Dec 18, 2000 update to the Mazda Miata project car

Head

Our new cylinder head is done and has been installed. Hats off to Engineered Performance and Clark Engine Works for coming up with a setup that makes more power. We’re now making 112.8 horsepower at the rear wheels—20 more than the car made when we first got it. Torque is up, too.

The new head features swirl-polished, stainless-steel valves, lots of porting and polishing as well as a light shave. It makes power from 2000 rpm up to redline, so it’s totally streetable. The car also idles fine and runs on pump gas. While the head was off, we replaced many engine parts—waterpump, timing belt, idler pulley, coolant hoses and so on—essentially renewing the entire engine.

We just did our first oil change since installing the new head, so we’re ready to go do some 0-60 runs. The car’s sump is now full of 5W-30 Red Line synthetic oil.

The complete story on the engine mods and tuning will be in the February issue, yet we’re already looking for ways to make more power. Hmmmmmm……

On another note, we have been running the Nitto NT555R Extreme Drag radials on the street since July. After a few thousand miles, we have found them to be an excellent dual-purpose tire: grippier than a normal street tire but longer lasting than a normal race tire. As a bonus, they’re quiet and have a wide, usable slip angle. We are running a 205/55-14 size on the stock 14x5.5-inch Miata wheels. Soon we’ll be going to mount a set of 195/50-15 Toyo Proxes T1-S tires on 15x6.5-inch Rota Circuit 8 wheels.

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Quasi Mofo
Quasi Mofo MegaDork
3/5/09 9:29 a.m.

Nice ground effects, makes it look more like Barbies.

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