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Re: How much can I mill my '906 heads
[Re: Kern Dog]
#950441
03/14/11 03:27 AM
03/14/11 03:27 AM
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Joined: Jul 2008
Posts: 30,431 Florida STAYcation
BeEtLeJuIcE !
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,431
Florida STAYcation
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Quote:
It annoys me when people try to steer me away from my intended path, so instead I will just ask: Why is half a point of compression that important?
So THEN Fd ....why are you trying to STEER HIM away from his "path" ? ...
And that 2-3% ... is a bunchOhooey !!
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Re: How much can I mill my '906 heads
[Re: Kern Dog]
#950443
03/14/11 03:54 AM
03/14/11 03:54 AM
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Joined: Jul 2008
Posts: 30,431 Florida STAYcation
BeEtLeJuIcE !
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,431
Florida STAYcation
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Come on FRANKENdude ... lighten up !! ... I have seen your sense-of-humor and style of writing before ... Mildly twisted ... I must say ... Now the % ? ... again ...LOOK at what you are saying. LOTS of guys have taken smog motors and boosted the compression up 3 points ...and seen A BUNCH of performance increase. Way WAY more than 6 or 9% as you suggest. Do I have factual numbers and dyno sheets in-front of me now ? ... No.
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Re: How much can I mill my '906 heads
[Re: 70Drop]
#950446
03/14/11 01:59 PM
03/14/11 01:59 PM
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Joined: Jan 2003
Posts: 75,020 U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,020
U.S.S.A.
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Quote:
The bore is 4.365 (.040 over on a 440). And yes, the bore is bigger than the chamber in the head. The 0.075-inch measurement is from the head gasket surface to the quench pad portion of the combustion chamber in the cylinder head. That is measured by putting a straightedge over the gasket surface of the head and sliding feeler gauges underneath.
I figure I can squeeze a little more compression out of this motor, since I'll be running a fairly big cam with a late intake valve closing event. I don't have that spec in front of me right now, but I've run 10:1 on an engine with a cam that had an earlier intake closing and had no detonation problems.
You need to round that edge over or you have the potential for a hot spot that will cause preignition. General rule of thumb is .005 for evry 1cc on a 906 so you need .0025 off to get your half point compression.
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