Piston identification

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Michael.Brown
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Piston identification

Postby Michael.Brown » Fri Dec 06, 2019 8:57 pm

Hi all,

Can anyone throw any light on what the numbers, letters mean on this 350cc Piston.

Its marked Heplex 11266 on the inside and +0.030 on the top which is domed
3323 AM
413
LS1 or could be L51

Ideas on compression ratio etc.

Thanks

Mike
1942 Ariel W/NG
1960 Ariel Arrow
1960 Ariel Leader
1963 LE Velocette MK3

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dave.owen
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Re: Piston identification

Postby dave.owen » Fri Dec 06, 2019 9:16 pm

Check out the drags website most piston numbers on there.

Dave
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Michael.Brown
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Re: Piston identification

Postby Michael.Brown » Fri Dec 06, 2019 9:37 pm

I did Dave but not listed.

Mike
1942 Ariel W/NG
1960 Ariel Arrow
1960 Ariel Leader
1963 LE Velocette MK3

Simon.Gardiner
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Re: Piston identification

Postby Simon.Gardiner » Sat Dec 07, 2019 1:30 am

I assume it looks like this one - with 3 compression rings?
11266.jpg

https://www.ebay.co.uk/itm/ARIEL-350CC- ... SwhYRdmDJY

SG
'55 Huntmaster, '56 VH, ' 51 VH, '80 R100RT, '00 Sprint ST (but all those Ariel parts can only make one running bike...)

nevhunter
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Re: Piston identification

Postby nevhunter » Sat Dec 07, 2019 4:25 am

The Hepolite piston has a T slot and is probably for the mid 50s touring application and would have a compression ring. I wouldn't use it in a "Fast" motor but they run with a bit less clearance than the W/NG or pre 49 pistons which has 3 comp rings. If you widen the groove to take an oil ring it does weaken the skirt as the pattern doesn't allow extra metal for the bigger groove. Nev

Michael.Brown
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Re: Piston identification

Postby Michael.Brown » Sat Dec 07, 2019 9:18 pm

I'll post some pictures tomorrow in case that helps identify it.

Mike
1942 Ariel W/NG
1960 Ariel Arrow
1960 Ariel Leader
1963 LE Velocette MK3

Michael.Brown
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Holder of a Nylon Anorak
Posts: 117
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Re: Piston identification

Postby Michael.Brown » Sun Dec 08, 2019 1:40 pm

As promised here are the pictures of the piston which has two compression rings and an oil control ring. Particularly interested in the likely compression ratio!

Mike
Attachments
20191208_125051_compress17.jpg
20191208_124932_compress18.jpg
20191208_124841_compress74.jpg
20191208_124918_compress42.jpg
1942 Ariel W/NG
1960 Ariel Arrow
1960 Ariel Leader
1963 LE Velocette MK3

Simon.Gardiner
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Re: Piston identification

Postby Simon.Gardiner » Sun Dec 08, 2019 2:48 pm

Looks very familiar....and I've just found that I've got one too!
Putting my 11266 alongside an 11210 they look identical - neither is slotted, can't think why they've got different numbers.
It'll be standard compression ratio, 6.2:1 if I remember rightly.

SG
'55 Huntmaster, '56 VH, ' 51 VH, '80 R100RT, '00 Sprint ST (but all those Ariel parts can only make one running bike...)

Michael.Brown
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Re: Piston identification

Postby Michael.Brown » Sun Dec 08, 2019 6:50 pm

Many thanks Simon,

I was beginning to think I had a rogue/unknown piston, so good to know there are others, and they are the same as the 11210 which is listed on the Drags website. I have got it as a spare for my W/NG.

Mike
1942 Ariel W/NG
1960 Ariel Arrow
1960 Ariel Leader
1963 LE Velocette MK3


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