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  #1  
Old 02-11-2014, 07:14 PM
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Jesse Jesse is offline
 
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Location: X35 - Ocala, FL
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Default Engine swap from 320 to 360

I am thinking of pulling the 320 out of our -6A and putting in the 360 that is listed in the classifieds section. Should it be a drop-in replacement? I understand CG issues, but the engines should be the same size from engine mount to prop flange, right? Has anybody done this that would be interested in sharing their experiences?
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Old 02-11-2014, 07:52 PM
Sig600 Sig600 is offline
 
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PM me, we'll make that 6a of yours a screamer!

http://www.eaa902.org/Lycoming_Engines.pdf

I would say it should be close. Your bigger challenge will probably be the baffling (which I have with the engine I'm selling).
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Last edited by Sig600 : 02-11-2014 at 07:56 PM.
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  #3  
Old 02-11-2014, 08:11 PM
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rvbuilder2002 rvbuilder2002 is offline
 
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An O-360 is one inch wider. The baffling will have to be redone.
The exhaust system will be 1 " too narrow.
The induction scoop on the bottom cowl is not deep enough for the taller MA5 carb, and the FAB air box from the O-320 wont work on the O-360 That's assuming both engines are carbureted).
You would also need a different prop (don't know if the engine you are looking at comes with one).
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  #4  
Old 02-11-2014, 09:32 PM
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Ok, the exhaust will have to be changed. Can the baffles be modified? The 360 will be injected. The 320 is carbureted. Will the cowl fit? I don't mind doing a new fab.
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Old 02-11-2014, 09:51 PM
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rvbuilder2002 rvbuilder2002 is offline
 
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Quote:
Originally Posted by Jesse View Post
Ok, the exhaust will have to be changed. Can the baffles be modified? The 360 will be injected. The 320 is carbureted. Will the cowl fit? I don't mind doing a new fab.
The baffles could be modified... would require adding 1/2 inch to each inlet ramp and 1/2 inch to each aft portion behind the cyls.

As for cowl.. that one is a little tougher to answer.... I think all of the injection servos are the same height as an MA5 carb so the inlet scoop would be wrong, but I am not absolutely sure on that one. You could have the seller measure the servo from bottom flange to top flange and compare that to your MA4SPA carb. If they are close to teh same, you might be able to make it work.
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  #6  
Old 02-12-2014, 03:14 AM
flyer174 flyer174 is offline
 
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If you are going to fuel injection you will have to add a high pressure boost pump in the cabin floor also...
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  #7  
Old 02-12-2014, 06:25 AM
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If you are going to fuel injection you will have to add a high pressure boost pump in the cabin floor also...
I already have a high pressure pump on the shelf, so that isn't a problem.
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  #8  
Old 02-12-2014, 07:27 AM
Speedy1 Speedy1 is offline
 
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Jesse,

I recently upgraded the engine in my RV-6 from an Aero Sport Power IO-320-D1A to an ECI Titan IOX-370 (essentially a stroked 360 that makes 205 HP!) and it was not a difficult job.

The distance from engine mount to prop flange does not change, so there is no issue with spinner clearance. As mentioned in previous posts, the baffles will have to be widened or replaced. My -6 had almost 2000 hours on it and the baffles were getting a bit raggedy, so I replaced them. I finished the airplane in 2002 and at the time the baffles were a frustrating puzzle, but the current baffle kit from Van's is much better.

You will need the high pressure fuel pumps (electric boost and mechanical engine driven) and don't forget the fuel pressure gauge, too. 5 psi for carb, but 30 psi for fuel injection.

I was able to reuse the throttle and mixture control cables without modification, but I did have to rotate the control arms on the fuel servo to get the correct motion (push for full throttle and full rich). I'm not sure how they are arranged on the carburetor but that's something to look at and plan for.

The exhaust system crossover tubes will need to be longer for the wider 360, but I had a local auto exhaust shop make a couple of short extension pieces which just slipped on and I reused my existing Vetterman exhaust. Easy, quick, and most important, cheap!

Intake scoop clearance is the one place where you may have an issue. When I built mine, you had to choose a scoop size and glass it onto the lower cowl. I originally had a Bendix fuel injection servo on the 320 which was taller than a carb so I used the 360 scoop which also fit for the engine swap . If you have glassed-in 320 scoop the fuel injection will not fit, otherwise you should be OK.

Your old prop will not fit the new engine. Flange bolts on the 320 are 7/16" and the 360 uses 1/2".

Weight and balance will not be an issue, and the slightly forward CG change is actually a good thing. (less pitch sensitivity with full load)

I absolutely love the performance of my -6 with the new engine, and I would be happy to answer any other questions you have. If you want to talk, my cell # is 864-245-0557.

Danny Kight
RV-6 N722DK
RV-8 N297NW
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  #9  
Old 02-12-2014, 07:10 PM
captainrichhill captainrichhill is offline
 
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Location: jacksonville, fl
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Default Thicker skin tail?

Did you guys have the thicker skins for the tail already? That was an issue that prevents me from researching the HP upgrade in the 6/6A.
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  #10  
Old 02-12-2014, 07:18 PM
Kyle Boatright Kyle Boatright is offline
 
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Quote:
Originally Posted by Jesse View Post
I am thinking of pulling the 320 out of our -6A and putting in the 360 that is listed in the classifieds section. Should it be a drop-in replacement? I understand CG issues, but the engines should be the same size from engine mount to prop flange, right? Has anybody done this that would be interested in sharing their experiences?
Jesse,

Would it make any sense to buy higher compression pistons and flowed cylinders for your -320 and get a HP gain without as much effort?
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