VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics


Go Back   VAF Forums > Model Specific > RV-8/8A
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
  #11  
Old 12-20-2017, 12:20 PM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is offline
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 1,658
Default Comparing engines

I have a lot of time behind a 180hp IO-360 RV-8A, and recent time flying a fire breathing 220hp RV-8.

Here are my thoughts:
- Both engines have a Hartzell CS prop. The engine choice is secondary to the decision to install the Hartzell BA CS prop. Iíve flown the same RV-8A with a FP and then changed out to the Hartzell - there is no comparison in performance.
- The 180HP IO-360 is more than enough power and provides for 170kt cruise at 7.5 - 8.0 gph - and climbs at 2000+ fpm. This makes for a superb cross country plane.
- The 220hp RV-8 jumps off the runway - I was amazed at how short a run it took compared to the 180hp RV-8A (which is no slouch itself).
- The 220hp RV-8 cruises at 180 kts (2400 rpm at 23Ē MP or so) at 9 gph (there is no free lunch - go faster, use more fuel).
- The 220hp RV-8 is of course heavier. Iíd give the nod to the 180hp RV-8A for the best handling - but they are close.

For the new RV-8 project I got the Vanís show special (IO-360-M1B and Hartzell CS BA prop). This is, in my opinion, the absolute best value option out there.

Decide what you want the plane to do and how thick a wallet you have. Then get what you want.

Carl
Reply With Quote
  #12  
Old 12-20-2017, 05:43 PM
Capt Capt is offline
 
Join Date: Feb 2017
Location: Australia
Posts: 209
Default

That's a great comparison, thanks for that, it's always good to hear actual experiences🙂
Reply With Quote
  #13  
Old 12-21-2017, 07:57 AM
Robert Anglin Robert Anglin is offline
 
Join Date: Mar 2008
Location: houston, texas
Posts: 865
Default To long a list.

As has been said above, you will do well with most of the top four or five you listed. We roll our own, that is to say we buy from a spec. list to get what we want. Most owner-builders will not try to put their engines together, but I feel that it is a good idea for someone that is going to be flying their bag of parts to know as much as they can about those items. It makes it much better to put your mind at ease when you start servicing and trying to figure out problems later on after you start flying. Most of the parts that go into a Lycon are made and supplied by companies that send those parts to the people or company's you have listed. If you have the time and money to go and help put your power plant together, I think you will benefit a lot from that. As to the choice of what engine configuration you need, that one is up to what kind of flying you do and what you want out of your flying. This is just us for this aircraft and no other, but what we did was select an IO-360 with a good no counter weights or "dampers" if you wish. Add all the oil spray nozzles, the EX-ECI cylinders with the high air-flow seats and guides, then add 9:1 pistons. This gave us along with some intake and exhaust port work some 195 or so B.Hp. but kept the weight of the engine as low as we could.
After a good build with a good Prince prop it gave us an aircraft that came in at 1008 Lbs. with a Hp. that was just at are slightly below the "Max." 200 Hp. that Van's had recommended for that airframe. This with a moving of some weight after we weighed it for the first time gave us an aircraft that can carry 792 Lbs. by the book, but more important to us was to be able to load the front baggage compartment to it's full limit, take on full fuel, two 200 Lbs. people and put the 75 Lbs. in the rear baggage compartment and still be under gross weigh by the recommendations from Van's.
It's just all in what you want out of you flying, you can build or have built an engine that weights a little and gives you a lot or you can get one that weighs a bit more and has more pull also. The 8 is a very good platform if you keep it light and well balanced, but you might like more speed dam the torpedoes. Hope this helps, Yours, R.E.A. III # 80888

Last edited by Robert Anglin : 12-23-2017 at 07:45 AM.
Reply With Quote
  #14  
Old 12-21-2017, 06:31 PM
Northernliving Northernliving is offline
 
