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brokenenglish

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    Engine projects

    in IC Engines

    Posted

    Following my earlier post, a bit of Web browsing confirmed that the castings source I mentioned in Oundle was called "Woking Precision Models", and that their range was taken over by Hemingway around 2006.

    Engine projects

    in IC Engines

    Posted · Edited by brokenenglish

    Here's the "other side" of my engine. Note the adapter, under the glow plug. I don't think the castings can be "Hemmingway" (whassat?), as this engine has been in my possession for more than 40 years.

    Your build threads have motivated me to run the Atom on sparks ASAP. I'm looking forward to it, but the weather is b-awful.

    I would expect the Atom to perform a bit better on sparks than on glow, but that's of no importance for me. "Nice running" is far more important than minor performance differences.

    I seem to remember that, decades ago, castings sets were marketed by a model engineering firm in Oundle, maybe my engine is from those.

    Atom minor miracle_2.JPG

    Engine ID required

    in IC Engines

    Posted

    43 minutes ago, John Tee said:

    Brokenenglish. There is nothing on the crankcase except "made in england" on the rear of the crankcase and the serial number on the left side below the exhuast.

    There are two examples on EBay and neither has anything on the crankcase. One has the serial number on the right side while the other has it on the left side as mine does.  This is why I quried if anyone knew the engine as there was no maker ID.

     

    John

    OK Here are the photos showing the engine id. Looking from the front, you can see E & D on the left and right, and Mk III below the shaft.
    Again, yours should be like this (it may be Mk II). 

    20240415_220312.jpg

    20240415_220358.jpg

    • Like 1

    Engine ID required

    in IC Engines

    Posted

    6 minutes ago, John Tee said:

    Brokenenglish. There is nothing on the crankcase except "made in england" on the rear of the crankcase and the serial number on the left side below the exhuast.

    There are two examples on EBay and neither has anything on the crankcase. One has the serial number on the right side while the other has it on the left side as mine does.  This is why I quried if anyone knew the engine as there was no maker ID.

     

    John

    Again, I think there's misunderstanding. Re-read my post. The front bearing is the casting bolted onto the front of the crankcase. If you look between the bolt heads, on the front of the engine, you should see an "E" and a "D", in the top part of the casting (above the shaft), and "Mk II" or "Mk III" below the shaft.

    Are those markings not there? I'll attach a photo within the next few minutes (I hope!).

    Engine ID required

    in IC Engines

    Posted

    On 14/04/2024 at 12:55, John Tee said:

    It is just typical, just like buses. I asked for info on my unmarked engine which was very quickly ID'd. Just looked on Ebay for spares as suggested and there are two for sale. I should have looked earlier.

     

    John

    I've just noticed that you think your engine is "unmarked" (apart from the s/n).

    Surely it should be marked "ED" and "Mk II" or "Mk III" on the front bearing.

    Engine ID required

    in IC Engines

    Posted

    Sorry John, there's a misunderstanding.

    Your engine should have the dish-shaped prop driver like my photo. This driver has a square hole that locates on the crankshaft.

    On your engine, the prop driver has been lost and replaced by odd washers with square holes cut to match the shaft. Those washers aren't original!

    All Comp Specials have a dish-shaped prop driver with a square hole, no exceptions. And all prop washers, that go on the front of the propeller (only one per engine!) have normal round holes.

    Like I said, your engine's original prop driver and washer have been lost and replaced by several odd washers with square holes. In fact, I think the reason you have several washers is simply to cover the square length on the shaft. No Comp Special ever had a front end like that. 

    • Like 1

    Engine ID required

    in IC Engines

    Posted

    Your engine is from September 1948.

    Apart from the points already mentioned, the bits around the prop driver are not at all the way they should be.
    Here's one that's the same vintage as yours. Your engine should look like this. You can see the various differences for yourself.

    It's quite likely that your engine may run well. In good condition, they're super engines.

    ED 022.JPG

    Engine projects

    in IC Engines

    Posted

    Jeff, I thought your propeller choice seemed a bit big, so I checked the original article. Laurie Sparey obtained best results with a 13x6, but his 13x6 must have been wood, i.e. far lighter than your MA & APC stuff (and easier on the fingers!).

