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Joined: 30 Nov 2018
Posts: 58
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 Posted: Sun Mar 20, 2022 4:55 am Post subject: Piston questions |
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Under what circumstances are "normal" and "R1" pistons used?
If I have a cylinder overhauled, would the original piston be reused?
Is replacing a piston without overhauling an engine ever a possibility?
Can you have both normal and R1 pistons in one engine?
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richard.goode(at)russiana
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| Posted: Sun Mar 20, 2022 7:58 am Post subject: Piston questions |
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If an engine has been run for a reasonable time – let us say just 40 hours hours, then the standard pistons will be too small after the cylinder has been honed, and at that stage will need the first oversize – called R1.
So by definition this means that after an overhaul, unless the engine is effectively never used, you will need new and oversize pistons. And so the original pistons would not be reused. We have overhauled several thousand engines and never use original size pistons in these overhauls for this reason.
Logically there's no reason why standard and R1 pistons in one engine should not be used, except for piston weight. Most people don't realise that there is a complex procedure to allow for different piston weights – of course the assumption is that all the pistons in one engine are within a small variation the same weight. And so all the pistons together with rings pins plugs and half the connecting rod are weighed and there is a complex formula whereby weights can be adjusted in the counterbalance of the crankshaft. These are in the form of heavy bolts which are screwed into the counter weight. Of course very few people bother to do this but if it is done you will end up with a much smoother engine.
RICHARD GOODE AEROBATICS
Rhodds Farm, Lyonshall, Hereford, HR5 3LW, UK
Tel: +44 (0)1544 340120 Fax: +44 (0)1544 340129
e-mail: richard.goode(at)russianaeros.com
www.russianaeros.com
WORLD LEADERS IN RUSSIAN SPORTING AIRCRAFT & ENGINES
In partnership with Aerometal Kft, Hungary.
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