Join Date: May 2005
Location: Boston, MA
Posts: 123
Default 375

I have a 180hp PV O-360, but when it comes time to replace it, I think I would go with the IO-375 PV 200hp. Light weight, PV, and 200 hp. Sounds like a winner to me.
__________________
Brian J.
Boston, MA
RV8 Based at ORH - Purchased
RV8 - The Dream - Under Construction
Reply With Quote
  #15  
Old 12-22-2017, 09:03 AM
Mach.26's Avatar
Mach.26 Mach.26 is offline
 
Join Date: Jan 2017
Location: Ozark, AL
Posts: 53
Default

Aero Sport advertises a IO-382 which sounds intriguing. I figure if a 375 is good a 382 must be better Not much info on their site about it though, they have been saying its a "new engine" for years nows.... Anyone know if they actually sell?
__________________
Adam Wright
RV-8 Builder 83611
Reply With Quote
  #16  
Old 12-23-2017, 08:37 PM
Northernliving Northernliving is offline
 
Join Date: May 2005
Location: Boston, MA
Posts: 123
Default IO-382

The IO-382 does sounds interesting. I would love to hear about some real world experience behind it.
__________________
Brian J.
Boston, MA
RV8 Based at ORH - Purchased
RV8 - The Dream - Under Construction
Reply With Quote
  #17  
Old 12-24-2017, 04:42 AM
DanH's Avatar
DanH DanH is offline
 
Join Date: Oct 2005
Location: 08A
Posts: 7,842
Default

Quote:
Originally Posted by Mach.26 View Post
Aero Sport advertises a IO-382 which sounds intriguing. I figure if a 375 is good a 382 must be better Not much info on their site about it though, they have been saying its a "new engine" for years nows.... Anyone know if they actually sell?
Basically a 360 case with a 400 crank and rods, parallel valve cylinders, and roller tappets, all from Superior. ASP includes balancing, porting (with flow bench docs), a cold air intake, dual P-mags, custom paint, two cases of break-in oil, and two filters. Last OSH special was $37,450.

The 382 is Aero Sport's signature product, but actually any good engine shop can build one. Aero Sport and Barrett are Superior's two largest shop outlets.
__________________
Dan Horton
RV-8 SS
Barrett IO-390
Reply With Quote
  #18  
Old 12-24-2017, 02:02 PM
jbDC9 jbDC9 is offline
 
Join Date: Jan 2005
Location: Houston, TX
Posts: 741
Default

Quote:
Originally Posted by Northernliving View Post
I have a 180hp PV O-360, but when it comes time to replace it, I think I would go with the IO-375 PV 200hp. Light weight, PV, and 200 hp. Sounds like a winner to me.
PV? Whatís that?
__________________
John Bixby
RV-8 QB sn 82030 - 1575 hrs
O-360-A1D/CS/Pmags
New Waverly, TX

VAF donation Dec 2017
Reply With Quote
  #19  
Old 12-24-2017, 02:05 PM
judoka5051 judoka5051 is offline
 
Join Date: Aug 2010
Location: Stuart, FL
Posts: 215
Default PV...

Parallel Valve...
__________________
Lance Logan
Stuart, FL
Plane at X58

Scratchbuilt Biplane
Preceptor N3 - Sold
Zenith Zodiac 601HD - Sold (good riddance)
Kitfox IV - Sold my share, but loved that plane
RV8A Sold! Loved the plane, but not the nosewheel!
RVX (RV6/4) Sold
RV8 Project purchased (Can't help myself)
Reply With Quote
  #20  
Old 12-25-2017, 04:00 AM
mike newall's Avatar
mike newall mike newall is offline
 
Join Date: Jan 2005
Location: Yorkshire, England
Posts: 1,636
Default

Local chap had an RV8 with an IO-320 in it. Tuned exhaust, dyno said around 170hp.

Now - because it was light, it performed well and the balance - 1 up was spot on.

More isn't necessarily better as you need to consider overall weight and whether it will run nose heavy with all that stuff up front.

Dan H has good words - look at newer iterations of older motors which have lightness and power with economy.
__________________
"I add a little excitement, a little spice to your lives, and all you do is complain!" - Q

Donated in 2018
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 10:06 PM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.