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Post  ian1954 Mon Dec 08, 2014 5:15 pm

The Mini Orkan 0.6cc diesel engine. The three piece crank case was manufactured from bar stock and sand blasted. Only 5 of these engines were made. The cylinder and spinner were either plain or anodized in red. All engines have dual ball bearings and capable of exceeding 28000 plus rpm.

Mini Orkan 0.6cc Mini_o10

Technical Data Orkan 0.6 cc:

Bore                           8.5 mm
Stroke                      10.5 mm
Rpm                          28,000 rpm
Weight                      45 gram
Intake                      Disc Valve

and no, I haven't run it or flown it but I have fondled it, admired it, petted it, displayed it ...................
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Post  roddie Mon Dec 08, 2014 9:32 pm

Hi Ian. Does that cylinder have SPI? (do most diesels?)
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Post  KariFS Tue Dec 09, 2014 1:30 am

Impressive numbers! When and where was that engine made?
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Post  ian1954 Tue Dec 09, 2014 3:56 am

roddie wrote:Hi Ian. Does that cylinder have SPI? (do most diesels?)

This does, quite a few diesels do - Oliver Tigers for example - but the majority don't.

I know a few combat flyers that introduced SPI to their diesels (by using a longer con rod) but they also reduced the venture size on the carb as they found it drew too much fuel.

There is some debate as to whether or not SPI and diesels is an improvement. I think that where it has been applied for top end performance it is a good idea but it can produce a temperamental engine.
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Post  ian1954 Tue Dec 09, 2014 3:59 am

KariFS wrote:Impressive numbers! When and where was that engine made?

It was made by Ronald Valentine in Florida. Not sure of the year but definitely pre 2000 and after 1984.
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Post  Oldenginerod Tue Dec 09, 2014 5:20 am

Ian.
You certainly come up with some incredible engines. 28,000 rpm is amazing for an undersquare engine.

I'm pretty sure most of my Taipan diesels have SPI.

Rod.
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Post  Surfer_kris Tue Dec 09, 2014 9:15 am

Nice engine. Smile

It would have been great to hear it run, and to compare that to what must have been a roar from the 28cc Orkan!

Link; Valentine engines

Mini Orkan 0.6cc 111-orkan-28-ccm
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Post  ian1954 Tue Dec 09, 2014 9:46 am

Surfer_kris wrote:Nice engine. Smile

It would have been great to hear it run, and to compare that to what must have been a roar from the 28cc Orkan!

Link; Valentine engines

Mini Orkan 0.6cc 111-orkan-28-ccm

When a diesel engine reach the 5cc mark, they became known as "finger biters". That is a "hand chopper". I would think twice about hand starting that. A kick back would be horrific!
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