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wtf is head shaving? 

 

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 Post subject: Re: wtf is head shaving?
Posted: Mon Aug 14, 2006 2:55 pm 
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eb_guy888 wrote:
phongus wrote:
do u literally shave the head evenly like ur planing a plank of wood?


sorta mate :P But its un-noticable to naked eye I think

I had my old head shaved about 25thou I think, Im pretty sure thats about 25thousands of a mil or somethin? Not completely sure but u wouldnt be able 2 do it by hand with a planer lol


Its 25 thou of an inch, which is about 0.5mm

the actual machinine that does it looks like this. Basically a big mill that lowers the grinding surface onto the head.

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Posted: Mon Aug 14, 2006 4:43 pm 
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25 thou of an inch doesn't sound much :S but if it works im still going for it

 

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Posted: Mon Aug 14, 2006 8:09 pm 
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Gaz wrote:
just outta interest, how high compression would people go on a NA engine safely?

would 11:1 be unreasonable if you ran 98RON on the standard competeR?



ive found that a wide open throttle 10.5:1 with a stock ecu and an RPD r1 cam is fine. at part throttle it pings like a b**ch.

you can't realy just put a number on it and say NO MORE, it just doesn't work like that.

 

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Posted: Mon Aug 14, 2006 8:11 pm 
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phongus wrote:
25 thou of an inch doesn't sound much :S but if it works im still going for it


it doesnt sound much but in engineering terms its huge!

when i used to hone out the cylinders at my old work we had to get the whole cylinder size from top to bottem within 2 tenths of a thou.

 

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Posted: Mon Aug 14, 2006 8:16 pm 
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i hate engineering.

 

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Posted: Mon Aug 14, 2006 8:17 pm 
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tickford_6 wrote:
Gaz wrote:
just outta interest, how high compression would people go on a NA engine safely?

would 11:1 be unreasonable if you ran 98RON on the standard competeR?



ive found that a wide open throttle 10.5:1 with a stock ecu and an RPD r1 cam is fine. at part throttle it pings like a b**ch.

you can't realy just put a number on it and say NO MORE, it just doesn't work like that.


is that using 98 ron or just regular?

doubt my head gasket will go before i sell the car, but if it does, wanna have an idea what what to aim for.

 

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Posted: Mon Aug 14, 2006 11:17 pm 
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not trying to hijack the forum but what would be the best compression ratio for a 250 crossflow runnning high boost like 25-30 PSI????? and would i be able to achive this ratio with stands stroke ratio of crank and con rods and just shave head
thx

 

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Posted: Mon Aug 14, 2006 11:23 pm 
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Xflow wrote:
not trying to hijack the forum but what would be the best compression ratio for a 250 crossflow runnning high boost like 25-30 PSI????? and would i be able to achive this ratio with stands stroke ratio of crank and con rods and just shave head
thx


whoa thats a crap load of boost!!!

youll need forged pistons with some serious dish (7.5:1) and prey it holds. Id be talking to an respected performance engine builder for that kind of advice.

 

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Posted: Mon Aug 14, 2006 11:33 pm 
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stockstandard wrote:
Xflow wrote:
not trying to hijack the forum but what would be the best compression ratio for a 250 crossflow runnning high boost like 25-30 PSI????? and would i be able to achive this ratio with stands stroke ratio of crank and con rods and just shave head
thx


whoa thats a crap load of boost!!!

youll need forged pistons with some serious dish (7.5:1) and prey it holds. Id be talking to an respected performance engine builder for that kind of advice.


with boost levels that high, its a given that the pistons and rings must be upgraded. What about other components that are in direct contact with the combustion such as the engine block, head, and valve seats, spark plugs? I think I can assume the block would be tough enough but what about the softer aluminum alloy? Also, collateral components such as timing chains, and cranks?

 

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Posted: Tue Aug 15, 2006 12:12 am 
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LOL

ive got forged pistons 20thou
im looking into el crank
ive got hemi 365 con rods
ive got an aftermarket 7 point timming chain
ive got dual valve springs
ive got drag cam
ive got 1000cc injectors

getting titainum valve springs not sure what size yet
getting titainum valve locks
getting push rods no decided yet
getting ford clevland V8 roller rockers haven't decided what ratio yet
getting aftermarket fuel regulator
getting boash 088 fuel pump
redesigning intake system
Custom designed extractors
custom exhaust system with Y flange with gate to open a dump pipe or full exhaust system with mufflers and cat

now back to topic lol

 

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Posted: Tue Aug 15, 2006 1:27 am 
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wow xflow....sounds like its going to be a great engine =D and ive only heard cars running boost at 11 and thats pushing it...20-25? wtf.

and ur not really hi-jacking...it is a thread about shaving heads after all.

 

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Max Power = 144.6 rwkw (03/05/2008)

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