animal bore

[animal22]

what is the most you can bore a animal cylinder before it is to thin?

 

[flattop1]

I don't think its much, my guess is .060. but its prolly closer to .040

 

[Flash-o-matic]

I've heard at .030 the bore has a tendency to be unstable. Not stay round.

 

[Outrider]

Or you can do the aircooled equivalent of what we used to do to make really big inch flathead Ford V8s - bore it out into the fins so that it will take an oversized sleeve, then bore the new sleeve. Of course, that runs into the same problem we used to have running flathead Briggs engines - all the tricks that souped up a flathead Ford V8 engine were illegal in most karting rule books. I haven't purchased a WKA rule book for awhile (that's on this year's todo list), but it's a good bet that you'll run into rule book bore size limits at or before the point where physical bore instability issues become a problem.

 

[Bonanza]

I haven't purchased a WKA rule book for awhile (that's on this year's todo list), but it's a good bet that you'll run into rule book bore size limits at or before the point where physical bore instability issues become a problem.

I dont recall the exact bore size but remember it's approx .035 over

 

[Jimbo]

I would never bore it to the fins. There is nothing to stabilize the cylinder for ring seal or for that matter keep it from blowing off the first time you start it up.
I have done lots of them at 2.750" with the stock sleeve. You can go somewhat bigger though.