AeroInjector on Revmaster
Posted: Tue Aug 02, 2022 1:03 pm
by BRS
Has anyone tried the AeroInjector on their Revmaster R2300?
Anyone have an AeroInjector for sale?
This is not a new problem to VW engines, Cylinders 1&2 (pilot side) run a much different (150˚F EGT) mixture than do Cyls 3&4. That and a few other things make me think trying an AeroInjector in place of the similar RevFlow might provide better results. I don’t have space for a float carb, don’t waste any keystrokes suggesting one.
To be honest I’m just now starting to research the AeroInjector so this is really the beginning of the process.
What thinkith thou?
Re: AeroInjector on Revmaster
Posted: Tue Aug 02, 2022 7:51 pm
by GordonTurner
Try a float carb…. Jk
I don’t know anything about it…but I know some guys have had success changing the orientation of the aeroinjectir, I’m sure there’s a thread about that somewhere. Maybe worth investigating
Re: AeroInjector on Revmaster
Posted: Tue Aug 02, 2022 10:00 pm
by BRS
GordonTurner wrote:Try a float carb…. Jk
I don’t know anything about it…but I know some guys have had success changing the orientation of the aeroinjectir, I’m sure there’s a thread about that somewhere. Maybe worth investigating
Thnx Gordon, I hadn’t thought of just ‘cocking’ the carb a bit in the mount. Will give that a try.
-brs
Re: AeroInjector on Revmaster
Posted: Wed Aug 03, 2022 12:10 am
by gammaxy
I didn’t notice anything when I twisted mine. I think since only one side of the engine breathes at a time, you can’t really send extra fuel to one side of the engine by clocking it.
Have you been able to confirm the cooler side really is richer by showing its EGTs peak later than the hotter side?
Re: AeroInjector on Revmaster
Posted: Wed Aug 03, 2022 12:40 pm
by GraemeSmith
I found I could get a better balance between left and right on the AeroVee with an Aeroinjector by varying the thickness of the gasket between the manifold and the cylinder head. Aeroconversions supply a plate (ACV-M01-17 Intake Manifold Spacer Plate) to go in that gap - but I found that by leaving it out on one side and in on the other - I got the mixtures to really balance out left/right.
Re: AeroInjector on RevFlow
Posted: Thu Aug 04, 2022 12:34 pm
by BRS
Seems my uneven flow is based upon a rookie mod. After lots of thread reading and a quick conversation with Joe at Revmaster is seems clear (is that an oxymoron using ‘seems’ & ‘clear’ together?) that I oops-ed when creating my ram-air induction. I had read some about ram-air not working with the AeroInjector but seeing and mis-interpreting the picture/info on the Revflow carb let me to think that for some reason ram air would be fine.
RevFlow pic shows a cold air intake valve exposed to ram-air. BUT since that ram-air is free to exit in reverse flow (inside to outside) through the filter it does not really increase the MAP thus it’s not pushing the fuel backwards at the needle.
revflowass.jpg (42.56 KiB) Viewed 14022 times
The symptoms I’ve been having make sense now. On takeoff I was experiencing what seemed to be very lean conditions while the jet is clearly adjusted very rich. Soon I’ll have this all sorted out by eliminating the ram-air or perhaps later installing a balance tube from ram-air to the fuel tank. For now I’m going to go with just a filter in warm air and block the ram altogether.
Re: AeroInjector on Revmaster
Posted: Fri Aug 05, 2022 8:42 am
by bvolcko38
I have given much thought to ram air also. I even went as far as providing a connection for plumbing a vent into the fuel tank that would “see” ram air pressure.
Re: AeroInjector (Ram & fuel vent)
Posted: Fri Aug 05, 2022 9:57 am
by BRS
bvolcko38 wrote:I have given much thought to ram air also. I even went as far as providing a connection for plumbing a vent into the fuel tank that would “see” ram air pressure.
