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Larger engine for Cheetah?

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n26780(at)cox.net
Guest

Posted: Mon Nov 03, 2008 6:06 am Post subject: Larger engine for Cheetah?

I have a 79 Cheetah that I have owned for over 20 years.  It gets me there, but I was wondering if anyone had ever installed a larger engine (0-360 180HP or 200HP) in  a Cheetah.  

   

I’m trying to decide if I should trade or sell it and buy a RV-6-7-8.  

   

Jim  

       [quote][b]

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JHOSLER(at)epri.com
Guest

Posted: Mon Nov 03, 2008 6:16 am Post subject: Larger engine for Cheetah?

Jim:  

  

 My 1977 Cheetah was converted to a "Tiger" in 1980 under an  STC. The conversion involves installation of an 0-360-A4K engine and the  installation of a thicker thru wing spar to allow the increase in gross weight  to 2400 lbs.

  

 I have had the plane since 1981 and could not be  happier.

  

 If you have any questions give me a  call.

  

 John Hosler

 704-595-2226 (North Carolina)



   From:  owner-teamgrumman-list-server(at)matronics.com  [mailto:owner-teamgrumman-list-server(at)matronics.com] On Behalf Of  JimFudge

Sent: Monday, November 03, 2008 9:03 AM

To:  teamgrumman-list(at)matronics.com

Subject: Larger  engine for Cheetah?

 

  

I have a 79 Cheetah that I have owned for over 20  years.  It gets me there, but I was wondering if anyone had ever installed  a larger engine (0-360 180HP or 200HP) in  a Cheetah. 

  

I’m trying to decide if I should trade or sell it and buy a  RV-6-7-8. 

  

Jim

[quote]



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flyv35b(at)minetfiber.com
Guest

Posted: Tue Nov 04, 2008 5:25 am Post subject: Larger engine for Cheetah?

Yes, there have been quite a few with the O-360-A4K  engine installed.  Some were even done without installing the Tiger center  spar.  There is an STC available that you can purchase for this conversion  but some of the parts required, like the airbox, are getting very difficult to  find.

  

 There have only been about 3 or 4 that I know of that  have had a 200 hp angle valve engine with a constant speed prop installed.   There is no multiple STC that you can purchase to do this  installation.

  

 Of course the RV-6-7-8 or the  2A 2 versions (tricycle  gear) are great planes if all you want is a 2 place aircraft.  An RV-9A  with a 160 hp engine and fixed pitch prop also will make an economical plane  with very good performance.  You have to decide on what your mission is and  what you want the plane to do.  The RV's are really in a higher performance  category than a Cheetah or a Tiger and can be purchased from $50K to $100K,  depending on the model, equipment and condition.  An RV-6A is the cheapest  and probably the most bang for the buck so to speak for a side by side seating  configuration.

  

 Cliff  A&P/IA

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GrummanDude

Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA

Posted: Tue Nov 04, 2008 9:06 pm Post subject: Larger engine for Cheetah?

The airbox is rare indeed. Â If the airbox were more plentiful, I could put my cowling on the AG5B. Â  

 

  I have looked into having the airbox made. Â I need one, preferably a really straight one, to disassemble and have tooling made. Â I've also looked into having it made of fiberglass. Â Tooling would be easier. Â 

  

 

  The Beech BuccaneerÂ has an airbox that has been used. Â It only has a 3 inch inlet though. Â Three inch diameter, 7 sq inches, is fine at speed. Â It's on climb-out that 7 sq inches is marginal. Â 

  

 

  The airbox and inlet combination on the AG5B is so bad that it isn't worth pursuing. Â 

  

 

  The 200 hp engine requires far too many mods to make it worth the aggravation. Â A parallel valve 180 hp fuel injected engine provides all of the gains of the 200 hp and saves 40 lbs. Â Port and polish a 180 hp IO360 and you'll have 200+ hp. Â All of the existing baffles, engine mounts, and everything else stays common with the O360-A4K.

 

 

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AuCountry Aviation
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