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  #11  
Old 09-08-2022, 09:20 PM
gasman gasman is offline
 
Join Date: Mar 2007
Location: Sonoma County
Posts: 4,615
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If what you want is performance, then go O360 and CS prop. If you are going from a spam can, then you will be pleased. Just don't ever fly an RV with a O320 and fixed pitch prop because handling will suffer with a nose heavy RV. If you are happy with it, go for it.

Many people just want to get from point A to point B. Others (like me) fly an RV for the amazing feel of the aircraft...... your choice
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  #12  
Old 09-09-2022, 08:36 AM
lr172 lr172 is online now
 
Join Date: Oct 2013
Location: Schaumburg, IL
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Quote:
Originally Posted by Koelemon68 View Post
I have updated the information with more detail:

I have a RV7 I purchased that has a O-320 (160 HP) engine with a fixed pitch propeller. Not sure of pitch or type of propeller. I am unable to put a constant speed propeller on it that I know of. It runs great and I am enjoying the 150 Knots of GS but it can very slow on take off in the summer with fuel and a second person on board. Based in DFW area. I've talked with most others who at least have a O-360 (180 HP constant speed prop) engine on their 7's. So I am considering a change in the future to:
.
[/quote]

I have a 6A with an IO-320 and Catto FP prop. I cruise at 160 KTAS LOP @ 8.1 GPH @ 8K. My T/O rolls are pretty short and would never be afraid of a 2000' runway. It is quite possible you just have a poor performing prop or it is not the correct pitch. I wouldn't condemn the engine before exploring other potential reasons for the under performance.

If I had to deal with 10K DA's all the time, I would probably upgrade my engine or prop, but down here near SL, I am very happy with the lower cost alternatives that I selected.

Larry
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  #13  
Old 09-09-2022, 11:08 AM
Robert Sailor Robert Sailor is offline
 
Join Date: Nov 2018
Location: Nanaimo BC Canada
Posts: 174
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Flying a 6A with an IO-320 and constant speed. Love this combo, great performance in takeoff, climb and cruise. We live on the wet coast so mountain flying…high elevations are normal. We get an honest 165 knots cruise between 9500-12,500.
It costs so much to be fooling around with engines id be super reluctant to even consider it because I’m so happy with what we’ve got. As others have suggested, consider repitching the prop or see if you can get an electric constant speed prop.

I run with RV’s that have 180 hp and there is little to no difference in performance. If they are fixed pitch I usually outperform them right across the board, if they are constant speed some cruise a few knots faster, others not so much.
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  #14  
Old 09-09-2022, 11:39 AM
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Roadjunkie1 Roadjunkie1 is offline
 
Join Date: Jun 2017
Location: Erie, Colorado
Posts: 342
Default Engine swap.....or not......

Quote:
Originally Posted by gasman View Post
Just don't ever fly an RV with a O320 and fixed pitch prop because handling will suffer with a nose heavy RV. If you are happy with it, go for it.
Many people just want to get from point A to point B. Others (like me) fly an RV for the amazing feel of the aircraft...... your choice
+1

SuzieQ has an O-320 with a (BEAUTiful) Warnke "Almost Constant Speed" wooden prop, sadly no longer available. Somehow, it seems to bite into the air better as speed increases. I do have the Landoll Harmonic Balancer (would not trade it for it's weight in gold) and love the performance and handling. Field elevation here is 5,200 feet.

What Gasman was saying that if you ever fly an RV that is as light as possible, making it more nimble, you will not want anything else. Van himself has said as much.....

SuzieQ does very well cross-country (152kts at economy cruise with the old-style wheel pants....those are probably going to be upgraded....) which is WAY faster than many other airplanes I've flown. I can keep up with everyone I have flown with....and love sneaking up on Bonanzas or Mooneys...... She can top 174kts (200 mph!) but is sucking 10 gph to get there. Naaaaa; I'm good! I like 6.5-7gph..... Her handling, like Gasman says, is beyond amazing! I'm with him there!

I LOVE my RV-4 just the way she is......(do I hear a Billy Joel song in the background.....)
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RV-4 2860 SuzieQ
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Last edited by Roadjunkie1 : 09-09-2022 at 03:58 PM. Reason: Changing kts to mph
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  #15  
Old 09-09-2022, 02:06 PM
JDeanda JDeanda is offline
 
Join Date: Apr 2013
Location: Ventura, CA
Posts: 363
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Our RV-6 has an O-320-D1A, 160 hp, a Slick mag and a Lightspeed Plasma III. We have a Catto FP and cruise around 155 knots or so, burning just under 8 gph. The lightweight Catto along with a lightweight starter condemns me to always looking for ways to get weight off the tail, but the airplane handles beautifully. A friend had the same engine in his -6 with a Hartzell constant speed prop and the acceleration on takeoff was of course dramatically better than our airplane. The -6 across from our hangar has an IO-360 with a Hartzell blended airfoil constant speed. It does not really have a takeoff roll, just leaps into the air like a sparrow. Cruises right at 180 kts. I don’t know what his fuel burn is and the handling is more towards the stable, big airplane feel. You take your choice and then pay your $. Side note, we had a Warnke 72-60 on our airplane originally but I believe it was for a 150 hp airplane. Says so, right on it. I damaged it taxiing into a plastic stanchion. The Catto was a huge improvement. If you’re going to stay with the simplicity and economy of a FP, I believe Catto is the gold standard. If there’s a square pad on front or back of your engine, you can probably hand a CS prop on your engine. You’ll also need to pull the plug out on the front end of the crankshaft.
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  #16  
Old 09-09-2022, 03:41 PM
Taltruda Taltruda is offline
 
