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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Engine Manufacturers Direct Support Forum >> RCV Engines Support >> Twin rcv's one runs one don't
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Twin rcv's one runs one don't - 6/13/2003 6:54:04 AM   
venture32os


 

Posts: 180
Joined: 6/9/2002
From: St. Cloud, FL, USA
Status: offline 		I have a pair of rcv 60's on my p82 mustang. I have one mounted with carb up. It runs great,easy to start. The other is mounted carb down. It is very hard to start, when it does it will not idle. Seems to flood out. Please help.


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ergo ys61st2
550gyro
       Post #: 1

Re: Twin rcv's one runs one don't - 6/13/2003 7:35:41 AM   
David Cutler



Posts: 2163
Joined: 9/13/2002
From: Los Angeles, CA, USA
Status: offline 		[QUOTE]Originally posted by venture32os
I have a pair of rcv 60's on my p82 mustang. I have one mounted with carb up. It runs great,easy to start. The other is mounted carb down. It is very hard to start, when it does it will not idle. Seems to flood out. Please help. [/QUOTE]

I have a 60 as well.

Would it help to turn the whole cylinder / shaft round through 180 degrees? I believe it's possible to do this.

If you haven't got the instruction booklet for this, please come back and I will quote from it for you. It has comments about what to do about the timing etc.

hope that helps!

-David C.

(in reply to venture32os)
       Post #: 2

Twin rcv's one runs one don't - 6/13/2003 9:12:51 AM   
Otto Kudrna



Posts: 373
Joined: 2/19/2002
From: Burr Ridge, IL, USA
Status: offline 		Venture
I know what you are doing, You are trying to get the exhausts to the outboard of the fuselages. The engine with the carb down is probably not timed right. Because of the gear tooth count, it is impossible to time the engines identically with the cylinders in different positions. You should just place the stacks to the bottom (for which the timing was designed) and eliminate a lot of problems.

Otto Kudrna

(in reply to venture32os)
       Post #: 3

I did retime them - 6/13/2003 4:24:52 PM   
venture32os


 

Posts: 180
Joined: 6/9/2002
From: St. Cloud, FL, USA
Status: offline 		I set the engines up so the start shafts would be outboard of each fuse and the exhuast would be the same. The one runs very well. Can rotate them again to get the exhaust out the bottom and the start shaft out the side without having to move the mounting holes? Thank you


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ergo ys61st2
550gyro

(in reply to venture32os)
       Post #: 4

Twin rcv's one runs one don't - 6/14/2003 2:06:02 AM   
Otto Kudrna



Posts: 373
Joined: 2/19/2002
From: Burr Ridge, IL, USA
Status: offline 		Just make sure that they are timed the same. This is critical.

Otto

(in reply to venture32os)
       Post #: 5

Timing - 6/14/2003 10:36:47 PM   
venture32os


 

Posts: 180
Joined: 6/9/2002
From: St. Cloud, FL, USA
Status: offline 		Will the timing be ok if the start shaft point in opposite directions?
Please help getting really frustrated have had engines for 2 months and havent gotten to fly them yet.


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ergo ys61st2
550gyro

(in reply to venture32os)
       Post #: 6

Re: Timing - 6/14/2003 10:49:11 PM   
David Cutler



Posts: 2163
Joined: 9/13/2002
From: Los Angeles, CA, USA
Status: offline 		[QUOTE]Originally posted by venture32os
Will the timing be ok if the start shaft point in opposite directions?
Please help getting really frustrated have had engines for 2 months and havent gotten to fly them yet. [/QUOTE]

The engine can be timed correctly in any of the four positions allowed by the crankcase / cylinder mounting lugs.

Extract from the manual:-

Reassembly of the engine is a simple operation. The main difficulty is in ensuring that the gears are engaged in the correct position so that the engine is timed correctly. ABOVE ALL THE TIMING MUST BE CHECKED CAREFULLY BEFORE BOLTING THE CARB AND EXHAUST BACK ONTO THE ENGINE.

The engine is timed at top dead centre between the inlet and exhaust stroke. At this point in the cycle the cylinder port is exactly halfway between the exhaust and inlet. If the engine is assembled so that the piston is at top dead centre when the cylinder port is halfway between the exhaust and inlet,
then it is timed correctly.

Insert a 5mm Allen key in the starter drive Allen screw. Turn the crank to top dead centre. Carefully note the angle the Allen key assumes when at top dead centre, and as an additional check mark the top of the starter drive Allen screw to mark the position of top dead centre.

Take the cylinder jacket and rotate the cylinder until the cylinder port is equally visible in the exhaust and inlet ports. About 1/8 of the port should be visible in each. This will require a bright light shining directly down the inlet or exhaust port to be sure of the position of the port. Now insert two cocktail sticks (or similar suitable wooden or plastic implements) into the exposed segments of the port to lock the cylinder in position. Finally, holding both components in these positions, bring them together carefully with the four boltholes lined up.


-David C

(in reply to venture32os)
       Post #: 7

Twin rcv's one runs one don't - 6/15/2003 10:29:05 PM   
David Cutler



Posts: 2163
Joined: 9/13/2002
From: Los Angeles, CA, USA
Status: offline 		[QUOTE]Originally posted by Otto Kudrna
Because of the gear tooth count, it is impossible to time the engines identically with the cylinders in different positions. [/QUOTE]

Could you expand on this please? The manual says you can time it right in any position, doesn't it?

-David C.

(in reply to venture32os)
       Post #: 8

Twin rcv's one runs one don't - 6/17/2003 10:40:18 AM   
Otto Kudrna



Posts: 373
Joined: 2/19/2002
From: Burr Ridge, IL, USA
Status: offline 		David

I never said the engine will not run, or even run well, it just will not run perfectly. It is simple math, The gears must be exactly 2:1, If the little one has 10 teeth the other has to have 20. Now if the timing key on the little gear is on a tooth, which it is. The matching lock on the large gear must be in a valley. This now leaves a odd number of wallies. which are 19 in count. This number is not divisible by 4. You will now always be at least 1/2 tooth off in either advanced or retarded in the other 3 positions, this can be as much a 6*. We are only talking a few hundred RPM, which will not matter on a single engine airplane but will make a large difference in a multi. If one chooses to go advanced, the engine will have less torque to turn a large prop, but will be capable of higher revs with a smaller prop. If on the other hand one chooses to go retarded, you will have more torque at the lower revs. If an engine is advanced too far, it will be noticed that a large amount of fuel will come from the front bearing. The engine will also spit a lot more fuel from the carburetor at full throttle.

Otto Kudrna RCV Tech Support

(in reply to venture32os)
       Post #: 9

Repair them - 6/18/2003 4:23:50 AM   
venture32os


 

Posts: 180
Joined: 6/9/2002
From: St. Cloud, FL, USA
Status: offline 		If I ship them to you. What will you charge to set them right? I want the start shafts opposed and the exhaust down on both.


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ergo ys61st2
550gyro

(in reply to venture32os)
       Post #: 10

RCV 60's Timing - 7/12/2003 4:05:05 AM   
venture32os


 

Posts: 180
Joined: 6/9/2002
From: St. Cloud, FL, USA
Status: offline 		I reset the timing on both engine's. They seem to run very good.
Before I set the timing they seemed to run good up to half throttle, but then died off as if they were running lean. Know after working on them they run very strong. My 120 seems to run as they did before, I was wondering if the timing could be off from the factory as I have nver had this one apart before?


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ergo ys61st2
550gyro

(in reply to venture32os)
       Post #: 11

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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Engine Manufacturers Direct Support Forum >> RCV Engines Support >> Twin rcv's one runs one don't
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