6BTM or locked out timing?

Forced Induction Mopar

  1. Ccrussell

    Ccrussell FABO Gold Member FABO Gold Member

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    Hello,
    I am still collecting parts for my 225 turbo build.
    Now i am at a point of wanting to select my ignition control.
    I currently run a stock distributor (1972)with pertronix module.
    Will a 6BTSM work with the stock distributor? I have an available dizzy from a later slant, 1978 i believe or can i just lock out the distributor to 18 degrees? How is the distributor locked out, i havent seen a procedure as to how to do this but am still searching. Car will be street driven always with some highway use.
    Money is of concern, but i will spend it where it makes good sense. Thanks

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    • Rolling_Thunder

      Rolling_Thunder Rolling Thunder

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      I'm not too familiar with your plans - but do you have a management system picked out yet? Going EFI or keeping carb? Most EFI systems utilize spark control and at that point a locked out dizzy allows the ECM to do all timing adjustments.
       
    • Ccrussell

      Ccrussell FABO Gold Member FABO Gold Member

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      Hello Rolling_Thunder,
      I should have mentioned it, i am using a Holley 500cfm two barrel blow thru with hanger 18 mods.
      Intercooler, boost reference fuel pump with return line .
      O2 sensor.
       
    • subcom

      subcom Well-Known Member

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      I'm not very familiar with the guts of the S6 distributors but I have to imagine that they are similar to their v8 cousins in that they have springs and weights that control the timing curve advance and those are the components that must be "locked" in order to fix your timing at a particular setting. That would be the cheapest route. Locked distributor at 18 degrees and just sacrifice some streetability. Also, you could look for a "lean burn" slant distributor. Those don't have weights or springs and are essentially "locked" from the factory. How built is your Slant? Is it a forged assembly stock?
      Best of luck with the project!
       
    • halifaxhops

      halifaxhops It's going to get stupid around here! FABO Gold Member

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      Actually pretty easy, weld the cam stop to the top of the weights and what I do to get rid of the vac is take it off and then drill a hole through the base plate and tap it 10/32 and install a screw.
       
    • Ccrussell

      Ccrussell FABO Gold Member FABO Gold Member

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      Ok then, set just 18• base timing with a timing light, after those small mods? Is it that easy? I should look at my later distributor, it may be suitable without modification.
      The motor itself is completely stock. About 130k miles on it, runs nice, uses no oil.
      Thanks for tips
       
    • Burlapen

      Burlapen Well-Known Member

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      The msd btm is well worth it for street driving. I used one on my turbo 4 door build.
       
    • RustyRatRod

      RustyRatRod 30 Degrees Outta Whack FABO Gold Member

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      If you can post up some info on the 6btassmBeavis, we'll be better prepared to answer your question. I never heard of the damn thing.
       
    • Burlapen

      Burlapen Well-Known Member

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      It’s an MSD box that has a boost reference line. You can adjust a dial to remove X degrees of timing per pound of boost. That way it drives completely normal when you’re not into the boost. I used mine with my stock electronic Mopar distributor in the 318. Don’t see why it wouldn’t work with a slant six dizzy.
       
    • RustyRatRod

      RustyRatRod 30 Degrees Outta Whack FABO Gold Member

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      Thanks man. If the OP wants some help on it, he needs to post up some specs on it. When asking questions and wanting help, if people have to look for answers that should have been posted the first time around, that lessens the chances for a good discussion and a good answer. So some more info is necessary here.
       
    • Burlapen

      Burlapen Well-Known Member

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      https://www.theturboforums.com/thre...stock-318-twin-turbo-running-02-24-12.359972/

      Here is a link to the SUPER low buck turbo valiant I build years ago. Definitely down and dirty. Junkyard turbos, boost referenced mechanical pump etc. Wish I still had it but it ended up oversees somewhere. Even though the BTM cost a bit (I got a used one off of craigslist) it was well worth it for driveability. PS, I don’t think the forced induction section existed on forabodiesonly back then
       
    • Ccrussell

      Ccrussell FABO Gold Member FABO Gold Member

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      Hello,
      Yes perhaps i should have posted more information on the Msd timing master. It is on this site where i first learned about it, so i made the presumption that everyone knows about it.
      Rusty rat rod if you dont know about it then how would you have weighed in on it anyway? Dont take it personally but if you dont know what it is why then would you comment on it?
      This is a trial run into turbocharging, if it works out well, i am going to want something with larger displacement to do the same to. Hoping to cut my teeth on a motor ive already got.
       
    • Charrlie_S

      Charrlie_S Well-Known Member

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      For a street driven car, you do not want fixed timing. Most street driving, is done "off boost", so why set up the ign timing for the small amount of time you will be on boost. Performance and fuel mileage will suffer. Spend the money for some kind of boost timing control.
       
    • RustyRatRod

      RustyRatRod 30 Degrees Outta Whack FABO Gold Member

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      Because I know how to look at a wiring diagram. Been a mechanic since 1974. Because I'm not green behind the ears. Don't sweat it though man. I can help somebody else that's more appreciative that I even tried.
       
    • sireland67

      sireland67 Well-Known Member

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      I am pretty sure I have a lean burn s6 distributor.
      I will let it go cheap, I do not have any s6 anymore.
       
    • Ccrussell

      Ccrussell FABO Gold Member FABO Gold Member

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      RustyRatRod,
      Brother i meant no offence to you or your abilities. I am sure you are competent in what you do. You clearly have thousands of posts.
      I read what MSD claims the boostmaster can do.
      I was looking for someone who would comment on the component in question and say “yes money well spent”, or “no dont bother this is a better or less expensive alternative. After searching further, there was someone who built a device on their own based on O.E.components , which was suitable for pulling out 5 degrees of timing during boost.
      Clever but not what ultimately what i will need.
      Thanks for all who posted.
       
    • T56MaxTorq

      T56MaxTorq Well-Known Member

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      I’d like to mention that if you’re not even going past 6 lbs of boost, you may not even need to lock out the distributor or even run the btm. Set total time to 30* and walk away. As long as you’re not running on a razors edge of high compression and/or questionable afr.
       
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