Some wise person once said, "You cannot serve two masters at the same time."
Someone else said, "There is no such thing as a successful dual-purpose car."
They're probably both right.
But some people (myself, included) have the "hope springs eternal" mentality to fly in the face of wisdom and try to prove those two guys wrong.
The admonitions to "Build it RIGHT and you won't NEED power adders" is true as far as it goes; it's not too hard to build a motor that will put out nearly two horsepower per cubic inch at the flywheel if you don't mind living with all the things that are required to get that kind of performance out of a motor; high rpms, high compression(pump gas, anyone?), long-duration cams (vacuum-killing overlap.... whoops, there go the power brakes), high LIFT cams (replace the valve springs regularly because of .600+"-lift-at-the-valve profiles) and sufficient carburetion to destroy most of the low end that the cam hasn't already killed off.
Add to that, a very necessary high-stall converter (if it's an automatic), or a 3,000-pound pressure plate to keep your left leg in a state of oxygen-deprivation, if it's a 4-speed, and some 5.38 gears to keep the revs up, since this engine has not a whole lot of low-end torque, and you have yourself a VERY FAST RACE CAR, and a miserable daily driver that gets even worse gas mileage.
The flip side of that is a low-compression, mild cam car with a little carburetor on it for decent mileage and you have a sedate, (YAWN) driveable. but very boring car that can't, or at least shouldn't, ever be raced.
Power adders are an attempt to make it possible to have a car with decent street manners (a 500 rpm idle), low enough compression to run well on pump gas, sufficient gas mileage so as not to break you at the service station, reliability that won't let you down, and yet enough suds to make you smile when you take it to the strip, or just stand on the loud pedal anywhere you choose.
I've never had a nitrous-assisted car, nor have I had a blown car before now, so I can't speak from experience.
But, ON PAPER, power adders look like they could give you a daily driver with manners that could turn a mild package into a tiger when asked.
What's wrong with that, IF IT WORKS?????????:happy10:
Maybe it DOESN'T work... but, I'm about to find out. My blown engine idles at 475 rpm with 12 inches of vacuum, which seems to work my P/B vacuum booster okay, and the cam that works well with my supercharger has only 214/218-degrees of duration @ .050"-lift, so the low and mid-range torque is considerable.
But, step on it at 3,000 rpm, and it feels like a big block. I don't know how much the blower picked it up, but it really does feel like a totally different car.
I was going to take it to the strip with the blower for the first time, tomorrow, but they're calling for rain. My hope is that it will run about a full second quicker in the quarter-mile and about 10 mph faster.
We'll see....
But, as far as driveability is concerned, it putts around like a 318 2bbl in town. Sort of a Jeckyll/Hyde thing...
Stay tuned; I may have a valid point here, or, I may have to eat my words...
Bill, in Conway, Arkansas