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Buellistic
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PostPosted: Wed May 25, 2011 6:55 pm    Post subject: An interesting development Reply with quote

The engine a picked up to rebuild into a 1776cc is apparently already a 1776...

I was looking at the heads today and thinking to myself "How are they going to bore these out? There's not much meat there..." so I measured the bore. It was 96mm or so (just had a ruler on me).

I feel like it's a case of too good to be true, so I have to ask. Is 96mm the right bore for the 90.5mm p&c's? I measured the cylinder's inner diameter and it's 90.5. That means about 5.5mm of cylinder wall.

I guess my last question is how to tell if the old pistons and cylinders are in good enough shape to re-use.
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modok
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PostPosted: Wed May 25, 2011 7:07 pm    Post subject: Reply with quote

90.5 cylinders are 98 mm at the top
the stock cylinders fit a 94mm hole

There was one kind of machine-in 88 made that would fit a 96mm hole, but it isn't likely you have those.

better check again
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nsracing
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PostPosted: Wed May 25, 2011 7:19 pm    Post subject: Reply with quote

If you see a ridge up top on the inside of the cylinder then you have a well-worn engine. The pistons might still be okay, if the cylinders are worn might as well buy new set P/Cs.

Tear it all the way down and see if it is loaded on the lower end too. Are the heads big valves?

Might even have a cam and good oil pump in there.


Last edited by nsracing on Wed May 25, 2011 7:48 pm; edited 1 time in total
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Buellistic
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PostPosted: Wed May 25, 2011 7:34 pm    Post subject: Reply with quote

Yeah, I got it figured out. Never trust a 13 year old to measure ANYTHING.

I don't have a garage where I live, so I just have the heads. The rest is waiting to be torn down at my parents' house. I asked my younger brother to measure the inner diameter of the cylinders and he said 9cm.

He measured the wrong part.

My mother measured it and got 85-86mm inner diameter.

Damn.
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RockCrusher
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PostPosted: Wed May 25, 2011 7:37 pm    Post subject: Reply with quote

Your brother will make a fine carpenter someday but not a cabinet maker coz they use the "little" marks on the ruler while the carpenters only use the big marks.........

RC
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Perranfulo
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PostPosted: Wed May 25, 2011 7:40 pm    Post subject: Reply with quote

Always trust your mother, never trust your brother--fact of life! Laughing
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nsracing
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PostPosted: Wed May 25, 2011 7:51 pm    Post subject: Reply with quote

Why don't you just scrape the top of the pistons. There will be mark or size stensiled on there.

Might not be 90.5mm but a 85.5mm (stock 1600cc)
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mark tucker
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PostPosted: Thu May 26, 2011 12:37 pm    Post subject: Reply with quote

nsracing wrote:
Why don't you just scrape the top of the pistons. There will be mark or size stensiled on there.

Might not be 90.5mm but a 85.5mm (stock 1600cc)
too easy .
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