baccaruda Posted October 28, 2003 Share Posted October 28, 2003 I'm using my 86 GL10 vacuum advance disty in the 87 XT engine I'm putting in my car. Do I need to choose a specific source for the vacuum or will anyplace I can tap into be OK?? thanks Link to comment Share on other sites More sharing options...
baccaruda Posted October 28, 2003 Author Share Posted October 28, 2003 bump Link to comment Share on other sites More sharing options...
Guest taprackready Posted October 28, 2003 Share Posted October 28, 2003 Maybe comparing apples and oranges. But, when I stripped out my manifold on my 82 brat and changed from Carter onebarrel to Hitachi Two barrel I didn't hook the vacuum advance to the ported vaccum on the carb. I used full manifold vacuum off of the manifold. I've had no problems and the brat pulls strong with good low end torque and no pinging. Bill Link to comment Share on other sites More sharing options...
Qman Posted October 28, 2003 Share Posted October 28, 2003 Vacuum should increase with RPM's. That is what gives the proper advance to the distributor. Link to comment Share on other sites More sharing options...
Guest taprackready Posted October 28, 2003 Share Posted October 28, 2003 Originally posted by Qman Vacuum should increase with RPM's. That is what gives the proper advance to the distributor. I'm not debating your comment but I've checked the driveability and power with ported and manifold vacuum and the brat runs better with manifold vacuum. Besides, at fairly low RPM's, vacuum drops off anyway and its all mechanical advance has kicked in. At about 2500 RPM's the advance is topped out. Bill Link to comment Share on other sites More sharing options...
Guest taprackready Posted October 28, 2003 Share Posted October 28, 2003 Check out this article. It will help you figure out what is best for your particular combo. http://www.chevytalk.com/tech/ignition/Timing_Advance.html Bill Link to comment Share on other sites More sharing options...
baccaruda Posted October 29, 2003 Author Share Posted October 29, 2003 thanks Link to comment Share on other sites More sharing options...
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