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RCV-120sp spacer/stand-off

Old 02-10-2009, 01:34 PM
  #1  
ktcanuck
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Default RCV-120sp spacer/stand-off

Hi folks. I am going to put a 120SP into a Top-Flite Bonanza which I was happy to find on eBay recently.

The Bonanza calls for 6 1/4 inches from firewall to spinner back-plate. The 120SP is 125.4mm or 4.94 inches leaving me 1.3+ inches short.

What method is recommended for spacing the engine out? A new engine mount built of ply attached to firewall perhaps? I don't see the firewall handling the torque that regular spacers would apply.

Any suggestions?

Keith
Old 02-10-2009, 01:47 PM
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Default RE: RCV-120sp spacer/stand-off

I'd make a ply or hardwood spacer as you mentioned, then relieve the inside, say with a holesaw to shed unnecessary weight.
Old 02-11-2009, 02:08 PM
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grinder-RCU
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Default RE: RCV-120sp spacer/stand-off

Take the engine to a machine shop and have a spacer made from aluminum. Add a control line tank to catch crankcase oil and drain after each flight. Reinforce the firewall and you'll be good to go.

Grinder.
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Old 02-12-2009, 07:39 AM
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ktcanuck
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Default RE: RCV-120sp spacer/stand-off

Thanks for the comments folks.

Grinder, I saw these pics a while ago and then couldn't find them again. Looks like 2 to 3 hours of machinist work in there?
Old 02-12-2009, 02:50 PM
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Default RE: RCV-120sp spacer/stand-off

Sounds about right. I forget what I paid for the job. Wasn't much. The big problem was finding a machine shop to take on such a small job and then have to wait 3-4 weeks for it. If your stuck I might be able to get one made for you, if you cover the costs. I have mine off my plane at the moment. Mine is for a 90sp so you will need to check the dimensions agaisnt the 120sp.

Grinder.
Old 02-13-2009, 07:31 AM
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Default RE: RCV-120sp spacer/stand-off

Grinder, I will see if I can locate a shop here in Ottawa that will take it on without asking for my first born! I'll hold on to your offer for a while. Many thanks.

Keith

Old 02-13-2009, 10:54 PM
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Default RE: RCV-120sp spacer/stand-off

If I was going to do another one I would make it into a holding tank for the crankcase oil residue instead of having to add another smaller tank. Something to think about. Look up RCU'er " Juice " he made one.

Grinder.
Old 02-14-2009, 07:45 AM
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Default RE: RCV-120sp spacer/stand-off

Good thought. Thanks, I will do that.

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