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| charlie4401 |
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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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| cjh |
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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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| ea_falcon |
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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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| xr6eat 50 |
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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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| elvondel |
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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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| charlie4401 |
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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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| FordFairmont |
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Posts: 6113 Joined: 8th May 2007 |
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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| MICKYYYY |
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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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| KWIKXR |
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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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| macxr8 |
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Age: 55 Posts: 451 Joined: 3rd Jan 2005 Ride: AU XR6 with BF Turbo engine Location: Sydney |
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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| danbode |
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Age: 37 Posts: 708 Joined: 19th Jul 2005 Ride: 08 BF MK11 Fairmont Ghia Location: Manly west |
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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| macxr8 |
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Age: 55 Posts: 451 Joined: 3rd Jan 2005 Ride: AU XR6 with BF Turbo engine Location: Sydney |
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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| danbode |
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Age: 37 Posts: 708 Joined: 19th Jul 2005 Ride: 08 BF MK11 Fairmont Ghia Location: Manly west |
Ohk fair enough, I would only trust my self with stuff like that on my car.
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| xr6berto |
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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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| cd11 |
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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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