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RCV Engines

Old 02-16-2008, 02:36 AM
  #226  
saramos
 
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Default RE: RCV Engines

I think that there are a number of factors to consider. The size and shape of the cowl, the type of plane, sport or scale, and the type of flying would be the most likely contributors.

For me, the two biggest things the SP has for it is the narrow profile, and the large prop. These are important for a scale subject.
For a sport plane, the CD with it's low head and conventional prop size/rpm would probably be the better choice.

Scott


Old 02-16-2008, 10:10 AM
  #227  
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Default RE: RCV Engines

Can you run wooden props on the SP series? Seems like I heard they need the mass of a composite prop. I'd like to be able to do WWI with near-scale props, but they would have to be wood.

Thanks in advance,

Jim
Old 06-14-2012, 08:59 PM
  #228  
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Default RE: RCV Engines

I had bought an RCV 58 CD, few years back direct from RCV and it was stored preserved with oil. Recently I started to run it in before mounting it on a model. The model was stored with 2stroke engine oil (as recommended by Laser Engines and flushed off before being run in). The engine starts fine.
I am using 18% all synth (Klotz) and 5% nitro fuel. Running in is on a 12x6 APC prop
Even while running in the engine at recommended 6000 RPM the bottom of the case gets very hot, so much so that you can not put your finger on it. My experience with other engines has been that if the engine is running well the case bottom remains cool where you can keep your finger (only after shutting the engine down does the case bottom temp goes up).
The question for all RCV owners/runners is this normal with RCV? I have about 45 minutes of run time on the engine now and entire running was below 6000 RPM
Appreciate any help or pointers
Old 06-15-2012, 07:36 AM
  #229  
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Default RE: RCV Engines

I have two 58CD engines, but honestly, I do not remember ever touching the bottom of the crankcase to see how hot it is.
As long as the engines ran OK, I never worried about it.  I normally don't go touching the hot engine to see how hot it is. If I do want to know I use a infrared digital thermometer.
Old 06-15-2012, 08:52 AM
  #230  
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Default RE: RCV Engines

I can't comment for sure on the 58CD, however, I have been running the 91CD for about 3-4 years now, and it runs a bit on the Hot side, not as Hot as reported with the 'RCV SP Series Engines'; other than that, my engine runs well, I don't think it puts out the power that other normal 91 size 4 Strokes do such as the OS-90.
Old 09-04-2013, 09:40 AM
  #231  
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Hello,
on the SP series engines, due to a 2:1 gear, do I need to add more angle on right to compense the high torque ?
Thanks !
Pascal
Old 09-04-2013, 10:25 AM
  #232  
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Originally Posted by Apache06
Hello,
on the SP series engines, due to a 2:1 gear, do I need to add more angle on right to compense the high torque ?
Thanks !
Pascal
I did not add any more right thrust than what the model called for. 2deg Rt thrust on my TF 60 size Corsair.

Pete
Old 07-16-2020, 11:57 AM
  #233  
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Resurrecting an old thread on hope of some answer. I had purchased a 58 CD way back. It was run a few tanks on bench and then went into storage and that too without proper lube up. Recent too out and realised the bearings were all notchy. So changed all the bearings. However on assembly I notice (and hear) a very distinct gear noise. I don't recall this noise in the engine before. I also checked my NIB 91CD and do not hear the noise..
Should I run the engine as is? Or is there something not matching up that needs correction?
Old 07-16-2020, 12:42 PM
  #234  
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I am currently resurrecting a couple of old CD58’s after a few years of neglect.
They all have quite a few hours on them and the gear noise is very evident.
In particular if turning over by hand there is a spot in the cycle, I am thinking the driven 1/4, where the gear noise is loudest.
Considering the abuse I have put these motors through they just keep on keeping on.
Old 07-16-2020, 12:56 PM
  #235  
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mch...All I can tell you about gear noise, on my 60 SP, is that after about 8 or 10 flights I suddenly noticed it was making less noise. Apparently it takes awhile for the gears to get broken in. No idea how this might apply to your re-aasembled 58 CD. I'm surprised you don't hear gear noise on your 91 CD.
Old 07-17-2020, 02:11 AM
  #236  
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Thank you both. I will run the engine and report back 👍
Old 09-06-2020, 12:24 PM
  #237  
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Hello! again, I am writing to update on the 58 CD that you good folks helped me with.
Ran the engine on the test bench, since the gear noise was a concern, squirted a good amount of light oil through the breather and also some through the exhaust port to ensure that the parts had some lubrication on first start.
The engine was mounted on the test bench, a Graupner 12x5 prop, tank filled with my standard brew of 16% synthetic and 5% Nitro and an oldish OS F plug installed.
Engine was given good whirl with an electric starter to expel any excess light oil in the case, tank was connected to the carb, glow plug lit and the engine soon came to life (needles needed correct opening). The engine was run on varying slightly rich setting in 5 minutes spells till the tank was emptied. During the second tank run, slightly more aggressive leaning of the needle was attempted and the engine run for the same 5 minute spells. During one such peaked needle setting tach showed 10400 on the prop. That put a big smile on my face.
Subsequently,yesterday the engine was run for two more tanks using an APC 12x6 and the tach recorded a steady 9200.

