2 stroke v twin

Dr_C · July 21st, 2014, 11:13 PM

Originally Posted by bushmechanic

very nice Dr_C

do they publish the weight somewhere?

I bumped into Lars Nilsson yesterday (foLAN). He said the small 650 weighs about 40kg with an electric starter. Gear box is casette type. Price tag is some 8000€.

bushmechanic · July 22nd, 2014, 09:19 PM

nice! 40 kgs isn't all that bad but its a lot more than 27

bushmechanic · August 6th, 2014, 05:04 AM

been looking for this one

and this one

logjump · August 6th, 2014, 07:27 AM

bushmechanic · August 8th, 2014, 06:04 PM

for those not subscribed to Dr_Cs thread

bushmechanic · August 30th, 2014, 03:04 AM

When Honda created its fabled six-cylinder racebikes in the 1960s, it was pushing back the frontiers of the technically possible. Honda's attitude was that if its engineers could imagine it, they could build it--and it would win. The machines they created were the two-wheeled equivalent of the Apollo 11 spacecraft and the first manned mission to the moon in 1969.

Honda RC174: RC Reborn | Motorcyclist

Not a single engine bearing was a standard size, and some of the alloys and surface treatments used were quite unknown to modern science. Soichiro Honda, founder of the company, was also a gifted metallurgist.

three different types of con-rods in each engine, with progressively larger big-end bearings for the rods nearer the center, where loadings are higher.......... crankshaft is pressed up from 13 components, each no bigger than a domino. Unsupported, it is so flimsy it can be deformed by hand, yet it would have to spin without deflecting at more than 17,000 rpm

the following picture is not an rc174 but an RC166 .. similar problems

Idle · August 30th, 2014, 02:53 PM

Quote Bushmechanic
"I've been looking for..."

Found a bike that looks like it's owner. Catcher gear (baseball) on the forks.

bushmechanic · August 31st, 2014, 04:58 AM

5L vtwin

One of our readers from the land of Oz left a comment on yesterday's post about Roland Sands, suggesting another possible engine for the bike. What Dodgy found was a 5000cc Rolls Royce Merlin V-twin motorcycle engine!

This engine was built in 1982 and was adapted from a 27 liter V12 aero engine by Australian engineer Lucky Keizer. According to the listing it was used in a streamliner that holds the current Australian record for the 3001cc+ class. The particular V12 used as a source for this V-twin was originally at home on a Mosquito bomber.

The engine uses a handbuilt crankshaft, has 4 valves per cylinder, runs a Rochester carb on a GM 3/71 supercharger. It also includes nitrous with water and glycol cooling. Power output is in the 500 horsepower range though no torque figures are given, those are the numbers I'd like to see! It weighs 330 pounds.

This engine was previously installed in a motorcycle and the photo here has circulated around the Internet for some time. Lucky Keizer has put the engine up for sale, ready for someone else to install it in their own VERY special V-twin custom.

Of course, if you start with a V12 and make a V-twin, you have the makings of 5 more, right? Some resourceful machine shop should look into that, you never know, there may be a huge market for monster V-twin motorcycles. You have to wonder, though, what the rotating mass in that engine would do to the bike's handling when you try to tip it into the turns, could be exciting!