The "DL 50" gas engine - NOT an imitation of another engine, but a very good reed rear-induction engine that comes with 2 5/8" standoffs standard now (August, 2007). It also comes with an RC-EXCELL ignition, V.2.0, which works reliably and well on voltage up to a 2S Lithium Poly (7.4 v). I am running two of these now on my 2S A123 cells direct, no regulators, at 6.6v nominal, with no ill effects.
DL MOUNTING TEMPLATE - Courtesy "DL Australia Engines", offered here with their permission. (This is an Adobe document - for printing accuracy, be sure to turn Scaling OFF, or set to 100%, then measure after printing. Center to center dimensions are 80mm width, 68mm tall.)
DL Carb Info Pic 
GAS-OIL RATIO CHART (Printable)
After trying a number of different 50 - 60 cc gas engines, I finally realized that I shouldn't ignore something just because of it's price. Something's "total value" is always important to know, and for me with gas engines, it's performance, quality, and cost.
The DL 50, imported and distributed by "DL USA" is a 50.8 cc engine, model after some of the more widely-known rear-intake "purpose built" RC airplane engines.
Using a Walbro, WT-664A carb, on a well-designed 4-petal reed induction system, the engine is very easy to start, adjust, and run reliably.
The Instructions specify a different sort of break in, but on DL USA's "FAQ", an alternative, more traditional configuration is offered.
I have two engines, and have used each of the break in procedures, one on each. At this point, about 5 hours into them, I can tell NO differences. Power is very good, IMO, and the engine is turning a PT models 22 x 8 N (new, *not* "Narrow") CF prop from Troy Built Models at 7100 rpm on stock muffler, and 30:1 Pennzoil. Pretty stout.
The stock muffler is loud, but nothing like a Bennett or Abell non-muffler manifold, so it's okay. I've bought a J'Tec wrap around Pitts for # 2 engine, installed and ran, no rpm differences from stock. Much more mellow tone, and no effect on idle and transition. Great muffler value at J'Tec!!
The engine mount extrusions got some bad press with version one, and they may have been under-designed, but v.2 has been out now for hundreds of engines, and the mounts are easy to use, work with, and install. One of the things I like about this engine is the "bolt up and go" installation that is so easy.
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| Standoffs are *NOT* DL brand, borrowed for this installation from a different engine. | ||
