Fuel Question

Dredd Tue Aug 10, 2021 2:59 pm

Hi I've just received a Thimble drome car and can someone tell me what fuel is good for it and are there any checks I should make on it.
Thanks
Dredd

Marleysky Tue Aug 10, 2021 3:27 pm

Don't know if there was a Factory Recommendation for Fuel/Oil mixtures for these early engines. Here is a little information on Cameron :

https://coxengines.ca/cox/www.mh-aerotools.de/airfoils/cox_earlyengines.htm#Cameron%20.09

http://sceptreflight.com/Model%20Engine%20Tests/Cameron%20.09%20Marine.html

crankbndr Tue Aug 10, 2021 4:36 pm

I have a manual, it only says to use Thimble Drome fuel and a little extra oil for break in. One thing interesting is you could get gears for a different drive ratio.

Our forum Cox expert explained how to tell engine size in this thread

https://www.coxengineforum.com/t4541-thimble-drome-champion?highlight=thimble+drome+champion

Dredd Wed Aug 11, 2021 7:01 am

Thanks for your reply. I went out this morning to an RC shop and got some fuel and fuel line. You answered a question a couple of weeks ago about where to get a needle valve for this engine and it arrived this morning though it doesn't seem to fit. I'm wondering if you have any suggestions of how to get it to fit or it I'm doing something wrong.
Thanks Dredd

Dredd Wed Aug 11, 2021 7:03 am

crankbndr Wed Aug 11, 2021 7:37 am

I am having trouble with macro photo, measurements of mine.
length 38.78mm
barrel nut dia 4.8mm
shaft dia 1.51mm

Dredd Wed Aug 11, 2021 1:14 pm

Here are my measurements.

crankbndr Wed Aug 11, 2021 6:25 pm

The threads on the end of the spray bar in your photo look damaged, could the hole be obstructed? A 1/16 (1.57mm) drill bit will slide into my spraybar and is pretty tight.

Mecoa purchased Cameron, they show engines and parts.

http://www.cameronengines.com

I believe this is the needle and spray bar

https://www.mecoa.biz/shopdisplayproducts.asp?id=47

https://www.mecoa.biz/shopexd.asp?id=5496

What displacement is your engine .09 or .15? Mine is a .19, it is possible the .09 had a smaller spay bar. Don't know. Could enlarge spray bar with drill bit also.

Dredd Thu Aug 12, 2021 4:22 am

I've put a drill bit into it and it goes approximately 2.0-2.1 mm past the hole in the middle from the threaded end. I would assume the engine is the one in the pic on their website. Would the the whole bar on their site work?
Thanks again
Dredd

Dredd Thu Aug 12, 2021 4:24 am

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