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Yamaha Apex internal gear reduction.

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cblink.007

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Jul 7, 2014
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589
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Maryland, USA
Never trust an engineer who does not have grease under their fingernails.
Amen. Hence the reason I turned wrenches and mastered the drafting table before making the lateral moves to engineering and into the cockpit!

What's scary is that alot of my peers on the engineering side in flight test are completely incapable of understanding maintenance considerations, especially in the design process! I've been down here in Fort Worth the last few weeks on a team tasked with upgrading the design of our blade folding system, which is notorious in the V-22 community as being painstakingly difficult to assemble and rig! Likely because it was designed by people who did not consider maintainability in an austere environment. We'll get there.....eventually!
 

Ally Wilke

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Jan 19, 2021
Messages
50
Amen. Hence the reason I turned wrenches and mastered the drafting table before making the lateral moves to engineering and into the cockpit!

What's scary is that alot of my peers on the engineering side in flight test are completely incapable of understanding maintenance considerations, especially in the design process! I've been down here in Fort Worth the last few weeks on a team tasked with upgrading the design of our blade folding system, which is notorious in the V-22 community as being painstakingly difficult to assemble and rig! Likely because it was designed by people who did not consider maintainability in an austere environment. We'll get there.....eventually!
My mom has a car that I really think you have to take the engine out to get to the sparklugs😨
 

Ally Wilke

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Jan 19, 2021
Messages
50
Getting ahold of one of these apex engines can not come soon enough.I have been looking at images and documemts,but actual hands on measuring is going to be the way to go for me.Machining a whole new block is 5 grand.I am hopping there is enough on the face of the block for me to work with,but from paper it is not looking good.
 

Marc W

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Mar 31, 2017
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628
Location
Colorado
If you don't want the internal gear reduction, just take it out and drive directly off the end of the crankshaft. You will have to make your own gear housing but that is no big deal for you.
 

Richard Schubert

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Feb 5, 2009
Messages
221
Location
Pittsburgh, PA
The more custom parts you have the higher the cost.

Most alternative engine programs are trying to leverage the production volume and field experience of a "consumer volume" powerplant to reduce costs and maintain a certain level of perceived or actual reliability and performance. At some point an existing engine will become more attractive, unless its being done for educational or entertainment purposes. [see Raptor]

You have to be honest with yourself and ruthless with requirements or any project can balloon out of control pretty easily.
"Better is the enemy of good enough."
 

cblink.007

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Joined
Jul 7, 2014
Messages
589
Location
Maryland, USA
Getting ahold of one of these apex engines can not come soon enough.I have been looking at images and documemts,but actual hands on measuring is going to be the way to go for me.Machining a whole new block is 5 grand.I am hopping there is enough on the face of the block for me to work with,but from paper it is not looking good.
Try www.snowmobiletrader.com if you haven't done so!
 

Ally Wilke

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Joined
Jan 19, 2021
Messages
50
Yu
The more custom parts you have the higher the cost.

Most alternative engine programs are trying to leverage the production volume and field experience of a "consumer volume" powerplant to reduce costs and maintain a certain level of perceived or actual reliability and performance. At some point an existing engine will become more attractive, unless its being done for educational or entertainment purposes. [see Raptor]

You have to be honest with yourself and ruthless with requirements or any project can balloon out of control pretty easily.
"Better is the enemy of good enough."
Yup.I have felt like I am banging my head against the wall,but I have more ideas that I want to try.
 

Ally Wilke

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Joined
Jan 19, 2021
Messages
50
If you don't want the internal gear reduction, just take it out and drive directly off the end of the crankshaft. You will have to make your own gear housing but that is no big deal for you.
What I wanted to do was use the internal gear reduction because I can make gears to get the rpms right.The problem is the face of the engine will have to be redesigned also because there is not enough room for the larger gears.
 

Ally Wilke

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Jan 19, 2021
Messages
50
Why has not anyone used the one out of the jetski version and put a gear reduction on it?That one does not have an internal hear drive.Already has some kind of torsional dampner on it too.
 

Jason Crossley

New Member
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Mar 2, 2020
Messages
3
I believe the jet ski and boat versions have water coolant pass throughs to the water jacketed exhaust manifolds around the exhaust ports. Not an insurmountable issue to resolve, but does it really need solving if there is already a well designed, reasonably priced solution already available?
 

Vigilant1

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5,757
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US
Not an insurmountable issue to resolve, but does it really need solving if there is already a well designed, reasonably priced solution already available?
It would be convenient if a similar "base" engine for airplane conversions was mounted in both sleds and personal watercraft. On average, about the same number of new ones are sold every year in the US (approx 50-60k snowmobiles and 50-60k personal watercraft). So, there might be twice as many used engines. Also, a builder in Florida won't have a large selection of nearby wrecked snowmobiles.
 
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Kiwi303

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Jul 22, 2015
Messages
256
Location
En Zed. Aka The Shire.
So did a number of Japanese market FWD V6's. One bank has the plugs hard against the firewall...

Due to tax regulations they were getting sold off and scrapped in favour of buying new cars before the spark plugs wore out...

So why make it easy to change plugs if no-one will be doing it?
 
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