Are the 1000 and 1100 engine cases identical (except for the piston bore size)? I see that the stroke is the same. If so, could the 1000 case be bored out to use 1100 standard size pistons? Just wonderin'...
Mike
Mike
Engine cases
- Thread starter mjanderson
- Start date
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slabghost
Well-known member
Cases are sleeved bores. I expect boring for 1100 pistons may not leave enough sleeve to function. Interesting idea.
Denver
Well-known member
Don't you typically have aprox .40 on about any motor? Would that be enough?
If I remember right, there is a 5mm difference in the bore between the two engines. Maximum overbore is 1mm, so I would be concerned about cylinder wall thickness. I also believe, but am not positive about the addition of the primary chain tensioner might make a difference in the cases.
I kind of figured it couldn't be as easy as it sounds or it would have been attempted already. :nea:
its been done i think ..there is a bunch of bad posting about outcome ... as cool as i keep the oldwing motors ..i wouldnt loose to much sleep switching pistons....ive never look into it yet who knows if the math adds up as same to hook up to rods
slabghost
Well-known member
maybe a better option would be to hone or bore the cylinders to the size needed to get them round and properly surfaced. Then have the 1100 pistons sized to fit?
now thats a great idea .... :BigGrin:
I like it, too! Not sure just how much you can take off the pistons - the skirts are not very thick. Certainly worth looking into.
slabghost
Well-known member
If possible to fit the 1100 pistons that way you could end with a like new 1050 cc motor or close to it. Upgrading to the newer primary chain and the gearing desired could make it very nice power source for many happy miles.
Denver
Well-known member
Weisco told me a few years ago they will take a rod, piston, with rings, & pressed wrist pins. You get FORGED pistons, rings, wrist pins, & clips, so you can easily remove pins without pressing them. Must order at least a dozen, will make at least two if not three different diameters. Think they were about $350- $400 each, X 12 = WAY too much cash even with two others to buy a set. Get cheaper after first dozen.
