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Old 02-01-2021, 10:11 PM
RCraddock RCraddock is offline
Join Date: Jul 2018
Location: Memphis
Posts: 9

Not so much a drop in as the mixture cable is a bit different and typically uses a Bowden cable style attachment if memory serves.
R Craddock

Monthly subscriber since 1/19
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Old 03-03-2021, 10:02 AM
echostar7 echostar7 is offline
Join Date: Aug 2019
Location: Savannah
Posts: 36

I think one thing being overlooked about the tbi being a drop in replacement are the requirements for fuel filtration. the TBI requires a fuel filter of 40 micron or finer to be installed to protect the TBI and the last chance needle filter is not good enough. where are you going to install a 40 micron filter?
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Old 03-03-2021, 04:29 PM
painless painless is offline
Join Date: Jan 2005
Location: Peshtigo, Wisconsin
Posts: 789

Also, there is a primer button that needs either a cable or a servo to actuate.
Jeff Orear
RV6A N782P
Peshtigo, WI
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Old 03-04-2021, 07:41 AM
Snowflake's Avatar
Snowflake Snowflake is offline
Join Date: Oct 2009
Location: Sidney, BC, Canada
Posts: 4,182

Originally Posted by 00Dan View Post
Are these units a fairly straight drop-in replacement for a carb or would airbox and cowl modifications typically be required?
Airbox and cowl, no. But your throttle/mixture cables will change as the actuation geometry is different. Also, as mentioned, you'll need a cable or servo (and possibly some mechanical linkage bits) to actuate the priming button.
Rob Prior
1996 RV-6 "Tweety" C-FRBP (formerly N196RV)
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Old 03-04-2021, 08:46 PM
RV7 To Go RV7 To Go is offline
Join Date: May 2011
Location: Ontario, Canada
Posts: 313

Originally Posted by 00Dan View Post
Still wondering in this. I may need to change carbs and for the price the rotec is an attractive option.
Not an easy change. Rotec now recommends a fuel return line and an air/fuel ratio gauge for setting it up. As mentioned the primer cable, prefilter requirements and linkage changes.

Can't speak to the O-320 size but the O-360 size is about 1.5" shorter in height than the MS carb. I tried one for about 100hrs on my 360 after doing some of the mods Rockett Bob used (1/4" insulator at the sump, 1.5"x 6" dia. plenum adapter on the inlet...Bob used a straight Venturi style adapter, A/F gauge, drilled out a few of the spraybar holes at the WOT end). Never did put in a return line but did not have an issue with hot starting. The engine ran smooth, started and idled great but ran lean at WOT. I got tired of messing with it and changed to the MS. Now have 2 of them gathering dust in the hangar. (Paul gave me a good deal on the second one which was supposed to be the solution...ran worse than the first one - never flew it) Very poor support unless I was spending money. I have read that some people have had better experiences with the O-320 size. I personally know one person that replaced his Rotec radial using the TBI with a carbed Lycoming on his new Hatz Biplane after having 3 engine failures. He also received no support.

My opinion, based on my experience is buyer beware.

Feel free to send a PM if you would like more details.
RV4 - Bought 2013 Sold 2017 after 450 hrs
RV7 - Built in 6.5 yrs & Flying 2017
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