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Shaving the head??? 

 

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 Post subject: Shaving the head???
Posted: Sat Feb 28, 2009 8:53 pm 
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hi guys I was thinking of shaving the head 30thou will there be any problem with the valves hitting the pistons???? if so can any one tell me wat is the most I can go??
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 Post subject: Re: Shaving the head???
Posted: Sat Feb 28, 2009 9:01 pm 
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Not sure how much can be taken off, but you will weaken the head....it is only alloy. If you want compression, build an engine thats meant for more compression.......its safer. :|

 

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 Post subject: Re: Shaving the head???
Posted: Sun Mar 01, 2009 12:14 am 
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i got mine shaven not sure how much though
pingd on normal petrol but with premium its fine
goes a bit better to a good cheap mod

 

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 Post subject: Re: Shaving the head???
Posted: Sun Mar 01, 2009 11:10 am 
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30 though would be alot. There is an indicator on the back of the head to show how much has been taken off, that indicator shows the limmit that ford reccomends. But like EA_FALCON said pinging and dettination is an issue and so is ecconomy and valve clearance. The safest way to up you compression is to change pistons!

 

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 Post subject: Re: Shaving the head???
Posted: Sun Mar 01, 2009 2:16 pm 
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ive got 40thou off my head, 8 thou off my block, au headgasket and higher comp pistons and have no issues
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 Post subject: Re: Shaving the head???
Posted: Sun Mar 01, 2009 2:37 pm 
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ok so I was thinking that if I have a look at the head and see the marking and talk to the guy thats going to shave the head then he will tell me whats best???? but I could take off 60thou in a XFlow with out any problems.
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 Post subject: Re: Shaving the head???
Posted: Sun Mar 01, 2009 3:16 pm 
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elvondel wrote:
ive got 40thou off my head, 8 thou off my block, au headgasket and higher comp pistons and have no issues


wtf.... how much compresion is that? over 12.0:1 or something?
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 Post subject: Re: Shaving the head???
Posted: Sun Mar 01, 2009 3:43 pm 
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FordFairmont

I was thinking that too LOL

elvondel

How much comp do you have now??? and how much better does it go???

 

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 Post subject: Re: Shaving the head???
Posted: Sun Mar 01, 2009 10:24 pm 
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Lol i was also thinking that as soon as i saw 40 thou off the head and 8 thou of the block not to mention a thinner gasket and hi comp pistons. I would love to know what comp ratio you have in that engine. Are you running it on LPG?

 

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 Post subject: Re: Shaving the head???
Posted: Sun Mar 01, 2009 10:45 pm 
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I shaved 50" from the head, 15" from the block, ACL race pistons to get a comp ratio of 11.3:1. And yes Im running LPG. Head is being reworked again, to get more comp, might even give the block another 5" so the pistons will be flush at TDC instead of 5" down the bore.

 

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 Post subject: Re: Shaving the head???
Posted: Sun Mar 01, 2009 11:11 pm 
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thats a massive call going flush at TDC i would like there to be a lil leeway, you just carnt be dead set on ppl machining skills/machines.
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 Post subject: Re: Shaving the head???
Posted: Mon Mar 02, 2009 6:46 am 
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given Im a mechanic and work for a engine reconditioning place, all will be well. Every thing will be double checked and then checked again :)

 

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 Post subject: Re: Shaving the head???
Posted: Mon Mar 02, 2009 10:39 pm 
Getting Side Ways
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Ohk fair enough, I would only trust my self with stuff like that on my car.
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 Post subject: Re: Shaving the head???
Posted: Thu Mar 19, 2009 8:49 pm 
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im about to put an eb xr6 reco head on my eb,
wanted to know if any knew a good guy in the south east suburbs of melb who could shave them?

 

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 Post subject: Re: Shaving the head???
Posted: Fri Mar 20, 2009 9:20 am 
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elvondel wrote:
ive got 40thou off my head, 8 thou off my block, au headgasket and higher comp pistons and have no issues


Did you need to flycut the pistons for this setup? I'm doing something similar but sticking with std pistons and my engine builder is planning on flycuts for extra insurance. Just interested to see what others have done in this situation.

 

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