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| stockstandard |
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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  But its un-noticable to naked eye I thinkI 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. 
_________________ Stoke me a clipper, I'll be back for Christmas |
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| phongus |
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25 thou of an inch doesn't sound much :S but if it works im still going for it
_________________ phongus = Post whore 2006 |
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| tickford_6 |
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Posts: 6449 Joined: 11th Nov 2004 |
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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| John_xr6 |
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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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| phongus |
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i hate engineering.
_________________ phongus = Post whore 2006 |
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| Gaz |
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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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| Xflow |
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Age: 36 Posts: 721 Joined: 31st Dec 2005 Ride: EF V8 Futura, 180sx Location: Brisbane, Burpengary |
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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| stockstandard |
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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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| smiley235 |
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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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| Xflow |
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Age: 36 Posts: 721 Joined: 31st Dec 2005 Ride: EF V8 Futura, 180sx Location: Brisbane, Burpengary |
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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| phongus |
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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.
_________________ phongus = Post whore 2006 |
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