Corvair Powered

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fred wook
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Corvair Powered

Post by fred wook » Mon Apr 23, 2007 9:55 pm

Hello, I am currently re-building a 110 HP Corvair engine tha I would like to put on an airboat hull. I am thinking about a 12x7 ultralight hull. I was wondering if anyone has any experience with Corvair engines for airboats. I have read a lot on the internet about corvair conversions for aircraft but not too much for boats. Any tips or info would greatly be appreciated...Thanks..Fred in SC

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Whitebear
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Post by Whitebear » Mon Apr 23, 2007 10:00 pm

Back in the day when Corvair was popular there were a few DD Corvair boatrs around. The biggest issue was finding a reverse rotation prop.

I suggest if this is a dedicated project for ya that you seriously consider a reduction drive. A reversing drive would make it possible to use a standard rotation prop as well as give it massive increases in tourque which it sorely needs.

Corvairs also needed proper shrouds to cool them, geez its been so long I cant remember all the troubles they had. Stick around some of thse folks will remember and likely share all the info you will need.

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speed wheelie
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Post by speed wheelie » Mon Apr 23, 2007 10:06 pm

My first airboat had a corvair engine..That was back in 1981..Damn i'm getting old.
It had 4 -1 barrel carbs two on each bank..That boat ran the hill good..I moved up to a 470 gpu!
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gat2013
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Post by gat2013 » Tue Apr 24, 2007 8:57 am

the guy next door to me had one on a 11 foot aluminum boat with shallow sides and it ran good.

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Re: Corvair Powered

Post by goatwings » Tue Apr 24, 2007 9:08 am

fred wook wrote:Hello, I am currently re-building a 110 HP Corvair engine tha I would like to put on an airboat hull. I am thinking about a 12x7 ultralight hull. I was wondering if anyone has any experience with Corvair engines for airboats. I have read a lot on the internet about corvair conversions for aircraft but not too much for boats. AIny tips or info would greatly be appreciated...Thanks..Fred in SC
if you call paul dixon in bainbridge, ga. he has or had one for sale.

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Post by Olf Art » Tue Apr 24, 2007 9:08 am

Fred, go to the search feature at the top of this page. I seem to remember a couple of old threads on here about the Corvair engines.

One thing that I do remember is that you need to retain the original cooling shroud and fan for them to be reliable.
Hope this helps.
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dblj006
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Post by dblj006 » Tue Apr 24, 2007 9:26 am

ImageImagehttp://www.flycorvair.com/
Here's a link for Corvair aircraft. There is a link about a manual for converting to aircraft.
Read down below the manual there is some good info on engine overhaul issues.

I'll like to have seen your 140hp boat speed wheelie. (4 carbs)
Last edited by dblj006 on Tue Apr 24, 2007 9:34 am, edited 2 times in total.

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Post by T-REX » Tue Apr 24, 2007 9:32 am

how much does those corvairs weigh?

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Post by dblj006 » Tue Apr 24, 2007 9:39 am

Info borrowed from the link above

Direct Drive Corvair Engine
Spec Sheet
Engine Model

O-164

O-190
Number of Cylinders Six Six
Cooling Air Air
Displacement 164 cubic inches (2,700cc) 190cid (3,100cc)
Bore 3.43 in. (87mm) 94mm
Stroke 2.94 in. (75mm) 75mm
Compression Ratio 9:1 9:1
Oil Capacity 4.5 - 7.0 quarts 4.5 - 7.0 quarts
Weight Wet, Ready to Fly with Electric Start Approximately 220-225 lbs. Approximately 212-217 lbs.
Length Approx. 28 in. Approx. 28 in.
Width 28.5 in. 28.5 in.
Performance
HP 100@3,150 rpm 120@3,200
HP (Continuous) 90@3,000 rpm 110@3,000
Torque 160 ft./lbs. @2,800 rpm 200 ft./lbs. @2,800
Fuel 93 Octane Auto Gas or 100 LL 93 Octane Auto Gas or 100 LL
Fuel Flow 5.6 GPH @ 75% 7.0 GPH @ 75%
Accessories

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Post by Sniper » Tue Apr 24, 2007 10:18 am

The first Airboat I ever rode in had a corvair engine in it and it ran awesome you can get a lot of hp out of one of those engines I would look for a set of Corsa heads they will give you 140 hp and I think they have the same bell housing as a small block chevy so a gear box for one should bolt right up with out a lot of trouble and the one I rode in did not have the cooling shroud or fan on it and it never over heated but I would make sure that it had good air flow over the engine
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Whitebear
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Post by Whitebear » Tue Apr 24, 2007 10:46 am

I remember a friend had one when I came back from Navy Boot Camp. He had one of the final renditions. It was a Corsa with 210 HP and the damned thing was a real screamer. I only rode in it once but it was a bad as a Porsche on the road. In fact they used to call them the Poor Mans Porsche. They did well with the turbo.

With todays technolody, were they just coming out, they likely would be a major success as crate motors for the airboating world. Same for the VW engines.

