Progression of Lawnboy engine designation letters

[bwright1818]

I just was looking through a Duraforce manual and noticed that it is referred to as an "E" engine. So, there are C's, D's, E's and F's. Why does it seem to me that, in the real world of model years, F's came before the Duraforce E's?

 

[Lawnboy77]

Good question...during the real Lawnboy years (Mid 50's to 1989) the engine series designations were sequential (A,C, D and F series). When Toro bought Lawnboy in 1989 that's when they broke ranks with the conventional sequential lettering system. The M series was Toro's first LB engine, then the V series and last was the E series...of course this only applies to the 2 stroke years, which ended in 2004.

 

[bwright1818]

Thanks. I was just trying to make some sense of the sequence....So there is NO "B" series?

 

[Lawnboy77]

To my knowledge there was never a mass produced B series engine. We have some former Lawnboy (OMC) employees around that could probably fill us in on why they skipped the B, or maybe it was possible that the B series did exist on paper, but for whatever reason was scrapped before it went into production.

 

[Phototone]

There were engines before the "C" series 2-stroke Lawnboy engines. They were Iron Horse. Perhaps those were given letters internally in Lawnboy, and the "C" engine was considered the 3rd version of the 2-stroke engine made by Lawnboy.

 

[javjacob]

It would be interesting to see all the specs (like displacement (cc), HP, RPM, torque ...ect) of all the different 2 cycle engines and if there were any changes throughout their run.

 

[Lawnboy77]

Check out this Toro link below. I think it has about all the specs you are looking for. It only covers engines through 1988 though. I'm not sure if Toro has a spread sheet like this for the post 1988 engines, but I'm pretty sure you can bring up the specs through their site by punching model numbers in.

https://lookup3.toro.com/ttcGateway/Acrobat/manuals/lball64.pdf

 

[javjacob]

Check out this Toro link below. I think it has about all the specs you are looking for. It only covers engines through 1988 though. I'm not sure if Toro has a spread sheet like this for the post 1988 engines, but I'm pretty sure you can bring up the specs through their site by punching model numbers in.

https://lookup3.toro.com/ttcGateway/Acrobat/manuals/lball64.pdf

Interesting how much difference these motors have in displacement.