcount=31

Originally Posted by Joshinator99

Good rule of thumb is one heat range colder for every 100-150 HP. Believe I read that from one of Howard Tanner’s posts back in the day. Safe to say he knows more about this platform than most of us lol

So,
Stock SS: HR 5
650 HP stock ZL1/supercharged SS: HR 6
750-800 HP: HR 7
900-950 HP: HR 8 (Brisk RR12S)
1050-1100 HP: HR 9
1200-1250 HP: HR 10 (Brisk RR10S)

Since 1250 HP is 1050-1100 WHP, that’s why I went with the RR10S.

Thanks for all that, gentlemen!!! That's definitely handy to have!!!

Originally Posted by KingLT1

A head gasket failure doesn't mean the 1400hp rated engine is at fault. For starters, you were running too hot of a plug imo. A 6510 is a projected tip 7 heat range. At your power level you should have a non-projected tip 8 heat range. At bare minimum a Brisk RR12. With Meth and Ethanol fuels, you won't always get knock when cylinder temp and pressure is getting excessive. You could have also been running too much timing. Hard saying without looking at the plugs after a pull to see where the timing mark is on the strap. Last log I had seen of your old combo, the blower was maxed to make the power you want. Maybe consider putting a 427 in it and run 15-16psi instead of 19-20psi. You can't do at 6000ft what everyone else is doing at sea level. You are dealing with a 20% loss in efficiency due to air density.... everything has to work harder to make power.

I watched a Steve Morris video from Tuesday night wherein he was tuning on a salt lake engine and talked about raising the compression ratio a little bit to account for the elevation DA loss. Might that be helpful here since he's up in the clouds?

[JSH]

Originally Posted by radz28

Thanks for all that, gentlemen!!! That's definitely handy to have!!!



I watched a Steve Morris video from Tuesday night wherein he was tuning on a salt lake engine and talked about raising the compression ratio a little bit to account for the elevation DA loss. Might that be helpful here since he's up in the clouds?

Yeah, LME built 10.5/1 for me for that reason.

[JSH]

King has me at 12, and you at 10S. I need unanimity here!

Originally Posted by radz28

Thanks for all that, gentlemen!!! That's definitely handy to have!!!
I watched a Steve Morris video from Tuesday night wherein he was tuning on a salt lake engine and talked about raising the compression ratio a little bit to account for the elevation DA loss. Might that be helpful here since he's up in the clouds?

[JSH]

Is the RR10S non-projected tip?

Originally Posted by Joshinator99

Good rule of thumb is one heat range colder for every 100-150 HP. Believe I read that from one of Howard Tanner’s posts back in the day. Safe to say he knows more about this platform than most of us lol

So,
Stock SS: HR 5
650 HP stock ZL1/supercharged SS: HR 6
750-800 HP: HR 7
900-950 HP: HR 8 (Brisk RR12S)
1050-1100 HP: HR 9
1200-1250 HP: HR 10 (Brisk RR10S)

Since 1250 HP is 1050-1100 WHP, that’s why I went with the RR10S.

[radz28]

Originally Posted by JSH

King has me at 12, and you at 10S. I need unanimity here!

King' knows better than me! I was only throwing that out there