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Lister cast piston

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HobbyNut31/08/2013 00:35:09
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113 forum posts
93 photos

I was sent a casting for a Lister piston by Ennech. He also emailed me the machining details.

I set it in the lathe and made the internal bore to size, so that I could set it on a mandrel.

inside mach.jpg

I then took a piece of Alum bar and machined a mandrel

piston mandrel.jpg

HobbyNut31/08/2013 00:37:23
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113 forum posts
93 photos

The piston was then locktited onto the mandrel

piston on mandrel.jpg

Then a cut was taken, and machined down to 28mm dia.

first cut on piston.jpg

semi finished piston.jpg

HobbyNut31/08/2013 00:38:59
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113 forum posts
93 photos

The ring grooves were then machined, and the OD polished with some 240 W&D.

cast piston.jpg

HobbyNut31/08/2013 00:44:03
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113 forum posts
93 photos

Unfortunately this did not end well. When I heated the skirt with my pencil torch to break it free, the piston and skirt parted ways at the lower ring groove. On inspection, I had gone 1 mm too deep on the id from the base of the piston, making that area too thin.

The casting was not at fault, I was, and the piston was a joy to machine, with only a few very small pinhole air pockets in the casting.

Oh well, I tried.

HobbyNut31/08/2013 01:49:02
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113 forum posts
93 photos

The final pics.

piston looks good.jpg

piston oops.jpg

MichaelR31/08/2013 08:48:42
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342 forum posts
57 photos

After all that good work on the piston, why not have the only Lister fitted with a Slipper Piston.wink

Stick.

Ian S C31/08/2013 13:36:02
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7447 forum posts
230 photos

Been there, done that, with the labyrinth grooves on a hot air engine piston, made the grooves .020" deep, instead of .010", I make the skirts of my pistons usually no thicker than .040", and if possible a little thinner. Just part of the job! Ian S C

HobbyNut31/08/2013 16:00:19
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113 forum posts
93 photos

I am sure that the piston would work still being shorter and all. it is still long enough that it wont turn over in the bore, the only thing missing is the oil ring. I am going to try it "one of these days".

I have seen plenty of Ford and Chevy V8 racing pistons that are very short for the bore size.

Stub Mandrel31/08/2013 16:47:49
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4306 forum posts
291 photos

You must be a biker! - Piston broke!

Neil

HobbyNut31/08/2013 21:18:52
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113 forum posts
93 photos
Posted by Stub Mandrel on 31/08/2013 16:47:49:

You must be a biker! - Piston broke!

Neil

Thats true....I am all of that!!!

Stub Mandrel01/09/2013 11:25:41
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4306 forum posts
291 photos

Bear in mind the phrase may have a somewhat different meaning in your side of the Atlantic - p****d means drunk, not angry, in the UK!

Neil

Gordon Wass01/09/2013 11:34:29
57 forum posts

If it helps I've run a real full size lister with a piston like that, a bit of slap and a bit of oil burning but otherwise ok.

HobbyNut01/09/2013 16:02:18
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113 forum posts
93 photos

Neil, I am an Aussie....nerd

Gordon, I have the Lister all apart at the moment, and I intend to fit that piston, just to see what happens.

Stub Mandrel01/09/2013 18:09:58
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4306 forum posts
291 photos

> Neil, I am an Aussie....nerd

Well that explains anything!

Neil

HobbyNut03/09/2013 02:11:09
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113 forum posts
93 photos

That piston is in the engine. It seems like it is working OK, there is lots of compression now. Still wont run sad

Ennech07/09/2013 11:46:19
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152 forum posts
135 photos

If there is more compression you may have to increase the injector pressure as this must always be greater than the cylinder pressure at injection point.

HobbyNut09/09/2013 07:09:30
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113 forum posts
93 photos

Well, I am in the process of building a new head from steel, and a new injector, ala DUX. It does not have a moveable plunger. The pump needs a seal, and I will build a new piston for it also. I will then hook everything up, before fitting the head to check if/what the spray pattern looks like.

JasonB09/09/2013 07:42:27
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Moderator
16415 forum posts
1736 photos
1 articles

How are you seeing what the spray pattern is like as you need to see whats comming out at the pressure inside the combustion chamber. Pumping into open air will not show how the injector works inside the engine.

J

Ennech09/09/2013 11:08:13
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152 forum posts
135 photos

Picture from Gardner LW Instruction Manual (don't do this at home)

injector spray.jpg

JasonB09/09/2013 11:12:07
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Moderator
16415 forum posts
1736 photos
1 articles

That really only shows that there is no blockage in the lines.

Without testing the injector under pressure you won't know if the pump is producing more pressure than the engine compression or what the spray pattern is like.

J

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