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rowedenny
Joined: 09 Mar 2008
Posts: 338
Location: Western PA
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 Posted: Fri Aug 01, 2014 7:38 pm Post subject: Rotax 670 update |
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Figured I'd update everyone on my 670 swap.
I now have over 5 hrs on the 670 and am very happy with the performance. The Ski Doo Denso single ignition is incredibly smooth and idles fine at 1600 rpm with a two blade or three blade prop. Easily the best starting two stroke I ever owned. My old three cylinder 2SI 690L with 28mm Mikuni carbs is super smooth but this thing is even smoother. Must be the huge flywheel and I guess the crank rebuild is dead nuts on.
I'm still fine tuning the pitch and am currently running two 68 inch Powerfin F blades until I get three blades cut to 66 inches.
Performance is stout, it turns the same prop and pitch I ran on my 670 about 600 rpm higher than the 690 did.
I added pitch to limit the over rev and am still fine tuning, basically my solo climb went from 850 fpm to 1250 fpm, top speed increased from 72mph to 85.
Cruise at 5400 rpm used to be 62mph, now it's 70.
Fuel burn is looking pretty close the same, around 4.5 gallon per hour at 5400 rpm.
Still have some testing to do but am very happy so far.
The 618 style exhaust is much quieter than my old engine and family and flying buddies say it sounds stronger from the ground.
It definitely shits and gets on take off.
So far so good.
Dennis "Skid" Rowe
Mk3, Rotax 670,
Leechburg, PA
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Sat Aug 02, 2014 5:05 am Post subject: Rotax 670 update |
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Sounds good!
john h
mkIII
Titus, Alabama
Figured I'd update everyone on my 670 swap.
The 618 style exhaust is much quieter than my old engine and family and
flying buddies say it sounds stronger from the ground.
It definitely shits and gets on take off.
So far so good.
Dennis "Skid" Rowe
Mk3, Rotax 670,
Leechburg, PA
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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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kenw
Joined: 01 Oct 2015
Posts: 25
Location: Oklahoma City
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| Posted: Wed Dec 07, 2016 6:17 pm Post subject: Re: Rotax 670 update |
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dennis are you still flying the 670..?
ive been researching a purchase.
thank you in advance.
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kenw |
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rowedenny
Joined: 09 Mar 2008
Posts: 338
Location: Western PA
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| Posted: Fri Dec 09, 2016 6:20 pm Post subject: Rotax 670 update |
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If you are asking me, see my previous post. Have it sitting in the basement collecting dust.
Dennis Rowe
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