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81
Douglas Motorcycles - General Discussion / Re: Pistons
« Last post by Dads bike on 11 Jan 2022 at 21:07  »
Last two
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Douglas Motorcycles - General Discussion / Re: Pistons
« Last post by Dads bike on 11 Jan 2022 at 21:06  »
Evening
Hopefully have attached Douglas info from 1939 Hepolite brochure
Steve
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Douglas Motorcycles - General Discussion / Re: Pistons
« Last post by Dads bike on 11 Jan 2022 at 18:33  »
Evening

The only ref no for the 1934/36 250cc sv is 5322. a 51mm aluminium piston with three rings (two compression and one scraper) and the machine descriptions are for the Comet, Y, 5Y
See if I can cross ref your nos with anything else?

Steve
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Douglas Motorcycles - General Discussion / Re: Pistons
« Last post by Tazmantic on 11 Jan 2022 at 17:39  »
Afternoon Roy
I may be able to offer some help regarding the numbers that you listed
The Hepolite info that I am looking at is thier 1939 catalogue.
The highest piston ref number is in the 8000s therefore I guess the 9747 and 9749 may we'll be post war?

Ref 4870 is for the 1932 K32 350cc OHV machine. It is an aluminium piston (not heplex) of 60.8mm dia with three rings and has a flat head.

Ref 1600 Is for the 1926/9 350sv models B28, B29, EW and is the aluminium piston type (not heplex) of 60.8mm with two rings and a domed head. (NOTE 1602 is the cast iron type if you should have them)



Ref 5788 is a bit of an enigma! It is listed for the 1935 750cc OHV special?? Again this is an aluminium
(Not heplex) piston it is 76mm dia with one ring and a flat head. I don't know the machine that this is for.

I do have some other info for later machines but currently cannot find it.
Let me know if I can be of further help.

Steve

Hi Steve,

I have a piston that I believe is a aero 250 there are 2 numbers one I can read 2102 the other I cant as the inside of the skirt has been machined slightly but I think its 8875. Do these match anything in your book?

Cheers
85
Douglas Motorcycles - General Discussion / Re: Pistons
« Last post by Tazmantic on 11 Jan 2022 at 17:16  »
Hi I've just bought a 1930 to 1958 list so this might give some info when it arrives
86
Douglas Motorcycles - General Discussion / Re: Pistons
« Last post by Red on 11 Jan 2022 at 16:12  »
Thanks Steve that is very helpful.

We seem to have 2 x 4870 Std pistons and 2 x 1600 Std pistons. Anyway I have got a long way to go in sorting what we've got but all information I can get will make it a bit easier. Thanks again

Roy
87
I can add now:
the fork bridge is damaged, so the forkstem and the fork members do not fit! (see photo I put a bridge from my MK5 under the damaged one)
Has someone a precise drawing with measures of the holes or a spare bridge (late type MK4 / 5) or an other idea?

The top cup is also too small in dia (43,7mm). Is this right or is the head lug worn out?

I hope someone can help.

Michael
88
Douglas Motorcycles - General Discussion / Re: Pistons
« Last post by Dads bike on 11 Jan 2022 at 14:34  »
Afternoon Roy
I may be able to offer some help regarding the numbers that you listed
The Hepolite info that I am looking at is thier 1939 catalogue.
The highest piston ref number is in the 8000s therefore I guess the 9747 and 9749 may we'll be post war?

Ref 4870 is for the 1932 K32 350cc OHV machine. It is an aluminium piston (not heplex) of 60.8mm dia with three rings and has a flat head.

Ref 1600 Is for the 1926/9 350sv models B28, B29, EW and is the aluminium piston type (not heplex) of 60.8mm with two rings and a domed head. (NOTE 1602 is the cast iron type if you should have them)

Ref 5788 is a bit of an enigma! It is listed for the 1935 750cc OHV special?? Again this is an aluminium
(Not heplex) piston it is 76mm dia with one compression ring one scraper ring and one oil ring that is below the pin and a flat head. I don't know the machine that this is for.

I do have some other info for later machines but currently cannot find it.
Let me know if I can be of further help.

Steve


89
Shannon’s Aus Summer Online Auction....1920 SW unrestored just listed

Link added - Dave, 11Jan2022
90
My 34 machine is a Model Z which as far as I can make out was a bit of a mongrel, segmented cork clutch but with a petrol tank housing the oil tank, a mixture of old and new. The owners club refer to the early model Z as a prototype for the later Wessex model though I have no collaboration of that and if it is the case I suppose it's possible that the handle bars destined for the the 35 and onwards models were trialled on the Zs first I suppose.

Chris
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