Piston cylinder in new engine

tru168 Wed Aug 06, 2014 11:57 pm

Hi,

I noticed that every time when new piston/cylinder set I installed, or brand new engines, ( later version, ) give me gritty feel when I turn the engine by hand slowly, just like something is grinding in cylinder, and gone after run-in. I checked new cylinder under magnifying glass and can't see any abnormal or debris in cylinder. After run in for couple of tanks , I can see shiny lines on piston.

I unpacked one of my new old stock TD051 and try to turn and no gritty feel .

Is that normal? What is grinding ? I suspect it's the exhaust opening which left sharp edges in inner cylinder?

Anyone of you noticed this ?

I'm thinking that if I can remove the problem before I run-in my new engine, my piston / cylinder will match more precisely and gain performance?

Ew

**RknRusty** Thu Aug 07, 2014 1:31 am

I have two new of the Tee Dee .049 sets, the ones that have had the exhaust lowered and the bar removed from the slit. They feel like you described. I put them in a drawer for later, but won't install them before further inspection to confirm the source of the grittiness. I just haven't looked yet. But it certainly needs to be addressed. It may be some residue from the machining around the exhaust ports. If that's the case, I may push the pistons in from the top, upside down to see if that clears it. Are yours modified exhaust like BW or TD, or just plain Surestarts?
Rusty

tru168 Thu Aug 07, 2014 2:02 am

Hi Rusty,

It's normal unmodified surestart cylinder. I did clean it in methanol, but still the same problem, almost all new cylinder that I have having the same problem, older (pre-Estes) seems no problem , but not sure because I only have two really old but new in box engines without the problem described.

Surfer_kris Thu Aug 07, 2014 2:11 am

Unfortunately the later production engines, the "Sure start" models, are not of the same quality as the ones that once made Cox famous...

balogh Sat Sep 13, 2014 1:19 am

Yeah in some Surestarts I found aluminum grits so I tended to dismantle and flush the post Estes stuff before I decided to afford antique COX TD-s sold on ebay.

Jason_WI Sat Sep 13, 2014 1:33 am

Most likely flash on the milled slots in the cylinder. The cylinders are really soft compared to the pistons. Steel wool will remove it or just run it. The one or two NIB engines I have are smooth as butter when turned over.

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