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High HP O-360 engine

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ronlee(at)pcisys.net
Guest

Posted: Mon Feb 27, 2006 10:49 am Post subject: High HP O-360 engine

Reading about the Super 7 I have some questions to ask about

getting a higher than 180 HP engine out of an O-360.  (not IO

or angle valve)



You can put higher compression pistons in for some increase

above that provide by 8.5:1.    Obviously there are pros and cons.

Other than not being able to use autogas how would one determine

how high to go (9.2, 9.5, 10:1)?



Supposedly there is a high torque Camshaft.  More torque must be good.



Porting and polishing of something is mentioned.



Angle cut of the valves may offer something.



Where is the highest/most cost-effective pay-off in getting more horsepower

from an O-360?



Ron Lee

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martin(at)gbonline.com
Guest

Posted: Mon Feb 27, 2006 7:54 pm Post subject: High HP O-360 engine

Ron and all listers,



Five years ago when I built my RV8, I wanted as much power as possible, and 

I had met several other RVers with pumped up Lycoming engines, I decided to 

pump up my choice which was a standard IO360AlB6.  I found a suitable core 

and sent it to Monty Barrette for overhaul.  Monty advised me that I would 

definitely have more power with a 10-1 compression engine, however he 

advised me that I should not expect a normal TBO of 2000 hours.  He advised 

that a TBO of 1000 hours would be more likely, and possible less depending 

on how I would run the engine.  Since I wanted to go fast and I considered 

myself  to be maintenance oriented, I convinced myself that my engine would 

last longer because I would be extra careful!!!  (change oil regularly etc.) 

To make a long story short, my engine lasted 946.2 hours.  I had noticed a 

light nocking noise in the last hours of operation, but dismissed that 

because I had been told by know it alls that some mechanical noise was to be 

expected.  (This was my first Lycoming engine, I had over 3000 hours in 

radial engines) .  When I changed the oil and the filter, I found that the 

oil screen was plugged tight with what looked like fish scales and the 

filter was full of bearing material and steel slivers.  This all occurred 

just after flying home from Florida via Phoenix to Green Bay  with 2 plus 

hours over florida swamps in real IMC and another 4 hours over mountains.  I 

immediately pulled a cylinder and discovered that all of the bearings were 

toast.  Needless to say, I am now a more religious person. with a very 

healthy regard  for the advice that was given to me by Monty Barrette  ie - 

do not expect a high TBO with a pumped up engine - more power - Yes, long 

TBO - NO..

I replaced this engine with a new IO390.  I am very happy with this engine, 

it has more noticable power than the IO360, averages  l/2 gal per hr more 

fuel consumption at normal cruise 23x2300 and yields an average 5mph 

increase speed  atabove power setting.  The engine is approximately 10 lbs 

heavier, however I am now using a AeroComposites  74" prop that is about 

15lb lighter than my Hartzell, so no cg. problem was noticed .

I hope that this information will help you with your engine choice.   Please 

do not ask for email replys.  It you want to discuss this call me (at) 920 619 

6968.



Dick Martin

RV8 N233M

the fast one

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