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RCV 91-CD Crankcase Breather Reservoir

Old 07-13-2009, 12:34 AM
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Flight 21
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Default RCV 91-CD Crankcase Breather Reservoir

Hello RCV Friends,

A while back I had seen a thread where someone had created a crankcase breather reservoir to hold the overflow of oil during flights. They used a control line fuel tank about 1 oz. in size mounted to the firewall. They ran the the breather tube to one inlet and then had another tube coming from the outlet and venting to the air. The tank was a "V" shape and the inlets/outlets were at the top so gravity kept the oil in the bottom of the tank away from the inlets/outlets.

Now, I know that the rule is to keep the breather tube unblocked and as short as possible but would you consider this a safe option to control the oil venting? Also, I thought I also remember their being a tip on the RCV website about connecting the breather tube to a secondary muffler nipple for venting through the muffler. Is that a safe option as well?

Thanks for the input. ...john
Old 07-15-2009, 01:33 PM
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andi3142001
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Default RE: RCV 91-CD Crankcase Breather Reservoir

Hi John,

I use a small tank for the oil exiting the crankcase. Ingoing line stops right after the cap of the tank, the ventilation tube starts in the exact middle of the tank as it is very unlikely that oil collects there for more than a fraction of a second even during aerobatics.
Length of ingoing line is about 4 inches, outgoing line has the same length. The tube is a fuel tube, however a slightly thicker one with more inner diameter than the tube used for the carb.
I empty this tank after each flight, and never had any troubles.
You can connect the crankcase breather with the muffler, did not try that but I guess it will work. In that case there is no need to empty a tank, but more oil will leave the muffler and stick to your plane.

regards
Andi
Old 07-30-2009, 09:52 PM
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Default RE: RCV 91-CD Crankcase Breather Reservoir


ORIGINAL: andi3142001

Hi John,

I use a small tank for the oil exiting the crankcase. Ingoing line stops right after the cap of the tank, the ventilation tube starts in the exact middle of the tank as it is very unlikely that oil collects there for more than a fraction of a second even during aerobatics.
Length of ingoing line is about 4 inches, outgoing line has the same length. The tube is a fuel tube, however a slightly thicker one with more inner diameter than the tube used for the carb.
I empty this tank after each flight, and never had any troubles.
You can connect the crankcase breather with the muffler, did not try that but I guess it will work. In that case there is no need to empty a tank, but more oil will leave the muffler and stick to your plane.

regards
Andi
Thanks Andi. Yes I will do a similar set-up. Do happen to have any pics you can post of your set-up? Thanks again for the input...
Old 07-30-2009, 10:24 PM
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Default RE: RCV 91-CD Crankcase Breather Reservoir

Pics of my tank set up. RCV 91cd H9 spit Kelo exhaust.

Grinder.
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Old 07-30-2009, 11:45 PM
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Default RE: RCV 91-CD Crankcase Breather Reservoir

awesome! thanks for the great pics. where did you get your reservoir tank? nice exhaust too - about how much did that set you back?
Old 07-31-2009, 05:49 AM
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Default RE: RCV 91-CD Crankcase Breather Reservoir

Here are some Photos of my set up on H9 60 Size P-47, and the control line fuel tanks are not expensive and are available from Brodak Control Line Supplies, here is a link to their Fuel Tanks http://www.brodak.com/shop.php?CategoryID=47
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Old 08-02-2009, 12:20 AM
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Default RE: RCV 91-CD Crankcase Breather Reservoir


ORIGINAL: Flight 21

awesome! thanks for the great pics. where did you get your reservoir tank? nice exhaust too - about how much did that set you back?
I believe it was Dasintex's idea way back when. The tank is from Brodak. The exhaust is from http://www.keleo-creations.com/ and worth every penny of it.

Grinder.
Old 08-03-2009, 11:44 AM
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Default RE: RCV 91-CD Crankcase Breather Reservoir

Thanks Dasintex. Now I remember it was your P-47 where I first saw the idea. Great looking set-up! What do you use to suck out the oil between flights? What size tank are you using? I was thinking about the 2/3 oz. or maybe a 1 oz.
Old 08-03-2009, 12:24 PM
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Default RE: RCV 91-CD Crankcase Breather Reservoir

I can't remember what size of tank I have, probably no bigger than 1oz; also; after each flight I use a 10cc Syringe (what they call a 'Cath Tip Syringe'; like the ones they use to give liquid oral medications to infants and pets) to extract the Oil; the extraction tube exits through the bottom of the Cowl through a Fuel Dot and plugged during flights.
Old 08-12-2009, 11:51 PM
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Default RE: RCV 91-CD Crankcase Breather Reservoir

Okay thanks again Dasintex. I will post pictures of my set-up when I get done. Such a great idea - and I'll bet it hardly leaves any oil on the fuse after flights...
Old 08-13-2009, 05:24 AM
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Default RE: RCV 91-CD Crankcase Breather Reservoir

Not a spot of oil on the Fuselage, a little bit of exhaust grime, thats about it.

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