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  1. #16
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    The T-4 3.4 Litre V-6 was an EFI only powerhead & was on a short 12'' open exhaust midsection & speedmaster gearcase, that was only intended to be used on a tunnel hull. Some had a slightly larger bore for more horsepower. The standard 3.4 EFI powerhead was approximately 340 horsepower, the analog computer could be programmed for a bit more. Big-bore versions even higher.
    Last edited by FUJIMO; 08-18-2019 at 04:35 PM.

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  3. #17
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    Bernard, u used to know someone that had a 450 horsepower version, didn't you?

  4. #18
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    There is a pair in Bay City I've serviced for many years on a grady white. The old man has old timers I'm told...but in the past twenty some odd years Ive built one gearcase and usual carb and fuel pumps, a switch box or two..they were propped at 5400 and were very civilized idling. Id rather have a 3.4 than a styrofoam half johnson 3.0.

  5. #19
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    yep, just keep the r's down & your good. they last. I would have to guess though...your customer doesn't use his boat much?

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  7. #20
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    1975
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    Thank U space alien Fuji.....May the force b w/ya......Just gathering.... spectys....From that.... know...

  8. #21
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    Quote Originally Posted by FUJIMO View Post
    yep, just keep the r's down & your good. they last. I would have to guess though...your customer doesn't use his boat much?
    Shiz tons of hours on it. He ran salmon charters for the hey day years along with perch fishing trips for fill in. They still run fine and i should proberly track the boat down for a cheap cruiser.

  9. #22
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    1975
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    I have not seen a .3.4 broken..... short of the early ones with 5/16 sps rod bolts....or over spunnnn racey motor.....broken crank...keep telling.....I wan to know.........

  10. #23
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    Everyone ive seen broken waa run like it was a two liter.

  11. #24
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    which is part of the reason so few still exist in a nutshell...

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  13. #25
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    they tried a few ski racing in OZ bit didnt go any faster then the current v6's at the time.

  14. #26
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    Sitting in a meeting one day the talk got around to the 3.4 - new guy asked one of the engineers in the meeting what kind of hp did they ever produce? Engineer whose name I have forgotten, and English guy, said the big bore EFI's could produce 450 on the dyno. New guy's reply "That's insane!"

  15. #27
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    HeeHee....Cut the crank/// lighten the rods....damm ....If only I was with Merc at the time.....Put more c bolts to keep maines..... tight....just Me,,,,,

  16. #28
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    Quote Originally Posted by bernie View Post
    The T-4/ 3.4 competed in the consumer market with sterndrives - so it was Mercury against MerCruiser basically. The 3.4 was lacking a few things, and I am talking the consumer engines.
    1, Drop on cowl system
    2. Intregal power Trim
    3. EFI
    4. Ortional gear ratios
    5. Propeller line
    And probably a few others that slip my mind. I was on the 3.4 task force to work on this stuff but by then the 3.0 was in development and all resources when to that family. So ended the 3.4.
    ...You forgot steering, lol. Kinda agree about props. Needed a couple "Mercury" brand props for it. Aftermarkets were there, but... Even when the 3.0 came out, it wasn't EFI right away. What was it, '96 Merc's went EFI, including most MerCruisers? Trim system existed that could handle the abuse. It was used. Different gear ratios? Eh, yeah, maybe. Props would have done the trick. What? You didn't like the clam-shells?

  17. #29
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    Clamshell cowl on twin rigs..ahh

  18. #30
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    The #8 ssm was really cool. Very very few around.

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