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Post  Marleysky Sun Mar 27, 2022 9:52 pm

Hey! I recently got a Fox 049. Bought some gaskets and stuff from Matt at EX-Model Engines to make it look operational. Except...it has a large dimple on the top dead center of the piston! Can anyone advise if this is “normal” or is the con-rod about to push thru the top of the piston?? I kinda think its normal because of the Fox add I found showing a raised bump on the piston:

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Mone:
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Post  Cribbs74 Sun Mar 27, 2022 10:04 pm

I don’t know if that is normal or not. I have two Fox .049’s and one .07 and none of them have a raised bump. In your picture it does look like it was machined that way. If it is indeed a poor fitting con rod then it will have an audible click when turning over and if disassembled it will be obvious if it’s pushing through.
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Post  Ken Cook Mon Mar 28, 2022 4:06 am

The identifier for the .049 piston is the raised bump. The .07 is a flat top. The piston isn't poking through. The piston is cast and it will shatter like a piece of glass if you try and reset it. The identifier for the cylinder is the base thickness at the bottom, the .049 has a thick base and the .07 has a very thin base due to it's longer stroke. The other is the amount of cooling fins, the .049 has 9 fins whereas the .07 has 7. I could also be reversing those numbers as I always forget but one has more fins.
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Post  Oldenginerod Mon Mar 28, 2022 4:18 am

I believe the "bump" is actually some sort of rivet. It is a sure way to distiguish the .049 from the .07.
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Post  Marleysky Mon Mar 28, 2022 2:55 pm

THANKS GUYS!   It seem that the OEM (FOX) used a rivet to assemble the piston and Con-rod Socket together, so the dimple is OK. I do remember reading your post Ken, on how you shattered a piston in a attempt to re-set the ball socket, so I'm definitely NOT gonna do that!lol!
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Post  EXModelEngines Tue Mar 29, 2022 3:09 pm

Oldenginerod wrote:I believe the "bump" is actually some sort of rivet.  It is a sure way to distiguish the .049 from the .07.

Correct as the piston and socket were made separately. I'll try to dig out some of the socket parts. There were a small handful when we bought all the parts from Doug Martin.
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