Some of the worse designed engines? 2

[enginesrus]

Just a fun thread. Lets talk about some of the worse designed engines not going back past the 40's, and all types, sizes and applications.
Why do they get the vote as one of the worse designed. I decided to do this not so much as to talk bad about a particular manufacture, but to hopefully help them and others improve the design.
In many cases such manufactures have other engines that are just fine or have improved what was a not so good design. Maybe we can do this without mentioning any particular brand if that is frowned on in here.
If this is not so good an idea, then the moderators can just delete this.

 

[BrianPetersen]

Pretty sure that scooter engine is still "running" when the bike is stopped (no auto stop/start), it's just not getting "lubrication" when stopped. Too long of an idling period means seized engine!

As for the 90-degree V6 engines ... at least those with 30-degree offset crankpins have an even firing pattern, even if they need a balance shaft to run smoothly. GM built loads of rough-running "odd-fire" V6 engines, and then a bunch of "semi-even-fire" V6 engines with 18-degree crankpin offsets. Due to GM not wanting to use different connecting rods from those in the V8 engine and not wanting to change the relationship between the left and right banks, the rods had to be next to each other (as on a V8) even though the journals were offset ... having a smaller crankpin offset allowed more cross-sectional area of the crankshaft at the plane where the two offset journals met.

http://www.britishv8.org/Articles/Odd-Fire-V6-Engines.htm

The 4.3 litre even-fire 90-degree V6 that replaced the earlier rubbish has different rods from the V8 allowing the crankshaft to be better with an actual separate journal for each rod. Didn't get a balance shaft until later on.

 

[3DDave]

Sigh - WHOOOSH!

 

[enginesrus]

Since we are showing some engines that are of different designs, and not really a bad design, how about the Commer Knocker?

https://www.youtube.com/watch?v=JrAoj5Cuu68