    I'm lucky to have a huge collection of old propellers, and I would never use a modern composite prop on an old engine. Wood is best, or old soft plastic in the smaller sizes.

    Maybe a little more ether and a little less compression would be a good idea.

    Old diesels

    in IC Engines

    Posted

    Yes, you're right about the serial number. I forgot about the "L" and I'd run out of fingers.
    The S/N couldn't be '57. By 1957 the serial numbers were on the side of the case and I think the lugs were no longer scalloped. I'm not sure of the exact year they stopped scalloping the lugs, but it was before 1957.

    • Haha 1

    Old diesels

    in IC Engines

    Posted

    There's no reason to think that it might have been "marine", the M prefix on the serial number is just the production month (December).

    Mike, this photo shows the way your engine should be. It's the first production configuration.

    ED Comp Special_1b.jpg

    • Like 1

    Old diesels

    in IC Engines

    Posted · Edited by brokenenglish

    5 hours ago, Engine Doctor said:

    Some ED mk2's certainly had sub piston induction (SPI) . I believe all the Comp Specials ,easily identified by thier scalloped engine bearershad SPI. Many of these early engines differed slightly as experiments were made dyring production run so it might not have SPI not noticable in your pic. A carb  might not slow it effectively if it has SPI  . Any "O" rings in the carb will swell  up and eventually disintegrate as they dont like diesel fue or petrol. If the carb works then you will need to replace any rings with Nitrile " O" rings.

    Le5 us know how it runs. The nice thing about those mk 2s and Comp specials was that they would start with a hard stare if they catch just  a whiff of diesel !

    I see your engine has a prefix "M" on the number . Possibly converted from a marine unit ?

    ED, just a bit of info.
    Not all Comp Specials have scalloped lugs. It was done to differentiate in relation to the Penny Slot (the Mk II). When ED stopped making the Penny Slot, they stopped scalloping Comp Special lugs, so "later" Comp Specials have normal straight lugs, probably around 50% of total production.
    The serial number on the OP engine is a normal Comp Special serial number (Dec. '47). So it's very early production (looks like the 64th Comp Special made).
    Finally, I tried an RC carb on a Comp Special, around 40 years ago and IIRC, it wasn't very successful. 

    • Like 2

    Old diesels

    in IC Engines

    Posted

    1 hour ago, Mike T said:

    @Tim HooperWhat RC carb did you fit to your ED Mk II (or is it a Comp Special?), please?  And what mods were required to get it to fit on the intake spigot?

    (I bought one 2nd hand at the Nats in Hullavington back in '75.  It would be nice to see it in the air!)

    You don't need an RC carb to fly a nice old FF model. If you arrange the tank to give 3 or 4 minutes of engine run (in the air), you'll get between 5 and 10 minutes of glide and such flights are very enjoyable.

     

    • Like 1
    • Thanks 1

    Engine projects

    in IC Engines

    Posted

    Hi Tim, You were a bit unlucky with the O&R 23 that you "happened to find".

    They were made from 1938 until 1952, and only the 1947 model (which you have) was lugless (radial mount only).

    However, there was a beam/radial mount adapter available, for beam mounting, and there was also a tank mount accessory (see photo).

    I have a lot of Ohlssons and O&Rs and I like them a lot. Shame you found the only model with inconvenient mounting. 

    Ohlsson 016.JPG

    • Thanks 1

    Laser 50 Plane Olde Bargain.

    in IC Engines

    Posted

    David you've got your engines mixed up.

    I have a 45 and a 62, and the front bearing housings are parallel profile, not tapered like the one in your picture, i.e. as shown in John Rickett's photo above.

    Your engine is bigger and/or later than you think.

    Lasers at retail

    in IC Engines

    Posted

    I think most cars are slightly cheaper purchased in countries other than their country of manufacture.

    The manufacturers consider that they have a "captive market" in their own country (i.e. people who will only buy a car from their own country).

    Conversely, they make a slight "pricing effort" for other countries, to gain export revenue.

    In France, there are flourishing businesses who import new cars from abroad (say importing Peugeot from Denmark or Germany), and then sell them to French customers at a price somewhere between the domestic price and the export price. You can save a bit if you don't mind the hassle.

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