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Discussion Starter · #1 ·
I had a spare 3813 motor sitting in my garage and started cleaning up my sons 1970 bubble nose Ski-Doo and I got to thinking.............


Now I have some engine questions.

The steering shaft on the sled is very close to the carb so close it may be hard to get a gas line on the overflow line fitting. Does much gas come out of the fitting? could i plug it?

Is there another intake manifold available for this engine? One that is angled to the right would be great.
 

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doubtful, - the intake on the same engine used in the rv generator version, iirc the EV-4010 and EV-6010, is angled lower as the engine is laid over some to keep the generator's height reduced, but it wouldn't work on this engine in the vertical position - the carb would then sit at an angle

you can pick up manifolds cheap enough and should be to cut and weld it to give you the clearance you need

just a suggestion
 

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I don't want to go negative, but have you considered the angles of the terrain a snow mobile navigates over compared to most typical lawns.

Yes, the 3813 has a pressurized oil system, but is the oil pickup in the correct place when the motor is at a 35-45 degree angle for a sustained period of time? If not will the oil pump cavitate without oil ?

For example, the early John Deere - 300 series engine did not have a good pressurized oil system and as a result the engines failed prematurely because of oil starvation when mowing on grades that in my opinion won't be nearly as harsh as those you will be traveling over in a snow mobile.

Same for fuel supply. The constant up and down travel on a snow mobile typically at wide open throttle needed to maintain forward motion, just like a dirt bike, can get pretty violent. As a result, will you have fuel starvation?

But you like me, don't like to see such a great little engine go waste - mount it on a modified racing lawn mower :eek:mg: Heck - stick your GX360 on a modified mower and go racing :greendr:

I've wondered many times how the GX360 would react and handle on a modified racing lawn mower or the GX390 (18hp) ?

http://www.bing.com/images/search?q...7552A5612231A5C6BA5C022F&first=31&FORM=IDFRIR -a pretty bad boy Sears lawn mower for sure.

http://www.youtube.com/watch?v=LC7tNpe4NKU&feature=related

http://www.youtube.com/watch?v=A9tmEcYsK18&feature=related

http://www.youtube.com/watch?v=E1FwaHUav24&feature=related

http://www.bing.com/videos/search?q...0EC097BEB4603C580B3D0EC09&first=0&FORM=LKVR12

http://www.youtube.com/watch?feature=endscreen&NR=1&v=JZiLxU0-7s4

Hearing and watching the modifieds run - you have to admit is pretty cool
 

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Discussion Starter · #4 ·
Digging through the heat shields around the carb is on the to do list. Is there some good place to get manifolds to cut and weld?

I have considered the rough and tumble life of an snowmobile vs a lawn tractor. First of all the old 60,s snowmobiles are not what you would consider a high performance machine like the crotch rocket sleds being produced now a days. So I don't think I will be doing much sidehilling on 45 degree slopes with it. Most of my experience with these sleds is that they are better suited for groomed trails, flat fields, lakes, and roads. Also there have been several guys that have put the air cooled 13hp Hondas in these sleds with good results. So I figure why not give the water cooled 13 a shot. I am sure it will get tipped over some where along the way but I think if I give it a chance for the oil to drain back down before I fire it up gain it will be fine.
 

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check ebay - there's always someone parting out an engine and intake manifolds just don't fail, so it's the one item, if the seller is smart, will accept $10-15 offer for

i may have a spare one, i'll check - or someone here on the forum may have one to offer

and fyi, the 3813 and 4514 are the same block, cylinder head and intake manifold
 
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