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Feb 03, 2013, 06:01 AM
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Must be a million model engineer guys in the USA that would make one for you if you have one to copy surely . Geoff.
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Feb 03, 2013, 01:29 PM
Newbee

What's This Please?


Hi All
Can anyone please confirm what this engine is on E-Bay.
Thanks BB
http://www.ebay.com/itm/148A-Taplin-...item257a7ee33a
Feb 03, 2013, 02:55 PM
Registered User
Thanks for posting.
marine diesel looks interesting with the large fly wheel and water jacket.
Last edited by JohnAV8R; Feb 03, 2013 at 04:01 PM. Reason: not Taplin
Feb 03, 2013, 02:58 PM
Sticks, Tissue & old Diesels
brokenenglish's Avatar
Quote:
Originally Posted by kakariki
Hi All
Can anyone please confirm what this engine is on E-Bay.
Thanks BB
http://www.ebay.com/itm/148A-Taplin-...item257a7ee33a
Yes, without any doubt, it's a watercooled ED Comp Special, 2 cc.
Feb 04, 2013, 03:32 AM
Newbee

re Taplin


Thanks for that info.
BB
Feb 05, 2013, 10:32 PM
Registered User

PAW "80", a 0.8 cc diesel


The PAW .8 cc, is a small diesel, especially when compared to a 10 cc diesel. Again thanks to Bill. I haven't had a chance to run this one, but it appears to be well made, "tough", and has lots of compression.
Best of all, they are still available.
John
Feb 06, 2013, 02:57 PM
Two left thumbs
Quote:
Originally Posted by JackHiner
I have an Enya .41 four stroke diesel. Just wish the four stroke had a compression adjustment. Jack
Aside from using a sleeve valve like a full scale Bristol Hercules, how are you going to vary combustion chamber volume?
Feb 06, 2013, 03:21 PM
Sticks, Tissue & old Diesels
brokenenglish's Avatar
Quote:
Originally Posted by GeoffinIN
Aside from using a sleeve valve like a full scale Bristol Hercules, how are you going to vary combustion chamber volume?
Geoff and Jack, we've been through all this before. The Enya has a dummy plug (screwed into the glowplug hole) that allows slight compression adjustment (by adding or removing washers I suppose), but not while running of course.
Apparently this is sufficient and they are said to run well. In fact, they run as a "fixed compression diesel", but ultra-rugged construction allows very high compression, so that "normal" (variable compression) fuels can be used, and running is less affected by ambient air temperature (than in the case of a fixed compression diesel).
A thing called a "diesel gadget" was also marketed some time ago, to allow other glow engines to run using the same principle (a dummy plug that can slightly vary compression).
Geoff, the Laser .75 fourstroke diesel does actually have a small contra-piston. The two valves leave sufficient surface area in the combustion chamber to accomodate an orifice in which a small contra piston can be operated by a normal compression screw.
Geoff, a little more than 50 years ago, I spent a year or two being dragged around the world by a couple of Bristol Hercules, and later even by four Centaurus.
Brian
Feb 08, 2013, 08:25 AM
Registered User

Avro triplane and Cox 049 diesel


This posting from Steve (mlbco) is worth a look: it uses a small Cox 049 diesel, and it provides a video of a scale model being flown with it. The sound of the little diesel really matches well with this triplane.

https://www.rcgroups.com/forums/show....php?t=1583373

RN Models Avro Triplane Mk IV

Thanks Steve.
Feb 08, 2013, 08:34 AM
Registered User
williame3590's Avatar
Quote:
Originally Posted by brokenenglish
Yes, without any doubt, it's a watercooled ED Comp Special, 2 cc.
Looks very much like it's cousin.....beautiful looking engines, one diesel, one on gas.

