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04-23-2014, 08:27 PM
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Join Date: Apr 2014
Location: Russell, Manitoba, Canada
Posts: 3
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IO-540 CIB5
I am preparing to rebuild my Lycoming IO-540 CIB5, and was thinking of going with 9 to 1 compression pistons (Giving me aprox 275HP) instead of the stock 8.5 to 1. (260hp) My airstrip is short so thinking a bit more power would be nice. Wondering if this would be a bad idea? Also would I still be able to burn premium auto gas as an option if I wanted to?
Thanks.
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04-23-2014, 09:56 PM
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Join Date: Aug 2005
Posts: 97
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Quote:
Originally Posted by ZX-14
I am preparing to rebuild my Lycoming IO-540 CIB5, and was thinking of going with 9 to 1 compression pistons (Giving me aprox 275HP) instead of the stock 8.5 to 1. (260hp) My airstrip is short so thinking a bit more power would be nice. Wondering if this would be a bad idea? Also would I still be able to burn premium auto gas as an option if I wanted to?
Thanks.
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Keep in mind that the design performance criteria of most, if not all Vans aircraft is to operate of Van's 600 ft grass strip. Also keep in mind that all Lycoming engines that come stock with 8.7:1 compression require 100LL fuel. So, no, I don't think you will be able to get high enough octane to run 9: compression pistons. Perhaps some have real world experience that will say they get away with that combination.
The real answer for your performance needs is to keep the plane light. You might consider a 3 bladed prop to give you the extra acceleration you desire.
__________________
Kelly McMullen
A&P/IA
EAA Tech Counselor
KCHD
RV-10 40866
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04-23-2014, 10:40 PM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,420
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Welcome to VAF!
Walter, welcome to VAF.
My 540 has 9:1, not an issue-------although I have never tried to use mogas in it.
Lots of these engines out there with higher C/R.
__________________
Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010
Phase 1 done, 2/4/2011 
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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04-24-2014, 07:29 PM
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Join Date: Apr 2014
Location: Russell, Manitoba, Canada
Posts: 3
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Thanks Kelly and Mike!
Much appreciated!
Walter
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04-24-2014, 07:49 PM
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Join Date: Jan 2005
Location: Clarion, Pennsylvania
Posts: 550
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Walter, make sure that you fly a -10 before you make a decision as to whether it needs more power.
-Andy
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-Andy Turner
RV-10 N784JC
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04-24-2014, 07:56 PM
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Join Date: Jan 2010
Location: Southern Michigan
Posts: 1,966
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What Andy said. I flew my -10 for the first time a gross weight and could not believe how fast I was off the ground. IO-540 V4A5 with 8.5:1 pistons and standard 2 blade Hartzell prop. Gets off the ground fast and climbs like a home sick angel!
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David C.
Howell, MI
RV-10: #41686 Under Construction
RV-9A: #90949 Under Construction
RV-10: #40637 Completed/Sold 2016
Cozy MKIV:#656 Completed/Sold 2007
"Donor Exempt" but donated through Dec. 2020
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04-28-2014, 04:48 PM
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Join Date: Apr 2014
Location: Russell, Manitoba, Canada
Posts: 3
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Ok, thanks, will do! (Just going by the fact that nothing I have ever owned, flown, rode, driven or had a ride in so far in my life had so much power that it couldn't use more! Lol )
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04-29-2014, 02:50 AM
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Join Date: May 2008
Location: Brisbane Qld. Aust.
Posts: 2,271
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Quick response, take it or leave it.
9:1 sure why not
Mogas.....never.
Magneto's ONLY.
ANy further details PM me.
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______________________________
David Brown
DYNON Authorised Dealer and Installer
The two best investments you can make, by any financial test, an EMS and APS!
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