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03-31-2013, 12:43 PM
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Join Date: Dec 2009
Location: Bismarck, ND
Posts: 212
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IO360 valve lift
Hey engine gurus.
I can't seem to find the valve lift data in my SSP1776 table of limits. Can anyone supply me with lift at the valve (intake and exhaust) on an IO360 A1B6 angle valve? I am also interested in parallel valve data.
I am building a flow bench and am interested in anyones experience porting the Lycoming cylinders. Particularly flows at 28" differential before and after porting.
The intake ports have a nasty sharp corner on the small radius of the intake port. I realize there is not much that can be done with the port, but how much difference is gained by smoothing the sharp corner?
__________________
Larry Buller
RV7A slow build, Tip up, IO360 200hp, Catto 3 blade, Dynon Skyview, arinc 429, ems, SV transponder, Garmin GNS430w, Aera 560, Dynon D6.
FLYING!
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04-04-2013, 08:58 AM
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Join Date: Aug 2012
Location: Newberg, OR
Posts: 18
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Cam lift
Your -A1B6 uses the LW-11754/LW-18840 assembly camshaft which has .350" lift on both the intake and exhaust lobes.
Yes, blending/smoothing the sharp edge where the seat boss transitions into the floor of the intake and exhaust ports makes a difference; moreso than trying to enlargen the port size itself.
hope this helps. Grub
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04-05-2013, 03:11 PM
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Join Date: Dec 2009
Location: Bismarck, ND
Posts: 212
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cam lift
Thanks for the info on the cam lift. Do you know what the valve lift is?
__________________
Larry Buller
RV7A slow build, Tip up, IO360 200hp, Catto 3 blade, Dynon Skyview, arinc 429, ems, SV transponder, Garmin GNS430w, Aera 560, Dynon D6.
FLYING!
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04-05-2013, 03:58 PM
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Join Date: Jul 2009
Location: Mojave
Posts: 4,642
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looks like the parallel valve rockers are 1.28 ratio....
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WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.
Michael Robinson
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Harmon Rocket II -SDS EFI
RV-8 - SDS CPI
1940 Taylorcraft BL-65
1984 L39C
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04-06-2013, 03:05 AM
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Join Date: Dec 2009
Location: Bismarck, ND
Posts: 212
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valve lift
thanks.
does anyone have flow data?
__________________
Larry Buller
RV7A slow build, Tip up, IO360 200hp, Catto 3 blade, Dynon Skyview, arinc 429, ems, SV transponder, Garmin GNS430w, Aera 560, Dynon D6.
FLYING!
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04-06-2013, 07:43 AM
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Join Date: Mar 2005
Location: SE Florida
Posts: 1,499
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Quote:
Originally Posted by Toobuilder
looks like the parallel valve rockers are 1.28 ratio....
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What is the source of the info you quote? I'm not challenging it, just curious where it comes from? What is the rocker arm ratio for the angle valve engines? I thought I had that info, but can not seem to find it now.
Charlie |
04-06-2013, 08:07 AM
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Join Date: Jun 2006
Location: 8I3
Posts: 3,562
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I can measure the lift on one of my engines with a dial indicator however I have custom roller rockers with special pushrods so I could get the most lift possible.
__________________
Please don't PM me! Email only!
Bob Japundza CFI A&PIA
N9187P PA-24-260B Comanche, flying
N678X F1 Rocket, under const.
N244BJ RV-6 "victim of SNF tornado" 1200+ hrs, rebuilding
N8155F C150 flying
N7925P PA-24-250 Comanche, restoring
Not a thing I own is stock.
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04-06-2013, 08:51 AM
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Join Date: Dec 2009
Location: Bismarck, ND
Posts: 212
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valve lift
Hi Bob,
since you have the rocker rollers, did you also get your cylinders flowed?
Once I get my flowbench up and calibrated, I would like some comparisons.
When I put my A1B6 together I smoothed out the small radius on the floor of the intake port and smoothed out the valve guide boss, but used the TLAR (that looks about right) method. As it turns out, the cylinders seem fairly well matched on the engine, but I sure would like to have flow measurements and standards for those measurements.
Larry
__________________
Larry Buller
RV7A slow build, Tip up, IO360 200hp, Catto 3 blade, Dynon Skyview, arinc 429, ems, SV transponder, Garmin GNS430w, Aera 560, Dynon D6.
FLYING!
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