Are all 1.8 Short blocks the same?
#1
Are all 1.8 Short blocks the same?
If anyone has any hot leads on a shortblock please email me clarkchristopher01@gmail.comWell I am back in the miata world! I picked up a 99 with a hole in the block, head appears to be good (im sure metal is stuffed in the oil galleys in the head but that will all be taken care of)
Question is all 1.8 short blocks the same. I will be rebuilding it so realistically is the block and crank the same, and with my 99' head what are the variances in compression ratio (I will probably shave .0020 off to give a little bump)
Question is all 1.8 short blocks the same. I will be rebuilding it so realistically is the block and crank the same, and with my 99' head what are the variances in compression ratio (I will probably shave .0020 off to give a little bump)
#3
94s and early 95s have 8.8 comp, 96-97 have 9.0 comp, some NBs had 9.5 comp, some had 10.0 comp, etc.
As Flounder mentioned, 94s and 95s have an oil and water feed for the turbo located in the block. There's a few other minor/major differences, such as a MBSP (01+) and whatnot, but you should visit the search button for yourself.
As Flounder mentioned, 94s and 95s have an oil and water feed for the turbo located in the block. There's a few other minor/major differences, such as a MBSP (01+) and whatnot, but you should visit the search button for yourself.
#4
A general rule of thumb, for every .007 milled off a head it closes the combustion chamber up by 1cc
Just going in and milling a head for a bump in compression is a haphazzard way of doing things, on a push rod engine it is simple, but with a DOHC things start changing that you may not be aware of. the big one is changing the cam center line to crank centerline relationship. This can have an affect on the mechanical timing of the engine.
Just going in and milling a head for a bump in compression is a haphazzard way of doing things, on a push rod engine it is simple, but with a DOHC things start changing that you may not be aware of. the big one is changing the cam center line to crank centerline relationship. This can have an affect on the mechanical timing of the engine.
#5
I'm confused about why you want to shave the head though. You say you're going to rebuild the bottom end -- I'd think it would make more sense to buy the pistons that have the compression ratio you want, rather than try to band-aid it by shaving the head?
--Ian
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