Just goes to show you.....

[SmilinSam]

Dont ever put confidence in a seller telling you that the engine was overhauled. The question would then be , "was it overhauled right?" The oldest boy is starting small engine class this week in high school. I gave him two 12hp Dual Syncro Briggs out of AC B-series to play with. One we got, the engine had supposedly been overhauled. He took the head off here before he hauled to to school and yes, we found a nice clean bore with a fairly fresh .010 oversize piston in it. BUT... The piston would stop on the upstroke about 1/2" from the top of the cylinder. Looks to me , and the shop teacher, like someone used the wrong connecting rod:D

[Nick]

I think that qualifies as "partially overhauled" :D It's like the stories I seem to here lately like, "well it was running last fall" only to find out later it had thrown a rod.

[IronPony]

When someone tells you his horse won the race, ALWAYS ask how many horses were in the race LOL. Dan

[D-17_Dave]

I'd rather buy a tractor with a thrown rod, or something oviously wrong that I can see. That takes the mystery out of why they're getting rid of it in the first place.

[orangeone]

Dave, I will hold you to that when I pick up my motor at the end of the month. Ha Ha

[Agricola]

Maybe with the shorter stroke you would get lower compression. Lower compression would minimize the knocking due to lower octane gasoline. See, they are lightyears ahead of the crowd.

[KVANDY12]

Well at least you don't have worry about the piston hiting the top of the head. That why I build my motor my self, Alway know who to blame if its not right.

[AC808]

LOL..After I read that i was thinking exactly what John said!

[comet66]

I learned a long time ago "Rebuilt" doesn't mean anything unless you know who did the work. I bought a "55 F100" with a rebuilt 302 cid, in it and at high rpm it developed a lot of crankcase pressure. Turned out the rings on two pistons were in perfect alignment. Another time found old softplugs and plugged oil galleys. First I heard of a short conn. rod though.

[ridgerunner]

When running V-8,s with a blower you generaly run lower compression pistions than normal (prevents pre-ignition). Sounds like your half way there, SUPER CHARGE it. Nothing like blowing the snow out of your driveway and into the neighbors two houses down.

[ehertzfeld]

Paul, I like your thinking! lol Elon

[firefoxz1]

Maybe right connecting rod but wrong crank. If it's the wrong rod it might fall out the bottom of the bore or hit the counterweight of the crank. Did the 10's have a shorter stroke or just smaller bore, don't have specs here. They'll figure it out in shop.

[BLT]

Vertical or horizontal shaft engine? The reason I ask that on some Briggs engines, they used a longer stroke crank to get more CID. This would mean a shorter rod and a scalloped piston skirt to clear the crank counter weights. I converted a 7HP 17"CID engine to an 8 HP 19"CID by swapping the three parts. I had the parts by fluke. I think this might also be the case of the 25" CID engine to a 28" CID engine, but the problem is an half inch is a lot of gap. Should be more like a quarter, I think

[SmilinSam]

B series tractors only ever used horizontal shaft engines.... Might not be exactly a half inch. I was just eyeballing it without putting a ruler on it.

[BLT]

quote:

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Originally posted by SmilinSam
B series tractors only ever used horizontal shaft engines.... Might not be exactly a half inch. I was just eyeballing it without putting a ruler on it.

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Thats what I thought but had to ask anyway. Be interesting to see if there are any cast in numbers in the beam portion of the rod. I looked thru my cranshaft dimension book and the 24 thru 32 CID all call for the same rod dia and crank throw. The blocks were basically the same, dimensionally.