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Home > Help Needed / General Tech Chat > Cylinder Bore Sizes

colas

567 Posts
Member #: 102
Post Whore

Pennsylvania USA

5th Jan, 2010 at 12:18:55am

Hi Everyone

I'm currently going through my engine as it was smoking a little on over run and start up. Just checked the bores and they measure as follows. 1 70.61, 2 70.65, 3 70.64, 4 70.63. All are mm's. Is this within tollerance or does it need a rebore. I done a compression check before strip down when hot and they were all good and the same. I can still see the honing marks in the bores. It also looks like a linered engine.

Thanks

Nick

wil_h

User Avatar

9258 Posts
Member #: 123
Post Whore

Betwix Harrogate and York

5th Jan, 2010 at 08:08:37am

Smoking on overrun and startup is almost always valve guides. If compression is good then even more likely.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph



On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination,
talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol

On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry.


colas

567 Posts
Member #: 102
Post Whore

Pennsylvania USA

5th Jan, 2010 at 08:36:50pm

Yeah I'm doing the head with new guides and valves just wanted to check the block while it was out also.

wil_h

User Avatar

9258 Posts
Member #: 123
Post Whore

Betwix Harrogate and York

5th Jan, 2010 at 09:12:23pm

The haynes has the standard bore sizes in with the tollerances.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph



On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination,
talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol

On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry.

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