There was another poster who mentioned adding equalizing pressure from the ram air to the fuel tank would work. Makes sense. Did you actually add the vent or just think about doing so?
-I’d like to hear from anyone who has actually done this.
Re: AeroInjector on Revmaster
Posted: Sat Aug 06, 2022 8:30 am
by bvolcko38
I never added the vent, just made provision to do so.
Followup: AeroInjector on Revmaster
Posted: Fri Aug 12, 2022 8:17 pm
by BRS
Today I made considerable progress to figuring out what causing mixture (lean & uneven) conditions.
Uneven: Swapping a few probes proved that it was the probes which are at fault. On the cold EGT cylinders I had cut a bunch of excess wire instead of making a ‘service loop’. Seems that did not work out so well. I’ve been searching and can’t find that shortening the Type-K thermocouple wires was a no-no. I have two new ones on order.
Running lean: After figuring out the above, I continued to ground test referencing only the two warmer EGT’s. It seemed that no matter how much I enriched the needle it was still too lean. After calling RevMaster, Joe said that they recently made a small change to how the mixture cable was routed. Seems my routing was not allowing enough needle travel. A fix is in the works.
Rotec MKII on Revmaster
Posted: Thu Dec 14, 2023 1:06 pm
by BRS
I’m reviving this old thread but now I’ll have to call it 'MKII on Revmaster" since the AeroInjector is shelved and replaced by the Rotec.
My original goal was to be able to use the installed RV snout (pics in earlier posts above) for cool ram-air but turned out that was not very compatible with the AeroInjector nor the RevFlow carb either. Fast forward to yesterday’s ground test. I now have the Rotec MKII installed and tuned (flown twice), and since the Paul at the factory told me ram-air on the MKII would work fine, the next step was to plumb the MKII to the snout. Did a tied-down full throttle test yesterday which showed not only 3100 rpm (same as before) but the max fuel flow actually increased from 8gph to 8.5 gph. All this with no change in fuel tank venting. So in baby steps I’m working confidently toward a flight test and waiting on drier weather. It’s understood that flight speeds may produce different results than just static prop blasts.
To make the connection from the MKII to the snout a 3d part was drawn up and printed from Nylon-6.
It took some time to figure out how to make the connection. Options were to make the connection then close the cowl -or- close the cowl then make the connection. This is what I came up with (pic). I can sort of manipulate the snout-adapter into place while closing the cowl then reach in the front and align it after closing the cowl. The spring scat tube pushes the adaptor into place and holds it. This is nice so when opening the cowl, no special precautions are needed to disconnect the scat. It just pulls out of the snout as shown.
Here is what it looks like from the front. After closing the cowl, a hook is used to give a tug on the adaptor to make sure it is seated then the foam filter is set in place from the outside. The filter, btw, is cut from a Brackett Aero Filter BA6108 which goes on some Cessnas.
I hope to post again about this after a flight test.
Re: AeroInjector on Revmaster
Posted: Sat Dec 16, 2023 11:04 pm
by BRS
Got to test fly this with ram air today. In short, the engine didn’t lean out and quite once getting to flying speed. I’m sorry I forgot the data card in the Xtreme EMS as reading the data on a flight like this is always a highlight. I recall the full throttle rpm at a slight climb (the speed will be on the data card) was 3270 @ 7.5 gph. That’s about 100 rpm higher than I’m used to.
Re: Rotec MKII on Revmaster
Posted: Fri Feb 16, 2024 11:55 am
by BRS
Still fine tuning things on the Rotec MKII. When I first setup the primer cable it was configured to pull-for-prime. But this turned out to be inconvenient since my starter button is push-to-start and I wanted to be able to prime and crank a the same time with the same hand. Couldn’t figure out how to pull on the primer and push on the starter at the same time.
So yesterday was spent cobbling the linkage below for a push-to-prime solution. When I google the MKII for pictures/examples I don’t find very many. So I wanted to be sure to post this, so far untested, solution pic for the search engine bots to pic up.