ausmini :: View topic - Hepolite Pistons

The main problem with Hepolite pistons as I see it is that you are limited in the type of piston rings you can use, As far as I know only Hepolite rings fit the piston.
They are not Chrome or Molly top rings and the ring gap is way to large straight out of the packet.
If you chose to use Hypertec pistons you have a far greater choice of quality piston rings from different manufacturers, eg Grant or Hastings.These companys offer a choice of a cast, chrome or molly top ring which can be gaped to the correct size before fitting.
Dave

[quote="][/quote]
Nippon rings fit the Hypatecs too, I run them in my 1412 stroker. GR uses these in his own brand pistons.[/quote]

There you go Leema,
Looks like you have a trick set of pistons there :!:

20747 is "Econoguide Powermax" piston. Hepolite were the only piston manufacturer in the world to make this style of piston. On the thrust skirt of the piston there were 3 raided pads (less than.0005" high) that contacted the bore. These pads were formed when the piston was forged. This cut down friction.

You could not see these pads when the piston was new - only after the engine had been run for a couple of hours.

An extremely high quality piston.

Hope this helps.

Author:	leema [ Wed Feb 04, 2009 6:22 pm ]
Post subject:	Hepolite Pistons
Im currently Doing a rebuild and have a set of Hepolite 040 pistons Possibly High compression. I have been told that there quite a good piston. Im just alittle curious to see what other people have thought of them through experiance? Really good or average? regards Matt

Author:	drmini in aust [ Wed Feb 04, 2009 6:28 pm ]
Post subject:
I have built a few 1275 motors with Hepolites. 21251 (8.8:1) are cheap but not very strong, they are OK for a stocko rebuild (non-S). 21253 (9.75:1) are a better, stronger piston, similar to a Hypatec but more expensive. I recommend get Hypatecs instead if you are buying new, they are heaps cheaper. Can also get these in 73.0mm and 73.5mm. If you are going racing or building a big HP weekend warrior, check out Russell Engineering's pistons.

Author:	leema [ Wed Feb 04, 2009 6:32 pm ]
Post subject:
they are 20747's the also have stamped 413 and AE if that says anything they were out of my dads old engine which was built for a racing purpose. it did about 2 hours of running time

Author:	BALLISTIC [ Wed Feb 04, 2009 6:46 pm ]
Post subject:
As the good Doc has said.....Go the Hypatecs or get a set of GR pistons if going over +60thou best you speak to the man first as to your requirements.

Author:	sitnlo62 [ Wed Feb 04, 2009 6:48 pm ]
Post subject:
The main problem with Hepolite pistons as I see it is that you are limited in the type of piston rings you can use, As far as I know only Hepolite rings fit the piston. They are not Chrome or Molly top rings and the ring gap is way to large straight out of the packet. If you chose to use Hypertec pistons you have a far greater choice of quality piston rings from different manufacturers, eg Grant or Hastings.These companys offer a choice of a cast, chrome or molly top ring which can be gaped to the correct size before fitting. Dave

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Hepolite Pistons https://www.ausmini.com/forums/viewtopic.php?f=2&t=49954	Page 1 of 1

Author:	leema [ Wed Feb 04, 2009 7:13 pm ]
Post subject:
David Vazard says that 20747 is a forged piston with a 9.7CR 6cc Dish Excellent High Performance Race Piston Will take Hastings Rings

Author:	drmini in aust [ Wed Feb 04, 2009 7:17 pm ]
Post subject:
sitnlo62 wrote: The main problem with Hepolite pistons as I see it is that you are limited in the type of piston rings you can use, As far as I know only Hepolite rings fit the piston. They are not Chrome or Molly top rings and the ring gap is way to large straight out of the packet. If you chose to use Hypertec pistons you have a far greater choice of quality piston rings from different manufacturers, eg Grant or Hastings.These companys offer a choice of a cast, chrome or molly top ring which can be gaped to the correct size before fitting. Dave Nippon rings fit the Hypatecs too, I run them in my 1412 stroker. GR uses these in his own brand pistons.

Author:	Karcraft [ Wed Feb 04, 2009 7:26 pm ]
Post subject:
20747 is "Econoguide Powermax" piston. Hepolite were the only piston manufacturer in the world to make this style of piston. On the thrust skirt of the piston there were 3 raided pads (less than.0005" high) that contacted the bore. These pads were formed when the piston was forged. This cut down friction. You could not see these pads when the piston was new - only after the engine had been run for a couple of hours. An extremely high quality piston. Hope this helps.

Author:	sitnlo62 [ Wed Feb 04, 2009 8:00 pm ]
Post subject:
There you go Leema, Looks like you have a trick set of pistons there drmini in aust wrote: [quote="][/quote] Nippon rings fit the Hypatecs too, I run them in my 1412 stroker. GR uses these in his own brand pistons.[/quote] Thanks for the tip on the Nippon Rings Kevin. It's always good to have another option Dave

Author:	leema [ Wed Feb 04, 2009 8:17 pm ]
Post subject:
sitnlo62 wrote: There you go Leema, Looks like you have a trick set of pistons there Trick set??

Author:	drmini in aust [ Wed Feb 04, 2009 8:19 pm ]
Post subject:
He means VF Good....

Author:	leema [ Wed Feb 04, 2009 10:43 pm ]
Post subject:
Karcraft wrote: 20747 is "Econoguide Powermax" piston. Hepolite were the only piston manufacturer in the world to make this style of piston. On the thrust skirt of the piston there were 3 raided pads (less than.0005" high) that contacted the bore. These pads were formed when the piston was forged. This cut down friction. You could not see these pads when the piston was new - only after the engine had been run for a couple of hours. An extremely high quality piston. Hope this helps. I think i have found those 3 pads you talked about

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