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Piston to bore clearance advice

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coopar

Post subject: Piston to bore clearance advice

Posted: Wed Jul 11, 2012 4:30 pm

848cc

Joined: Tue Apr 05, 2011 9:48 pm
Posts: 464
Location: Gisborne VIC

My block is about to go out to 1380 to suit a set of pistons I have.
These pistons were run in on another motor then ripped out a couple of hundred kms later.

The machine shop wants to know what piston to bore clearance they should use in the new work.

Advice?
Whats normal?
2 thou?

Cheers

_________________
Tim

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drmini in aust

Post subject:

Posted: Wed Jul 11, 2012 4:36 pm

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39764
Location: near Baulkham Hills, NSW

What brand are they?
Forged or cast?

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:

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coopar

Post subject:

Posted: Wed Jul 11, 2012 4:44 pm

848cc

Joined: Tue Apr 05, 2011 9:48 pm
Posts: 464
Location: Gisborne VIC

Omegas
Not sure forged or cast.

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Tim

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TheMiniMan

Post subject:

Posted: Wed Jul 11, 2012 4:46 pm

Bimmer Twinky

Joined: Mon Sep 06, 2004 4:36 pm
Posts: 8606
Location: Brisbane

you will need to find out & adhere to the manufacturers specs for clearance

_________________
No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

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coopar

Post subject:

Posted: Wed Jul 11, 2012 6:37 pm

848cc

Joined: Tue Apr 05, 2011 9:48 pm
Posts: 464
Location: Gisborne VIC

Cheers

_________________
Tim

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low n blown

Post subject:

Posted: Wed Jul 11, 2012 9:36 pm

1098cc

Joined: Tue Aug 24, 2004 3:57 pm
Posts: 1478
Location: queensland

Depends on the application. Race engine use slightly more clearance.

_________________
1970 Cooper S ex-Bathurst & ATCC
1964 Austin Cooper S ex-Group C race car
1967 Morris Cooper S ex-Group B
1962 Mini Speed sports sedan
1968-71 ex-Peter Manton Shell car

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