World's First 160HP Stock Yamaha Aircraft Engine is FLYING!

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Jay Kempf

Curmudgeon in Training (CIT)
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Apr 13, 2009
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4,253
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Warren, VT USA
Just looked up the MR1. Seems like a perfect motor for a conversion. Already dry sump and EFI. Already built with a gear box on it so it has a good mounting flange for one of the PSRUs that are already available. Will the SkyTrax bolt right up to this, minus the existing gear box of course. The existing gear box is 1.47:1 to get the impeller speed down to 5krpm or so. Seems perfectly configured in the crate. Seems there are a lot of them out there for small dollars comparatively.
140hp out of 1 liter and seems the community thinks it is conservatively tuned. There are people putting on super chargers as well and they seem to be holding up. The bike version of this engine is 10krpm with different cams, head, intake, exhaust etc. Always thought PWC engines were the best candidates due to tight engine compartments and heat extraction needs as well as they need to run inverted and at all kinds of crazy g forces off plane.
 

jwmflying14

Well-Known Member
Joined
Oct 9, 2014
Messages
97
Location
Tucson
For everyone interested in a Yamaha, I would highly recommend looking up the Facebook group "Yamaha Aircraft Conversions."

The group is separate of Greg Mills and has straight forward, honest builds and data from users. The group admin have been working on getting a forum together to streamline communication.

Just be aware there are two groups "Yamaha Aircraft Engines" and "conversions." The conversion group is open to everyone and free of biased moderating from GM.
 

slociviccoupe

Well-Known Member
Joined
Apr 1, 2011
Messages
366
Location
Palm Bay Fl.
Yamaha also has an 1812cc na and supercharged version. No longer the mr1. No gearbox and direct drive. Turns 7600 rpm stock. Na makes 160hp and supercharged makes 230-240hp advertised but more like 300 something on a dyno.
They are the newer ho(n/a), sho( 6 psi supercharged), and the svho(11psi supercharged)
 

Jay Kempf

Curmudgeon in Training (CIT)
Lifetime Supporter
Joined
Apr 13, 2009
Messages
4,253
Location
Warren, VT USA
Does the 1812cc version weigh a lot more than the MR1, dry sump, EFI, yadda? Why if they had 1 liter that makes 140 do they need 1812cc for 20 more HP at the same RPM? Makes no sense...
 
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