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Au head, how much to shave? 

 

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 Post subject: Au head, how much to shave?
Posted: Fri Jun 17, 2011 1:44 pm 
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As the tittle suggests how much should I get taken of the head? 20,30,40,50 or 60"?

 

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 Post subject: Re: Au head, how much to shave?
Posted: Fri Jun 17, 2011 5:17 pm 
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what are you getting it shaved for?

 

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 Post subject: Re: Au head, how much to shave?
Posted: Fri Jun 17, 2011 5:33 pm 
Getting Side Ways
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Bump the compression up and I figured while it's being recoed, why not.

 

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9/98 AU1 XR6hp-about to retire from the road and be reborn on the race track.
86 ZL mint grandpa spec with premo sound and 150000km
07 TTG 60000km stock as, mods to come.
97 el futura about to be MOCKed

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 Post subject: Re: Au head, how much to shave?
Posted: Fri Jun 17, 2011 6:23 pm 
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go minimum.

The compression is already high enough, take off too much you'll ping and retard the cam timing a fraction.

 

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 Post subject: Re: Au head, how much to shave?
Posted: Fri Jun 17, 2011 6:31 pm 
Getting Side Ways
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Krytox wrote:
go minimum.

The compression is already high enough, take off too much you'll ping and retard the cam timing a fraction.

yeah and if you have a problem with the headgasget in the future you dont wanna be buying a second hand head just to then get it shaved or fully reco'd because the other one is too shaved, you wanna just take yours off shave it minimum and drop it back on

 

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 Post subject: Re: Au head, how much to shave?
Posted: Sat Jun 18, 2011 11:44 am 
Getting Side Ways
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Krytox wrote:
go minimum.

The compression is already high enough, take off too much you'll ping and retard the cam timing a fraction.



High enough for what? Au motors are only 9.6:1, why retard the timing?

 

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9/98 AU1 XR6hp-about to retire from the road and be reborn on the race track.
86 ZL mint grandpa spec with premo sound and 150000km
07 TTG 60000km stock as, mods to come.
97 el futura about to be MOCKed

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 Post subject: Re: Au head, how much to shave?
Posted: Sat Jun 18, 2011 11:49 am 
Getting Side Ways
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i think what he means is the timing will retard if you shave the head too much?

 

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 Post subject: Re: Au head, how much to shave?
Posted: Sat Jun 18, 2011 1:46 pm 
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the timing shouldnt retard if its a non-vct head

 

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 Post subject: Re: Au head, how much to shave?
Posted: Sat Jun 18, 2011 3:02 pm 
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Cam timing will change as the distance between the cam and crank changes but I think it was meant to read ignition timing as the ECU alters it because of knocking.

 

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 Post subject: Re: Au head, how much to shave?
Posted: Sat Jun 18, 2011 3:21 pm 
Parts Gopher
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if you keep good fuel up to it shouldnt that be enough to prvent knocking?? how high could compression really get by just decking the head when you have to allow for distance between the valves and piston with an aftermarket cam?? it would possibly raise to what, 10-10.5 max which the dedicated gas engines run anyway

would ya be able to allow for the retarded timing using adjustable cam gear??

 

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 Post subject: Re: Au head, how much to shave?
Posted: Sat Jun 18, 2011 5:29 pm 
Getting Side Ways
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Ive got a vernier gear for it and it will go on the dyno as soon as it goes on.

 

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9/98 AU1 XR6hp-about to retire from the road and be reborn on the race track.
86 ZL mint grandpa spec with premo sound and 150000km
07 TTG 60000km stock as, mods to come.
97 el futura about to be MOCKed

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