Bill
Feb 08, 2013, 11:37 AM
Registered User
Reginald's Avatar
Quote:
Originally Posted by brokenenglish
Geoff and Jack, we've been through all this before. The Enya has a dummy plug (screwed into the glowplug hole) that allows slight compression adjustment (by adding or removing washers I suppose), but not while running of course.
Apparently this is sufficient and they are said to run well. In fact, they run as a "fixed compression diesel", but ultra-rugged construction allows very high compression, so that "normal" (variable compression) fuels can be used, and running is less affected by ambient air temperature (than in the case of a fixed compression diesel).
A thing called a "diesel gadget" was also marketed some time ago, to allow other glow engines to run using the same principle (a dummy plug that can slightly vary compression).
Geoff, the Laser .75 fourstroke diesel does actually have a small contra-piston. The two valves leave sufficient surface area in the combustion chamber to accomodate an orifice in which a small contra piston can be operated by a normal compression screw.
Geoff, a little more than 50 years ago, I spent a year or two being dragged around the world by a couple of Bristol Hercules, and later even by four Centaurus.
Brian
Pictures of the engine the last one shows the dummy plug.
Feb 08, 2013, 07:39 PM
Two left thumbs
Sorry to have dragged up old stuff. Where is the rocker cover on the Enya? My only Enya 4 stroke is a glow .53, and it has a cover. Does the diesel have too much blow-by to allow a cover to be used?

Re the Cox in the Avro triplane: I note that it uses the double slit exhaust ports. No wonder it has no power!
Feb 08, 2013, 09:28 PM
Registered User
earlwb's Avatar
For some reason Enya leaves the rocker cover off. It is supposed to be in the box though. I don't remember reading anything in the instructions about why they didn't put the cover on either.

Now in place of the glow plug there is just enough room for a Lenova Energy Cell to be put in. But you may have to stop the engine to adjust it though, as it will be close to the prop.

Cox had to come out with the narrow double slit exhaust ports to arrest sparks so the engines don't set off fires. There were some government regulations about it in the later years.
Last edited by earlwb; Feb 08, 2013 at 09:29 PM. Reason: Add more information
Feb 09, 2013, 12:18 AM
Registered User
kkphantom's Avatar
Quote:
Originally Posted by brokenenglish
Yes, without any doubt, it's a watercooled ED Comp Special, 2 cc.
If its marked mkIII, it would be an E.D. MkIII. 2.49cc rather than a comp. special. but the intake is at the rear like a comp. special, go figure..
Last edited by kkphantom; Feb 09, 2013 at 12:24 AM. Reason: .....................
Feb 09, 2013, 03:09 AM
Sticks, Tissue & old Diesels
brokenenglish's Avatar
Quote:
Originally Posted by kkphantom
If its marked mkIII, it would be an E.D. MkIII. 2.49cc rather than a comp. special. but the intake is at the rear like a comp. special, go figure..
OK, one day I'll go through all the Mk IIs, Comp Specials and Mk IIIs on this thread.
First of all, many Comp Specials exist with the front housing marked "Mk II", there are also many with the housing marked "Mk III", and there are also a lot where the "Mk III" in the casting has been crudely modified to "Mk II", i.e. they filed off the last "I"!
Concerning the Mk III 2.49 side-port, the real problem is that it was never really a "production" engine. The few that were made have significant differences (particularly concerning the carb/tank/fuel cutout), and there just aren't enough of them around to be able to establish what should be "normal".
We can discuss this further if anyone is interested...
Now, concerning the engine on eBay, the definite giveaway is the serial number "WM 1978 C". The "C" indicates that it's a Comp Special. The "W" means that it actually left the factory as a boat engine (so it's probably entirely original - good!) and, as is well-known, "M 1978" means that it's the 197th engine made in December 48.
Finally, "just for a smile" and concerning the 2.49 side-port... Those of you who possess Mike Clanford's book could have a look at the 2.49 side-port... and have a look at the (visible) serial number. The S/N ends with a "C"! Thus, IMHO, the engine has a "genuine" top end, that's been assembled on a Comp Special crankcase...
As the French say... "Ce n'est pas une science exacte..."
Last edited by brokenenglish; Feb 09, 2013 at 03:20 AM.


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