[SEL] Piston Ring Gap

[Luke Tonneberger]

Hi Rupert,

I have plenty of WD-40 so that is what I'll use for lube. The piston does 
fit in the bore but barely. I don't want to force it.  I have just finished 
boring out the cylinder, but haven't honed yet. I'll hone as little as 
possible to remove the boring/tooling marks then file my rings to get the 
necessary gap (as was suggested off list).  Thanks everyone.

Luke Tonneberger
Rockford, Michigan
USA
===============

>From: Rupert Wenig <rwenig at telus.net>
>
>Hello Luke,
>	Are you saying the piston already fits the cylinder bore? If so, then 
>simply file the ends of the rings to get proper end gap clearance. Piston 
>to cylinder wall clearance and the ring end gap are determined by the 
>diameter of the bore and the temperature the engine operates at. It's been 
>a long time since I've had to know this so any tables I have are buried 
>deep.
>
>	Kerosene is recommended in my books to use as a lubricant when cutting 
>aluminum but I prefer to use WD40.
>
>Rupert
>
>Luke Tonneberger wrote:
>
>>Hi Jack,
>>
>>It is air cooled with an aluminum piston. It is for a model I'm attempting 
>>to make. I have the bore close to finish size. The piston fits, but the 
>>rings don't fit yet.  I put in a piston ring and can't quite get the ends 
>>to meet. The bore is too small yet so the ends of the ring overlap a bit. 
>>I need to hone it out about .015 inches I'm guessing. I'm using the end 
>>gap on the rings to determine what my finished bore size will need to be 
>>and how much I'll need to hone it. I've read a little on how to hone, but 
>>not sure what to use for cutting fluid.
>>
>>Luke Tonneberger
>>Rockford, Michigan
>>USA