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Cox Engine of The Month
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"ULTIMITE COX 010: it has a clutch, E starter, throttle, exhaust, aluminum tank, aluminum venturi, gearbox with forward and reverse, and now its on a custom drawn and printed stand"



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Post  OVERLORD Mon Oct 23, 2023 4:54 am

I finally found a suitable engine with flywheel and clutch assembly for my Jerobee conversion. The silver bee tank is perforated for the use of an external tank. I think this is a modification by a previous owner as the factory cars with an external tank had a silver bee tank full of holes. The head has seen better days. I wonder what pinion is on there. The driven gear to use will depend on that.

I found an engine for my Jerobee  S-l12010
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Post  706jim Mon Oct 23, 2023 4:01 pm

Head looks fine. Just encased in baked on oil. You should be able to clean it off with some work.
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Post  rsv1cox Mon Oct 23, 2023 6:29 pm

It looks like a diamond in the rough Lieven. I'm eager to see what you do with it

Bob
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Post  OVERLORD Tue Oct 24, 2023 6:54 am

706jim wrote:Head looks fine. Just encased in baked on oil. You should be able to clean it off with some work.

Yes Jim, I'll wait and see when the engine arrives at my place.
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Post  OVERLORD Tue Oct 24, 2023 6:57 am

rsv1cox wrote:It looks like a diamond in the rough Lieven.  I'm eager to see what you do with it

Bob

Bob, the engine is destined for the Jerobee RC car that I'm converting from electric power to nitro.
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Post  getback Tue Oct 24, 2023 7:27 am

cheers cheers For getting an engine for your project , just a little bit more to not have to source bounce
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Post  rsv1cox Tue Oct 24, 2023 7:46 am

OVERLORD wrote:
rsv1cox wrote:It looks like a diamond in the rough Lieven.  I'm eager to see what you do with it

Bob

Bob, the engine is destined for the Jerobee RC car that I'm converting from electric power to nitro.

Yes, i meant cleaning it up, replacing the pull starter, fuel tank, etc.

Bob
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Post  OVERLORD Tue Oct 24, 2023 8:46 am

All right. I have a Silber Bee tank already and I have spare flyweights but I doubt that they are worn out.. And new small e clips to hold the pinion on the shaft in case the original flys away when dismantling
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Post  rsv1cox Tue Oct 24, 2023 9:27 am

OVERLORD wrote:All right. I have a Silber Bee tank already and I have spare flyweights but I doubt that they are worn out.. And new small e clips to hold the pinion on the  shaft in case the original flys away when dismantling

That's the fun part Lieven, making a diamond out of a stone. Smile

Bob
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Post  OVERLORD Sun Oct 29, 2023 1:18 pm

The last few days, I studied the above picture to find out how many teeth there are on the pinion.

I found an engine for my Jerobee  Screen18

I can see 5 teeth but how many are there hidden? 3 or 5? I suppose 3. That makes it the standard engine #501(if unmodified) with the 8T pinion. This would match with the tank.

The engine with the heat sink tank - the one with the holes - has a 10 teeth pinion. This matches the 56T driven gear that is on the car.

I found an engine for my Jerobee  Screen16

I found an engine for my Jerobee  Screen17
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Post  getback Mon Oct 30, 2023 6:23 am

I would say 8 also , that's weird how they matched the tank configuration and gearing . Pumpkin Do you have the gear needed ? Babe Bee .049
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Post  OVERLORD Mon Oct 30, 2023 7:22 am

Eric, if it's a 8T pinion, I need a 58T driven gear, which means I will have to go out shopping
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Post  roddie Mon Oct 30, 2023 2:56 pm

OVERLORD wrote:All right. I have a Silber Bee tank already and I have spare flyweights but I doubt that they are worn out.. And new small e clips to hold the pinion on the  shaft in case the original flys away when dismantling

Hi Lieven! I've missed you!! I need to read your other thread detailing the chassis, to get caught-up with this build. These cars have always fascinated me!

Regarding e-clips that fly away; try working inside of a large clear plastic bag. If a clip "pops" before intended.. the bag will catch it... in most cases.

The photo below shows a similar engine.. and I thought it might help you to identify the gear ratio.

