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Details about  Enya 15D Mk 1 & Enya 15D Mk2 - For once really rare!

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Enya 15D Mk 1 & Enya 15D Mk2 - For once really rare!
Enya-15D-Mk-1-Enya-15D-Mk2-For-once-really-rare
Item Ended
Item condition:
Used

cosmetic blemishes consistent with normal use

Ended:
31 Oct, 2013 18:09:55 GMT
Winning bid:
£112.00
19 bids ]
Postage:
£9.00 Express Delivery | See details
Item location:
East Cowes, Isle of Wight, United Kingdom

Description

eBay item number:
200978980118
Seller assumes all responsibility for this listing.

Item specifics

Condition: Used : Split the cost with friends
An item that has been previously used. The item may have some signs of cosmetic wear, but is fully operational and functions as intended. This item may be a floor model or an item that has been returned to the seller after a period of use. See the seller’s listing for full details and description of any imperfections. See all condition definitions- opens in a new window or tab
Seller notes: cosmetic blemishes consistent with normal use
Brand: Enya MPN: 15 D Mk1 & 15D Mk2

For once a really rare pair of Diesels - the Enya 15D Mk1 & Mk2.....the Mk1 has seen some running but still feels good.....it is a later model having the 6mm dia high spec crankshaft..the Mk2 appears to have had little running and feels 'tight'....with application of thin oil it frees up and the tightness is probably gummed castor..it could do with a run..this is a rare opportunity to bid for a real collectors pair of diesels with no reserve....so have fun.....to whet your appetite here is some more info by Enya expert Bob Allan

 

 

 In 1956 ( along with 3 other new models in the range ) Saburo Enya introduced his first ever diesel ® the 15D Mk. I , distinguished by its vertical venturi joined to the front of the cylinder.

The 15D was a very ambitious project, being the first Enya to employ ( single rear ) ball races and, refusing to follow nearly all the other diesel designs of the day, the designer had opted for the unusual choice of loop scavenging, which meant opposed transfer and exhaust ports coupled with fore and aft transfer passages ( actually, it was a single passage in the casting but divided in 2 by the contact of liner against casting ). Although some people thought erroneously this was Schnuerle porting, it was even so, quite innovative for the time, and endowed the 15D with a performance which was second only to the Oliver Tiger Mk. III. Not bad for a first attempt ! Indicative of just how different this diesel was to its glow stablemate, was the fact that the only common part shared was the needle valve assembly, and in the 15D provision was made to fit 2 NVA's ( one high / one low speed ) for use with those early steam powered radio control systems. There were actually about 3 variants of the Mk. I and therein lies a tale ® Peter Chinn confessed at a later date that when he was testing the 15D for an American model publication, he had struggled to find something to complain about, on the theory that no engine is so good that it is beyond criticism. In Peter's words ® 'eventually, but without much conviction, we decided that the 5mm. threaded shaft end was a possible weak point on an otherwise robust engine....When the Enya company heard about this, they took it seriously.....Within a few weeks a new type of shaft, in 85 ton chromium molybdenum steel and with a 6mm. end had been put into production. This shaft has been fitted to all production models since the end of last year ( 1957 ) and the current model now incorporates one or two other minor changes. These include a superior type of ball bearing, a con-rod bronze bushed at both ends ( instead of the big-end only ) and slightly enlarged gudgeon-pin bosses in the piston.' How ironic then, that the 15D is remembered today mainly for breaking crankshafts ! Taking the above information into consideration, we can now only assume that these shaft failures were the result of either competition modellers simply trying to extract too much extra power and / or ( as a noted US speed flyer commented to me when discussing similar shaft failures on his Enya 29 racing Special ) ' too many square corners ', meaning the shaft was lacking fillets in high stress areas. Whatever the problem was, Duke Fox faced exactly the same thing a few years later when combat flyers started complaining about breakages in his otherwise excellent 35 X engine. Peter Chinn stated frankly that despite a couple of material changes, the Mk. I 15D was never entirely free of shaft fracture through the main journal, and proffered the opinion that the fault ( conversely to what one might think ) may have been due to the very rigidity of the piston & rod assembly, transmitting too much stress to the journal.

Aware of this problem, Saburo Enya was determined to eliminate it in the 15D Mk. II and it appeared in about 1960 sporting an enormous 11.5 mm. diam. crankshaft and a chrome plated bore which was another bold innovation for that period of time. Power was increased to around 0.332 bhp @ 15,500 rpm which really gave the Oliver Tigers a fright, but unfortunately the overkill solution to the shaft problems meant the weight had now ballooned to over 6 oz. ( remember, the very powerful 29-III weighed only something like half an oz. heavier ! ) so despite the fact that the Enya was very easy to handle for a world class racing diesel, the Tiger III continued to reign supreme. The fact that the Enya used more fuel ( and needed an exhaust prime to re ® start ) was the final nail in the coffin of Saburo's attempts to beat the Oliver's at their own game, the ultimate irony being of course, that the very advanced type of porting which gave the Enya parity with the Oliver in 'A' T/R became, in the finish, its Archilles heel. Keep in mind though, that the Enya was very much a mass produced engine trying to compete with a meticulously hand made ( and tuned ) one of unsurpassed quality. The Enya 15D Mk. II was, nonetheless, a great sport engine being also available with a simple R/C throttle and it remained the last diesel produced by the company for 40 years ( excluding of course, the little 06 ) until in 2004, Enya released a new 15 diesel based on the Schnuerle ported SS and featuring modern ABC technology with alloy piston.

 

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