Does anyone know how different the intake tubes are for an angled valve IO-360 (Lycoming P/N?s 78741, 2, 3, 4) vs the intakes tubes on an IO-360-M1B (Lycoming P/N?s 42E22611, 2, 3, 4 )? I have a B1E (parallel valve / rear facing sump) that I am overhauling and need to convert it for a fwd facing sump for my RV7. I know the angled valves engines and the M1B use the same sump, but I am guessing that if I buy a used sump off an angled valve the tubes will not work on my parallel valve with the same sump. I know I can buy the superior cold air sump with tubes, but am trying to save some money. Thanks.
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360 Intake Tube Compatibility??
- Thread starter mandorfer
- Start date
Larco
Well Known Member
IIRC, If it would help to modify your sump from a rear facing to a front facing, I think this company did the conversion.
http://www.divcoinc.com/
rv7charlie
Well Known Member
It's been a long time since I did the research, but I *think* that the angle valve tubes are about 1/4" 'shorter' where they meet the head to allow for the larger profile of the angle valve heads. Pretty sure I've seen people use a spacer to make up the difference when using angle valve tubes on a parallel valve engine.
If you're interested, I've got a rear-inlet sump that's been converted to forward-facing, for a parallel valve engine, and I'm pretty sure I have the tubes as well. I bought it to convert a rear facing sump engine, but plans changed. I think I paid around $450 for it.
Charlie
edit: Again, IIRC, some of the rear facing sumps ('C' suffix engines?) also have the tube exits from the sump too far aft to clear some RV motor mounts. The one I have has the tubes exiting in the 'typical' location.
If you're interested, I've got a rear-inlet sump that's been converted to forward-facing, for a parallel valve engine, and I'm pretty sure I have the tubes as well. I bought it to convert a rear facing sump engine, but plans changed. I think I paid around $450 for it.
Charlie
edit: Again, IIRC, some of the rear facing sumps ('C' suffix engines?) also have the tube exits from the sump too far aft to clear some RV motor mounts. The one I have has the tubes exiting in the 'typical' location.
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pazmanyflyer
Well Known Member
If you need new intake tubes and want to save a few dollars over Lycoming new, contact Clint at Vetterman. He will custom fab some for you for something like $75 each. Fits right up and no need for spacer. That is what I did going from AV to PV cylinders during my engine rebuild.
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