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80 or 100 hp?

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alienwes

Joined: 11 Dec 2012
Posts: 64
Location: Roswell, NM

Posted: Tue Aug 26, 2014 4:59 pm Post subject: 80 or 100 hp?

I notice that the Kolb website gives the same climb rates and takeoff distances on the Mark III with both the 80 and 100 hp 912. What have others discovered? Does the 100 hp offer any advantages/disadvantages on this airframe over the 80 hp?



Wes

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_________________
Wesley Elliott
Sport Pilot-PPC

Larlaeb

Joined: 02 Apr 2013
Posts: 75
Location: League City, Texas United States

Posted: Wed Aug 27, 2014 6:05 am Post subject: Re: 80 or 100 hp?

My MkIIIC has the 80hp and I haven't flown the 100hp or flown with one but the previous owner has.  He reports that he notices a pretty good difference at altitude.  Performance from high fields is better.  I would imagine that the 100hp is or can be faster too but as we all know the returns on adding hp to a draggy form diminish rapidly. 



Thanks,

Allan

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John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Wed Aug 27, 2014 7:31 am Post subject: 80 or 100 hp?

Kolbers:



Essentially, the 100 hp will climb faster than the 80hp, especially at high

altitudes.  Had a good chance to compare performance between my airplane,

100 hp, and a MKIII, 80 hp, during a flight from Price, Utah, to Wendover,

UT.  During the climb to aprx 12,000 feet ASL, the 80hp could not keep up.



Top speed and cruise speed remain about the same for the 65, 80, and 100 hp

engines on my mkIII.  Seems to hit a wall about 85 mph.



Actually, on a mkIII, the more power applied on takeoff, after a certain

point, the longer it takes to get off the ground.  I believe this is caused

by the configuration of our engines in the high pusher configuration.  I

experienced this the first time I tried to takeoff after swapping from 80 to

100 hp engines.  Came as a complete surprise.  Now, after many takeoffs, I

am not aware of the difference, if there is any anymore.



There are a lot of great advantages of both engines.  Don't have time to go

into them now.



john h

mkIII

Titus, Alabama



 

My MkIIIC has the 80hp and I haven't flown the 100hp or flown with one but

the previous owner has.  He reports that he notices a pretty good difference

at altitude.  Performance from high fields is better.  I would imagine that

the 100hp is or can be faster too but as we all know the returns on adding

hp to a draggy form diminish rapidly. 



Thanks,

Allan

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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

alienwes

Joined: 11 Dec 2012
Posts: 64
Location: Roswell, NM

Posted: Sat Aug 30, 2014 1:41 pm Post subject: Re: 80 or 100 hp?

Allan, John, thanks for the replies. I find it interesting that the 100 hp took longer on takeoffs. Too much of a good thing maybe?? 

Would be interested in hearing the benefits you have for the 80 hp John if you get the time. Seems it is more popular when I see Mark III's for sale. Maybe lower fuel consumption from the 80 hp?

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_________________
Wesley Elliott
Sport Pilot-PPC

John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Sat Aug 30, 2014 1:57 pm Post subject: 80 or 100 hp?

First off 80 hp runs on 87 octane unleaded.  100 requires 91 and higher.



Recommended spark plug change:  200 hours for the 80 and 100 hours for the

100.



80 runs a lot cooler.



Mine burned 4 gph at 5000 cruise.  100 hp burns 5 gph at 5000 cruise.  Both

have same cruise speed on my mkIII.



The 100 definitely climbs better and gives you a lot more boot in the butt

than the 80.  I could never go back to the 80.



I did the 1994 flight, US border and Deadhorse/Prudhoe Bay, Alaska, flight

with an 80.  Did fine, but the 100 gave me a lot more comfort flying over

Atigun Pass through the Brooks Range in Alaska.



Both are great engines.  Wish I had the money for a 912IS.  I always wanted

a good fuel injection system to simplify the system, but I think the 912IS

also has dual carbs.  ;-(



john h

mkIII

Titus, Alabama



 



Allan, John, thanks for the replies. I find it interesting that the 100 hp

took longer on takeoffs. Too much of a good thing maybe?? 

Would be interested in hearing the benefits you have for the 80 hp John if

you get the time. Seems it is more popular when I see Mark III's for sale.

Maybe lower fuel consumption from the 80 hp?



--------

Wesley Elliott

Sport Pilot-PPC

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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Sat Aug 30, 2014 2:00 pm Post subject: 80 or 100 hp?

Where did I get that idea from?  Probably the 914 turbo?



Looks like the 912IS is a single throttle body.  That makes a lot of sense.



john



 



Both are great engines.  Wish I had the money for a 912IS.  I always wanted

a good fuel injection system to simplify the system, but I think the 912IS

also has dual carbs.  ;-(



john h

mkIII

Titus, Alabama

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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

alienwes

Joined: 11 Dec 2012
Posts: 64
Location: Roswell, NM

Posted: Thu Sep 04, 2014 5:46 pm Post subject: Re: 80 or 100 hp?

Thanks John. The 80 hp has some really good attributes that I did not know of. I am used to everyone in the PPC world saying it's gotta be the 100 hp. It is probably because the PPC  wings are so ineffecient.  Thanks again for your input.

Wes

- The Matronics Kolb-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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_________________
Wesley Elliott
Sport Pilot-PPC

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