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-   -   No Power?? (https://classracer.com/classforum/showthread.php?t=40308)

Ed Carpenter 04-18-2012 09:20 PM
No Power??
 
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Pvt Parts 04-18-2012 09:25 PM
Re: No Power??
 
Quote:
Originally Posted by deuces wild (Post 322291)
Ok tried again. New battery. This engine acts like it has no power. Sounds awesome in the pits,in the water, and on the starting line. Dump the clutch and it kills it. Won't pull any rpm. Checked everything. All checks out. Only thing I changed over winter was I had pat redo mad box. Ideas??????

Maybe at this point some dyno time might be a good investment.????

Alan Roehrich 04-18-2012 09:34 PM
Re: No Power??
 
Quote:
Originally Posted by deuces wild (Post 322291)
Ok tried again. New battery. This engine acts like it has no power. Sounds awesome in the pits,in the water, and on the starting line. Dump the clutch and it kills it. Won't pull any rpm. Checked everything. All checks out. Only thing I changed over winter was I had pat redo mad box. Ideas??????
Is that supposed to be "MSD box"?

Alan Warman 04-18-2012 10:03 PM
Re: No Power??
 
Ed
What did you find wrong with the motor. When I talked to you in San Antonio, you said the leak down and the compression test didn't look good.

Ronald Urquhart 04-18-2012 10:21 PM
Re: No Power??
 
I had a problem like that years ago when I had my chevy ll after weeks of tearing my hair out turned out to be a bad msd box. It didnt miss breakup just no power going down the track.

Jeff Lee 04-19-2012 02:08 AM
Re: No Power??
 
A really bad ground? New MSD box incorrectly wired on installation? Can you borrow another box after you check your grounds and installation?

jim morgan 04-19-2012 07:39 AM
Re: No Power??
 
Replace pickup with a known good one. better yet put new one on.

Sean Marconette 04-19-2012 08:39 AM
Re: No Power??
 
Is there a chance that the polarity to the distributor pickup was switched? That is all it takes to do some strange things with the MSD. The car will run fine, until going down the track, and then it will act like the rev limiter has been lowered. Good luck.

Sean

Stephen & Horace Johnson 04-19-2012 10:43 AM
Re: No Power??
 
Quote:
Originally Posted by jim morgan (Post 322344)
Replace pickup with a known good one. better yet put new one on.
I agree with Jim, change the pickup. we had that same issue at a race a few yrs ago and change the pickup and the car ran fine!!

Bob Mulry 04-19-2012 11:49 AM
Re: No Power??
 
Just some random info about MSD's & other high current draw parts...............

The MSD 7AL depending on the resistance caused by the plug gap, high compression, rotor gap, sparkplug wires, load, RPM and anything else that makes it more difficult to fire the plug will raise the amperage requirement for the box.

Your power supply wiring should be capable of passing 15 amps on the positive AND negative side.....

All wiring connections should have crimp fitting (mechanical connection) and be soldered (electrical connection) and be covered with shrink tube to prevent corrosion.....

You MSD box will work perfectly until you the reach the point of needing more amps than your wiring can supply...

Had the same type of problem with a MSD 404 box 40 years ago and learned my lesson regarding resistance in the power AND ground side of wiring..

In the words of Stroker McGurt "If some is good, more is better and too much is just right"

Hope this helps,
Bob


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