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11-30-2022, 11:21 AM #1
Retrofitting OMC/BRP outboards with port EFI
I was at the local island get-together last Labor Day (Disappearing Island, Ponce Inlet FL) and someone mentioned I should post the build up of these retrofit projects on S&F so here goes... This one was a 2.6 crossflow V6, there is an eTec V6 and V8 retrofit to port EFI in process and coming soon. Then maybe and old Looper as well.
I did this 2.6 crossflow retrofit to EFI almost 2 yrs ago on a block that was just about to be scrapped. This motor had seen better days. I picked it up for parts 15 yrs ago and the guy said it blew up when he started it after his own rebuild. I found it had an even fire timing base with an odd fire crank! (wouldn't have run long if it ever started), the crank bearings had been put in wrong so they pushed the pins in flush, one wrist pin had carved a nice finger port into the cyl wall after a clip was left out and one cyl had detonated and stuck and needed a sleeve! I was just looking for extra bolts when I bought it for $50.
This is the block at the start of the project:
-BL
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Laker liked this post
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11-30-2022, 11:31 AM #2
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11-30-2022, 11:38 AM #3
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11-30-2022, 11:45 AM #4
I think this motor did have the good heads and I used them on other crossflows long ago so in the sense of keeping this a total "from just junk around the shop" build-up I nominated these hi perf babies for the project! Found deep under the shop bench in the corner. Lol Total junk bath tub heads good for nothing but leveling your camper.
-BL
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11-30-2022, 11:50 AM #5
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11-30-2022, 11:59 AM #6
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11-30-2022, 12:05 PM #7
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powerabout liked this post
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11-30-2022, 12:51 PM #8
Injector bung and fuel rails. The Bungs were glued in completely on this motor because the side covers allow a nice way to form a "puddle". On the eTecs and others I tack them in with a Tig then glue. The rails can simply be drilled to the right size, chamfered and polished. No need to get fancy. I use -8 AN because it has good volume and the extra size allows a margin for error or options when doing these custom setups. I always use Bosch EV14 injectors as they are the latest, have very good open/close speeds, nice tight connectors and come in 3 lengths, short, mid and long. These are the mid length size 550cc.
-BL
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11-30-2022, 01:05 PM #9
Final assembly, prob skipped a lot of steps here, nothing special in the motor, all stock, all junk from around the shop. I did use new rings and gaskets Just using the carbs as a cheap throttle plate, no fuel. On this build-up I actually had hooked up fuel to the carbs so I could switch back and forth from EFI to carb (just disabled the injectors at the ECU). The EFI ran so much batter I never went back to the carbs and finally disconnected all hoses and low psi pumps to them.
Last edited by BLisBack!; 11-30-2022 at 01:09 PM.
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11-30-2022, 01:21 PM #10
Installation on the boat, EGTs are a must for setting up the EFI fuel map. The map is a TPS/RPM based map otherwise known as Alpha-N, this type map works great for motors that don't see much changing load as an outboard running WOT. I also like an adjustable regulator, with the EV14s you can go from 20-100psi and have all the benefits of high psi injection.
-BLLast edited by BLisBack!; 11-30-2022 at 04:04 PM.
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11-30-2022, 02:32 PM #11
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11-30-2022, 02:37 PM #12
Break-in and other links. The one think that was so much different than the carb motor was how smooth it could idle and its dock manners were so much better because of the slower idle speeds it could do. Remember this is no performance build-up, and the boat is just a test boat. So nice being able to adjust the mixture and engine timing from the ECU's touchscreen. What a pain that was with the carb motors back in the day. Starting from the touchscreen is so cool and even better than the OEMs, even the stock charging systems is integrated and works.
Break-in;
https://youtube.com/shorts/gEWSa8uK6CI?feature=share
Break in complete;
https://youtube.com/shorts/dNTji9g8e-8?feature=share
On the water testing;
https://youtube.com/shorts/QYQV4yLDPNs?feature=share
Instant starting and Timing/Fuel adjustability;
https://youtube.com/shorts/v-ig0IzyAEY?feature=share
Charging system integrated;
https://youtube.com/shorts/AIV9ecGGHcI?feature=share
-BLLast edited by BLisBack!; 11-30-2022 at 04:09 PM.
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LakeFever, powerabout thanked for this post
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11-30-2022, 04:36 PM #13
Wow that idles like a dream. Ive never heard anything like it. That touch screen and ecu combo what is it?
Hydrostream dreamin
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11-30-2022, 04:40 PM #14
Look it up on Google.
VSFI2006 Action Marine Comp
1980 Ventrua 2
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11-30-2022, 06:05 PM #15
I'm Impressed, how in the world did you figure out the even fire timing plate, so few of those cranks were made?
I had a even fire crank back in 1985, but don't remember anything but the $2500.00 price, I just Googled what $2,500. was
worth in todays money, $7,000.
Great JobWe have invented the world; WE see
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