Engine Swap Research - Page 3

scgtguy · #21 11-07-2011, 12:00 AM

not ever having a 108 myself I don't have hands on experiance .... but they are both wideframe tractors, I assume they would be the same.
If you take a read at this the differance is starters, charging systems and the like.

http://www.xtrememotorworks.com/Cub_cadet_History.htm

Bryan

Matt G. · #22 11-07-2011, 06:47 AM

To put any horizontally-opposed twin into a WF, you'd need to cut the frame quite a bit. Notice how the 82 series frames are made as not to have this problem.

I have seen this done a few times with different brands of engine. The end result is the same for all- much of the frame was cut away, weakening it badly. You'd also destroy the resale value of the tractor. I've seen a few modified like this on ebay and at auctions; they don't bring very much money.

I would either look for a V-twin or just stick with the original engine, the latter of which will be more than capable of doing what you want. Those B&S flat twins are inferior to the K-series Kohlers in many ways, too.

dsmithjr · #23 11-08-2011, 12:02 AM

Matt G, Im not concerned with resale I bought the tractor to use and 108s are really common it seems, so collectors value would not be that high. Again the reason for using the 18hp Briggs is because I have those and I cannot justify the prices Im finding on used kohlers or the #26 carb I need to even get my engine running. After researching and getting a lot of input from you guys (THANKS!) Ive about decided to sell or part out the 108 and the 2 Craftsmans I have and just buy another Cub already running.

dsmithjr · #24 11-08-2011, 07:43 PM

Alright I did some more measuring and I resolved some questions. A flat opposed Briggs has approx 3" from the engine base to the bottom of the cylinder. A cub 108 frame measures apprx 5" inches in depth to the base. So with that said apprx 2" of the frame would have to be notched the length of the cylinder head so MattG is right on that a major section of frame would be removed and that would cause weakness. Of course none of this applies to the Vanguard V twins. Now for my part I dont think it is feasible or economical to attempt this engine swap so Ill go to plan B and sell or trade some of my tractors and see how things turn out to see which way I go from here.

dsmithjr · #25 11-30-2011, 10:23 AM

Thanks to forum member Dave the old 108 is up and running with a rebuilt carb. I sold the Craftmans and the money is buying tools and Cub Parts. The 12hp Kohler sounds good and hopefully when the weather breaks Ill take it for a spin around the yard.

ACecil · #26 11-30-2011, 10:56 AM

You got a good looking 108.

_DX3_ · #27 11-30-2011, 02:42 PM

That 108 looks to be in real good shape. While your waiting on better weather, try some rubbing compound and wax. You will be amazed at what you may see.

BAMA1 · #28 12-07-2011, 11:40 PM

the frame only needs some minor trimming the biggest problem is the gas tank to air filter clearance

Matt G. · #29 12-08-2011, 06:45 AM

I would not consider that 'minor' trimming...a lot of the strength of the frame has been lost.

jpackard56 · #30 12-08-2011, 07:20 AM

Quote:

Originally Posted by Matt G.

I would not consider that 'minor' trimming...a lot of the strength of the frame has been lost.

I agree with Matt completely. the reason these Cubs are still usable 30, 40 and 50 years later is because they were engineered for strength and quality of product.
Go look at the modern box store units and you will see cut down and flimsy components... now we engineer too many things with "planned obsolescence" and "warranty periods" as the goal.
We do have some better metallurgy going on today, but more often than not unfortunately it is all about bottom line marketing.

I'm guessing that old Cub will survive its transplant and serve you well, but the strength and integrity of the frame truly has been compromised...