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Author Topic: EFI Bighorn  (Read 14362 times)

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Offline Uniflow

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EFI Bighorn
« on: September 24, 2012, 12:33:50 AM »
First fuel injected twostroke motorcycle to the top of Thompson's Track, New Zealand.




Well certainly the first fuel injected Bighorn anyway.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline TMKIWI

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EFI Bighorn
« Reply #1 on: September 24, 2012, 03:19:07 AM »
Where abouts are you Uniflow.?
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
If you don't fall off you are not going hard enough

Offline Uniflow

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EFI Bighorn
« Reply #2 on: September 24, 2012, 03:45:15 AM »
Thompson's track is a mud hole on the Kaimai rangers, Waikato. Better than no place to ride but not much. I'll have to see if I can borrow someones video camera and get some moving pictures.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline SachsGS

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EFI Bighorn
« Reply #3 on: September 24, 2012, 03:03:49 PM »
Were the disk valved Can Ams ever imported to NZ?
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline Uniflow

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EFI Bighorn
« Reply #4 on: September 24, 2012, 08:45:06 PM »
No, unfortunately. There are one or two privately imported units. One of these won the VMX pre 75 class last year.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline Uniflow

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EFI Bighorn
« Reply #5 on: September 24, 2012, 09:09:28 PM »
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline Uniflow

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EFI Bighorn
« Reply #6 on: September 24, 2012, 09:16:08 PM »
with a bit of modern technology, rotary valve engines need not be finished.


« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline factoryX

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EFI Bighorn
« Reply #7 on: September 24, 2012, 09:46:23 PM »

Agreed.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »


I ride an 03 yz250, wait 04, wait 05, what ever, they're all the same #$@% YOU!

Offline 2T Institute

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EFI Bighorn
« Reply #8 on: September 24, 2012, 11:16:05 PM »
I wouldn't mind one of those variable disc covers, emmachisit?
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline Uniflow

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EFI Bighorn
« Reply #9 on: September 25, 2012, 07:22:29 AM »
2T, Email me your phone number,  nckm@wave.co.nz
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline Coop

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EFI Bighorn
« Reply #10 on: September 26, 2012, 01:15:40 PM »
Good stuff.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
- Mike - Don't take life so seriously, nobody gets out alive.

Offline SachsGS

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EFI Bighorn
« Reply #11 on: September 26, 2012, 03:43:01 PM »
I've got a 1979 Gilera 125 MX with rotary valve induction in my collection, it looks like a Maico with a straight axle fork. If I'm not mistaken MZ pioneered disk intake valve technology in the 50's and when key people defected to the west this design made it's way to Japan (and your Bighorn - gotta love the name!).

 The Can Am's Rotax engine has an interesting history. Rotax began in Dresdan, Germany and was purchased by Fichtel and Sachs in 1932, whereupon production was transferred to Austria. In 1970 the company was sold to Bombardier of Canada and I've been told the rotary valved engines were already on the drawing board at this point.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline citabjockey

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EFI Bighorn
« Reply #12 on: September 26, 2012, 11:05:04 PM »
I wonder if anyone has ever considered using crank porkchops (i.e. not full round wheels) as a rotary valve mechanism instead of hanging that extra disk off one side of the crank?
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
Yamaha CT3, RT3, MX125, SC500, Toy Prius, Diesel F250 (it all balances out)

Offline Uniflow

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EFI Bighorn
« Reply #13 on: September 27, 2012, 03:25:08 AM »

These McCulloch engines use this system, crank cutaway running close to the crankcase. Exhausts are just for softies!
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline citabjockey

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EFI Bighorn
« Reply #14 on: September 30, 2012, 06:18:03 PM »
Thanks for the link.
Put THIS flat four in your Vee Dub Bug!

LOL

« Last Edit: December 31, 1969, 04:00:00 PM by ' »
Yamaha CT3, RT3, MX125, SC500, Toy Prius, Diesel F250 (it all balances out)