Timing cruve with MSD distributor
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Timing cruve with MSD distributor

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    Senior Member bwurst1's Avatar
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    Default Timing cruve with MSD distributor

    Can someone tell me what the benefits are (if any) To "locking out" the mechanical advance in a MSD Pro billet distributor? When would you want to do this? I'm running A BBC with a 6-71 and according to MSD my old distributor wouldn't come into full advance until 4500rpm. My 660 times were always slow but picked up on the top-end. If I locked out the timing I'm thinking this would help with the that? Am I crazy? It makes sense to me just not sure if doing so will damage anything. Or would it be better to set up the distributor with the lightest springs and biggest bushings to get full advance at about 2500rpm?

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    You want the lightest springs. All in , 24* at 2,000. Real quick curve. You won't need the vac. advance, block it off.

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    Quote Originally Posted by bwurst1 View Post
    Can someone tell me what the benefits are (if any) To "locking out" the mechanical advance in a MSD Pro billet distributor? When would you want to do this? I'm running A BBC with a 6-71 and according to MSD my old distributor wouldn't come into full advance until 4500rpm. My 660 times were always slow but picked up on the top-end. If I locked out the timing I'm thinking this would help with the that? Am I crazy? It makes sense to me just not sure if doing so will damage anything. Or would it be better to set up the distributor with the lightest springs and biggest bushings to get full advance at about 2500rpm?
    If this is in a jet boat I would lock it out. They come up so quick un like a v-drive or outdrive that the load is not a problem. I think you will find it starts better & runs cleaner down low.

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    As said depends on drive system. You want your advance in as early as posible. I have never seen it as late as 4500. The only reason for advace is to ease starting and to help prevent preignition during engine acceleration under heavey load. So yea what maxi said

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    If you lock you won't have to time it again unless you remove the dist. The springs wear and the weights wear.

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    Great Feedback thanks guys! Yes its a jet 19' Nordic tunnel to be exact. I'm going to try it locked out. see what happens..

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    Quote Originally Posted by bwurst1 View Post
    Great Feedback thanks guys! Yes its a jet 19' Nordic tunnel to be exact. I'm going to try it locked out. see what happens..
    you'll be better off as long as you can get it to start without kicking back. If not then as little mech advance as possible and have it in as soon as possible. my.02
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    Quote Originally Posted by Hass828 View Post
    you'll be better off as long as you can get it to start without kicking back. If not then as little mech advance as possible and have it in as soon as possible. my.02
    Or wouldn't a start retard box do the trick?
    I have noticed that MSD dizzy's seem to have a very tight setup out of the box!


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    Quote Originally Posted by Widetrack View Post
    Or wouldn't a start retard box do the trick?
    I have noticed that MSD dizzy's seem to have a very tight setup out of the box!
    If his box has that option then yes, but I wouldnt buy another box just for that. Not to mention that the site has a few posts with people having issues with all that crap.
    I've see elect. distributors come out of the box with 24* of mech advance and pretty stiff springs that dont allow it all in till 3500rpm or so.
    It would work fine with 12* of advance and it all in just above idle, but this is on a higher comp. deal with kickback problems. The OP has a 6-71 blower on gas so he's probably 8.5-1 comp. It should start fine just locked out.
    Last edited by Hass828; 08-04-2011 at 10:45 AM.
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    My box is a 6al. Unsure if it has the option for a buzz box. Is that for a timing retard? I saw some devices that allows for timing changes that work with different boxes. Yes its gas, 110 always. Compression is 9-1 I run the blower @ 11.7 over making 10/11lbs. @ 6000rpm.
    Last edited by bwurst1; 08-04-2011 at 12:08 PM.

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    No one is talking about a buzz box. They're talking about a timing retard for the start. As Hass stated, there have been issues with MSD retard devices, but that is more in the devices trying to control the running timing. This thing is a little simpler in that it retards your set point 10 or 20 degrees only on the start and then reverts to the timing you set. But you shouldn't need it if you have a good battery and starter on a pump gas motor.




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    Ya that's the box I was taking about.Sorry your right GN good catch. Some one mentioned a MSD dizzy. Thats what I was taking about whether or not my box was capable of the upgrade. So when would one of those timing retard boxes be needed?
    Last edited by bwurst1; 08-04-2011 at 02:19 PM.

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    That box will work with a MSD 6, but I would use one usless you need it. Like I said, a good battery and starter will fire off a 10 to 1 engine with no trouble. I have never used one and have used locked out dizzies on 12 to one motors with no problems. Just another thing to fail if you don't need it.



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    Great tip thanks

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