Help determing cc size?
 

Hey all you conversion gurus,
I'm a newbie to this conversion stuff, already done a Featherlite 18cc with good results, still not on a plane as yet, still tweaking it. I'm hooked! Anyway a friend of mine donated some engines for the cause and I'm having very little luck determing the cc size on most of them, hope you guy's can help.
Here's what I got,
Homlite BP-250 UT# 08017F Blower, Homelite ZR series s725cdv UT# 20632 string Trimmer. I'm guessing they are 25 cc.
McCulloch Mac 3227 string trimmer, no other markings visible.
Craftsman 2.3/16 solid state chainsaw, no other markings.
Weedeater 1000 trimmer, no other markings, this thing is a monster, major compression the guy said it had a saw blade on it instead of a string head.
Seems most companys only list products from current to maybe 2 to 3 yrs. old.
Thanks in advance,
Robert

RE: Help determing cc size?
 

Robert, try www.ordertree.com they have parts listings etc for many brands under their corporate umbrella. They also have an 800 number. You can also try www.sepw.com and also do a search for the manufacturer and number in any search engine.

Tim

RE: Help determing cc size?
 

Robert,
You can measure and do the math or look for displacement markings, usually on the cylinder. Put a popcicle stick into the open exhust and close gently on it with the piston. Measure from the tip to the mark to get the bore. Use a simular probe through the plug hole to get the stroke. get the distance from the piston crown to the top of the head with piston at bottom. Then repeat with the piston at the top. Subtract the smaller number from the larger and you have the stroke. Plug the numbers into the calulator at the site below. I use milimeters myself. Look for the size just to the right of the carb mounting flange on the Homelite trimmers and on the cylinder base flange under the exhust on the classic Mac trimmers. Some smaller Mac trimmers use weedeater or Echo engines.

Dave



http://home.earthlink.net/~jalby/puter.htm

RE: Help determing cc size?
 

on the Mac trimmer, the first two numbers in the model number are the engine displalcement, so it's a 32cc

and on the craftsman, the 2.3 is probably cubic inch, which converts to 37.7cc

RE: Help determing cc size?
 

Fredbob,
Thanks for adding that info. That had come to mind, but my fingers got tired from all that typing, so I closed.

Davebob:D

RE: Help determing cc size?
 

yeah, easily overlooked, but easier than taking that dang muffler off to find out the other way... :)

I'll try to get pics of my converted mac here in about a week, I'm going to start collecting radio gear to finish assembling the Extra 330... that's going to bring the cost of the plane up a lot... (have about $20 in it so far with engine and plane together, no way I'm going to find that kind of deal on all the channels I'll need for this)

RE: Help determing cc size?
 

Hey guys,
Thanks for some of the heads up and links, it helps.
Out to the garage I go to see if some of these will run or even worth messing with, good for parts if nothing else.
Thanks again,
Robert