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Post by Duece » Tue Apr 24, 2007 11:29 am

My dad had 2 boats w/Corvairs on them. They did pretty good, but were'nt hill burners. The first boat he had was a 11' glass hull that had the 110 hp (2 1 barrel carbs) engine. It was a little one man boat, but it did good for what they used it for. The second boat they built was a 10' sled w/the 140 hp (4 1 barrels) on it. That little thing was some kinda fast, and some kinda squirrely! It only ran a few years as my uncle t-boned a channel marker in Fish Creek just north of the St. Martin's river one morning going duck hunting. The only problem I remember them having w/that boat was they never could get the back 2 carbs to open all the way up.

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speed wheelie
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Post by speed wheelie » Tue Apr 24, 2007 7:14 pm

You know thay make a kit to change the rotation of the corvair..Cam and dis.gear is all it takes..back in the day that use to run them on vw buggys
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fred wook
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corvair

Post by fred wook » Tue Apr 24, 2007 10:21 pm

Thanks for all the input!! I am in coastal SC but haven't found anyone that runs an airboat around here so I am kinda on my own. I got a 110 hp corvair engine at a good deal and have it all torn down for a rebuild. I was wondering about the prop because these engines run opposite from most. I also was wondering if the prop runs off of the flywheel end or the balancer end. I assume that it runs on the ring gear end..anyways..thanks a bunch..Fred in SC

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Post by Moritz » Tue Apr 24, 2007 11:21 pm

WHAT I REMEMBER WAS THE 140 & 110 PUSHED THE BOATS THE SAME. WE HAD THEM ON 16 FT JOHN BOAT. THE 140 NEEDED PRMIM GAS & THE OTHER REGULAR. THE 4 CARDS WERE A BITCH TO KEEP ALL 4 WORKING. THE 110 WAS NOT THAT PICKY. BOTH ENGINES HAD THE FACTOR COOLING SHOULD & FAN THAT CAME WITH THEM IN THE AUTO & NEVER OVER HEATED. DID HAVE TROUBLES WITH CARB ICING. WE USED A BANKS MAXWELL WOOD PROP ON ONE & A METAL AIRCRAFT THAT WAS CUT DOWN & REPITCHED.

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R L Williams
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corvair

Post by R L Williams » Sun May 20, 2007 7:20 pm

Hi Fred, I owned a corvair rig a few years ago with 110 engine mounted in two aluminum A frames joined by a piece of channel with prop shaft, (prop flange on one end and pully on other) running across top of channel with one load and thrust bearing and one pillow block hinged to adjust belts, (four matched belts, 1.75 ratio). Used corvair bell housing with shaft bolted to crankshaft two bearings to mount lower pulley. Ran a prop for a 100 horse continental about 2850. Low center of gravity, handled very well and was good fishing boat. I kept all original shrouds and cooling fan and it ran very cool. Could run dry from lake to lake, but could not stop and then start again.

Had this in a 12' Chickasaw built in Orlando by Jimmie Castleman and Ben Downing.

Using this setup, you have correct rotation and can use standard AB prop.

Do any of you guys know if these two guys are still around and can be found?
Last edited by R L Williams on Tue May 22, 2007 11:32 am, edited 4 times in total.

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Post by dantheairboatman » Sun May 20, 2007 11:32 pm

If it uses Chevy bell housing Stinger can modify there boxes to run either direction .
Ox Box. Billet gear reductions and clutch systems
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Post by airboat_Mike » Mon May 21, 2007 12:14 am

We still have alot of direct drive corvair boats around here. I have one. It has been sitting for a few years but plan on getting it up and running oneday soon.
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Post by FP1201 » Mon May 21, 2007 10:29 am

dantheairboatman wrote:If it uses Chevy bell housing Stinger can modify there boxes to run either direction .


Actually if the problem with Corvair engines is reverse rotation, then the addition of a geared box would make the rotation the same as AC engines, plus the added torque would allow for more prop....maby a little pricy, but doable. Certainly would be unique. 8)
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Post by Whitebear » Tue May 22, 2007 11:23 am

Hey folks, heres a picture of RL Williams Chickasaw boat.

Image

Scotty
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R L Williams
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Post by R L Williams » Tue May 22, 2007 11:42 am

Thanks Whitebear, sorry about quality of pic, (old faded 3.5X3.5) you should have cropped that guy out of pic, I didn't know how. :lol:

RL

fred wook
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Post by fred wook » Tue May 22, 2007 5:56 pm

That's an interesting drive setup. Looks like the engine sits pretty low. You don't have any pics of the drive setup do you??? Fred

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Post by mudkat » Tue May 22, 2007 7:10 pm

I have a brand new prop for a 110 hp corvair let me know if you need it and the prop hub ,kylekleb@prodigy.net

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R L Williams
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Post by R L Williams » Tue May 22, 2007 9:47 pm

Fred, thats the only pic that I have that shows anything. That rig surprized a lot of people with the way it ran. It did handle real well with weight down low. The man I sold it to put a 140 hp and 2 to 1 ratio and it really performed, :shock: I wish I had kept it, but no, I had to have a aircraft rig that would run dry to spend money on :roll: .


RL

fred wook
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Post by fred wook » Wed May 23, 2007 8:07 pm

RL thanks for the photo. Sure wish i were closer to you guys and gals in florida. Gettin tired of seeing nothing but bass boats up here in SC!!

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