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View Poll Results: Engine size selection
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Initially O-320 or smaller
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33 |
21.43% |
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Later increased power/installed larger engine
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6 |
3.90% |
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Later decreased power/installed smaller engine
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0 |
0% |
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Initially O-360 or larger
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118 |
76.62% |
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Later increased power/installed larger engine
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3 |
1.95% |
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Later decreased power/installed smaller engine
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1 |
0.65% |
07-12-2007, 06:05 AM
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Join Date: Oct 2005
Location: OWASSO,OK
Posts: 192
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The engine for my 8A is an ECI kit with cold air induction,LASAR,high compression pistons and Vetterman tuned exhaust (not available from Vans).It should put out about the same HP as the IO-390 for $18000 less cost.Plan first flight next month.
__________________
Jim Gallaway VAF#782 2013 PAID 2014 paid
Gundys airport
Owasso,Ok
RV8A N184JG FLYING SOLD
RV7 N1717G FLYING sold
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07-12-2007, 07:40 AM
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Join Date: Oct 2005
Location: OWASSO,OK
Posts: 192
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And Airflow Performance F.I.
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Jim Gallaway VAF#782 2013 PAID 2014 paid
Gundys airport
Owasso,Ok
RV8A N184JG FLYING SOLD
RV7 N1717G FLYING sold
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07-14-2007, 09:09 PM
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Join Date: Jun 2005
Posts: 3,275
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My initial thoughts on engine size
I assumed that the O-360 or larger would be the majority choice and it was.
I did not expect anyone with a larger engine to change to one of less horsepower.
I expected more O-320s to later change to more power than O-360. Percentage wise that happened even with this small sample size.
I am one of the O-360 that is changing to higher horsepower. Since I was forced to overhaul the engine (in progress) I decided to go to 9.2:1 pistons. After mucho research on up to 10:1 pistons I was going to use 9.5:1 but could not find affordable ones. Some cautioned against higher than 8.5 pistons (can't use auto fuel and lowered TBO). I have no desire to use auto fuel and at the altitudes I fly at the engine rarely even sees 75% power.
Then I bought a high performance camshaft from Sky King that may provide more torque.
Finally I had the new cylinders ported and flow matched by Lycon. Some articles suggest 4 HP or more improvement from this process. Even if that is not accurate, the process should even the combustion process and help make a smoother running engine.
What all this means in actual performance is to be seen.
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11-06-2011, 05:47 PM
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Join Date: Jan 2005
Location: Round Rock, TX
Posts: 3,778
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250 hrs now on the O-320 in the 7A, put a many O-360's in the prop wash. 
With fuel prices soaring up up up... I'm liking the 320 more & more each and everyday. 
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Reiley
Retired N622DR - Serial #V7A1467
VAF# 671
Repeat Offender / Race 007
Friend of the RV-1
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11-06-2011, 06:15 PM
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Join Date: Feb 2006
Location: Connecticut
Posts: 321
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IO-360 M1B with a Hartzell CS prop. 180 hp and I can't imagine what I would do with more hp.
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Dave Chapdelaine
N821RV
RV-7
Flying as of 7/2/11
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11-06-2011, 06:47 PM
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Join Date: Sep 2006
Location: Townsend, Montana
Posts: 3,179
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Quote:
Originally Posted by Chappyd
IO-360 M1B with a Hartzell CS prop. 180 hp and I can't imagine what I would do with more hp.
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you'd join SARL and go racing!
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Retired Dam guy. Life is good.
Brian, N155BKsold but bought back.
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11-06-2011, 07:36 PM
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Join Date: Oct 2008
Location: Zephyrhills FL
Posts: 54
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The best advice I got when I was considering the purchase of a used RV6 was "Get the big engine" The only minus is the initial purchase price and I think someone said that is only about $1500. If you want the lower fuel burn and power of the O320 just limit how far you push the throttle in.
http://en.wikipedia.org/wiki/Flat_rated
Last edited by Danger Will Robinson : 11-06-2011 at 07:39 PM.
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11-06-2011, 08:54 PM
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Join Date: Apr 2005
Location: KSLC
Posts: 4,021
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Quote:
Originally Posted by Danger Will Robinson
The best advice I got when I was considering the purchase of a used RV6 was "Get the big engine" The only minus is the initial purchase price and I think someone said that is only about $1500. If you want the lower fuel burn and power of the O320 just limit how far you push the throttle in.
http://en.wikipedia.org/wiki/Flat_rated |
And pulling the throttle out...........works. My 0360 RV6A could get right down to the lower fuel consumption, that a 9A uses with it's 0320. On the other hand, I can climb faster, and ultimately cruise faster, when desired.
L.Adamson |
11-07-2011, 05:41 AM
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Join Date: Jan 2005
Location: Round Rock, TX
Posts: 3,778
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Heck... you should have went with the Big Engine... IO390 or IO540 in your RV and then add a designated fuel credit card you can just leave in the plane.
__________________
Reiley
Retired N622DR - Serial #V7A1467
VAF# 671
Repeat Offender / Race 007
Friend of the RV-1
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11-07-2011, 06:47 AM
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Join Date: Apr 2005
Location: KSLC
Posts: 4,021
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Quote:
Originally Posted by LifeofReiley
Heck... you should have went with the Big Engine... IO390 or IO540 in your RV and then add a designated fuel credit card you can just leave in the plane. |
Bigger engines can help you escape density altitude problems. Although, the plan is to avoid them in the first place, it seems that a lot of pilots still get caught with the problem. The ability to quickly climb, has much to do with horsepower..... As I live in mountain country, the extra horses are worth it.
L.Adamson |
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