Mercury 409 MPI
#1
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?
#2
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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.
Pretty sure this is their 383 with some more cubes and a new crank.
Last edited by techman; 10-17-2022 at 09:14 AM.
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cheech (10-17-2022)
#4
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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
Mercruiser. Yup, beware. Manufacturing issues.
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
Mercruiser. Yup, beware. Manufacturing issues.
Last edited by SB; 10-17-2022 at 12:11 PM.
#5
Offshoreonly Advertiser
Offshoreonly Advertiser
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.
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.
__________________
Marc
www.mercruiserparts.com
www.go-fast.com
www.bammarine.com
www.cyborgtransmissions.com
It's not alive -www.BoatStuffExpress.com - temporarily retired
Marc
www.mercruiserparts.com
www.go-fast.com
www.bammarine.com
www.cyborgtransmissions.com
It's not alive -www.BoatStuffExpress.com - temporarily retired
#6
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All that For a 400hp 383 ? Nutz !
Damn.
IMHO as always.
Damn.
IMHO as always.
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IGetWet (10-17-2022)
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SB (10-17-2022)
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JaayTeee (10-17-2022)
#9
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Maybe this is technically a remanufactured engine and not subject to catalyst requirements?
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hogie roll (10-17-2022)
#10
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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.