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Post by ruppluver on Sept 22, 2014 17:18:07 GMT -6
Has anyone tried taking a fan cooled Tohatsu,any size & making it a FA?? I was looking at a TR340,would be really simple to take shrouding off,cut the fan junk off & retain recoil. I think it would look cool,but don't know how long it would last.Any ideas,yes,no,don't care etc?  ?   |
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Post by Ruppsforever on Sept 22, 2014 18:02:02 GMT -6
As long as it is cold out and sled is moving I would think it would be alright. You might want to help motor with some air ducts. Making sure air is moving directly to the motor.
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Post by lemans1955 on Sept 22, 2014 21:33:24 GMT -6
Not specific to tohatsu motors but I have read and been told that removing the fan assembly and the drag and weight from the motor can cause harmonic imbalances, which causes a the motor to vibrate violently. I have never done it so I cannot offer any first hand experience to this.
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Post by ruppluver on Sept 23, 2014 7:01:17 GMT -6
I saw a single Sachs 340SS converted to FA,fan housing & shroud removed.The guy said it ran ok.Hirth 634's are hacked up quite abit,made into free airs. Just wondering.Does anyone on the board have one??? Thanks.  |
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Post by dacota25d on Sept 23, 2014 8:29:22 GMT -6
I converted hirth to FA but not tohatsu I've wondered if you could machine a head to make it like a wedge motor. But I just don't know if a regular fc would work cuz of the heads being turned
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Post by Ruppsforever on Sept 23, 2014 16:49:16 GMT -6
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Post by dacota25d on Sept 23, 2014 17:25:59 GMT -6
well mine isnt quite as cool as that one but it'll work and its only a 440. lightly massaged on the inside tho  |
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Post by ruppluver on Sept 23, 2014 17:37:24 GMT -6
Ruppsforever,have you had any cooling issues? Is air coming in where headlite was? NO duct work?
dacota25d,that is really cool.There is a sledder over by Perham,MN that cuts all the extra fan stuff off.
He makes the cases look like the Red Baron ones,NO recoil,just a rope to start.
I'm sure others have done this,keep the pics coming!! Thanks.
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Post by dacota25d on Sept 23, 2014 18:26:30 GMT -6
I think i may know who your talking about. Is it something like this?  |
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Post by pathfinder on Sept 23, 2014 19:23:43 GMT -6
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Post by ruppluver on Sept 23, 2014 19:52:06 GMT -6
Nice pictures pathfinder!
dacota25d,the guys name is Mike Fink,yup,thats the way his turn out.Hes a Cat guy,but likes the 634's.
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Post by Rupp Doctor on Sept 23, 2014 20:03:25 GMT -6
well mine isnt quite as cool as that one but it'll work and its only a 440. lightly massaged on the inside tho |
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Post by Rupp Doctor on Sept 23, 2014 20:04:08 GMT -6
you must be bored up in I Fall's
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Post by dacota25d on Sept 23, 2014 21:13:14 GMT -6
Yea that thing is cool its something like a 300 something hirth bottom with 634 top I would love to hear that run
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Post by kronnikracing on Sept 24, 2014 6:32:19 GMT -6
Ruppsforever,have you had any cooling issues? Is air coming in where headlite was? NO duct work? dacota25d,that is really cool.There is a sledder over by Perham,MN that cuts all the extra fan stuff off. He makes the cases look like the Red Baron ones,NO recoil,just a rope to start. I'm sure others have done this,keep the pics coming!! Thanks. We havent had it out all that much on the snow to know if there is cooling issues. But yes we trimmed the headlite area out to make it get as much cool air as we could. |
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Post by magnesium on Sept 24, 2014 6:56:42 GMT -6
Old old school. Cut off the cooling shroud,turn the fan blades off in a lathe,raise compression,run methanol and a megaphone,hack a big hole in the hood.Go kart guys did the same to chain saw motors.Wiseco and GEM were already in business before sled racing took off.
Then the manufacturers started making free air sleds.
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Post by kronnikracing on Sept 24, 2014 7:58:29 GMT -6
What kind of a chainsaw motor did they mess with? Dad and i have been trying to figure out a unique chainsaw motor to stuff in a kitty kat for mod classes for the little guy but havent dug into it all that much yet. Any ideas?
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Post by magnesium on Sept 24, 2014 8:21:52 GMT -6
I remember McCullough,(sp?),I think they called them Mac's back then. Methanol helped replace the lost fan cooling.
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Post by drrupp on Sept 24, 2014 9:11:35 GMT -6
This is a 634 that was machined down by the late Evert Reagle he was the head of the widow makers race team in the '70's Gene Bloom called him a super wrench . He also machined the piston skirts as he said the engine would not last long without it. He had several hours of testing with these engines and they won a lot of races.
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Post by kronnikracing on Sept 24, 2014 9:16:12 GMT -6
I remember McCullough,(sp?),I think they called them Mac's back then. Methanol helped replace the lost fan cooling. Huh mccullochs from the 60's? I will gave to see what cc'c they all had out there. Hard to believe those little engines would haul a go kart around. Cant be all that much horsepower i wouldnt think. |
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