3406b turbo upgrade???

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by 704mover, Mar 8, 2018.

  1. 894964f

    894964f Light Load Member

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    Thanks for the info. Are these engines typically not a real smooth engine at 1700 plus RPMs?
     
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  3. Oxbow

    Oxbow Road Train Member

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    I have always felt that they are quite smooth up to 2100. In my experience the power starts to fall off above 1800.

    I wonder if you are due for a new vibration dampener?
     
    Last edited: Sep 1, 2018
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  4. spsauerland

    spsauerland Road Train Member

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    I agree with @Oxbow. My 7FB is smooth all the way through. Varys with governor springs when fuel starts cutting back. What is Max rpm no load in neutral?
     
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  5. spsauerland

    spsauerland Road Train Member

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    I'd go with a viscous damper if it has old rubber one on it.
     
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  6. wore out

    wore out Numbered Classic

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    Both my B models are smooth. My 86 is a 7FB my 91 is a converted PEEC with a 7fb pump. Like @Oxbow said you can twist them up but they don't pull well till they fall to 1800 or so. I am gonna say damper or timing if it's got some shake in it
     
  7. 894964f

    894964f Light Load Member

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    Good info. thanks. Any damper better than the other? it does have what appears a damper with rubber

    SP, max rpm in neutral is about 2000rpm.
     
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  8. spsauerland

    spsauerland Road Train Member

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    Should be around 2300 with a good known tach. Sounds like might be a 1800 RPM governor spring. We can look it up by s/n if you want.
     
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  9. 894964f

    894964f Light Load Member

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    Sure u need the serial#4mg38299
    Tag says bare engine high idle 2326rpm, full load rpm 2100.
    This a decent model b?
     
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  10. wore out

    wore out Numbered Classic

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    Should be absolutely.
     
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  11. spsauerland

    spsauerland Road Train Member

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    Here are test results and performance data to give you idea on exhaust temps from pyro to manifold difference. It is run of the mill 425/1450 with 2332 RPM no load/2100 RPM load. Good ol workhorses that I would take over a new emissions crap any day of the week! Vibratech seems to be a good damper. Made in the USA. Put a viscous one on it.
     

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