tecumseh crank swap?

[Don B.]

Old post, but note to last post-er just above this
one/ it was explained about the reason I couldn't simply do that.
Reviving this because I am at the same crossroads with an 8 and an 11 HP Tecumseh again. This time I'm repowering a Troy bilt horse.
I have 2 different Tecumseh engines this time, same general model numbers/series as before. I acquired another snow king OHV Tecumseh 11 from a neighbor's shed and just bought a power washer with a dead pump and a good HM80.
This time both choices are good engines. Both start easy and run strong. The 11 has the right crank for the tiller but has no air filter housing (no snowblower engine I've ever had has had an air filter) and id have to cut the 2:1 extended cam off. The 8hp in this case has the wrong crank. But as a non snow engine has more appropriate throttle/ governor linkage and complete air filter assembly. Due to the configuration of the gas tank and the extra hardware of the OHV version looks too bulky to fit behind the guard on this tiller. The 8 seems like the better option, but opposite of the first time I went down this road when the 8 hp had the crank I needed.
With both engines having same bore and stroke, but the OHV having more moving parts I can't see it being 40% more powerful. Are they really?
The last time, I transplanted the 11 onto a machine that originally had an 8 but I never got to use it with the 8hp in running conditions so I can't compare them. This time I'm replacing a very tired 6hp so either will be a noticeable power increase vs what's on this machine now...
Maybe I can set the 6hp out in the middle of the backyard when it comes off and start it up when the mosquitoes are at their worst

 

[Don B.]

Oh yeah the original parts swap on the first 2 engines went great. Worked fine, no problems at all.

 

[Don B.]

Another one sided reply to a thread most probably aren't interested in (due to lack of other replies, and replies that did happen, come from from post-ers that apparently didn't read the posts above theirs or they wouldn't have posted what they did .. )
But I can look back on this for future reference and there's value in that as I get myself into some goofy repairs..... Maybe someone else can get some good out of it in that sense as well....

So here goes.
On this latest 8hp L head vs 11hp OHV Tecumseh engine swap post (I can't be the only person here that gets into such predicaments, can I?)
I decided to leave the 11hp intact, run it dry on fuel at put it under the bench for now as it is a good engine. Instead of cutting the extended crank off (then finding a piece of equipment that needs an engine that has it) I pulled my current 8hp apart and gave my son the crank, he took it to work and had it machined down from 1" to 3/4", (cost me $0) and reassembled it with a new side cover gasket and 2 new crank seals, blasted and repainted the sheet metal, and am on the middle of bolting the 8 onto my Troy bilt in place of a mosquito fogger 6hp.
I don't welcome the idea of willingly and intentionally buying a Chinese engine ( like I have a choice of such things in the rest of daily life) so no thanks, no predator for me.... Especially when I can't even buy a predator as cheap as they are claimed to be, for what it cost me to transplant this engine onto my tiller....
Unlike the first one in this thread, this 8hp is a good runner and had no issues other than a wrong crank for what I wanted to put it on....
It was a late in the game option to pop up that I wasn't expecting, so I don't have to modify another good engine that might keep it from being used as intended.... (Cutting the extended cam)
And since the old 6hp cast iron original engine still runs (just tired) I might well overhaul that one. They ain't making them any more and parts aren't the problem to find that some make them out to be ... Unlike most here I don't have a problem with most Tecumseh engines.
I have 2, brand new NOS 3-1/2hp push mower engines that I'd love to find decks for....

 

[dhermesc]

I don't know where you live but there is this in Salina KS for $50

Tecumseh 5hp Engine

Dual shaft, good running, in salina, FCFS

www.facebook.com

 

[Don B.]

I've got one of those sitting here too.
Problem with that motor for this application is the original engine was a 6, I don't want to downgrade to a 5....