Phil99vette

iTrader: (11)

I am debating about what combo to use for my next 2 engine builds. I can either heavily mill the heads / use flat tops or mill the heads .030 / use a dome piston. Any input from you serious engine guys?
Phil

TAQuickness

iTrader: (28)

Given your criteria, I'd go with domes.

Given any option, I'd look at heads with a smaller combustion chamber and use flat tops.

Phil99vette

iTrader: (11)

I need to set this new motor up with 12-12.5:1. I can go with a 8 - 10cc dome and a .030 mill with a thin gasket. If I did it all in the head it would be a .060+ mill?
Phil

goober35

iTrader: (1)

dont mill the heads. get you some +7 or +15 cc pistons. I am against milling heads.

Phil99vette

iTrader: (11)

Goober,
Why do you say not to mill the heads?
Phil

iosigma

Once you mill them, you obivously takin away material on the heads you can't put back. I would experiment with different gaskets, pistons etc. Just safer

goober35

iTrader: (1)

IF you mill the heads you will compromise your PV clearance. If you take it out of the pistons and the if you need the exster point of CR then u can take it out of the heads. If you already took a .030 -.040 of the heads and you need more but your PV is to close you have screwed your self.

Phil99vette

iTrader: (11)

If I get dome pistons they are going to have reliefs for the valves. I guess I am more worried about flame speed and if a dome piston will hurt performance due to a slower flame speed.
Phil

jfs0209

Any time you add a peak to a combustion chamber you are going to add a hotspot. The Ideal condition would be a totally flat piston with a small combustion chamber; in real life conditions that is hard to do. I would compromise with the smallest cc chamber I could get then calculate what piston cc I would need to get the desired compression ratio.

Phil99vette

iTrader: (11)

T T T

Stu'sWS6

iTrader: (3)

True-but how are the low/midlift numbers going to be affected by milling the heads?

I'd talk with someone that has some experience with milling the AFR 205's.

What bore are you thinking?

MUSTANGEATER

iTrader: (10)

My first choice would be to weld the chambers up, then Angle Milling. Domes would be my last choice.

Floyd.

SStrokerAce

iTrader: (2)

Good Call Floyd

MUSTANGEATER

iTrader: (10)

Thanks Bret.

Now go get me a beer before I make you a porch monkey.