Custom V-twin from two singles

**Kickaha** · 20th May 2007, 15:32

What did you do for a crank?

**Tints** · 20th May 2007, 21:13

for the crank we have made a new longer pin and are going to add malory to the counter weights on the crank to balance it to 50%. we also have had new cam chain sprockets made to take the two chains now required.

**McJim** · 20th May 2007, 21:18

Couldn't you use a SV650 engine with a shorter stroke?

Excuse me if this is a stupid suggestion - I'm not a techie but it seemed logical after a couple of beers....

**Kickaha** · 20th May 2007, 22:01

Originally Posted by Tints

for the crank we have made a new longer pin and are going to add malory to the counter weights on the crank to balance it to 50%. we also have had new cam chain sprockets made to take the two chains now required.

so you are running both rods off a common crank pin with the rods side by side?

**Tints** · 21st May 2007, 08:17

Originally Posted by McJim

Couldn't you use a SV650 engine with a shorter stroke?

Excuse me if this is a stupid suggestion - I'm not a techie but it seemed logical after a couple of beers....

got to love how beers make the world a lot more straight forward (apart from the next day)

the main reason that we stayed away from a complete motorcycle engine was that they were never designed to fit into a car with things like CVs coming off and monoques around them. also finding different pistons and rods was a pain in the arse because who would be silly enough to make an engine smaller (apart from us) unless there is a class for it.

also we want to be able to package the crank straight along the car so that the drivers head is almost between the v of the heads (to shorten the car) and have a custom integral gearbox out the back with our own ratios and quick change gear final ratio (no chains required and less weight).

**Tints** · 21st May 2007, 08:21

Originally Posted by Kickaha

so you are running both rods off a common crank pin with the rods side by side?

Thats it. the pins have had no problem with breaking in the standard bike and and we are not expanding it much in relation to its diameter so it should be sweet. we didn't realy want to have to go to a completely new crank so this was the best option.

**JeremyW** · 21st May 2007, 14:55

Originally Posted by McJim

Couldn't you use a SV650 engine with a shorter stroke?

Excuse me if this is a stupid suggestion - I'm not a techie but it seemed logical after a couple of beers....

Also Yamaha New Zealand has been a great sponsor of ours and has helped us out of many sticky situations

**Sketchy_Racer** · 7th September 2007, 13:42

Any updates or pictures guys??

This thing is flippen awesome!

**Tints** · 7th September 2007, 21:33

around it!

The engine runs! We have had the engine up to 6000 rpm so far and it has in the process spectacularly destroyed two couplings that join the engine to the dyno.
The score now is engine: destroyed two CVs, a rubber donut and a steel coupling, dyno: zero!
It has been good fun to get it going, but I now need a gearbox and clutch to be designed before it can be tested more. More fun and games in my future....
Dude does it sound sweet.
I will get some pictures of the destruction soon and post them.
i wish i could get a job destroying engine bits ( other peoples) , its just so fun.

**deanohit** · 7th September 2007, 22:36

Any chance of a vid or sound clip?

**Tints** · 8th September 2007, 11:29

But I don't want to post it on U tube for the world to see, is there a way I can post it here? Its a 2Mb quick time video for the sponsors

**Sketchy_Racer** · 8th September 2007, 16:22

Yeah, you should be able to put it on the same way you put pics on

**Tints** · 9th September 2007, 10:41

i have tried and it won't let me, any other ideas? can i email someone that runs the kiwibiker site to put it up for me?

**xwhatsit** · 9th September 2007, 13:25

They used to allow video uploads, but then disabled them when Youtube came along (save site bandwidth/storage). If it's 2mb, it might be too big, but if you rename it as a *.doc (video.mov.doc) and upload it it will work. Then we just have to rename it to play it.