Milling Heads Versus Air Flow
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TECH Junkie
Joined: Dec 2005
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Milling Heads Versus Air Flow Say you have a pair of heads that have 68cc combustion chambers. The intake flows 270cfm. Now you have the heads milled to 62cc to raise the compression ratio. Will this effect the air flow of the intake and say the exhaust? If so in which way? Thanks.
You can hurt airflow if it cuts into the valve seat OR it dramatically changes the chamber shape relative to the what the head porter wants. Concave chambers have the biggest losses with this.
Bret
Bret
In that reguard it can unless the chamber is there to help direct the air more.... if the bore is tight then it might be better to smoothly transition the air/fuel into the bore better than to let it run into that verticle wall.
Bret
Bret
FormerVendor
Joined: Nov 2001
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From: Houston, Tx.
It may or it may not. More often than not dramatic milling of heads can often result in lower airflow if the port is not brought back inline with the new chamber. You can take a small amount off of most heads without much impact though.
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TECH Apprentice
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Originally Posted by SStrokerAce
If you start to get close to the intake seat, it's dramatic.
I don't have data to show, but I feel that anything inside .100" of your top 30* cut would have a measurable effect. That falls within the workable radius around the seat.
TECH Apprentice
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Thank you white2001s10 that was a great explanation and just a sidenote to Brett I wasn't trying to complain about the initial explanation you gave just was wondering if you had any rule of thumb that was a little more... concrete than "close".