Join Date: Oct 2017
Location: Las Vegas, NV
Posts: 1,377
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Quote:
Originally Posted by Roadjunkie1 View Post
+1

SuzieQ has an O-320 with a (BEAUTiful) Warnke "Almost Constant Speed" wooden prop, sadly no longer available. Somehow, it seems to bite into the air better as speed increases. I do have the Landoll Harmonic Balancer (would not trade it for it's weight in gold) and love the performance and handling. Field elevation here is 5,200 feet.

What Gasman was saying that if you ever fly an RV that is as light as possible, making it more nimble, you will not want anything else. Van himself has said as much.....

SuzieQ does very well cross-country (152kts at economy cruise with the old-style wheel pants....those are probably going to be upgraded....) which is WAY faster than many other airplanes I've flown. I can keep up with everyone I have flown with....and love sneaking up on Bonanzas or Mooneys...... She can top 200kts but is sucking 10 gph to get there. Naaaaa; I'm good! I like 6.5-7gph..... Her handling, like Gasman says, is beyond amazing! I'm with him there!

I LOVE my RV-4 just the way she is......(do I hear a Billy Joel song in the background.....)
You have a -4 with an O-320 that can do 200 knots? VNE is 182 knots true..
I agree that a 320 engine/wood prop combo is a sweet flying plane!! My neighbor has that combo, and I love to fly it.. just so sweet. I’m not downgrading my O-360 & metal prop to get there though, but I very much enjoy flying hood when I can!
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  #17  
Old 09-09-2022, 03:56 PM
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Roadjunkie1 Roadjunkie1 is offline
 
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Location: Erie, Colorado
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Quote:
Originally Posted by Taltruda View Post
You have a -4 with an O-320 that can do 200 knots? VNE is 182 knots true..
I agree that a 320 engine/wood prop combo is a sweet flying plane!! My neighbor has that combo, and I love to fly it.. just so sweet. I’m not downgrading my O-360 & metal prop to get there though, but I very much enjoy flying hood when I can!
I lied! Well, I misspoke. I jumped from mph to kts. She'll do over 200 mph or 174 kts. Van's web site brags a 160hp RV-4 with a wood prop will do 205mph. I've seen that but things up front are working REALLY hard....! (I had to go in and edit that post......)
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RV-4 2860 SuzieQ
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Last edited by Roadjunkie1 : 09-09-2022 at 03:59 PM.
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  #18  
Old 09-28-2022, 08:27 AM
Koelemon68 Koelemon68 is offline
 
Join Date: Jun 2021
Location: Haslet, TX
Posts: 16
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Thank you all for the replies as it gives me a lot to think about. After really thinking about it it does not make financial sense to change the whole engine. What we would like to do is get a constant speed prop because when we fly formation, we are starting to do a lot of it, this airplane will not slow down with the fixed pitch prop. My O-320-D2J does have a mount on the case for a governor but will need to find out if it can support a CS prop or not. Are there other options as I have seen electric CS props but have never talked with anyone whom has one.
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  #19  
Old 09-28-2022, 05:29 PM
blaplante blaplante is offline
 
Join Date: Jan 2010
Location: Southern California
Posts: 507
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Quote:
Originally Posted by Koelemon68 View Post
Thank you all for the replies as it gives me a lot to think about. After really thinking about it it does not make financial sense to change the whole engine. What we would like to do is get a constant speed prop because when we fly formation, we are starting to do a lot of it, this airplane will not slow down with the fixed pitch prop. My O-320-D2J does have a mount on the case for a governor but will need to find out if it can support a CS prop or not. Are there other options as I have seen electric CS props but have never talked with anyone whom has one.
Bottom line you need to determine if you have a hollow crank or not. Hollow ... and have a governor pad... you should be able to install a conventional CS prop. Not hard to determine. Pull the prop and have your neighborly A&P look.
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  #20  
Old 09-29-2022, 09:20 AM
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Low Pass Low Pass is offline
 
Join Date: May 2006
Location: Texas
Posts: 2,195
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Quote:
Originally Posted by Koelemon68 View Post
Thank you all for the replies as it gives me a lot to think about. After really thinking about it it does not make financial sense to change the whole engine. What we would like to do is get a constant speed prop because when we fly formation, we are starting to do a lot of it, this airplane will not slow down with the fixed pitch prop. My O-320-D2J does have a mount on the case for a governor but will need to find out if it can support a CS prop or not. Are there other options as I have seen electric CS props but have never talked with anyone whom has one.
One day you may have to change, then think about changing. I flew around behind a -320 CS (Whirlwind) in my -8 for quite a while. My *good* friends always waited on me. But the reality was, as already mentioned, I had less climb, a few less knots on the top end, and far better cooling as compared to the guys with the -360 parallel valve. After 8-10 years, my case eventually developed a crack, and I changed to a -360 parallel valve engine. And the climb outs are noticeably improved.
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Last edited by Low Pass : 09-29-2022 at 09:25 AM.
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