Emgo piston rings. Good or bad? - Page 2 - Triumph Forum: Triumph Rat Motorcycle Forums
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post #11 of 21 (permalink) Old 09-18-2011, 07:56 AM
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Quote:
Originally Posted by motobob View Post
I don't know if they are still marketed as Hepolite. They were absorbed by Federal-Mogul.
I just got a set in for a 750 and they are marked AE-Federal Mogul, no Hepolite name mentioned on the packing.
My Nural sets are also part of that Federal-Mogal. In the end, I guess it's now one conglomerate making many of the pistons. Not so good for technological advances if you have no competition.





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Last edited by triumpt120rv; 09-18-2011 at 07:58 AM.
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post #12 of 21 (permalink) Old 09-18-2011, 11:26 AM
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Do all the replacement parts meet the spec in the workshop manual? After all, a Hepolite ring need only fit a Hepolite piston on the face of it.

DerryUK

'69 T100S being rebuilt - very s-l-o-w-l-y - some say stopped!
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post #13 of 21 (permalink) Old 09-18-2011, 06:14 PM
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The place where "Hepolite pistons" were made (Bradford UK) shut years ago,the name was taken over by AE then Federal Mogul then it moved to Germany under the name Goetze and Nuller.
The Hepolite name has now been sold to Wassel (UK) they now package all there piston and ring sets under the Hepolite name,pistons are JCC and the rings are made in the USA .
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post #14 of 21 (permalink) Old 09-18-2011, 07:21 PM
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So Hepolite pistons are actually JCC's? I guess the JCC rings might work ok then.
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post #15 of 21 (permalink) Old 09-19-2011, 03:45 PM
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No worries mentioning other suppliers here, this is a Triumph forum, and all sources are appreciated.

For what it's worth, I've used plenty of Emgo / JCC rings with 100% success.

Keys: .0045 piston/bore clearance, .010 ring end gap

My race bike is a prime example of putting to rest any negative criticism:
2007 - built the race bike
-Light break-in with about 1/2 tank of gas
-Immediately went to track school and thrashed out 12 hard laps with no oil reaching the top end (plugged rocker feed); cleared the blockage
-Practiced & raced Sandia Classic, practiced & raced Barber's
-changed oil (looked like new)
2008 -Practiced and raced Roebling Road, Daytona, Road America & Grattan
-changed oil (still looked almost new)
-Ran once down the Bonneville Salt Flats
-Practiced and raced Miller, Sandia & Barber's
-changed oil (fairly clean, but a bit dusky)
2009 - Made 2 passes at the Texas Mile
-Practiced and raced Willow Springs & Barber's
-changed oil (almost like new)
in between all of the above, I've played around with the bike, ridden it to bike shows and around the neighborhood blasting it and abusing it with wheelies, etc.

I can go out there right now, start it in 1 or 2 kicks and it won't puff a hint of smoke from start-up right to red line, even when decellerating hard or power shifting. Compression is virtually the same as it was from the initial start-up.

And to put a few other myths to rest, I LIGHTLY oil the pistons, rings & cylinders with 10/30 Castrol (I run 10/40). I'm talking about dipping 3 fingers in a puddle of oil and tapping it onto the surfaces more or less evenly.

This is pretty much the way I've done every engine I've ever built in 35 years since my first (over 60 engines), and I have yet to have a reported ring or oil-related failure. The one smoking report I've gotten was a Norton, and due to an intake valve guide seal.

Say what you want, criticise to your hearts content, THESE ARE FACTS.

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post #16 of 21 (permalink) Old 09-19-2011, 03:48 PM
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Quote:
Originally Posted by motobob View Post
So Hepolite pistons are actually JCC's? I guess the JCC rings might work ok then.
No, EMGO are JCC (as are Cycle Craft, I believe)

Federal Mogul are essentially Heoplite (although it has more to do with the AE cast bits)

Wassel's "Hepolites" are re-branded JCC and I'm betting DO NOT have the traditional AE casting marks... (I could be wrong)

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post #17 of 21 (permalink) Old 09-19-2011, 03:54 PM
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You have to be careful with mixing & (not) matching rings and pistons.

It hasn't anything to do with the actual bore diameter / end gap, or the THICKNESS of the rings (to fit in the grooves), but rather the WIDTH of the rings from O.D. to I.D. and the depth of the piston's grooves.

Some pistons have shallower grooves and are mated with narrower width rings, so fitting a wider ring will result in the entire o.d. of the ring protruding significantly from the piston's goove even when compressed as much as possible.

I don't think narrower rings will work AS WELL in deeper grooves, either, but I've never tried it.

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post #18 of 21 (permalink) Old 09-20-2011, 01:21 AM
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GPZ-- Good to hear about your experiences with the JCC rings.

For years, I have been hearing about how bad they were, but never from anyone who had actually used them. I have had my doubts and only recently used them because I couldn't readily get the more expensive rings to fit .030 pistons and decided to take a chance on the JCC's. I sure like the price a lot better.
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post #19 of 21 (permalink) Old 09-20-2011, 01:42 PM Thread Starter
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Quote:
Originally Posted by GrandPaulZ View Post
You have to be careful with mixing & (not) matching rings and pistons.

It hasn't anything to do with the actual bore diameter / end gap, or the THICKNESS of the rings (to fit in the grooves), but rather the WIDTH of the rings from O.D. to I.D. and the depth of the piston's grooves.

Some pistons have shallower grooves and are mated with narrower width rings, so fitting a wider ring will result in the entire o.d. of the ring protruding significantly from the piston's goove even when compressed as much as possible.

I don't think narrower rings will work AS WELL in deeper grooves, either, but I've never tried it.
I found a set of NOS Hepolite .020 rings. I was wondering about mixing brands too.
The bike shop where I bought them assured me it was ok but they gave me bad advice once before. Usually they are right on the money.
So I'm going to sell the Emgo rings for whatever I can get for them.
Better safe than sorry.

Last edited by danpos; 09-20-2011 at 01:46 PM.
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post #20 of 21 (permalink) Old 09-20-2011, 01:50 PM
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Timing of this thread could not be better. I have new EMGO pistons at 0.060 over and Hastings rings. Never thought for a second that the rings might have the wrong ID for the pistons. Guess I'll be checking that before I install them. Although my buddy has been using the EMGO pistons and Hastings rings fo a while.

regards,
Rob
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