Offshoreonly.com
Page 5 of 6
« First
3
4
5
6
Show 40 post(s) from this thread on one page

Offshoreonly.com (https://www.offshoreonly.com/forums/)
-   General Q & A (https://www.offshoreonly.com/forums/general-q-20/)
-   -   Mercury 409 MPI (https://www.offshoreonly.com/forums/general-q/377405-mercury-409-mpi.html)

AllDodge 10-19-2022 06:50 AM
IMO the old saying is still true, no replacement for displacement when it comes to low end torque

cheech 10-19-2022 02:12 PM
Originally Posted by hogie roll (Post 4848536)
The exhaust scavenging benefit of a flat plane crank is not trivial. It would be worth 35 ft lbs of torque on the LT5 I recall.

The only trick is keeping the vibes in check.
Wonder if that's what the new engine mount ordeal is in this 409 situation?
I think that's one of the keys in the new Z06 is special mounts to combat the vibrations.

cheech 10-19-2022 02:17 PM
Originally Posted by RSCHAP1 (Post 4848634)
Wondering if any connection what so ever to newest Z06 Vette.
Only other thing I have heard domestically with flat plane crank.
Coincidence?
Doubt it, but still wonder...
Fords 2015 GT350 had flat plane also.
If I remember right that engine got nixed for timing chain issues.

hogie roll 10-19-2022 03:06 PM
Originally Posted by SB (Post 4848542)
In a boat with standard wet non tuned cast iron manifolds ?
I would say yes. Otherwise there is no reason to do it.

But also, at higher engine speeds, the short exhaust runners get closer to the tuning window. I noticed some wake boats have a true SBC cast header with a cat integrated.

Maybe reversion improves too?

hogie roll 10-19-2022 03:07 PM
Originally Posted by RSCHAP1 (Post 4848634)
Wondering if any connection what so ever to newest Z06 Vette.
Only other thing I have heard domestically with flat plane crank.
Coincidence?
Doubt it, but still wonder...
Doubt it.

hogie roll 10-19-2022 03:08 PM
Originally Posted by cheech (Post 4848724)
Wonder if that's what the new engine mount ordeal is in this 409 situation?
I think that's one of the keys in the new Z06 is special mounts to combat the vibrations.
I would bet it is.

Brad Christy 10-19-2022 04:25 PM
Originally Posted by hogie roll (Post 4848745)
Doubt it.
Didn't Chevy go to Merc to design the blown 427 that went in to the reintroduced ZR-1 about a decade ago?

Thanks. Brad.
(937)545-8991

IGetWet 10-19-2022 04:35 PM
No that was the C4 ZR1, DOHC

Brad Christy 10-19-2022 04:40 PM
Originally Posted by IGetWet (Post 4848773)
No that was the C4 ZR1, DOHC
IGetWet,

But there WAS that collab, then. So I’m not hallucinating.

Thanks. Brad.
(937)545-8991

hogie roll 10-19-2022 05:44 PM
Originally Posted by Brad Christy (Post 4848772)
Didn't Chevy go to Merc to design the blown 427 that went in to the reintroduced ZR-1 about a decade ago?

Thanks. Brad.
(937)545-8991
no


All times are GMT -5. The time now is 06:57 PM.
Page 5 of 6
« First
3
4
5
6
Show 40 post(s) from this thread on one page


Copyright © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.