ORIGINAL: downunder
ORIGINAL: Capflyboy05
Super Tigre 15 (Not mounted)
Enya 45 model 6001 (Mounted on Custom Built Trainer)
Enya 35 model 5224 (Not mounted)
Just to concentrate on these, the ST 15 may be either the old G20/15 or the later G15 but both most likely have a cast iron piston so I wouldn't use a fuel with less than 20% all castor. Neither of these engines are your normal run-of-the-mill sports engines and are rather collectable.
The Enya 45 is a fantastic engine but not as powerful as later engines because the 6001 model was originally intended for CL stunt. It came in two versions, the first had twin rings (like mine) then changed to a single ring in about '71. Don't use Morgan fuel (either Coolpower or Omega) in this because their fuels don't have enough oil content (only 17%). Personally I used 25% all castor in mine.
The Enya 35 has a cast iron piston and really needs 25% castor. With this type and amount of oil these engines are legendary for their life span. It's rumoured that someone managed to wear one out but no one actually believes it
.
There is a huge group in New Zealand that have cut their oil content to around 12% for common .25 to 1.20 glow engines, and have experienced NO failures after many hundreds to thousands of flights. And when you think about it, visualize 3 quarts of Methanol/Nitro mix, and a full Quart of oil to make a gallon. I have always thought that that much oil was ridiculous. NO internal combustion would even run with a mix like that, (oil typically does not burn) and yeah we can go off on the "lean run" syndrom, but folks Methanol burns a hell of a lot cooler than gasoline. Hell make it 50% oil and 50% Methanol and be REAL safe.
Morgans 17% has been great for me all of these years, Ringed, ABC's, AAC's, 2-strokes, 4-strokes, YS, yada, yada...to me 17% is overkill. NOW, an old lapped Iron or Steele Piston/Sleeve may run hotter and perhaps more oil would be in order.
Just my Dos Pesos...
You can see a Thunder Tiger .46 with 380 gallons through it getting a bearing change at
www.rcmodelreviews.com These guys are running around 12% oil as they have reported.