MSD Pro Mag, help needed
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MSD Pro Mag, help needed

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    Senior Member Ahsumtoy's Avatar
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    Default MSD Pro Mag, help needed

    I have a blown alcohol jet using a MSD Pro Mag 12amp generator and an 8106 points box. The boat is not a race boat, just a "hotrod" I use on the river. The boat and engine are all brand new parts. After putting the boat in the water a couple of times to shake down everything, with no issues, I decided to try a full pass. At 7800 rpms, maybe 800 feet, the engine shut-off, with no signs of any problems from the tune-up. The engine would not refire after it shut-off. Norm Grimes sent the mag and points box back to MSD for testing, and they said everything was okay. At this point I'm guessing it's an electrical/wiring problem. I am suspecting the kill switch, which is not the supplied switch from MSD. When I tested the switch it seems okay, opens and closes to ground. I'm not to excited about getting back in this thing without knowing if the problem is fixed or not. Any idea's??

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    gn7
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    right off have you tried the unit after getting it back? or are you just assume something else has to wrong. On more than one occasion MSD has sent back units saying nothing was wrong but the motor fired right back up when reistalled. I think it's their little way of saying there stuff doesn't fail. Seen them do this on units 5-6 yrs old and no charge, just postage.



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    Senior Member Ahsumtoy's Avatar
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    No I haven't installed it yet. However, if it does start how do I know the problem isn't something else, like a wire shorting out or the kill switch jumping and shuting it off? I would almost rather it didn't start so I know the problem is still there, assuming the mag is good. The idea of running this thing 130 mph and having it shut off again really worries me. I'm considering switching to a mallory super mag and changing out all of the wiring and kill switch.

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    Senior Member Morg's Avatar
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    I had the exact same thing happen to me at the river last year. A wire was tight against a corner & wore through , it was the kill switch ground wire. Grounded & shut off.

    Check all your connections, check all your wires, check your kill switch.

    Find a buddy with a v-drive that has a whirlaway in it. They don't care as much if they shutt off at WFO.

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    Senior Member Morg's Avatar
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    Quote Originally Posted by gn7 View Post
    right off have you tried the unit after getting it back? or are you just assume something else has to wrong. On more than one occasion MSD has sent back units saying nothing was wrong but the motor fired right back up when reistalled. I think it's their little way of saying there stuff doesn't fail. Seen them do this on units 5-6 yrs old and no charge, just postage.
    Word up on this.

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    Senior Member Ahsumtoy's Avatar
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    Quote Originally Posted by Morg View Post
    I had the exact same thing happen to me at the river last year. A wire was tight against a corner & wore through , it was the kill switch ground wire. Grounded & shut off.

    Check all your connections, check all your wires, check your kill switch.

    Find a buddy with a v-drive that has a whirlaway in it. They don't care as much if they shutt off at WFO.
    Good idea! Changing out the wiring and kill switch is easy. I'm thinking put the mag and points box back in, try starting it and hope it doesn't. Then change the wiring and kill switch and hope it starts..... Then I can feel like I eliminated the problem.

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    adjones419 Wet-n-Wild's Avatar
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    Quote Originally Posted by Ahsumtoy View Post
    I'm considering switching to a mallory super mag
    Bad move! There are magnetos, and then there are Pro Mags. We had a terrible detonation/timing issue with a Super Mag 4 on a blown-injected alcohol 572 BBC in a ProMod hydro. I just ordered a Pro Mag 20 for my new blown alcohol bullet, and I think it will be a lot better than the Super Mag. MSD Pro Mags don't use points, where the Super Mags do. I know of ProMod and Top Alcohol guys running the Pro Mag 12's. That should be a great mag for you.
    Adam
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    B1 Racing cs19's Avatar
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    Bad ground? Make sure your not grounding on any anodizing, I think I remember seing alot of anno on your boat.
    B1Racing.net

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    I know Pat Eason had issues this past weekend on the Kboat with a MSD mag (getting it fired on a new motor after he broke a crank in the first one). They never did get it fired after jacking with it for a couple hours.

