SS snowblower engines tecumseh

[KE4AVB]

jgflawn,

Sorry if I offended you but as I said or should have said I am not an engineer so this level of expertise I have gotten into myself.

One suggestion that help you can log into the old Perr forum using your old account, search for posts by borat. After you find one you should be to drop him/her an email asking for some help by clicking on their username. It is all I can offer in the form of help.

AVB

[jgflawn]

I was never a forum member on PERR, just one of the the many unknown visitors so I can't login...although I did try to click on the users names previously (as you suggested) but won't work now for me...thank you.

[Deere2me]

oh, and on the original post for con rod length given the responses so far, I'd settle for an 'educated' guess within 1/2" +/- from anyone that has worked on the specific model?

So... let me see if I can understand SOME of yer long winded babble.
After reading the first two posts, (and skimming thru the others) I have come to the conclusion that you have a deeply FLAWED knowledge ( if any) of four cycle engines!
You say you need the rod lengths to calculate the piston acceleration to arrive at the theoretical max rpm before ring flutter occurs.
That's just plain WRONG !!! Rod length has absolutely NOTHING to do with piston acceleration...nothing. ( weight notwithstanding) The piston will accelerate at the same speed whether the rod is 5" or 5' long! Think about it. And what kind of "analytical" engine theorist would THINK of working a calculation based on tolerances " within 1/2" +/-" They build skyscrapers to closer tolerances for chit's sake! ( I just saw it on Discovery channel, between Swamp People and Duck Dynasty)
So have fun with your WOT,BHP,Torque/power/rpm curve calculations!
SHEESH!!!!!!

So, it would appear that I am WRONG!!! http://ftlracing.com/rsratio.htm However, I doubt the OP is gonna get anywhere with half inch tolerances!

[bobodu]

I have never heard anyone say " I have this engineer friend ...funniest most interesting guy in the world."

[bgsengine]

oh, and on the original post for con rod length given the responses so far, I'd settle for an 'educated' guess within 1/2" +/- from anyone that has worked on the specific model?

So... let me see if I can understand SOME of yer long winded babble.
After reading the first two posts, (and skimming thru the others) I have come to the conclusion that you have a deeply FLAWED knowledge ( if any) of four cycle engines!
You say you need the rod lengths to calculate the piston acceleration to arrive at the theoretical max rpm before ring flutter occurs.
That's just plain WRONG !!! Rod length has absolutely NOTHING to do with piston acceleration...nothing. ( weight notwithstanding) The piston will accelerate at the same speed whether the rod is 5" or 5' long! Think about it. And what kind of "analytical" engine theorist would THINK of working a calculation based on tolerances " within 1/2" +/-" They build skyscrapers to closer tolerances for chit's sake! ( I just saw it on Discovery channel, between Swamp People and Duck Dynasty)
So have fun with your WOT,BHP,Torque/power/rpm curve calculations!
SHEESH!!!!!!

So, it would appear that I am WRONG!!! http://ftlracing.com/rsratio.htm However, I doubt the OP is gonna get anywhere with half inch tolerances!

*VERY* useful and interesting information there.

Such would have been helpful to know as to the reasoning for wanting rod length. Now we know.

Might be interesting to start taking measurements of that as engines are torn down and start keeping a database. I would imagine that the rod length of those engines, if popular in karting or wherever, might be found at some race builder forums.

[jgflawn]

bsgengine: I would imagine that the rod length of those engines, if popular in karting or wherever, might be found at some race builder forums.

and that is true for the West bend 580....no lack of information exists...

As for the TH139 and the 1640M...scoured the internet high and low for specs before joining here to ask.....these engines certainly aren't popular in karting I can't open them up until winters over and then I have until November to put them back together all over again...

[jgflawn]

I just have to say....the calculus in that link made my eyes glaze over....

[38racing]

I just have to say....the calculus in that link made my eyes glaze over....

Haven't checked the link yet but it's been 43 years since I was at my prime in calculus.