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Author Topic: rc car engine conversions  (Read 2020 times)

Offline Steven Kientz

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rc car engine conversions
« on: July 21, 2010, 02:55:51 PM »
Can anyone give me an idea as to what is being done to convert the Rc car engines to CL use. I am considering using one on a fast combat model, that I sport fly.

Thanks
Steve
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Steve Kientz
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Online kenneth cook

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Re: rc car engine conversions
« Reply #1 on: July 21, 2010, 04:20:56 PM »
Steve most car engines do have threads on the crank but are are very close to the case so you would need a thin prop I know at my local field I've only seen one person make one work I think apc works but depends on the size of the engine. If you have a lathe make a drive plate or get someone to make a custom one for you because its a press fit almost like a mccoy engine or similar. For the back plate, if it has a pull starter it will work if you leave it there but the prop won't be able to spin backwards you can make a new one if you want or get one made. Hope this is helpful some of those car engines really scream you plane should go pretty fast as from what I have seen in the past at my field. Shawn

Forgot to mention it really depends on the engine some have all threaded cranks while others don't  H^^
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Offline don Burke

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Re: rc car engine conversions
« Reply #2 on: July 21, 2010, 06:20:59 PM »
The "SG shaft" engines have a short 1/4-28 thread, and a longer   I make an alum prop nut with a 5/16 dia shoulder that goes almost through the prop.  No hub thinning or anything.  APCs are not bothered by the 5/16 hole.  I also make the "nut" long enough in front of the prop with the shaft hole far enough in so I don't have to butcher the shaft.

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don Burke AMA 843
Menifee, CA

Offline don Burke

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Re: rc car engine conversions
« Reply #3 on: July 21, 2010, 06:24:47 PM »
Sorry for the messed up drawing post.  Haven't figgered out how to do it right yet.
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don Burke AMA 843
Menifee, CA

Offline don Burke

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Re: rc car engine conversions
« Reply #4 on: July 21, 2010, 06:27:16 PM »
try again
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don Burke AMA 843
Menifee, CA

Offline don Burke

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Re: rc car engine conversions
« Reply #5 on: July 21, 2010, 06:30:09 PM »
and again,  RATS,  I tried rescaling to get it bigger and the dimensions came out scaled too, they are 4 times too big, except for the shaft hole. 
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don Burke AMA 843
Menifee, CA

Offline don Burke

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Re: rc car engine conversions
« Reply #6 on: July 21, 2010, 07:06:46 PM »
try again
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don Burke AMA 843
Menifee, CA

Offline Steven Kientz

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Re: rc car engine conversions
« Reply #7 on: July 22, 2010, 02:47:44 PM »
don
 How about a picture of the propnut and engine( as long as it doesn't give away any speed secrets). What is the typical prop size and RPM you are turning?

Thanks
Steve
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Steve Kientz
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Online kenneth cook

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Re: rc car engine conversions
« Reply #8 on: July 22, 2010, 06:17:29 PM »
It really depends on the engine you had in mind some engines have threads on the whole shaft some don't. These pictures might sum up any confusion you have. As for prop an apc 6/6, 7/5, 6/5 should do pretty good on a .15 or .16 on the tach a good engine should be about 20k give or take using 35% nitro or more if you want and use at least 18% oil. And remember it seems a prop loads the engines far greater then any gear system a car has. I hope this works for you Shawn
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Offline john e. holliday

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Re: rc car engine conversions
« Reply #9 on: July 22, 2010, 09:01:07 PM »
I guess you would have to replace the head also.   ???
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Offline don Burke

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Re: rc car engine conversions
« Reply #10 on: July 23, 2010, 11:59:44 AM »
Quote from: Steven Kientz on July 22, 2010, 02:47:44 PM
don
 How about a picture of the propnut and engine( as long as it doesn't give away any speed secrets). What is the typical prop size and RPM you are turning?

Thanks
Steve
The drive washer is added to the clutch drive to move the prop fwd to clear the carburetor.  If just a venturi is used, the spud on the nut can be a lot shorter and a supertiger/novarossi drive washer used.
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don Burke AMA 843
Menifee, CA

Offline don Burke

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Re: rc car engine conversions
« Reply #11 on: July 23, 2010, 12:00:44 PM »
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don Burke AMA 843
Menifee, CA

Offline Steven Kientz

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Re: rc car engine conversions
« Reply #12 on: July 23, 2010, 02:16:21 PM »
Thanks for the pictures ,Don. I'm really interested in the .25 or .28 engines.  I have several foam combat wings to assemble as well as a Super Satan(early '60s). Very little competition in Indy, actually very few C/L flyers( Indy Sportliners and several part timers at Plainfield Screaming Eagles). Have you had any experience with the Go Tech engines?

Thanks
Steve
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Steve Kientz
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Offline don Burke

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Re: rc car engine conversions
« Reply #13 on: July 23, 2010, 03:17:04 PM »
The construction of all the car engines is pretty much the same.  They take the sime kind of prop adapters and some kind of head clamp.  I've make the clamps both ways, turning down the stock one, or just making one from scratch.
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don Burke AMA 843
Menifee, CA

Offline Steven Kientz

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Re: rc car engine conversions
« Reply #14 on: July 24, 2010, 08:13:05 AM »
I was on Tower looking at parts, trying to get an idea for removing the huge heatsink. The head is 2 pieces, an inner to hold the plug and an outer to clamp it to the crankcase?
I'm going to look locally for a used engine to fiddle with, if i have any questions, I'll start this post again.

Thanks
Steve
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Steve Kientz
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Offline don Burke

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Re: rc car engine conversions
« Reply #15 on: July 24, 2010, 10:11:37 PM »
The heatsink is a one piece item.  It is normally held on by the head bolts.  
I attached a dwg of the clamp for my .36, something for a .21 or .25 would be similar, smaller size.
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don Burke AMA 843
Menifee, CA

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