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cutting open a head

Old 12-30-2007, 07:28 PM
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Default cutting open a head

I'm picking up a messed up 99-00 for cheap. The cam bearings are scored, most likely due to a thrust bearing failure. I figure it could be opened up so that best porting could be determined. Anyone have a recommendation as to who is up for the job?

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Old 12-30-2007, 07:29 PM
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"cutting" as in... cutting it in half to view port design?? Just go to a typical machine shop with a large vertical band saw...
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Old 12-30-2007, 07:33 PM
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yup, taking a cross section to investigate the innards to determine best porting
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Originally Posted by concealer404 View Post
Buy an MSPNP Pro, you'll feel better.
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Old 12-30-2007, 07:34 PM
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Good ole bandsaw at a machine shop should make short work of it. Or a few cuts across each port so u can see the entire depth of the area, then do some cad work for later CNC porting work...
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Old 12-30-2007, 08:16 PM
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its already been done. 99 vs 97 IIRC.....whatever the case, its still a 99 in there.
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Old 12-30-2007, 09:00 PM
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Corky bell cut apart some miata heads, atleast one of them anyway. When they were doing the research for their coolant reroute for the H-EX car he was looking for messed up cheap heads to do that. He might be able to supply better pictures for you of what has already been done, if anything actually took place.
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Old 12-30-2007, 10:02 PM
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Originally Posted by Ben View Post
I'm picking up a messed up 99-00 for cheap. The cam bearings are scored, most likely due to a thrust bearing failure. I figure it could be opened up so that best porting could be determined. Anyone have a recommendation as to who is up for the job?

Ben
is that leatherface's messed up head? just wondering. I feel for the guy. Sucks to get screwed on something like that.
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Old 12-30-2007, 10:08 PM
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no it's a different head
leatherface's is worth saving

this head is salvagable too, but it would take a couple hundred worth of work
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Originally Posted by concealer404 View Post
Buy an MSPNP Pro, you'll feel better.
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Old 12-31-2007, 05:17 AM
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Originally Posted by Braineack View Post



its already been done. 99 vs 97 IIRC.....whatever the case, its still a 99 in there.
You don't remember which is which in that picture? Theres a HUGE difference. I'd guess the bottom is 99 judging by intake runner angle. I read somewhere the 94-97 is 23* angle and the 99 is supposed to be like 54 or 56*
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Old 12-31-2007, 06:58 AM
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the bottom is the '99 head. Check out the raised port, and "short side radius" just to start.

solomiata.com has the pics and info. HTH
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Old 12-31-2007, 11:16 AM
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Originally Posted by Braineack View Post



its already been done. 99 vs 97 IIRC.....whatever the case, its still a 99 in there.
Ya, those were my heads.

Mark
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Old 12-31-2007, 11:17 AM
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I should have some flow bench before/after data in the next couple weeks from my 99 headwork.
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Old 12-31-2007, 11:19 AM
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allright, if it's not needed, then it's not needed.

maybe someone wants it then? the cam bearings are f'd up, but can be fixed. if someone wants it for uber cheap, PM me.

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Originally Posted by concealer404 View Post
Buy an MSPNP Pro, you'll feel better.
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Old 01-01-2008, 07:05 PM
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I'll have it! For cost of shipping :P
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