Engine Swap Suggestions

[ChiefRider 0]

My Charger 9 is a very nice, original condition machine but I don't wholly trust the Tecumseh HH100 engine. It is a 1971 vintage replacement of the original HH100 and has been running smoothly until recently. After 20 minutes or so of run time, it gives the impression it is starving for fuel. Playing with the choke will keep it running briefly. After a little cool down time, it will restart and run for awhile until the process repeats. The fuel system is nice and clean, and the symptoms sort of make me think there might be a problem with the coil experiencing an open circuit once it is heat-soaked. I have little enthusiam for buying used, expensive and probably unreliable electrical parts for the Tecumseh, so I'm wondering what might be a good substitute for this engine. I'd like to pick one up in anticipation of eventually replacing the Tecumseh. A Kohler K241? Something else? I'm not against more HP as long as it is a ready fit. I'd guess there are quite a few here who hve been down this road, so thanks for your help!

[condo630 7]

I am in the same boat with my Raider 9. I think I am going to go with a K241 or 301 Kohler once one pops up.

Your shutting down problem might be vapor lock in the fuel line. Does it travel behind the engine cowling?

[SAM58 30]

Just recently had the same problem with a 520H, it was junk in the fuel tank stopping up the filter on the tank valve, and after it set it would run for awhile until the junk built up again.

I would assume the Raiders have the same filter in the tank.

Cleaned out the tank and problem fixed. :hide:

[ChiefRider 0]

The tank is clean as a whistle, I'm also running an an-line filter, new fuel line and my HH100 has clips on the shroud that hold and route the fuel line outside the tin.

[WH nut 553]

Id put a condensor on it

[sgtsampay 117]

To answer your orginal question, go with a 10.5 diesel. I say this because of the power band it has and the great fuel comsumption. Thats my two cents.

[ChiefRider 0]

I like the idea of the diesel, but I wouldn't use a foreign engine. Cost for the engine would be prohibitivs as well. Last, I want to keep it vintage. Good idea though.

[Jim_M 179]

It still sounds like a fuel problem to me. The Tecumseh carburetors are pretty finicky, it doesn't take a very big piece of dirt to cause you problems.

[8993-520 0]

If you dont mind not keeping it vintage then I would go with a new overhead valve brigs. I have used them on several project repowers and they are great motors. Did one on a friends 67 w/h and he loves it. But a word of caution. The new numbers on motors is not the horse power. It is torque and they are lower than before. I looked long and hard to find a formula and found that 32 cc's = 1 horsepower. I put an 11.50 (250cc) motor on his mower with a 37 inch deck and as I said he loves it. And that is about 8 hp(7.2 to 7.9) depends on which formula you go with. But the gocart shop pit it on the dyno and it pulled 7.6hp and 10.9 tq. So the formula is pretty close. Hope all this bs helped a little lol. Thanks Mike c in NC.

[Guest]

.... But a word of caution. The new numbers on motors is not the horse power. It is torque and they are lower than before. ...

Power transmitted through a shaft can be found from first principles: P = T*angular velocity

All the information you need to make a relative comparison is still on the label.

[m2424j 9]

Try spraying fuel into the carb when it starts to die out. If it keeps running then you know it's a fuel problem. It sounds like a float problem. :woohoo:

[nomad327 0]

I helped a guy out that had a sears tractor with that engine, it had a vacuum pulse type fuel pump that used crankshaft pressure pulses to transfer the fuel. I think it was made by walbro, but the parts came through a tecumseh source. The parts were cheap and it fixed his fuel starvation problem. Sorry I'm not familiar with your motor to know if that could be your problem, but it's something to consider.