I found an engine for my Jerobee  S-l16015

I'm guessing that the "Tee Dee" version (as in your Porsche) has the same gear ratio as the #508 AJ engine??

This is a photo of your Porsche's driven-gear.. but it looks like it's marked "52" and it appears to be a smaller diameter gear.  

I found an engine for my Jerobee  Imgp4410

I found an engine for my Jerobee  Imgp4510

Does the number of teeth on the driven-gear matter.. as long as they're all the same pitch as the pinion?
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Post  OVERLORD Tue Oct 31, 2023 3:52 am

Roddie, that's a good tip for the e clips. The gears for the TeeDee and the souped up BabeBee are the same : 10/56. The entry models as there are the Bandero and Comando a gear ratio of 8/58. These 56 and 58 gears are the only ones used for Cox driven cars.

The 52T gear is for an electromotor drive and this was on the Porsche when I bought it. There is also a 55T gear and 54T gear. For electric cars, the gear is mounted on the opposite - right-- side of the car.

You can check this out in the brochure you can find in the manual section of the forum.

The gears differ in size so you need a pinion that matches for each gear.
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Post  getback Tue Oct 31, 2023 6:53 am

Well if it boils down to it and you can't find one you may want to get in touch with https://gascarman.blogspot.com/ Larry Miller he has helped me a few times , may take him a day or so to get back to you though ... I have looked and the animal you seek is not around here USA . Very Happy Or have someone print ya one ??
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Post  HalfaDave Tue Oct 31, 2023 8:17 am

Hi OVERLORD,
I am here for:
-an awesome Jarobee Cox.049 car that never arrived around here.
-converting an electric to a more earth friendly methanol/castor fuel based system.
I wish you well,
Take care,
Have fun,
Dave
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Post  OVERLORD Wed Nov 08, 2023 2:55 pm

I received the engine yesterday. There is a 10T pinion but unfortunately, the throttle ring is missing. The pull starter works well and the engine has compression. The standard head has seen better days. The cylinder has 1 inlet port. I removed the pinion and the flyweights are present and move freely. some pictures:

I found an engine for my Jerobee  Pb080310

I found an engine for my Jerobee  Pb080311

I found an engine for my Jerobee  Pb080312
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Post  GallopingGhostler Wed Nov 08, 2023 3:26 pm

Lieven, just curious, but would a standard available Cox throttle ring work on that engine setup, to make up for the missing one?
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Post  OVERLORD Thu Nov 09, 2023 8:22 am

I don't know. The throttle ring available is made for a thick wall cylinder I think.
This cylinder has a ground surface. I'll measure both to see what that gives.
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Post  OVERLORD Fri Nov 10, 2023 6:04 am

According to Berney's advert, the inside diameter of the throttle ring is 14.8mm. The cox cylinder has an outside diameter of 14.73mm and the ground cylinder has a diameter of 14.65mm
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Post  GallopingGhostler Sat Nov 11, 2023 10:14 pm

OVERLORD wrote:According to Berney's advert, the inside diameter of the throttle ring is 14.8mm. The cox cylinder has an outside diameter of 14.73mm and the ground cylinder has a diameter of 14.65mm
14.8 minus 14.65 = 0.15mm = 0.006 inches or 6 thousandth. May be just a slight touch loose, but sounds like it may work. As they say in motorcycling, YMMV (Your Mileage May Vary). Wink

(Don't take my advice seriously, afterall, it is you that needs to be satisfied, not me. Very Happy )
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Post  getback Sun Nov 12, 2023 6:08 am

That sounds to loose to me , i would think 0,003 would bee closer to what your looking for ?? But I was thinking that all the throttled bee's were ground cylinders so there you go . Not getting a reliable idle and shut down will bee a problem in a car application. Leaves
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Post  OVERLORD Mon Nov 13, 2023 7:49 am

The throttle rings sold by Cox International are forstandard cylinders but the minimum rpm is 7000. I have spare set (thanks Bob) that I can use. Just out of curiosity, I tried the machined throttle ring on the cylinder that was on the engine but it was too small. This indicates that a ground cylinder and its throttle ring are a matched pair.
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