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by 944_Jim Wed Mar 27, 2024 10:14 pm
Cox .049 p/cylinder ?
Page 1 of 1
Cox .049 p/cylinder ?
Can the piston be enlarged on a typical .049?To tighten up the fit in the cylinder.
Jim
Jim
oldguy- Gold Member
- Posts : 368
Join date : 2015-12-10
Age : 70
Location : Idaho
Re: Cox .049 p/cylinder ?
I do not think so..I do not know about any reliable technology that would expand the very accurately manufactured, small piston such that it remains loose enough to run in the cylinder unobstructed and enhance compression as well.
Piston balljoint resetting sometimes leaves - erroneously - the piston crown "mushroomed" i.e. a bit expanded if the resetting is done too tough, but this typically results in such a tight fit that the piston/cylinder combo remains useless.
But I invite the more experienced COX engine lovers to offer some more promising reply to your question.
Piston balljoint resetting sometimes leaves - erroneously - the piston crown "mushroomed" i.e. a bit expanded if the resetting is done too tough, but this typically results in such a tight fit that the piston/cylinder combo remains useless.
But I invite the more experienced COX engine lovers to offer some more promising reply to your question.
balogh- Top Poster
-
Posts : 4739
Join date : 2011-11-06
Age : 65
Location : Budapest Hungary
Re: Cox .049 p/cylinder ?
balogh wrote:I do not think so..I do not know about any reliable technology that would expand the very accurately manufactured, small piston such that it remains loose enough to run in the cylinder unobstructed and enhance compression as well.
Piston balljoint resetting sometimes leaves - erroneously - the piston crown "mushroomed" i.e. a bit expanded if the resetting is done too tough, but this typically results in such a tight fit that the piston/cylinder combo remains useless.
But I invite the more experienced COX engine lovers to offer some more promising reply to your question.
I accidentally mushroomed a piston once to where it was a super tight fit. I decided to go ahead and run it in and see what happened, it ended up being one of fastest runners.
In no way am I suggesting you try it, just sharing my experience.
Jim
JPvelo- Diamond Member
- Posts : 1969
Join date : 2011-12-02
Age : 56
Location : Colorado
Re: Cox .049 p/cylinder ?
JPvelo wrote:balogh wrote:I do not think so..I do not know about any reliable technology that would expand the very accurately manufactured, small piston such that it remains loose enough to run in the cylinder unobstructed and enhance compression as well.
Piston balljoint resetting sometimes leaves - erroneously - the piston crown "mushroomed" i.e. a bit expanded if the resetting is done too tough, but this typically results in such a tight fit that the piston/cylinder combo remains useless.
But I invite the more experienced COX engine lovers to offer some more promising reply to your question.
I accidentally mushroomed a piston once to where it was a super tight fit. I decided to go ahead and run it in and see what happened, it ended up being one of fastest runners.
In no way am I suggesting you try it, just sharing my experience.
Jim
Did you mushroom this piston resetting piston socket?
oldguy- Gold Member
- Posts : 368
Join date : 2015-12-10
Age : 70
Location : Idaho
Re: Cox .049 p/cylinder ?
oldguy wrote:JPvelo wrote:balogh wrote:I do not think so..I do not know about any reliable technology that would expand the very accurately manufactured, small piston such that it remains loose enough to run in the cylinder unobstructed and enhance compression as well.
Piston balljoint resetting sometimes leaves - erroneously - the piston crown "mushroomed" i.e. a bit expanded if the resetting is done too tough, but this typically results in such a tight fit that the piston/cylinder combo remains useless.
But I invite the more experienced COX engine lovers to offer some more promising reply to your question.
I accidentally mushroomed a piston once to where it was a super tight fit. I decided to go ahead and run it in and see what happened, it ended up being one of fastest runners.
In no way am I suggesting you try it, just sharing my experience.
Jim
Did you mushroom this piston resetting piston socket?
Yes
JPvelo- Diamond Member
- Posts : 1969
Join date : 2011-12-02
Age : 56
Location : Colorado
Re: Cox .049 p/cylinder ?
You could use fuel made with pure cheap pharmacy castor and bench run it until it gets enough varnish to tighten it up. Then forever run it on nearly pure castor fuel like Cox Super power, which is 18/2 castor/synthetic to maintain the varnish.
I've never done it, but I'd try that first.
Happy Birthday Oldguy
Rusty
I've never done it, but I'd try that first.
Happy Birthday Oldguy
Rusty
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while you're doing it!
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RknRusty- Rest In Peace
- Posts : 10869
Join date : 2011-08-10
Age : 68
Location : South Carolina, USA
Re: Cox .049 p/cylinder ?
Jim[/quote]
Did you mushroom this piston resetting piston socket?
[/quote]
When you hit the piston socket too hard while resetting, the socket flattens the piston top and it expands, slightly increasing the piston skirt diameter at the top. If you are lucky enough (but chances are very slim) the expansion is centrally symetrical and the top of the piston remains round, and if you can still tuck it into the cylinder, it may end up a tightly fit p/c combo.
Happy birthday !!!!
Did you mushroom this piston resetting piston socket?
[/quote]
When you hit the piston socket too hard while resetting, the socket flattens the piston top and it expands, slightly increasing the piston skirt diameter at the top. If you are lucky enough (but chances are very slim) the expansion is centrally symetrical and the top of the piston remains round, and if you can still tuck it into the cylinder, it may end up a tightly fit p/c combo.
Happy birthday !!!!
balogh- Top Poster
-
Posts : 4739
Join date : 2011-11-06
Age : 65
Location : Budapest Hungary
Re: Cox .049 p/cylinder ?
JPvelo wrote:balogh wrote:I do not think so..I do not know about any reliable technology that would expand the very accurately manufactured, small piston such that it remains loose enough to run in the cylinder unobstructed and enhance compression as well.
Piston balljoint resetting sometimes leaves - erroneously - the piston crown "mushroomed" i.e. a bit expanded if the resetting is done too tough, but this typically results in such a tight fit that the piston/cylinder combo remains useless.
But I invite the more experienced COX engine lovers to offer some more promising reply to your question.
I accidentally mushroomed a piston once to where it was a super tight fit. I decided to go ahead and run it in and see what happened, it ended up being one of fastest runners.
In no way am I suggesting you try it, just sharing my experience.
Jim
Lucky!
Chris...
stuntflyr- Gold Member
- Posts : 266
Join date : 2012-01-18
Age : 65
Location : Tucson, Arizona
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