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-   -   Mercury 409 MPI (https://www.offshoreonly.com/forums/general-q/377405-mercury-409-mpi.html)

LakeHuronPower 10-17-2022 08:55 AM

Mercury 409 MPI
 

Mercury's new 409 MPI claims to have a flat plane crank, I'm curious what advantage that gives to a boat. I also see in the pictures what looks like a Holley EFI throttle body...?
I wonder if this means Holley will be able to interact with smartcraft/vessel view stuff.
Wonder if anyone knows more about it?

techman 10-17-2022 09:06 AM

You might be able to spin it faster. What are the specs for operating max rpm range? I'm not convinced this is a replacement for a big block.

Pretty sure this is their 383 with some more cubes and a new crank.

hogie roll 10-17-2022 09:46 AM

Industry-Exclusive Flat-Plane Crankshaft

what! Need some more specs if anyone knows

SB 10-17-2022 12:08 PM

O advantage in this application. Sub 6000 rpm small block chevy. Different noise is all.
Look up / google search flat plane crankshaft v8 advantages.

I rather wish they’d spend 5 $ and a few minutes times to make their sbc exhaust manifold water passages line up to their risers.
:rolleyes

https://www.offshoreonly.com/forums/...ng-issues.html

Mbam 10-17-2022 02:19 PM

Performance 400 horsepower 5000-5800 RPM Exotic idle quality Great acceleration Flat-plane crankshaft 150# lighter than 8.1L Speed gains with Bravo One X

Technology ECM 555 SmartCraft 10-pin harness Engine Guardian MPI fuel injection Mechanical throttle & shift

Black-X valves Dry joint iron exhaust Heavy-Duty iron block Forged crank, pistons & rods Shaft-mounted roller valvetrain Full System Fresh Water Cooling Heavy-Duty Eng. oil & PS fluid coolers

Single-point water drain 3-year limited warranty 25W-50 engine oil Long-life coolant Remote oil filter 87 octane fuel

985 pounds. List price $33,425, available next month.








SB 10-17-2022 02:44 PM

All that For a 400hp 383 ? Nutz !
Damn.
IMHO as always.

AllDodge 10-17-2022 03:17 PM

Need to get rid of that single point drain system

AllDodge 10-17-2022 03:20 PM

Another thought; how are they building a motor without CAT's these days? Would be great if they could, but don't see how.

techman 10-17-2022 03:34 PM

Maybe this is technically a remanufactured engine and not subject to catalyst requirements?

techman 10-17-2022 03:41 PM

I also noticed that the Quicksilver 8.1 and the 540 Mag stroker are no longer available. Looks like this is your Mercury sourced replacement for big blocks with a warranty.



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