Author Topic: Eastern pistons  (Read 5622 times)

Offline terryk

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Re: Eastern pistons
« Reply #30 on: 01.09. 2011 04:27 »
Does anyone know how much weight difference there is between JP pistons and hepolite?
1950-53 A10 rigid/plungers, 1958-61 A10 super rockets, 1947-50 A7 longstrokes, 1949 Star twin,
1951-54 A7 plungers, 1940s M21, WDM20s,
1948-50s B33s rigid/plunger/swingarm, 1948-50s b31s rigid/plunger/swingarm

Offline KiwiGF

  • Last had an A10 in 1976, in 2011 it was time for my 2nd one. It was the project from HELL (but I learned a lot....)
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Re: Eastern pistons
« Reply #31 on: 01.09. 2011 07:53 »
I asked JP and they gave the weight of their A10 std bore pistons as 351grams for the 6.5:1  and 343grams for the 7.25:1

I have quite a collection of hepolites and non branded pistons and the hepolites are the heaviest and much heavier than the BOA pistons mentioned above (using balance on ruler on nail method)

I have no way of measuring the weight in grams of the hepolites though - sorry
New Zealand

1956 A10 Golden Flash (1st finished project)

1949 B31 rigid “400cc hot rod” (2nd finished project, + favourite bike)

1949 C11 rigid, but why!!! (cos it was cheap)

1937 B21, project missing parts, mission impossible?

GL1800 Goldwing, well, the wife likes it

KTM 950 ADV, cos it’s 100% nuts

1952 Armstrong Siddeley Whitley for rainy days (with wife

Offline KiwiGF

  • Last had an A10 in 1976, in 2011 it was time for my 2nd one. It was the project from HELL (but I learned a lot....)
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Re: Eastern pistons - JP weight v Hepolite
« Reply #32 on: 30.11. 2011 10:07 »
Hi Terry- firstly BOA refunded me for the duff piston sets I got from them and also refunded me all the freight involved so good on them!

After quite a few quotes including very high prices for NOS hepolites I bought JP pistons from Draganfly- odd it's cheaper to have them sent from aus to the uk and then back to nz! Draganfly had nil stock so I had to wait for them to do all the traveling.

Anyway using a metal ruler and nail as a balance I can tell you the JP pistons std bore flat tops part no 0652 are slightly lighter than the hepolite pistons listed below. Interestingly I found the difference about equal to the difference between a gudgeon pin with a straight bore as supplied by JP and some tapered bore pins I had.

I hope this info is of some use- I was surprised the Hepolites were heavier than JP as I've been told the Hepolites are direct equivalent to the OEM BSA pistons, and also I've been told that a general problem with JP's is that they are much heavier than almost any other brand, but that does not seem to be true in the case of A10 pistons

11062 +060
11412 +020
11787 +060
Chinese? std

New Zealand

1956 A10 Golden Flash (1st finished project)

1949 B31 rigid “400cc hot rod” (2nd finished project, + favourite bike)

1949 C11 rigid, but why!!! (cos it was cheap)

1937 B21, project missing parts, mission impossible?

GL1800 Goldwing, well, the wife likes it

KTM 950 ADV, cos it’s 100% nuts

1952 Armstrong Siddeley Whitley for rainy days (with wife

Offline BSA_54A10

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Re: Eastern pistons
« Reply #33 on: 01.12. 2011 13:15 »
Quote
Apart from comments JP pistons were heavy and the rings rubbish the final straw was that it was cheaper to buy JP pistons from UK distributors like "red lizard" than direct from JP and even when I pointed that out to JP they refused to budge on price. JP also wanted twice the $ to ship from Aus to NZ than UK suppliers charge to ship to NZ!

Australia Post is now just about the most expensive O/S postal system in the world so do not blame JP for that, Julia Gillard yes, JP no.
As for unbranded pistons I never even think of using them.
If a product is good then the maker will want to tell the world about it, if it garbage they won't.
If a supplier sells quality pistons then they will sell them in branded boxes so the world will know that they sell good quality pistons.
If neither want their name to be associated with the pistons it is most likely because they want you to forget where you got them from before they failed & totaled your engine
Bike Beesa
Trevor

Online chaterlea25

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Re: Eastern pistons
« Reply #34 on: 02.12. 2011 10:21 »
Hi All,
Just as an addendum to this thread the previously "no name " pistons are now "branded" Hepolite *eek* *eek* *eek*
and sold/distributed by Wassels,
HTH
John O R
1961 Super Rocket
1963 RGS (ongoing)

Offline a101960

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Re: Eastern pistons
« Reply #35 on: 02.12. 2011 16:30 »
Oh dear, oh dear. oh dear.