Happy with the engine. The engine due to it's design does get hotter compared to conventional four strokes. With that in mind it will go side mounted on a Goldberg Anniversary Cub that is in the process of refurbishing. That way the engine will have adequate cooling and will have more than enough power for the model.
Old 09-07-2023, 04:51 AM
  #238  
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Waking the dead. I have a opportunity to get 2 RCV 60 SP that have been ran and owner says they are locked. I search and have only seen two sold in the US in the last year. They sold new for under $200($195 and $125). I have had locked engines before 2c/4c and was able to work through the locked issues. A few questions

- What prices should I be looking at for a used/locked 60 SP, no good examples with the rare type engine?
- Any major concerns with an SP being locked that are different than your normal 2c/4c?
Old 09-07-2023, 06:22 AM
  #239  
1200SportsterRider
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Watch the lube content, 16% is recommended, I owned a 90SP and a 58CD, 18% was too much and the vent outflow was a constant flow. Mine, (the 58) turned a 13x6 at 9,000 even. I got rid of the 90 SP fairly quickly.
Old 09-07-2023, 11:08 AM
  #240  
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My friend bought a 90 for a Kazmirski Taurus and, while it ran OK, he was not satisfied with the power. It didn't quite measure up to what a 'normal' .91 could put out for power.

You might ask your friend about that...

Just my $02

Bob
Old 09-07-2023, 11:49 AM
  #241  
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Thanks, I have a 90 SP looking to put in a P-39. I will keep that in mind.
Old 09-07-2023, 11:50 AM
  #242  
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Originally Posted by 1200SportsterRider
Watch the lube content, 16% is recommended, I owned a 90SP and a 58CD, 18% was too much and the vent outflow was a constant flow. Mine, (the 58) turned a 13x6 at 9,000 even. I got rid of the 90 SP fairly quickly.
Thanks, I have a 90 SP looking to put in a P-39. I will keep that in mind.

Originally Posted by N1EDM
My friend bought a 90 for a Kazmirski Taurus and, while it ran OK, he was not satisfied with the power. It didn't quite measure up to what a 'normal' .91 could put out for power.

You might ask your friend about that...

Just my $02

Bob
It is currently paired with a TF DC3. I heard a OS or Saito 40 4s can pull it along good and scale. So figured the 60 SP would be up to the challenge. Will ask him though.
Old 09-07-2023, 04:16 PM
  #243  
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Originally Posted by rowdog_14
Waking the dead. I have a opportunity to get 2 RCV 60 SP that have been ran and owner says they are locked. I search and have only seen two sold in the US in the last year. They sold new for under $200($195 and $125). I have had locked engines before 2c/4c and was able to work through the locked issues. A few questions

- What prices should I be looking at for a used/locked 60 SP, no good examples with the rare type engine?
- Any major concerns with an SP being locked that are different than your normal 2c/4c?
The SP engines are 4 stroke and operate quite differently than other engines. To start, they use a rotary valve system. They are geared 2:1. The valves and prop shaft is attached to the top of the cylinder sleeve. The cylinder sleeve rotates around as the piston goes back and forth. The crank shaft and cylinder are connected via beveled gears. They do require good lubrication. I have both a SP and a CD (the CD is geared 1:1). I have no experience with a seized SP engine. I am not sure if parts are available. RCV, the last time I looked, has stopped producing the SP and CD engines and now concentrate on more military and commercial products.

Scott
Old 09-07-2023, 06:25 PM
  #244  
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Ok thanks, did not mention but I do have a 90 SP.
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Old 09-07-2023, 06:45 PM
  #245  
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Rowdog, the SP won't be very difficult to disassemble and check. My hunch is that it is frozen with congealed oil and worst case knackered bearings. Replacing bearings should not be a problem. Similarly, after market piston ring and gaskets should also be available.
If it was me, I would get them at a favorable price and work on them
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Old 10-14-2023, 01:23 PM
  #246  
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Originally Posted by mchandrayan
Rowdog, the SP won't be very difficult to disassemble and check. My hunch is that it is frozen with congealed oil and worst case knackered bearings. Replacing bearings should not be a problem. Similarly, after market piston ring and gaskets should also be available.
If it was me, I would get them at a favorable price and work on them
Thanks, what I was thinking.
Old 10-14-2023, 01:33 PM
  #247  
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So picked up a 60SP to go into my DC3 but the mount is different that the other 60SP engine. Mine only has three mount points vs the four mount points similar to the 60,90 and 120 I am finding online. Did RCV make an earlier version? I am not finding any details.
Old 11-06-2023, 04:30 PM
  #248  
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Here are my 90sp(far left), 60sp(middle), 60sp(far right). You can see the 60sp units have different mounting plates and the 60sp on the right seems a little smaller. Looks like RCV made a V1 60SP model…?


Old 11-06-2023, 09:36 PM
  #249  
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Those SP models --actually, all the RCV engines-- sure are interesting! I'm sort of an engine nut and I bought a 91CD many years ago when I saw them at an R/C show. I ran it on the test stand and broke it in but never ended up mounting it in an airplane. It was a little bit lower on power than my Saito .91 but I didn't buy it based on power. Someday...
Old 11-07-2023, 03:09 AM
  #250  
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Originally Posted by desmobob900ss
Those SP models --actually, all the RCV engines-- sure are interesting! I'm sort of an engine nut and I bought a 91CD many years ago when I saw them at an R/C show. I ran it on the test stand and broke it in but never ended up mounting it in an airplane. It was a little bit lower on power than my Saito .91 but I didn't buy it based on power. Someday...
Thanks for your details, yes interesting engines. I know this is an old thread but hopefully someone may know the details to my questions.

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