    I don't know if the problem is wiring (I suspect) or the mag. They switched boxes and all the other stuff and never did fire.

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    Senior Member Ahsumtoy's Avatar
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    Quote Originally Posted by Rexone View Post
    I know Pat Eason had issues this past weekend on the Kboat with a MSD mag (getting it fired on a new motor after he broke a crank in the first one). They never did get it fired after jacking with it for a couple hours.

    I don't know if the problem is wiring (I suspect) or the mag. They switched boxes and all the other stuff and never did fire.
    I had problems firing the motor the first time also. The Pro Mag's require a minimum of 200 rpm cranking speed to work. I was using a Tilton starter and it would not turn the motor fast enough. I got a starter from Mike Dunn, (the Texas Mike Dunn), that had one additional tooth on the pinion and that fixed it. MSD also suggests using a 16 volt battery to crank it faster.

    Chris, regarding the anodizing, actually all of my rigging is powdercoated which is worse than anodize. However, I knew that so I was careful to ground everything to the block. Mike Porter had a similar problem with his motor shuting off with his MSD Mag and fixed it by grounding the points box to the block. But when Mike's shut off he could let it sit for a while and it would re-start, not mine!

    Rexone, I saw your comments on the other MSD thread suggesting that the problem may be installation, grounding, etc. The wiring on the Pro Mag is almost fool proff. MSD plugs, factory installed, connect the points box to the mag. One wire grounds the points box to the block. One wire through the kill switch to ground. That's it! However, I'm not discounting the ground to the kill switch, or the kill switch, that's my guess.
    Last edited by Ahsumtoy; 03-04-2008 at 05:46 AM.

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    Jackwagon Patrolman Rexone's Avatar
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    Quote Originally Posted by Ahsumtoy View Post
    I had problems firing the motor the first time also. The Pro Mag's require a minimum of 200 rpm cranking speed to work. I was using a Tilton starter and it would not turn the motor fast enough. I got a starter from Mike Dunn, (the Texas Mike Dunn), that had one additional tooth on the pinion and that fixed it. MSD also suggests using a 16 volt battery to crank it faster.
    I know they tried switching batteries to a 16v and changed the starter going right down the road you outlined on the spinning fast enough. The motor sounded like it was spinning plenty fast (faster than some others) but still no spark detected. I'm sure it will be something basic when it does get sorted out... usually is.

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    21 Daytona Outlaw's Avatar
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    Quote Originally Posted by gn7 View Post
    right off have you tried the unit after getting it back? or are you just assume something else has to wrong. On more than one occasion MSD has sent back units saying nothing was wrong but the motor fired right back up when reistalled. I think it's their little way of saying there stuff doesn't fail. Seen them do this on units 5-6 yrs old and no charge, just postage.

    Ditto on this , I have never been charged to repair anything.
    it allways comes back "No Problems Found" works fine after getting it back.

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    Gone
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    Mags I run are Vertex and Supermag. Never ever.....had an igntion problem. I do carry a spare tho. I loan it to people at the lake with ignition problems. And I carry it because Morg is trying out an MSD mag.

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    Senior Member Ahsumtoy's Avatar
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    Quote Originally Posted by Outlaw View Post
    Ditto on this , I have never been charged to repair anything.
    it allways comes back "No Problems Found" works fine after getting it back.
    That would really suck if they did that. What's at stake here is someone's life! If I just stick the thing back on, go out and make a 130+ mph pass and it shuts off again, I could die! This isn't a car that will just coast to a stop. Also, if they fixed something that had gone bad, after using twice, whats to say it won't go bad again? I'm still thinking Mallory Super Mag. I used one on my last alcohol boat and I never had any issues. The guy that owns it now runs the piss out of it and he has never had any issues either. That boat is now eight years old.

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