Okay, When installing a Opti spark, what measurements, after a new cam, timing chain, cover or whatever, should you take to ensure as little possible breakdown.
Its strange how a Opti survives in a stock motor for so many years for some, even when hiting redline occasinally, but when someone modifies there motor, there seems to be more breakdowns. Why? Several Builders here should have some insight.
I am looking at Dowel Pin lengths, possible camshaft problems(hole for opti not right size causing looseness?, camshaft bolts not fitting fluch inside Opti casuing problems, dowel pin banging the opti becauses of thrust loads. Who knows.
I have had several break within a year. Different cams, different timing chains, same cover, different valve springs, and raised my shift points to 6300rpm from 5800rpm.
There have been several thousand Opti discussions. But we need to ensure we cover everything mechanical we can. Thanks, lets see if something can be enlightened.

 

If it has "LT1" or "Optispark" in the topic, there's a good possibility it should have been posted on "LT1/LT4 Engine Tech"..... moving post there.

 

I figured it was beyond the basic tesch, and someone here has gone deeper into troubleshooting than the basics.

 

ttt

 

The only measurement you can take is the dowel pin on the cam.. its really all that matters.

Probably the single greatest reason optis break on high hp motors is because the rapid increase in RPMs can fling the copper contact off the rotor. That is what happened to mine.

 

The dowel pin is not really critical on a 93 or 94. The only thing you have to make sure of, is that it does not contact the timing cover.

 

I am useing the DELTEQ system, and I think the last breakage, since it doesnt run now, I think the rotor broke up and damaged the sensor that the DELTEQ uses.