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Post  roddie on Thu Nov 23, 2017 12:44 pm

Bob (rsv1cox) had recently sent me some Wen-Mac/Testors parts-engines to help me rebuild an engine that had a broken crank-pin and connecting-rod. Amongst them was a Wen-Mac/AMF Mark XI that was pretty much complete.. and I think may be a runner.

Wen-Mac slotted glowhead Wenmac25
Wen-Mac slotted glowhead Wenmac26

Of interest is that it uses a glow "head" rather than a plug. It also has wrench "slots".. rather than "flats".. as do the later glowheads. A "Cox" .049 wrench will fit the slots.. but can slip under the top cooling fin if not used carefully.

Wen-Mac slotted glowhead Wen-ma14
Wen-Mac slotted glowhead Wen-ma15

When removed; there was a thin copper gasket in place.

Wen-Mac slotted glowhead Wen-ma16

This glowhead is limited to mid-1963 production when the standard 1/4"-32 plug heads were discontinued. Later that year, the glowhead-style was changed to having "flats" for a 7/16" wrench.

Thanks to Guy Eaves/Mark Boesen for providing previous data that helped to draw these conclusions.

This engine would fall under #21 on the lists shown below.

Wen-Mac slotted glowhead Eng_1610
Wen-Mac slotted glowhead Eng_1611
Wen-Mac slotted glowhead Hotsho10
Wen-Mac slotted glowhead Hotsho11
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Post  Mark Boesen on Thu Nov 23, 2017 9:37 pm

Thanks, very cool engine, great post!
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Post  Cribbs74 on Fri Nov 24, 2017 12:07 am

Don’t agree with the coolness Wink however, Cox designed the wrench to allow doubling them up to get a better bite and a firmer grip. You may notice that there are dimples in that wrench, and if you slide another wrench on top, they sort of lock together. It may or may not work with that head.
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Post  Marleysky on Fri Nov 24, 2017 10:47 am

Cribbs74 wrote:Don’t agree with the coolness Wink  however, Cox designed the wrench to allow doubling them up to get a better bite and a firmer grip. You may notice that there are dimples in that wrench, and if you slide another wrench on top, they sort of lock together. It may or may not work with that head.

One big + for you Ron. I never knew that about the wrench’s. I always thought that dimple was just a punch press release pin or something. HA! I learned something today, thanks.

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Post  roddie on Fri Nov 24, 2017 11:56 am

Mark Boesen wrote:Thanks, very cool engine, great post!

Thanks Mark! I would suppose that if Wen-Mac/AMF made a wrench to fit that head.. it would be a rare item. I've never actually seen a wrench for the later heads. Did Wen-Mac/AMF/Testors ever offer a multi-tool like Cox did, for performing engine-work?
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Post  chevyiron420 on Fri Nov 24, 2017 2:40 pm

Roddie, thats a very cool engine! I have a wen mac wrench for the later glow head in my flight box. Also my original wen mac 57 chevy I had as a kid had a wrench with it that fit the head shown in your pic.
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Post  NEW222 on Fri Nov 24, 2017 4:08 pm

Cribbs74 wrote:Don’t agree with the coolness Wink  however, Cox designed the wrench to allow doubling them up to get a better bite and a firmer grip. You may notice that there are dimples in that wrench, and if you slide another wrench on top, they sort of lock together. It may or may not work with that head.

I will be the second to say thanks to you for this neat little tip. I too did not know about this, nor would I have ever thought of this either.
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Post  NEW222 on Fri Nov 24, 2017 4:11 pm

roddie wrote:Of interest is that it uses a glow "head" rather than a plug. It also has wrench "slots".. rather than "flats".. as do the later glowheads. A "Cox" .049 wrench will fit the slots.. but can slip under the top cooling fin if not used carefully.

So, if I understand this correctly, the rounded top part in the picture is in fact a glow plug? If so, that is very neat and streamlined. If it was mine, and didn't work, I would have more than likely tossed it out in the trash. Another thing learned today!
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Post  Marleysky on Fri Nov 24, 2017 4:24 pm

roddie wrote:
Mark Boesen wrote:Thanks, very cool engine, great post!

Thanks Mark! I would suppose that if Wen-Mac/AMF made a wrench to fit that head.. it would be a rare item. I've never actually seen a wrench for the later heads. Did Wen-Mac/AMF/Testors ever offer a multi-tool like Cox did, for performing engine-work?

Rare? Medium Rare. I had to dig thru a few old cigar boxes stored down in the dungeon to find these:

Wen-Mac slotted glowhead 5b1ffd10
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Post  roddie on Fri Nov 24, 2017 4:36 pm

chevyiron420 wrote:Roddie, thats a very cool engine! I have a wen mac wrench for the later glow head in my flight box. Also my original wen mac 57 chevy I had as a kid had a wrench with it that fit the head shown in your pic.
Phil

Thanks Phil! I did a little work on that engine yesterday. I solvent-flushed the NVA using a fuel-bulb.. (also the Testors engine..) I then picked-out two 6 x 3 props from my stash.. and using my drill-press; progressively drilled their hub-holes up to a #20 (.161") drill, to fit the 6-32 threaded crankshaft.

The Mark XI is shown below with a MA prop. I chose that prop, because it's still available.

Wen-Mac slotted glowhead Wen-ma17

Below is the Testors engine with a JZ wooden prop. This prop is significantly lighter in weight, than any of my other 6 x 3's. I wanted to run it for a comparison.. and will swap the two props between engines, to see how they run.

Wen-Mac slotted glowhead Testor13

I'm suspecting rpm's in the 13-14K range.. as you achieved with your recent bench-runs. I have a few 3 and 4-blade Testors propellers.. in 4" and 5" diameters that I'm sure would "scream higher".. but I don't want to run those. A 6" propeller might "lug" the engine a bit.. but I suspect it's worse to exceed the design-rpm of the engine. I don't know what that # is.. but these engines seem to have a high-degree of rod/crank-pin failures. Maybe that's due to poor-quality materials. When I run these two engines; I intend to run them either "rich".. or with plenty of oil in the mix.. if I lean them out.
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Post  roddie on Fri Nov 24, 2017 4:41 pm

Marleysky wrote:
roddie wrote:
Mark Boesen wrote:Thanks, very cool engine, great post!

Thanks Mark! I would suppose that if Wen-Mac/AMF made a wrench to fit that head.. it would be a rare item. I've never actually seen a wrench for the later heads. Did Wen-Mac/AMF/Testors ever offer a multi-tool like Cox did, for performing engine-work?

Rare? Medium Rare. I had to dig thru a few old cigar boxes stored down in the dungeon to find these:

Wen-Mac slotted glowhead 5b1ffd10

Cool stuff Rene!!! Thanks for "digging-around".. I appreciate that buddy! Happy Thanksgiving!!
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