Optispark rotor sound
Optispark rotor sound I put an msd cap and rotor on my original ac delco optispark. I loctited the rotor screws and when i put it together everything seemed to clearance well. After i got it all back together and sealed it up with the seals and rtv i spun the opti by its shaft and noticed i could hear the rotor spinning in it. I dont hear scraping but im thinking maybe its because of the air it displaces when it spins? Anyone else spin there opti and hear noise?
TECH Veteran
Joined: Apr 2008
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I have OEM opti with MSD C&R...no noise when I spun the shaft
You sure you got the plastic plate/disc under the rotor on right. if the large O ring for the cap is not set right the cap won't sit flush and the rotor would be rubbing against it or the plastic disc under it.
You sure you got the plastic plate/disc under the rotor on right. if the large O ring for the cap is not set right the cap won't sit flush and the rotor would be rubbing against it or the plastic disc under it.
I also have an MSD cap/rotor on a stock base. I experienced the same thing, and it's the ribs molded into the inside of the MSD cap. In my case, they were actually wearing grooves into the rotor. I ground them down with a dremel.
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Joined: Apr 2008
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any cap to rotor interference is not good. The plastic shavings that collect can cause problems
IIRC the MSD C&R kit comes with two large O rings for the cap. One round and the other square IIRC. I can't remember which one I used but did notice it had a tendency to come out of the groove on the base so I hand "stretched" it some and then put it on and then quickly put cap on before the O ring constricted and popped out of the base
I would think if not using the large O ring than the cap & base would sit closer together.
IIRC the MSD C&R kit comes with two large O rings for the cap. One round and the other square IIRC. I can't remember which one I used but did notice it had a tendency to come out of the groove on the base so I hand "stretched" it some and then put it on and then quickly put cap on before the O ring constricted and popped out of the base
I would think if not using the large O ring than the cap & base would sit closer together.
Every good opti I've ever encountered has never made any sound. I did try my luck at Autozone with an opti. Spun it and it made a horrendous rubbing noise. Told them I couldn't accept it.
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