reboring cylinder

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I got the GPM pistons fitted with rings and all from RGM a few years ago and they've been working fine for me.
 
marinatlas said:
Hi Piero, I had used many JCC pistons(and all that big family: emgo etc) they are very good IF used with three pieces oil ring, at the start I had used the one supplied in the box (the one piece) and bad luck with them (smoke), now I still used them (from Carl Hockanson, as he supplied them with good three piece oil ring (may be hastings??), and they are cheap..........my two cents
Click to expand...

Hi,
Please, could you give me the address. Of your three piece oil ring seller?
Thanks.
Cio.
Piero
 
following the thread started by Piero..

I still have stock pistons and cylinder which had to be just honed..

can you tell me the ultimate rings to use?

What about Hastings? are they good or just a cheap solution?
Would be better to find NOS Hepolites?
what about those which are sold at Norton Andover?

Thank you for your suggestions!
 
Before you start machining the oil ring groove, check the centre expander ring - I've fitted 2 sets of the Hepolite (Hastings) rings, and for whatever reason I've needed to remove a fair amount off the end to ensure an adequate gap.
The top and Bottom thin rings were the right gap, so you may want to check them without the centre expander fitted to be sure.
I'm happy to use these rings, no problem, but 'some fitting required'
 
B+Bogus said:
Before you start machining the oil ring groove, check the centre expander ring - I've fitted 2 sets of the Hepolite (Hastings) rings, and for whatever reason I've needed to remove a fair amount off the end to ensure an adequate gap.
The top and Bottom thin rings were the right gap, so you may want to check them without the centre expander fitted to be sure.
I'm happy to use these rings, no problem, but 'some fitting required'
Click to expand...

Andy, your advise may be slightly misguided, the innerspring expander should butt together, it applies the tension to the oil ring,the rails often have large gaps.
Assemble the oilring on the piston and try in the bore, the piston should still be able ''float'' around the oil ring, the oil ring shouldn't be grabbing the piston. Place a ruler along the piston skirt, do all the rings fit below the ruler.
Wanting to use genuine Hepolite pistons and rings? I reckon the JCC piston is as good or better, the rings are simple a design and no worse than the originals, only fault I have seen is the circlips were 17mm not 11/16'' and to loose in the groove
 
splatt said:
B+Bogus said:
Before you start machining the oil ring groove, check the centre expander ring - I've fitted 2 sets of the Hepolite (Hastings) rings, and for whatever reason I've needed to remove a fair amount off the end to ensure an adequate gap.
The top and Bottom thin rings were the right gap, so you may want to check them without the centre expander fitted to be sure.
I'm happy to use these rings, no problem, but 'some fitting required'
Click to expand...

Andy, your advise may be slightly misguided, the innerspring expander should butt together, it applies the tension to the oil ring,the rails often have large gaps.
Assemble the oilring on the piston and try in the bore, the piston should still be able ''float'' around the oil ring, the oil ring shouldn't be grabbing the piston. Place a ruler along the piston skirt, do all the rings fit below the ruler.
Wanting to use genuine Hepolite pistons and rings? I reckon the JCC piston is as good or better, the rings are simple a design and no worse than the originals, only fault I have seen is the circlips were 17mm not 11/16'' and to loose in the groove
Click to expand...

Nope, I'm sticking with what I said. I simply could not get the piston into the barrel until I took metal off the expander ring. Simple as.
Second time around I was expecting it, and it was the same.
 
Any suggestion on where to find Original NOS Hepolite piston rings?
Click to expand...

Yeah I do, you collect the phone and emails of the world wide British Iron vendors
and call them up directly to get insights and parts galore that the private upgraders or special after market vendors have no access or knowledge of. With a crappy enough problem restoration they may even get to point of greeting you on phone by voice recognition alone with " OH Hey there 'Easy Money'...
 
[

Nope, I'm sticking with what I said. I simply could not get the piston into the barrel until I took metal off the expander ring. Simple as.
Second time around I was expecting it, and it was the same.[/quote]

Then the rings are wrong and should not be supplied and fitted
 
splatt said:
Wanting to use genuine Hepolite pistons and rings? I reckon the JCC piston is as good or better, the rings are simple a design and no worse than the originals, only fault I have seen is the circlips were 17mm not 11/16'' and to loose in the groove
Click to expand...

Hasn't it been discussed here recently that 'genuine' Hepolite stuff is apparently being made by JCC,
and packed into Hepolite cartons.

Someone spelled out some differences in the colors on the cartons to spot which is which.
Supplies of Hepolite stuff mostly dried up, decades ago ?
 
The link should explain the current Hepolites.

http://fagengine.com/category/pistons/

I brought a set of UK Hepolites for a TR5T last year,the general consensus (with Triumphs anyway) was the Asian pistons were fine but the rings not so good,hard to bed in (smoking) seemed to be common.
It looks like that has been eliminated in non Hepolite pistons now by better rings which might even be Hastings also.
 
Rohan said:
splatt said:
Wanting to use genuine Hepolite pistons and rings? I reckon the JCC piston is as good or better, the rings are simple a design and no worse than the originals, only fault I have seen is the circlips were 17mm not 11/16'' and to loose in the groove
Click to expand...

Hasn't it been discussed here recently that 'genuine' Hepolite stuff is apparently being made by JCC,
and packed into Hepolite cartons.

Someone spelled out some differences in the colors on the cartons to spot which is which.
Supplies of Hepolite stuff mostly dried up, decades ago ?
Click to expand...


He was looking for NOS Hepolite rings
 
B.Rad said:
I purchased a set of pistons with rings from Domiracer(yes, I know). They came with 0ne piece oil rings. I am assuming that the pistons are JCC. They came with NO documentation

I dont want to use the one piece oil ring. I have an set of NOS "apex type 3 piece" oil rings. genuine AE rings.

when attempting to fit the AE oil rings to the alleged JCC pistons, I discovered the depth of the oil ring groove was shallow by about 20 thou. the thin top and bottom oil rings stand proud of the piston and will not go into the bore. I need to deepen the ring groove by about 15/20 thou it seems. andf yes, the rings were fitted correctly. I had an engine reconditioner look at this and the grooves are indeed shallow. The engine bloke says the pistons are quite usable as far as sizes go except for the oil ring groove. they are a about a bit smaller than old hepolite pistons above the top ring groove but he says they are still OK to use.

have I got JCC pistons or something really nasty.

has anyone else run across this.

Kind regards to all Bradley
Click to expand...

I'm not positive about what I'm going to say but if the grooves are .020" short I think you have to cut them more than .020". There needs to be some clearance to allow the rings to move in the grooves.
 
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