Deck clearance?

[Alaskaracer]

I think I'd listen to Steve. He builds some of the most powerful and fastest supercharged/turbocharged engines in the country.....He knows what he's talking about.....

[Super_Stock]

I listened .... No clearance or lots of clearance.. I guess anything in between is OK as well... LOL..
I've used tight squish to get rid of death rattles, not induce them.
Maybe it's a different story on the old diesel air pump and hair drier stuff..

[englertracing]

I agree with this...:

https://www.youtube.com/watch?v=lr86J9g0PWA

What? Drawing on your cylinder head?
So you either have virtually no gap between the head and piston top or you enlarge the gap so the flame front can get in there to stop pinging?
I don't know, but I think that's a real laugh...
Maybe if he showed a head that had the chamber "laid back" as he says, instead of the felt tip diagram, then it may make a little more sense, but he's sort of describing an open chamber style head to me..
Might as well run a small dish in the piston.

It's something that's done on turbo and nitrous stuff well into quadruple digit horsepower levels.

[Super_Stock]

Yeah, it's old news, doing all that chamber magic went way with a better piston design..

[stealth]

I guess... Keep laughing...

this guy seems to agree too....(he even marks up heads too)

https://youtu.be/YOSF32VgTt4

[Chris_Hamilton]

Didn't Steve Morris mention in that video something about cutting a trough in the head. To someone who is relatively ignorant like me that sounds like the Singh grooves that many here seemed skeptical about.

And wasn't the OP talking about a NA setup? Are boosted/turbo chambers all that relevant?

[Super_Stock]

Didn't Steve Morris mention in that video something about cutting a trough in the head. To someone who is relatively ignorant like me that sounds like the Singh grooves that many here seemed skeptical about.

And wasn't the OP talking about a NA setup? Are boosted/turbo chambers all that relevant?

Yes, it's not relevant.

Stealth, the only reason I'm having a chuckle is because he's simply describing creating an open chamber..

Ah yes, the "Singh grooves".. Maybe a "spiral" ground into the squish pad will be the next big thing?
You heard it first here fellas. I'll call it the "Cosmic Spiral". Feel free to test it..
And yes, it's not relevant either.

[Alaskaracer]

Yeah, it's old news, doing all that chamber magic went way with a better piston design..

Not when it comes to big nitrous engines. They soften the chambers on pretty much every build. How much of a cut and angle of cut is determined by chamber shape and amount of nitrous they will spray. My cylinder head guy does ALL of Pat Musi's stuff....if you think they aren't playing with the chambers and just using a "better piston design", you're somewhere out in left field, WAY past the fence......

[Super_Stock]

Yeah, it's old news, doing all that chamber magic went way with a better piston design..

Not when it comes to big nitrous engines. They soften the chambers on pretty much every build. How much of a cut and angle of cut is determined by chamber shape and amount of nitrous they will spray. My cylinder head guy does ALL of Pat Musi's stuff....if you think they aren't playing with the chambers and just using a "better piston design", you're somewhere out in left field, WAY past the fence......

I'm sure people play with chambers all the time, in conjunction with piston design..

[houser45]

.035” to .040”

[408 Nova]

Well everybody, I'm going with .040", as close as I can get anyways.

Thanks everyone for your recommendations and tech advice.

[Super_Stock]

Cheers..

[GettyUp]

Any comments about the clearance amounts and RPM use discussed in this video? https://youtu.be/rBZCnG1HwDM?t=2381

[MadBill]

It is widely accepted that (at least for NA apps) zero dynamic squish/quench is ideal, but unless one is prepared to creep up on it maybe five thous at a time, better to leave ~0.040" for steel rods and 0.060" for aluminum. Obviously, other factors apply such as RPM, component design and weight, piston rock at operating temperature, aluminum block expansion, etc.