KY engine bore size

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thenomadcat
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KY engine bore size

Post by thenomadcat »

Hi,

Does anyone know the actual piston/bore size for the 1.7D KY engine?

I'm looking for the correct match for the second repair oversize. That is 1mm oversize, I believe. I want to order the pistons from tornau-motoren.de and they say the size is 80.51mm. Is this the actual piston size, or the size of the bore?

https://www.tornau-motoren.de/kolben/ko ... iston.html" onclick="window.open(this.href);return false;

Any help or advice is much appreciated.

Thanks,
Andrei

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tobydog
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Re: KY engine bore size

Post by tobydog »

I'd say it's the bore size.

Zylinderbohrung 80,51 mm / Bore size

https://translate.google.co.uk/?hl=en#a ... derbohrung" onclick="window.open(this.href);return false;

Hole based fit, clearance is allowed on the shaft/piston. When a hole/bore is machined it goes size to oversized. The piston manufacturer includes the running clearance.
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bigherb
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Re: KY engine bore size

Post by bigherb »

That would be the bore size, as stock is 79.5mm, pistons are smaller and are not perfectly round.
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tobydog
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Re: KY engine bore size

Post by tobydog »

As bigherb, cold, the pistons measure smaller in line with the small ends. When hot, the pistons expand/distort to become round.
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thenomadcat
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Re: KY engine bore size

Post by thenomadcat »

Thanks a lot, it's clear now.

I have to start researching the crankshaft, or how to get it into the best possible shape :)

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