Tom Senior Simplex 1/10hp

Discussion in 'Discussion' started by Skankin_giant, Jul 30, 2019.

  1. Skankin_giant

    Skankin_giant Well-Known Member

    Picked up this little Tom Senior Simplex today (well, received it in the post, free delivery as well!) It seems to be a Size 2 fitted with a gas carb.

    Bad bits so far, the crank is bent on the pushrod side which I'm going to take to an engineer to straighten. I'm also not too happy with the way the flywheels are secured, machine screws into a drill mark in the crank isn't confidence-inspiring....

    I'm completely out of my comfort zone with this one..... but for a £160.99 eBay purchase, I'd be quite happy for it to be a paperweight.... I did pick up a small Amal carb are the weekend as I wasn't sure what gas bits were there, and the only experience I have of gas is a small scale engine my grandfather had which was a bit of a pain.
    Not sure which ignition route to take atm, the small model engine CDI systems seem like they might work and can be put in a small form factor.
    Apart from that, it seems ok, it's making all the right noises.

    [​IMG]IMG_20190730_174631 by Stephen Williams, on Flickr

    [​IMG]IMG_20190730_174734 by Stephen Williams, on Flickr

    [​IMG]IMG_20190730_175230 by Stephen Williams, on Flickr

    [​IMG]IMG_20190730_175321 by Stephen Williams, on Flickr

    [​IMG]IMG_20190730_175336 by Stephen Williams, on Flickr

    Cheers, Steve
  2. hourlapa

    hourlapa Administrator Staff Member

    Cute :)
    Skankin_giant likes this.
  3. highrange

    highrange Member

    "Picked up this little Tom Senior Simplex today (well, received it in the post, free delivery as well!)"
    You must have a big letter-box, Steve!
  4. Skankin_giant

    Skankin_giant Well-Known Member

    Don't have one at all.... but we have got a roller door.
    highrange likes this.
  5. raytech

    raytech New Member

    nice little engine there
  6. Skankin_giant

    Skankin_giant Well-Known Member


    Got a few options to try out for fueling this. Picked up a little Amal carb at the weekend for £4.80, I think the nice brass lever was worth the price on its own.... ideally I'd like to use the gas "carb" so bought an old-style regulator to convert to a demand valve, but I might try a petrol vapour carburettor (Jam Jar with a couple of pipes) first as they are simple to make and seem to work quite well.
    It's got a set of points which are break to spark so just a case of making sure they are cleaned up and working as they should.
    Might need to swap the flywheel around, it only makes the right noises turned what I'd usually call the wrong way (towards the cylinder head).

    Just a case of finding a small enough cooling tank etc. I should see an engineer in the next few weeks to get an idea of the crank situation.

    Cheers Steve
  7. Skankin_giant

    Skankin_giant Well-Known Member

    Tired to make one of the relay buzz coils and please to say it works... a bit of a dodgy set up to give it a go but I didn't die...... that flywheel is just a bit out...


    Cheers, Steve
    highrange likes this.
  8. Numpty1

    Numpty1 Member

    Well Done Steve! Reckon gas is the way to go with these tiddlers. You would need a very small carb to tame it, plus the mess. Just need that crank sorting.
  9. Skankin_giant

    Skankin_giant Well-Known Member

    Thanks Mark,

    I've got a Gas Vapour (Jam Jar carb) pretty much made up now, only cost me the price of a 250ml Kilner jar.
    I'm going to give that ago before mounting it down on something more permanent, hopefully going to see a man about the crank this weekend.

    Cheers, Steve
  10. Skankin_giant

    Skankin_giant Well-Known Member

  11. Skankin_giant

    Skankin_giant Well-Known Member

  12. Skankin_giant

    Skankin_giant Well-Known Member

    Crank straightened, "buzz coil" & demand valve made, rough test run done! Still need to bolt it down..... It took a lot of fiddling to get it going but it's going.

    Cheers, Steve
  13. petternut

    petternut Administrator

    Well done Steve. Looks and sounds well.
  14. Skankin_giant

    Skankin_giant Well-Known Member

    Thanks Roland,
    It's had a bit better run today. There is a bit of side to side movement in the crank which is what I think the knock is, or it could be the ignition stem springing closed on the follower. There isn't much more I can do for it really.

    highrange likes this.
  15. petternut

    petternut Administrator

    :) It looks to bolted to a pretty little fireside box?
    Any ideas what 1/10hp was used for?
  16. Skankin_giant

    Skankin_giant Well-Known Member

    Yea, pulled a coal scuttle out of a skip, thought it would be better than anything I could make.... and hides the coil, relay and battery quite well.
    Not a clue really Roland, they were advertised as "working" engines for the likes of lathes and small dynamos for a hand full of lights in a work shop. I've got a small Stuart pump I'm going to connect it up to, though could do with another to replace the one from the Brockhouse.
  17. Skankin_giant

    Skankin_giant Well-Known Member

    Had another go with the Tom Senior, I've run out of propane so am now on camping butane, not sure if it will make much difference. Coiling tank is the next job, just waiting on a few clamps to be delivered.

    Is it sad that I would still prefer a WW1 Douglas or Bosch Benzine set......
    Last edited: Apr 5, 2020
  18. robtheplumb

    robtheplumb Member

    Not really sad Steve, we all have a preference, nice little thing to be fair but for me it would be a little like owning a Mar-Vil, soon get bored with it as it's just too small!
  19. Skankin_giant

    Skankin_giant Well-Known Member

    Wouldn't say I'm bored with it but just really not my thing, when it's running I can say I enjoy it that much.

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