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Hit & Miss Gas Engine Discussion

Fairmont Engine Identification Help Needed


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  #1  
Old 09-05-2019, 03:03:51 AM
Dumpster Diver Dumpster Diver is offline
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Default Fairmont Engine Identification Help Needed

I just bought this engine at an auction. I was thinking there would be lots of information available from Google. Wow, was I wrong. Very little information available. A lot of expired web pages etc...
Serial # is 76997. It has a casting date on the block of 10-28-46.
What model is this one considered?

The other question I have is there was a C-5 carb with the engine. The 2 studs on the back of the block where the carb should bolt is spaced 4” apart. The mounting holes in the carb are spaced 3 3/4”. Any ideas what’s going on with tht? Thanks!
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Old 09-05-2019, 03:08:49 AM
Dumpster Diver Dumpster Diver is offline
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Default Re: Fairmont Engine Identification Help Needed

I managed to post 2 pics of the carb. Here’s the other pic I intended to post.
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Old 09-05-2019, 01:50:31 PM
Andrew Mackey Andrew Mackey is offline
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Default Re: Fairmont Engine Identification Help Needed

Hard to tell without direct pictures of the engine without that stuff on it. Front and side views are best. There should be a tag on the front of the engine hopper. Fairmonnt made several models during that time. ROC 4-6 HP, QB series 6-8 HP and others. There is a site you can contact about Fairmont - see archives for other posts on fairmont. The people there can tell you when the engine was built and to whom it was sent originally. The 1941 QBA I owned used a 12:1 oil mix using SAE 40 NON-Detergent oil. A 1946 ROC my son had used 16:1 with SAE 30. I have heard of people using modern oils in their fairmonts, but I do not recommend it, and by all means, do not cut the ratio. Parts are not easy to come by, like the common 4 cycle makes.
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Old 09-05-2019, 02:37:58 PM
Dumpster Diver Dumpster Diver is offline
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Default Re: Fairmont Engine Identification Help Needed

Thanks for the reply. Here’s more pictures. There is no tag or even a place that looked like a tag would have been installed.
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Old 09-14-2019, 07:30:23 AM
Dumpster Diver Dumpster Diver is offline
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Default Re: Fairmont Engine Identification Help Needed

Through other sources I found out this is an RQ motor. Also found out the carb should be a C8 instead of the C5. So I’m sure finding a C8 will take some time.

Good news is that I milled out the mounting holes on the C5 and it bolted up nicely. I rigged up a fuel tank and coil and it started up! These engine are anything but tame when they run. At somewhere between 8-13 HP they have some “pop” to them and are quite lively when running on a small stand. 😁
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