Slant Six Forum :: Found "The" problem!

At least MSI is not more sensitive to voltage fluctuations, but probably less than orange box type stuff. I think it will run on 10V or something in that range. I have been running an old style 69-down voltage regulator and it drops down low in V fairly frequently. It does occasionally die when very hot and recently started, and I drop it into gear, but I have attributed that to the lean heat soak condition (overheated injectors, I believe). I may check for voltage drops too or try a later V reg.

Lou

Author:	Dart270 [ Fri Sep 28, 2012 5:24 am ]
Post subject:
At least MSI is not more sensitive to voltage fluctuations, but probably less than orange box type stuff. I think it will run on 10V or something in that range. I have been running an old style 69-down voltage regulator and it drops down low in V fairly frequently. It does occasionally die when very hot and recently started, and I drop it into gear, but I have attributed that to the lean heat soak condition (overheated injectors, I believe). I may check for voltage drops too or try a later V reg. Lou

Author:	Slanted Opinion [ Fri Sep 28, 2012 8:16 am ]
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Sam, it may be worthwhile to check for voltage drops within your electrical system. Here is an easy test: - Meter set to read DC voltage - Plus lead connected to output stud on alternator - Negative lead connected to Positive terminal on battery. The reading (if there is one) will represent voltage drop between the two points. You can also go from the Negative Terminal on the battery to the case of the alternator. Want to know if your wires are handling the loads you have now? A voltage drop check would be a good indication. Going from the negative terminal on the battery to the ground connection on any device in your system will tell you immediately if that device has a good ground. I would imagine that these one-wire alternators would be sensitive to voltage drops within your electrical system. - Mac

Author:	Sam Powell [ Fri Sep 28, 2012 9:04 am ]
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Quote: At least MSI is not more sensitive to voltage fluctuations, but probably less than orange box type stuff. I think it will run on 10V or something in that range. I have been running an old style 69-down voltage regulator and it drops down low in V fairly frequently. It does occasionally die when very hot and recently started, and I drop it into gear, but I have attributed that to the lean heat soak condition (overheated injectors, I believe). I may check for voltage drops too or try a later V reg. Lou Lou, watch your vacuum gauge when it dies. Sometimes when vacuum drops, the timing will drop, thus killing the engine. Are you sure your distributor is seeing ported vacuum and not manifold? Sam

Author:	Dart270 [ Fri Sep 28, 2012 1:19 pm ]
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Good thought, but I am running a locked dist with the MSD 6AL-II so there is no ported vacuum or ign advance drop issue. It only happens after heat soaking and restarting and I am pretty certain it is fuel injector related. Lou

Author:	Sam Powell [ Fri Sep 28, 2012 6:57 pm ]
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Is advance in MSD box tied to RPM or map signal? If so then the timing still could be dropping down when you put it into gear. Just a thought. Sam

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Author:	Dart270 [ Sat Sep 29, 2012 4:21 am ]
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Yes, both RPM and MAP, but I have the timing map set up so it should never drop below 13 deg. Thanks, Lou

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