ATCO - Villiers Midget two stroke engine 98cc -1955-

Hi all,
This is my latest aquisition, collected this morning. It is an old Atco - Villiers 98cc engine. It runs on the two stroke transfer port principle,
These little engines were used, as in this case, on Atco lawn mower between the 1930's and 1950's and produce about 1hp. It was started from cold in this video and it was the very first time I have started it!

I don't know alot about this yet as I havn't had it very long so any technical information is welcomed.
Hope you enjoyed the video!!!!

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[douro20]

They also made larger 2-stroke engines, mainly for power generation.

[steamwally]

They made one called the WXII which was a stationary engine in the true sense and used on farms to power a wide range of machines, like water pumps and corn mills. I don't think they were ever used on gen sets though.

There was the 147cc 2 stroker which was used on the atco standard mower and some bikes as well as the mk25C. Quite a few more but those were the main ones. Even made a couple of diesel 2 strokes, one being the D270.

[minibikerider1]

@steamwally it doesn't run on the 2 stroke Principal its not a principal its just a 2 stroke and these engines are not 1 hp there like 4 hp its because we changed our engine hp rating formula

[steamwally]

Actualy, I put "two stroke transfer port principle" for a reason, there are other types of two stroke engines that work in different ways. The Petter universal oil engine is a point in case, the fuel is not sent to the crankcase. The Petter Harmonic is another example, it uses the crankcase but uses the air pulse from the exhaust to scavange the crankcase, so you see....there are quite a few types of two stroke!

[steamwally]

Also, when this engine was built the old formula was used, all the sales bumpf for these engines rates it as 1hp and so thats what the engine is.

I don't buy the idea of the new rating, the old one was based on the theoretical power of 1 horse, this engine is a feeble little thing and no way would I call it 4hp, what ever the "EU" have decided the rating should be.....

[minibikerider1]

@steamwally this engine comparded to todays worker engines is about 4 hp most likely more towards 3.6-3.8 hp if you dyno it that could be all fig. out

[steamwally]

Yes, but my point is, It's an old engine so I'm going by the old system.

[gilessmokey]

@steamwally yep minibikerider is gettting a bit mixed up with hp ratings and two stroke principal.

[minibikerider1]

@steamwall yea thats probability the best way to go and and if you make a say a motorized bike and you live in a area with hp restrictions you can get under the gun

[minibikerider1]

@steamwally evidently you haven't seen to many new cubic engines there are 50cc engines that put out 12+ hp think about it and also I hate the new rating its a pain to use it is a 1 hp engine but the 1hp rating changed 2 times now it the most drastic its ever been so its a 1 hp engine on the old formula its like 3-4 hp now the engine dint change but the 1 hp has changed meaning with this new rating yes I know there a different forms of 2 stroke but i did not read the description well, sorry