interesting bikes found randomly..

[David]

You mad bastard! springs to mind but fun.

Snowmobile torque convertor, both cranks linked by chain drive. Mind your bell bottoms...

That photo is 1980s, fwd Ford Escort in the background

Dont think so Julian....

[derek badger]

Snowmobile torque convertor, both cranks linked by chain drive. Mind your bell bottoms...

That photo is 1980s, fwd Ford Escort in the background

Dont think so Julian....

I think it's Australian. Ford Falcon estate or similar?

[cheb]

Is the left header kinked in for ground clearance? As it has separate header & exhaust (I hesitate to say 'silencer') for each cylinder, presumably they don't all need to be the same length? Or is it, that for two strokes, the entire thing has to be a certain length?

On a 2T they all need to be the same length if you want performance. It's less an engine and more of a musical instrument.

Read about Walter Kaaden's work at DKW.

[Le_Fromage_Grande]

That photo is 1980s, fwd Ford Escort in the background

Dont think so Julian....

I think it's Australian. Ford Falcon estate or similar?

Looks like a US spec Escort

https://en.wikipedia.org/wiki/Ford_Esco ... _Wagon.jpg

[Mr. Dazzle]

On a 2T they all need to be the same length if you want performance. It's less an engine and more of a musical instrument.

Read about Walter Kaaden's work at DKW.

They need to be the same frequency I think, not necessarily the same length? They look like they're different diameters.

Ducati made a marketing song and dance about using different bore headers on similar grounds ISTR.

[Le_Fromage_Grande]

On a 2T they all need to be the same length if you want performance. It's less an engine and more of a musical instrument.

Read about Walter Kaaden's work at DKW.

They need to be the same frequency I think, not necessarily the same length? They look like they're different diameters.

Ducati made a marketing song and dance about using different bore headers on similar grounds ISTR.

Depends on what you want to do with a two stroke, for instance, RD500s run the front cylinders in a different tune to the rear cylinders to boost the mid range, but they are effectively two engines joined together on a common clutch, whether you could get away with this on a single crank, I don't know, I think that eventually you'd twist the crank on it's centre pin. But for cylinders to run the same on any engine the exhausts have to have the same resonant qualities on each cylinder, there's a number of ways you can achieve this, especially on two strokes, four strokes are much easier to work out, where it's just the pipe length, diameter and taper that need to be taken into account, bends don't have a massive effect so long as you measure the length correctly - you have to average the inside and outside lengths of the bend - all this is theoretical, real world results may differ, and you can't beat someone with experience making you an exhaust.

[Potter]

I remember reading that by the end of the two stroke era the Japanese had got so good at it that they didn't need to restrict bikes anymore, they just made them to only produce a certain amount of HP. This sounds a lot easier than it is, but prior to this they made bikes that worked and then restricted them to meet regulations.

Making a bike that revved out cleanly and felt like it wasn't held back in any way, but only producing a specific amount of power, was the result of some very clever engineering.

[JackyJoll]

I think that eventually you'd twist the crank on it's centre pin

Because some cylinders are more powerful than others?

In any multi cylinder engine, one cylinder is producing peak effective pressure and torque, while other cylinders are at negative pressure and torque.

[Mr. Dazzle]

Exhaust tuning is alive and well as a science, it's done on quite sophisticated computer models now as you'd expect. It didn't die with 2 strokes either did it, ask anyone with a variable valve timing engine or funny flappy exhausts.

[Taipan]

Stunning!

[weeksy]

https://www.ebay.co.uk/itm/HUSQVARNA-70 ... SwD1Bfz1k8



Whys it interesting then.... well, it's a Husky SM with 10,000 miles, which IMO is quite interesting in it's own right

[Taipan]

https://www.ebay.co.uk/itm/HUSQVARNA-70 ... SwD1Bfz1k8



Whys it interesting then.... well, it's a Husky SM with 10,000 miles, which IMO is quite interesting in it's own right

Sell it to me and I'll soon put a stop to that!

[weeksy]

https://www.ebay.co.uk/itm/HUSQVARNA-70 ... SwD1Bfz1k8



Whys it interesting then.... well, it's a Husky SM with 10,000 miles, which IMO is quite interesting in it's own right

Sell it to me and I'll soon put a stop to that!

Ah, you're just not cool enough for one matey.

[Taipan]

https://www.ebay.co.uk/itm/HUSQVARNA-70 ... SwD1Bfz1k8



Whys it interesting then.... well, it's a Husky SM with 10,000 miles, which IMO is quite interesting in it's own right

Sell it to me and I'll soon put a stop to that!

Ah, you're just not cool enough for one matey.

Right the NCX is getting a carbon fibre wrap. That should fix me image!

[weeksy]

Sell it to me and I'll soon put a stop to that!

Ah, you're just not cool enough for one matey.

Right the NCX is getting a carbon fibre wrap. That should fix me image!

As long as you match it with an MX helmet and some big boots !

[Yorick]

Stunning!

I had the Kettle when I was 18. And also had the GSXR which donated all the extra bits. Hmmm.

[rodbargee]

FAce ache picture

https://www.malarkeyengineering.co.uk/n ... Vmr0GzbY-M

[Le_Fromage_Grande]

https://www.ebay.co.uk/itm/HUSQVARNA-70 ... SwD1Bfz1k8



Whys it interesting then.... well, it's a Husky SM with 10,000 miles, which IMO is quite interesting in it's own right

It's a KTM with different clothes, not an Italian Husqvarna.

[Skub]

Stunning!

Now that's my cup of 2 smoke.

[Taipan]

Stunning!

Now that's my cup of 2 smoke.

Imagine standing behind that, smelling the smoke and listening to it idle as the baffles rattle against the circlips...