Originally Posted by
deeretech
I was kinda curious about the VCV (if i'm calling it the right thing) on top of the thermostat housing and what it does or if i screwed up the timing by hooking the advance directly to the carb? The engine previously only ran around 190*F. Any help appreciated and TIA.
Yes, it's a Vacuum Control Valve.
If your routing diagram looks something like this:
You can see that it either ports full manifold vacuum or through a vacuum restriction, limiting vacuum to the advance mechanism in the event of an overheating condition.
Check your total advance and be sure you don't get beyond 40 degrees.
When I installed a new engine I needed to recurve my distributor and install an adjustable vacuum advance canister to limit vacuum advance.
Some good info can be found here:
Duraspark_distributor_recurve_instructions_index
Eliminating the EGR will cause a lean condition with the stock 4180 carburetor and subsequent overheating. (inert exhaust gas displaces some of the oxygen in the incoming charge, making it seem richer than it really is)
I'm sure you can tune your Eddy to work, but be assured mileage will drop under cruise conditions.
Just my 2c, I hope it's helpful.