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  #1  
Old 07-02-2016, 02:28 PM
pastranafan5 pastranafan5 is offline
 
Join Date: May 2014
Location: jonesboro, ar
Posts: 63
Default O-320 B3B for RV-7A

I ordered an engine mount and cowling for an O-360 with a constant speed prop. I found an O-320 B3B with constant speed prop. Will this work if I just order a conical mount? Why doesn't Van's want me to use this engine? Any information will be greatly appreciated.
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  #2  
Old 07-02-2016, 03:21 PM
DaveO DaveO is offline
 
Join Date: Dec 2012
Location: Greenfield, IN
Posts: 341
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In my humble opinion the value of the 7 will be higher if you use a 180 horse and CS prop. I built a 7 and would not use a 160 horse for that reason, plus the performance is better.

The 9 most have used a 160 horse. I am interested in a 9 with a CS prop, but very few have been installed. I have seen a 150 horse however on the 9.

You are the builder and it is your choice.
Best to you.
Dave
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  #3  
Old 07-02-2016, 04:58 PM
Zero4Zulu Zero4Zulu is offline
 
Join Date: Nov 2008
Location: Scio,Oregon
Posts: 261
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My RV6A has a O320 B3B. It was flying previously as a stock B3B with the Carburetor in the aft location. The filter air box was pretty hacked up to make it work. During overhaul I changed the sump to the more forward carb. location. Also had a Hartzell prop. but I'm changing to a Cato for lightness and simplicity. Not flying yet...
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  #4  
Old 07-04-2016, 04:34 PM
JimWoo50 JimWoo50 is offline
 
Join Date: Oct 2005
Location: Chicago sw suburbs
Posts: 395
Default I use a 0-320 b3b

350 hrs, fp, chrome cylinders, and it is a conical mount. I am pleased with the 160hp performance in my 6. Why doesn't Van want you to use the engine?
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  #5  
Old 07-05-2016, 10:02 AM
pastranafan5 pastranafan5 is offline
 
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Location: jonesboro, ar
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Quote:
Originally Posted by Zero4Zulu View Post
My RV6A has a O320 B3B. It was flying previously as a stock B3B with the Carburetor in the aft location. The filter air box was pretty hacked up to make it work. During overhaul I changed the sump to the more forward carb. location. Also had a Hartzell prop. but I'm changing to a Cato for lightness and simplicity. Not flying yet...
Do you know what the part number is on that sump, or what it came off of?
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  #6  
Old 07-05-2016, 10:04 AM
pastranafan5 pastranafan5 is offline
 
Join Date: May 2014
Location: jonesboro, ar
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Quote:
Originally Posted by JimWoo50 View Post
350 hrs, fp, chrome cylinders, and it is a conical mount. I am pleased with the 160hp performance in my 6. Why doesn't Van want you to use the engine?
I don't know why they don't want me to use it. He just said they don't recommend that engine for the 7. Maybe vibration?
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  #7  
Old 07-05-2016, 10:22 AM
RV6_flyer's Avatar
RV6_flyer RV6_flyer is offline
 
Join Date: Jan 2005
Location: NC25
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Quote:
Originally Posted by pastranafan5 View Post
I ordered an engine mount and cowling for an O-360 with a constant speed prop. I found an O-320 B3B with constant speed prop. Will this work if I just order a conical mount? Why doesn't Van's want me to use this engine? Any information will be greatly appreciated.
IIRC, the O-320 B series engine has the carb mounted as far back on the oil sump as it can possibly go. This configuration on the oil sump does not work with the -A model RVs because there is not enough room for the FAB. (FAB = Filtered Air Box)

IF you use a B series engine on the nose wheel RVs, the oil sump most likely will need replaced due to interference with the nose gear. Typically it is easier to just let the tail wheel RV guys buy the B series engines so that there is no interference with the little wheel mount plus no need to try and find a sump and swap it.
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  #8  
Old 07-05-2016, 10:28 AM
Zero4Zulu Zero4Zulu is offline
 
Join Date: Nov 2008
Location: Scio,Oregon
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My engine builder had the correct sump. I believe there are many different engine models that have the carb. in the more forward location. The one we used also had larger intake tubes. Maybe they all do... Also there is a small modification that will need to be done to the oil pick up location. Plug one hole with pipe plug and drill the oil passage to go downward. I don't remember the details but a very simple modification.

Also there is a Lycoming insert for the carb. intake bore in the sump so the carb. bore matches the sump. Corrects air flow I guess. I don't have the P/N for it but you can search the forum here. I haven't done this yet but I think it is recommended.
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  #9  
Old 08-04-2016, 07:21 AM
jtppalmer050390 jtppalmer050390 is offline
 
Join Date: Apr 2009
Location: Calhoun, GA
Posts: 49
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I would like to know who told you not to use 0-320. I was told that was a good choice for RV 6 and 7. One of the guys there actually has 0-320 on his personal plane. As far as vibration, the 0-320 seems to me is smoother than the 0-360.

As you probably guessed I have a 7A with 0-320. Have FP wood prop. Very happy with performance. Very smooth. keep in mind that if you go with the 0-320, it does require a different engine mount. I almost made that mistake!!!! The 0-320 engine mount is slightly longer to help with CG.
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  #10  
Old 08-04-2016, 11:33 AM
lr172 lr172 is offline
 
Join Date: Oct 2013
Location: Schaumburg, IL
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I would be pretty certain they didn't endorse it because the B series engines have the rear mounted carb, which is problematic. I used an O-320 B1A. I found a sump with the centered carb on Craigs list and sold my old sump on e-bay for almost the same amount of money. No other issues with that engine.

Larry
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