Purchased some engine from Etsy

GallopingGhostler wrote:

sosam117 wrote:I was doing a web search for an old florescent light that is over the kitchen sink as the switch no longer worked. [...] I found on Etsy a sell that had the part (this light is over 60yrs old -- push button on/off). Like the old on/off buttons on the old stoves years ago.

Good score, I've done similar on exhausters, electric ceiling heater, etc. With replacement parts, got them running again. Other cases, found up-to-date replacement that sufficed. Got a new kitchen hood by same manufacturer but instead of recirculating (those never truly worked well), exhausts to outside, around $70 shipping included. Hired an HVAC firm to duct to outside. Now, kitchen has that greasy smoke and boiling vapors siphoned to the outside.

sosam117 wrote:Anyway, as I was looking through the seller's site, I ran across a bunch of engines for sale (on his site as well). Each were $38.00 a piece. [...] I bought all of them as they looked in good shape and no plier marks on them! Well, I got them in the mail along with my push button switch last Saturday (12/9/2023) [...]

I wonder where these Wen-Mac motor are used in what product (plane)?

Those are the separately sold in bubble pack card Testors 8000 engines, competed with Babe Bee sales but are the most powerful factory consumer grade reed valve engines available, even more powerful than the Black Widow.

See these early 1970's articles:
https://sceptreflight.com/Model%20Engine%20Tests/Testors%208000.html and
https://sceptreflight.com/Model%20Engine%20Tests/Testor%208000%20%282%29.html


Peter Chinn's Testors 8000 engine curve on 15% nitro fuel

https://sceptreflight.com/Model%20Engine%20Tests/Cox%20Black%20Widow%20%282%29.html

Don Hehlik Black Widow HP on 15% nitro (Mirrors Peter Chinn's)

They are set up for standard counterclockwise control line flight, bulkhead mount pattern is same as for the Cox .049 tank engines. If you want to use for free flight or for R/C, then rotate engine 90% (standard is sidewinder with cylinder to the outside of the C/L circle) so engine is inverted. This puts the tank fuel pickup at the bottom. You scored big.

GallopingGhostler wrote:

sosam117 wrote:Question? You say "If you want to use for free flight or for R/C, then rotate engine 90%. I don't see any screws to remove the tank. I did read in the reviews that you pop off the back (tank) off, but I'm not too sure about that? Where would pry on the tank without cracking it?

@sosam117 , although Peter Chinn mentions about disassembling, I would not even attempt it with this engine unless it is absolutely required. Peter is an engine expert and he managed to get it apart to show the modeller what it looks like disassembled. (I am speaking from my vantage point and no one else here - YMMV - Your Mileage May Vary. I am not an engine expert or "mechanic" - pushed paper for aerospace then government for 35 years. )

I would not attempt it (from my perspective again) because it is very easy to break the alignment pin on the tank. [Besides, the almost 50 year old plastic tank, is it still as resilient - pliable as it was then? I noticed that yours appear yellowed, from sunlight or heat stored in an unconditioned attic? or exposed to sunlight? or did Testors mold these from different shades of white? Mine I bought in the 1970's is still bright white.] Besides, even if you were to successfully pop off the tank from the crankcase, none of the other orientations have pin channels, engine crankcase could re-orient itself due to vibration while running.

I was referring to physically remounting the whole engine tank and all as a unit, so that the fuel pickup location would be at the bottom, so tank could fully drain in flight. Then, the cylinder points down, engine is now inverted.

If you hold the engine as though it were to be mounted on a C/L aircraft, the fuel pickup inside the tank is located in the middle of the tank right side. This is looking at the back of the tank, basically the pilot's view while seated in the cockpit, which most article magazine writers and plan designers use as a reference point. Due to centrifugal force in the C/L circle, then fuel pickup is optimally located.

sosam117 wrote:And when you turn it 90° is it clockwise or counterclockwise? (looking from the front of the engine.)

In that orientation, with cylinder pointed to the left ("pancake") looking at the prop nut, you rotate the engine complete with tank counterclockwise 90° so the cylinder is inverted, pointing down.