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Old 08-07-2022, 01:55 PM
Hawg Driver's Avatar
Hawg Driver Hawg Driver is offline
Join Date: Sep 2013
Location: Fort Smith, AR
Posts: 72
Default Anyone replace their Ellison w/ a Rotec?

Hey Everyone,
After way too much time wasted, Iíve given up on making my Ellison work again. Despite it working great for many years, I just canít fix itÖdespite multiple attempts to clean, rebuild, adjust and repeat.

I love going upside down too much to go back to a carburetor and my only non-nuclear option I know of is going to a Rotec. Anyone do this before? How form/fit a replacement is it?
Patric "Balls" Coggin
RV-4: Purchased Flying
2022 Dues Paid Up
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Old 08-07-2022, 02:23 PM
rmarshall234 rmarshall234 is offline
Join Date: Jun 2008
Location: San Diego, CA
Posts: 400

I'll be watching for a response as well.

Rotec certainly has factory support and I see they have combined the diaphragm so It's a single unit now. The two used to be separate.

It sure would be nice if they would service our old Ellisons too. I'm sure they are set up to bench test these kinds of units and probably know all the parts as well. It's prolly not a good business decision however.
Robert Marshall
RV-3 N333LT - 500hrs PIC
AFF Skydiving Instructor (Ret)
IF1 Reno Racer (Ret)
IF1 Crew Chief
A&P / IA
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Acroduster SA750 - Almost finished!
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Old 08-08-2022, 03:42 PM
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KRviator KRviator is offline
Join Date: Oct 2009
Location: NSW, Aust...
Posts: 869

Must be something going around - I got a PM from another Ellison owner the other day asking about my Rotec.

Bear in mind I have never owned an Ellison, but here's my reply to 'im:

I'm quite happy with the Rotec, however, went from a 40-4 (Mk 1) to a Mk 2 48/4-5 when I experienced vapour lock running Mogas (never on Avgas). I did notice an increase in indicated fuel flow when I did that, though actual flow remained relatively stable. I can't explain that except by the change in redcube outlet fittings to suit the new delivery hose.

I did have to drill out a few of the spray bar holes very slightly early in the piece (for the 40-4) but once I'd done that, she performed very well, apart from the above mentioned vapour lock.

When I went to the 48/4-5 I wrapped the FWF fuel system in exhaust wrap and have only had one more experience of it since - that doing an AOA recalibration with the slow flight stuff resulting in lower fuel flows. You'll probably need to either build a spacer or redo your FAB to suit the shorter TBI - though I'm not sure how high the Ellison is compared to a carb, and you'll also need to DIY an angle bracket for your throttle (runs fore/aft on the RHS of the RBI) and a bellcrank for the mixture (Runs L/R in front of the TBI). You can see the mock-ups I did for them on my Flickr gallery HERE.

Hope that helps, but if you've any specific questions, please let me know.
Once you have tasted flight you will forever walk the earth with your eyes turned skywards, for there you have been and there you will long to return - Leonardo DaVinci

My Flickr gallery:

RV-9A - Finished on 10th February 2016 after 4 years, 9 months and 19 days! The 1020th RV-9 flying.

First flight 26th March 2016. Essential specs 145KTAS @ 2400RPM, 8000', 24.2LPH, Initial RoC 1800FPM.
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Old 08-08-2022, 04:16 PM
painless painless is offline
Join Date: Jan 2005
Location: Peshtigo, Wisconsin
Posts: 816

An interesting aside. While at OSH I was strolling down the outside displays and noticed a Rotec TBI installed on the engine on display in the Corvair booth. Had a nice conversation with the gentleman there and he explained that they started going with TBIs after having trouble with use of a standard carb on their engines. Canít remember what the specific issue was, but since they have used the TBI, that issue has been resolved.
Jeff Orear
RV6A N782P
Peshtigo, WI
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