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Old 02-07-2006, 04:34 PM
abuura abuura is offline
Join Date: Jan 2006
Posts: 39
Default TMX-360 and Vans Firewall Fwd kit

I would like to know what challenges builders who have mated a TMX-360 from Mattituck to the Vans Firewall Forward kit for an O-360 (FF-7 0-360 CS for me) have experienced. I assume the smoothest fit is between a factory Lycoming and the appropriate FFWD kit, but if there's not too much customizing, I'd like to buy a TMX.
David Abrahamson
Reston, VA
RV7, N98DA, TMX-O360, CS, slider
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Old 02-07-2006, 05:21 PM
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McFly McFly is offline
Join Date: Sep 2005
Posts: 333
Default It's a good fit

I went with a caburated, FP TMX-360.

Thier custom oil filter pad caused some grief when hooking up the Vans tach sender (I am not sure I would go with Vans tach if I did it again). Mahlon and Mattituck were awesome about solving the issue. I honestly don't know what they could do to improve thier service. It was that good.

The Mattituck oil pad looks like it may also cause some interference issues with the oil lines with the oil coller mounted on the rear baffel. I am not quite there yet, so this may premature. If it does cause a problem, I have no doubt Mattituck will make it right.

These have been my only issues so far. Go for it
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Old 02-07-2006, 05:21 PM
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Ironflight Ironflight is offline
VAF Moderator / Line Boy
Join Date: Jan 2005
Location: Dayton, NV
Posts: 11,792
Default No Challenges at All!


A TMX-360 doesn't know that it's not a Lycoming...

The FWF kit for my -8 mated perfectly with both the airframe and the engine - of course, you're going to have to spend considerable time crafting the baffles no matter which engine you choose - that's part of the rights of passage.

If that is your only worry, then stop worrying and give Mattituck a call!

Paul F. Dye
Editor in Chief - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)
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Old 02-07-2006, 06:05 PM
mahlon_r mahlon_r is offline
Join Date: Jan 2005
Posts: 972

The only external difference between O-360-A1A and TMX O-360 constant speed are the oil filter adapter and maybe the dipstick tube length if you are an RV-8 or 4. We can configure with the Lycoming style oil filter adapter, if you want to make it exactly the same, but you lose the easy to get too filter setup that way.
Good Luck,
"The opinions and information provided in this and all of my posts are hopefully helpful to you. Please use the information provided responsibly and at you own risk."
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Old 02-07-2006, 09:45 PM
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cjensen cjensen is offline
Join Date: Jun 2005
Location: Milwaukee, WI area
Posts: 2,963

TMX-360 as an alternative engine???
Chad Jensen
RV-7, 5 yr build, flew it 68 hours, sold it, miss it.
Vertical Power - Astronics Advanced Electrical Solutions division
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Old 02-07-2006, 10:32 PM
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osxuser osxuser is offline
Join Date: Aug 2005
Location: Pasadena CA
Posts: 2,484

Originally Posted by cjensen
TMX-360 as an alternative engine???
When you think about it, the TMX is an alternative to say, and eggenfeller.

Stephen Samuelian, CFII, A&P IA, CTO
RV4 wing in Jig @ KPOC
RV7 emp built
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Old 02-08-2006, 06:56 AM
N184JG N184JG is offline
Join Date: Oct 2005
Location: OWASSO,OK
Posts: 189

I have the same question,I will be using the ECI kit engine with ECI fuel injection.
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Old 02-08-2006, 07:49 AM
mahlon_r mahlon_r is offline
Join Date: Jan 2005
Posts: 972

ECI fuel injection is not standard and is unique to itself. Using that system will require modifications over the standard aircraft configuration for the Precision Airmotive systems supplied on most Lycoming IO-360's.
I think Robbie Attaway has installed the ECI system on his aircraft and maybe he can tell you the differences he had. You will need a return fuel line for starters.
We should be running the first complete production version of the eci magnesium sump engine equipped with lightweight cylinders and eci fuel injection system some time early next month. Will keep you posted on the skinny.
Good Luck,
"The opinions and information provided in this and all of my posts are
hopefully helpful to you. Please use the information provided
responsibly and at you own risk."
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Old 02-08-2006, 09:41 AM
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Rene Bubberman Rene Bubberman is offline
Join Date: Aug 2005
Location: Delft, the Netherlands
Posts: 216

We did not have any problems with the combination of the TMX IOF-360 and the Vans FF kit. We only deleted some parts from the kit. Details of our TMX on

René Bubberman

PH-VII | RV-7 | tip-up | FADEC
Flying | 480 hours

PH-RVP | RV-7A | slider
Flying | 5 hours
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Old 02-08-2006, 10:23 AM
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Davepar Davepar is offline
Join Date: Jan 2005
Location: Seattle, WA
Posts: 1,166

Here's what I've run into so far with fitting the Vans FFWD kit to my TMX-360 with forward facing/horizontal induction and Precision Airmotive fuel injection:

1. One of the fittings to the oil cooler (can't remember if it's input or output) is blocked by the oil filter adapter. You just need to order a 45 degree fitting instead of using the straight fitting that comes in the FFWD kit. You have to remove the filter to install it, but you'll need to remove the filter anyway when you install the engine. No big deal.

2. The oil filter adapter also blocks the standard Vans crankcase breather set up. I haven't sorted it out yet, but it looks like you just have to change the routing a bit. Also, not a big deal.

3. The mixture and throttle cables and brackets look like they're going to work fine with one minor exception. The bracket that is attached to the bottom of the sump locates the throttle cable very close to one of the exhaust pipes. I've seen a few builders fabricate a new bracket out of Al angle. I'm going to try tweaking the bracket. Not a big deal.

4. Van's provides a straight fitting for the inlet to the engine-mounted fuel pump, but that would cause the hose to hit the bottom of the prop governor mounting base. Mattituck supplied an extra 90 degree elbow with my engine, so I used that. That makes the hose from the firewall to the pump a little long, so I might have to shorten it. I think this problem might actually occur on real Lycomings as well, because I think I remember seeing the same issue on Walter's site.

That's about it. I haven't installed everything, but the engine mount, cowl, exhaust, and baffles seem to fit similarly to a Lycoming. There are so many things that you need to tweak in the FFWD kit (especially the baffles) regardless of engine choice that these are really minor issues. Also using the Precision Airmotive fuel injection rather than Airflow Performance helps quite a bit. I believe the AFP requires changes to the throttle and mixture cables and the induction plenum.

Dave Parsons, Seattle, WA, RV-7A, sold - building blog - airport info, online charts, live METARs, TFRs, etc.

Last edited by Davepar : 02-08-2006 at 02:42 PM.
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