Supertech p/wall clearance
#1
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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...
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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#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.
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.
#14
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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.
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.
#15
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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.
#17
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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.
So you and him should be able to see things eye to eye.
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do not **** me off.
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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.
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.