Quote:
Originally Posted by mysocal911
Where are the data, e.g. dyno tests, you were promising months ago to prove that other CDIs
provide more performance than the Bosch CDI?
"All of the other posters advice is valid on the power wire for the MSD. It can draw over 5 amps at times and needs a dedicated connection."
Actually, it can draw over 10 amps that's why the EXTRA power connection!
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I NEVER promised dyno tests. I did do bench tests comparing the Bosch to CD-1 and posted the results. And again my own driving experience with 120,000 miles of driving my 911 stock, then with Pertronix, then with the CD-1 igniton demonstrates to ME, a huge improvement.
I am not planning any dyno tests.
Here is the bench testing I did:
I did a bit of test on the stock Bosch CDI and the Daytonal Sensors CD-1 ignition.
The test setup was basic. I used a MSD spark generator which basically is a square wave generator with a digital read out of RPM. It simulates what points or a hall effect ignition setup like a Pertronix will put out. I fed this signal into the points wire in the Bosch [black wire]. For the Bosch I used a transformer E coil made by Nology it is called a ProFire and has part # PFC-M75. I have been using this coil on my 1973 2.7 MFI motor for years. It is designed for CDI.
I used Lisle 50850 Ignition Spark Tester that has an adjustable gap and a big alligator grounding clip. I set the gap to 10mm. This means that the unit under test is just one "spark plug" with a big gap.
I powered this CDI with a 500 Watt 12 VDC power supply that was able to supply 12 vdc through out the test.
To test voltage I used a General Technology Corporation TA 100 tachometer and engine analyzer. This unit can read RPM wirelessly and can read voltage by wrapping around the plug wire that comes from the center of the coil. I measured at the end of the wire closest to the spark gap tester.
This tester holds a max and min reading of each test.
With this set up I got the following results on the Bench
Bosch 3pin CDI part # 0 277 200 001
1000 RPM 10mm gap 32.4 Kv
5000 RPM 10mm gap 43.8 Kv
7100 RPM 10mm gap 41.5 Kv
DAYTONA-SENSORS CD-1
1000 RPM 10mm gap 94.7 Kv
5000 RPM 10mm gap 88.2 Kv
7100 RPM 10mm gap 81.3 Kv
the Bosch would occasionally "flame out" at 7100 RPM.
Remember I am firing 1 "plug", but 10mm is a HUGE gap to fire.
I did not have an MSD. I would imagine it would do better than the
Bosch. I do know the CD-1 135 Mj [milli joule] of spark energy output.