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Old 08-27-2010, 11:07 PM   #1
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Default Supertech p/wall clearance

So what are you guys running for clearance? Seems like a lot of people run the .035 supertech says, but there are others (trackdayhooky, savington) that seem to run more clearance.

Lets hear some opinions. What should I run for an engine that will see a lot of track time and lots of HP...
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Old 08-27-2010, 11:19 PM   #2
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Open it up, but be warned that the motor will not last as long and break-in procedure is absolutely critical to ward off excessive blowby. My clearances are right around .004".
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Old 08-27-2010, 11:58 PM   #3
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How long are we talking here for engine longevity? And what kind of break in procedure would you reccomend? .004?

What I will most likely do is run the car N/A for break in. And have it trailered to the dyno from my place. Basically just turn it on at my place to make sure the car runs.
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Old 09-26-2010, 01:39 PM   #4
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You say "open it up", but .004" < .035" ?!
What's your break in procedure?
What about piston slap on cold starts? How bad is that?
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Old 09-26-2010, 03:52 PM   #5
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UMY enginee builder lauged when I said to go .004. He said there is no reason to and the engine will not last. It's currently with him and he is building it to .0025
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Old 09-26-2010, 07:23 PM   #6
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I went with a loose bore on mine at the advice of my builder. I have no piston slap when cold, minimal blow-by, and I just ran 2-days at 5-hours of seat time with 250-280* oil temps and never once added oil.

My machinist told me to break-in by driving it to the track. He does a finish on the cylinder walls that supposedly minimized the need for break-in. I cruised up to 60-mph then hit over-run about 10-times and that's it. I ran 200whp for a week then up to 260whp and its stayed there for a while.

I hope you don't plan to track that car with .025" of wall clearance...but the builder probably knows more than me, Savingaids, my engine builder, and probably just about anyone tracking a turbo Miata.
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Old 09-26-2010, 07:31 PM   #7
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0.0025" is tight, real tight. I'd run that on a NA motor but not something FI.
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Old 09-26-2010, 09:19 PM   #8
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Quote:
Originally Posted by neogenesis2004 View Post
0.0025" is tight, real tight. I'd run that on a NA motor but not something FI.


uHH
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Old 09-26-2010, 09:47 PM   #9
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Quote:
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0.0025" is tight, real tight. I'd run that on a NA motor but not something FI.
This dude's friend is smarter than you.
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Old 09-26-2010, 09:51 PM   #10
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FWIW the alloy that Supertech uses in their piston has a different coefficient of thermal expansion (CTE) than the alloy that Wiseco uses in theirs (at least for Miatas).
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Old 09-26-2010, 10:22 PM   #11
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Quote:
Originally Posted by ZX-Tex View Post
FWIW the alloy that Supertech uses in their piston has a different coefficient of thermal expansion (CTE) than the alloy that Wiseco uses in theirs (at least for Miatas).
As in Wiseco expands more, or less?
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Old 09-26-2010, 10:23 PM   #12
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You say "open it up", but .004" < .035" ?!
Uhhh. I think he meant .0035"
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Old 09-26-2010, 10:32 PM   #13
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Wiseco expands more IIRC.
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Old 09-26-2010, 11:17 PM   #14
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Quote:
Originally Posted by hustler View Post
I went with a loose bore on mine at the advice of my builder. I have no piston slap when cold, minimal blow-by, and I just ran 2-days at 5-hours of seat time with 250-280* oil temps and never once added oil.

My machinist told me to break-in by driving it to the track. He does a finish on the cylinder walls that supposedly minimized the need for break-in. I cruised up to 60-mph then hit over-run about 10-times and that's it. I ran 200whp for a week then up to 260whp and its stayed there for a while.

I hope you don't plan to track that car with .025" of wall clearance...but the builder probably knows more than me, Savingaids, my engine builder, and probably just about anyone tracking a turbo Miata.

It's being built as a track car. And he knows that. I'm not too concerned because he warranties his work. If anything happens in regards to piston scoring, I can always be like "hey... see I said we should have gone with a larger bore"... And break in with him consists of like 5000kms of driving with a 4500RPM limit and 1000km check ups with a borescope to make sure everything is doing it's job. Or something along those lines... he went over it briefly with me.
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Old 09-26-2010, 11:42 PM   #15
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Quote:
Originally Posted by falcon View Post
It's being built as a track car. And he knows that. I'm not too concerned because he warranties his work. If anything happens in regards to piston scoring, I can always be like "hey... see I said we should have gone with a larger bore"... And break in with him consists of like 5000kms of driving with a 4500RPM limit and 1000km check ups with a borescope to make sure everything is doing it's job. Or something along those lines... he went over it briefly with me.
I guess you're done asking questions and now you're telling us what you're doing? How much more reliable and stronger will your motor be than Savington's, thesnowboarder's, and mine? I guess this machinist knows something most don't since he insists on cutting the manufacturer's spec in half. What does he plan on checking with the bore scope? Lol @ oldschool break-in.
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Old 09-26-2010, 11:46 PM   #16
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He sounds exactly like you did Hustler. You went from asking questions for 2...no 3 years about everything. To being an utmost expert on all things FI overnight with the only thing on your resume being installing a BEGI turbo kit.

So you and him should be able to see things eye to eye.
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Old 09-26-2010, 11:50 PM   #17
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Quote:
Originally Posted by neogenesis2004 View Post
He sounds exactly like you did Hustler. You went from asking questions for 2...no 3 years about everything. To being an utmost expert on all things FI overnight with the only thing on your resume being installing a BEGI turbo kit.

So you and him should be able to see things eye to eye.

do not **** me off.
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Old 09-26-2010, 11:51 PM   #18
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Oh noes, I'm shaking in my boots....
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Old 09-26-2010, 11:55 PM   #19
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Oh noes, I'm shaking in my boots....
Lol @ Virginians in boots.

Claiming to be an expert on precision machine work and making fun of someone for cutting the tolerance spec in half are two different things.
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Old 09-27-2010, 12:06 AM   #20
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Quote:
Originally Posted by falcon View Post
it's being built as a track car. And he knows that. I'm not too concerned because he warranties his work. If anything happens in regards to piston scoring, i can always be like "hey... See i said we should have gone with a larger bore"... And break in with him consists of like 5000kms of driving with a 4500rpm limit and 1000km check ups with a borescope to make sure everything is doing it's job. Or something along those lines... He went over it briefly with me.
THREEEEEETHOUGHSANDFUCKINGMILESUNDER4500RPM??????? ?

That is the longest break in i have ever heard of.

what the ******* ****???


i have never even heard of an oem break in close to that long. Ridiculous.
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