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-   General Q & A (https://www.offshoreonly.com/forums/general-q-20/)
-   -   Lost rpm (https://www.offshoreonly.com/forums/general-q/372048-lost-rpm.html)

resurrected 06-15-2021 09:10 AM
Can a drive tighten up without scattering?

fbc25el 06-15-2021 09:12 AM
I would also check the fuel tank vent hose for a kink or blockage.

F-2 Speedy 06-15-2021 09:19 AM
What EFI is it ? if its TB have you swapped them ?

splashandburn 06-15-2021 09:31 AM
Originally Posted by SB (Post 4793722)
valet mode.

Well, things like fuel tank , gas in it, and supply line and fittings wheren't at dyno.

a cracked spark plug or two from engine installation not uncommon
ive eliminated that by running off an external 5 gallon tank with the exact same results A cracked plug is possible but not likely That motor went back in first and there's plenty of room.

splashandburn 06-15-2021 09:33 AM
Originally Posted by resurrected (Post 4793725)
Can a drive tighten up without scattering?
I thought about that but I think with the HP I'm pushing it would have exploded by now

splashandburn 06-15-2021 09:36 AM
Originally Posted by F-2 Speedy (Post 4793730)
What EFI is it ? if its TB have you swapped them ?
They're 500 efi's that were punched out to 540's. I have not tried swapping TB's yet . . .

splashandburn 06-15-2021 09:37 AM
Originally Posted by F-2 Speedy (Post 4793730)
What EFI is it ? if its TB have you swapped them ?
They're 500 efi's that were punched out to 540's. I have not tried swapping TB's yet . . .

F-2 Speedy 06-15-2021 09:40 AM
I was thinking they were carb style efi, MEFI 3 , 4 ? who tuned it ?

splashandburn 06-15-2021 09:52 AM
Originally Posted by F-2 Speedy (Post 4793738)
I was thinking they were carb style efi, MEFI 3 , 4 ? who tuned it ?
I believe they're MEFI 3. Tuned by the builder. We used the exact same program that was used before the top ends were done. Tuning was originally done on the dyno and then fine tuned in the boat using welded bungs in the headers.

J. Hordubay 06-15-2021 10:09 AM
what are you running on inlet side of prochargers, ive seen them suck filters partially closed and create a big restriction. happened to a friends 35 cig, wouldn't do it on dyno, but did it in boat


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