Douglas SV

Hi Chaps,
Anyone know anything about Douglas SV's?
A while ago I acquired a SV45. It had been standing in someone's garden for
a millennium or so and probably qualifies for the award for the rustiest
piece of iron (and aluminium) I own. It hadn't been started for about 20
years but after un-sticking a valve, cleaning the points and carburettor, it
(or is it a she?) ran!
The wildlife extricating itself from the engine as it got a bit too warm for
them was something to behold! - particularly, one of biggest spiders I've
ever seen, it looked like a scaled-up - about 36" to the foot - black widow.
Don't tell the missus, it's still at large somewhere in the garage!
I only bought it because it came as a job-lot with a hefty generator I was
after, it's not after all, the prettiest engine in the world!
Anyway, the A-Z is about the only info. I can find on it. The A-Z says 'SV45
= 450cc serial numbers 3126 to 3334 built 19/9/51 to 9/11/55'. Well, my
one's serial no. is 565H. Did they make only 208 SV45's or did they make
3334 with mine being made perhaps just after the war?
I thought the SV's were only made from about '51 to '55 ish. Any clues?
Regards
Mark
Reply to
Mark Howard
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AFAIK they were only made post-war. Sadly the factory records were destroyed and the very knowledgeable Eric Brockway passed away a few years back. ttfn Roland
Reply to
Roland and Celia Craven
I think you will find the serial numbers quoted by Eric Brockway were all that Douglas had on record. A lot of the engines (ours included, a SV63) appear to carry a number on nameplate that is far different from those found in the A - Z. There may also be a number stamped on the crankcase. You may find that the serial number you have was a link to the equipment it powered rather than the engine itself. Ours was originally fitted to an Opperman Motocart and had been modified. They are a robust engine and as you found take only a little work to get them running. They can be a bit thirsty though, ours will get through a gallon a day on the rallyfield. You don't get many rallied, but if you do you will be amazed at how many people will tell you that they have one "somewhere at the back of the shed".
Regards
John R
Reply to
John Rogers
To add to my posting of last night our engine carries the Engine No 1590BP, Type SV63 on the makers plate. The numbers 63 and 1189 are stamped into the crankcase housing beneath the fuel tank.
I can't help with the number but the H may indicate that the engine is a 'High' model. You can confirm this by measuring the height from the base to the centre on the shaft. It should be 7.5" for the high model and 6.9" for the low model. Sump capacity also varies with 4 pints for the high model and 3 pints for the low.
I would agree with the going out of production around 1955 'ish but I have an original Operation and Maintenance Handbook which has an added engine service bulletin dated 10th October 1947, so production of the SV range may well date from immediately or just after the end of WWII. This would make sense as in article about Douglas engines for SE, Eric Brockway wrote that a larger (3 1/2 to 8 3/4 HP) range of air cooled single cylinder engines based on the 100cc engine design were produced for the Ministry of Supply during the war years.
Regards
JohnR
Reply to
John Rogers
Thanks John,
Very interesting. I'll look up the Douglas article in SEM when I get a chance.
Thanks again
Mark
Reply to
Mark Howard
Got a Douglas engine today F224951 Model 29374 WJ , the F22 etc. could also read E 224951? Thanking you in advance Rory Mullins
Reply to
Rory Mullins
Got a Douglas engine today F224951 Model 29374 WJ , the F22 etc. could also read E 224951? Thanking you in advance Rory Mullins
Reply to
Rory Mullins

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