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Registered
Join Date: Apr 2008
Location: Alberta, Canada
Posts: 12
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Burnt ignition rotor
I have a 77 911S- 2.7L.
The engine has a miss at idle and sometimes I hear a kind of rattling sound from inside the distributor...especially if Im adjusting the timing. There is very little play in the distributor shaft. I took a look inside and found a rev limiter type rotor. There seems to be a hole burnt in it close to where the tip discharges...looks like there was some kind of epoxy covering a wire that leads to the contact lead. I checked with my ohmeter and I do not have continuity between the discharge contact tip and the center contact Anyone seen this before? 
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06-14-2009, 07:44 PM
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Max Sluiter
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There is a resistor in the rev limting rotors. When you use high-performance ignition systems with higher voltage, the resistor heats up too much, burns, and melts the rotor. Dig out the resistor and solder in a piece of stout, high-quality wire.
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance |
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06-14-2009, 09:25 PM
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Wer bremst verliert
Join Date: Jan 2005
Location: Toronto, Ontario
Posts: 4,767
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Search on "rotor" and "modification" its well-documented here.
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2007 911 Turbo - Not a toy 1985 911 Cab - Wife's toy 1982 911 3.2 Indiash Rot Track Supercharged track toy 1978 911 3.0 Lichtbau toy "Gretchen" 1971 911 Targa S backroad toy |
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06-14-2009, 10:41 PM
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Almost Banned Once
Join Date: Feb 2009
Location: Adelaide South Australia
Posts: 38,346
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What ignition are you running? MSD, Stock... or other???
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- Peter |
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06-14-2009, 11:12 PM
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Registered
Join Date: Aug 2004
Location: Houston, TX
Posts: 895
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Also, someone is going to post to use the 912, non-rev limiting rotor. This is still a RESISTOR rotor. The 911 and 912 both spec out at 5K ohms. I was just in the parts shop with my multi-meter last weekend, checking them all out. I ended up having to do the rotor mod...
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Matt 72 911T Targa - Sold Hang up the cell phone. Put down the Latte. Ignore the kids in the back seat. Use your blinker when you want to change lanes. AND DRIVE YOUR Fu@#!NG CAR!! |
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06-15-2009, 06:02 AM
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1971 Porsche 911S
