NECO Forums - View Single Post - Project: Mavro Gato

FastCougar · 08-09-2007, 09:44 PM

Well, I replaced the wires with stock units and the upper RPM stumble is still present. There is definitely an ignition and/or fueling issue above 6K RPM. Below that limit, the engine runs perfect now with the new tune and has plenty of power above 3K RPM.

I just thought of something ... my plug gap! I'm running a stock gap of .054 inches.

Now, keep in mind, I'm running 9:1 CR pistons with bowl work done on the heads, so I'm figuring roughly 8.8:1 CR. Wouldn't I want to adjust my plug gap considering I'm a full point of compression lower than stock? I would figure that I need to increase my plug gap to say .060 inches. Sound right?

08-09-2007, 09:44 PM	#373 (permalink)
FastCougar In search of more boost! Join Date: Nov 1999 Location: Kearneysville, WV Posts: 8,550	Re: Project: Mavro Gato (56K ... Get a cup of coffee) Well, I replaced the wires with stock units and the upper RPM stumble is still present. There is definitely an ignition and/or fueling issue above 6K RPM. Below that limit, the engine runs perfect now with the new tune and has plenty of power above 3K RPM. I just thought of something ... my plug gap! I'm running a stock gap of .054 inches. Now, keep in mind, I'm running 9:1 CR pistons with bowl work done on the heads, so I'm figuring roughly 8.8:1 CR. Wouldn't I want to adjust my plug gap considering I'm a full point of compression lower than stock? I would figure that I need to increase my plug gap to say .060 inches. Sound right? __________________ 1999 Mercury Cougar - Turbo'd 3L. Status: Parting out car: Engine for Sale \| Trans for Sale Power: 391.9 hp @ 6750 rpm \| 374.2 lbs/ft. @ 4250 rpm \| boost @ 11 psi For Sale: 19" Konig Verdicts with Toyo ProxesFZ4 225/35ZR19 Tires - $700 shipped!