I've been playing around with my vacuum line configuration. Until today my vacuum advance was connected directly to the manifold vacuum port. It had about 19 or 20 lbs of vacuum at idle and low rpm and the throttle had good response.
Okay today I connected the vacuum advance to the upper two port thermal vacuum switch with vacuum sourced from a ported vacuum port on the carb. No vacuum at idle and no more than maybe 5 lbs under throttle.
I'm pretty sure my thermal vacuum switches operation is questionable. Only God knows how long it's been since it was connected to anything, but that's beside the point of my post.
I understand that limiting the vacuum advance will cause the engine to run hotter and thus warm up faster. Anyhow after my test drive about 5 miles or so I shut it off and noticed a clicking noise almost like the sound of an aluminum engine cooling down. After further inspection and getting out my stethoscope I determined the sound is coming from the EGR valve. I'm not kidding it sounds like a clock ticking, lol. The EGR valve has been disconnected since I bought it.
I am curious if anyone else has any idea about the cause of this noise.
The lack of additional timing has obviously raised the exhaust temp, but I have no Thermactor Pump or a catalytic converter to take advantage of it.
Thanks,
Collins
Okay today I connected the vacuum advance to the upper two port thermal vacuum switch with vacuum sourced from a ported vacuum port on the carb. No vacuum at idle and no more than maybe 5 lbs under throttle.
I'm pretty sure my thermal vacuum switches operation is questionable. Only God knows how long it's been since it was connected to anything, but that's beside the point of my post.
I understand that limiting the vacuum advance will cause the engine to run hotter and thus warm up faster. Anyhow after my test drive about 5 miles or so I shut it off and noticed a clicking noise almost like the sound of an aluminum engine cooling down. After further inspection and getting out my stethoscope I determined the sound is coming from the EGR valve. I'm not kidding it sounds like a clock ticking, lol. The EGR valve has been disconnected since I bought it.
I am curious if anyone else has any idea about the cause of this noise.
The lack of additional timing has obviously raised the exhaust temp, but I have no Thermactor Pump or a catalytic converter to take advantage of it.
Thanks,
Collins