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RCVsa120

Old 12-01-2008, 03:22 PM
  #1  
Sparkey
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Default RCVsa120

Hello
> I have a RCV sp120 .
> I bought it at a sale and just know trying it after two years .I got it to
> hand start and run. But the problem is top RPM is about 4500 Max.This
> engine has never seen a plane but it has run before .
> Could you advise on uping the RPM other than leaning out the engine as I
> did thatr for a couple of seconds with no improvment.
>
> If you are going to advise changing the timming please keep it simple as I
> am an old lover not a mechanicLOL
Sparky
Old 12-01-2008, 07:14 PM
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mboland
 
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Default RE: RCVsa120

The great determiner of rpm is not just the motor but what it is driving and what with.
You have given no details of the prop or fuel you are using.

How much has this engine run and how long have YOU run it?

Are you measuring prop rpm or crank rpm?

The run in instructions are quite specific for these engines and need to be followed. It takes a loooonnnggg time to bed them in.
Fuel is also quite important to get them running right. RCV state no more than 16% oil, although they have changed their opinion on the oil types, all synthetic now apparently is OK.

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Old 12-01-2008, 07:30 PM
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Sparkey
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Default RE: RCVsa120

You are right I should have added
10 % coo0lpower
20x12 prop
Engine run maybe 5 times
Prop rpm with digital readout

Is 4500 rpm expected at this stage.
Old 12-01-2008, 07:56 PM
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mboland
 
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Default RE: RCVsa120

The rpm is definitely low, you should be able t o peak the motor to 5.5K, but only after run in.

If the engine has only run 5 times then it hasn't even started to free up.

Most reports are that at least a gallon or two is required before you will get it to loosen up and get that 5K to 5.5K top end.

Be aware that they also peak out at less than full throttle and then tend to bog down when opened out further.

I have seen a recipe for the run in that calls for a tank of fuel at 3K, then a tank at 3.5K, then another tank at 4K, and so on.

How is the vibration level?
Has it blown the end off the muffler yet?

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