Chainsaw Repair

how it will work......

......when i last looked into changing degrees into mm's or inches (a year or two ago)......a few of the programs that are available on the web, do not account for 'pin height' (called compression height these days).....and may lead you to some blunders or maybe they are just calc mistakes?  i don't know how they came up with their calcs.......be aware.
knowing where the crown and bottom of skirt position is, the important thing.

They are probably calculating the compression height from a given squish clearance, stroke and rod length.

should have it done today. 
when done, it may have to be broken up into separate tiny files due to file size maximums.
don't know yet of the final file size.

.....just an update.  getting closer, one step forward two steps back.

using math formula's found previously on the www, led me down to an area calc that is not accurate enough, when checked against my other program.  believe i have got it sorted out now.

cannot add the blowdown portion to go along with the program using jennings calcs alone.  only way i know of doing so, would be converting portion of the program to be bmep based.  have done a straight bmep program in the past, but it's mixing apples and oranges here......i don't have the time.

will be adding a couple of extra features:  one will allow for timing adjustments to be made by either trimming the piston crown or skirts.  the other will show timing changes as the cyl base is machined.  does not make up for lack of blowdown.....but all i can do!

this can consume quite a bit of time......its like trying to get a 100 on a 500 question math test.  lol.

.......got the piston crown/skirt trimming figured out. 

had to scratch the base cut/cylinder dropping tool.  i am limited in working with degree measurements as inputs in the program.  measuring it all in mm is much easier imo.  too many additional calcs and time needed.

think staying w/old school in the ways of jennings is a better 16:1 theme anyway.

putting the finishing touches on the extended graph. 

the points WILL fall on the graph. hahahahaha. 

trying to make sure there are no bugs, by checking everything. 

program is small enough to post here.  though about adding some interactive graphics.......but it would make it too large to post.

filling up a tumbler and giving the eyeballs a rest for today.