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mad max car
Spartacus
Member Posts: 14,415
in the original mad mad (1979) the patrol car had a cable operated bolwer disconnect.
can that really be done?
thanks
tom
can that really be done?
thanks
tom
Comments
so if the blower ran 8psi on a 10:1, you could still run some boost on a 13:1 performance engine, right?
kinda like a shot of nitrous.
but how would you mechanically do the disconnect on the blower?
well, if it's anything like turbos, the boost can be significantly higher than "recommended"
so if the blower ran 8psi on a 10:1, you could still run some boost on a 13:1 performance engine, right?
kinda like a shot of nitrous.
but how would you mechanically do the disconnect on the blower?
Since a blower is belt driven - an electric/ mechanical clutch is an option. If there is such a thing.... for a supercharger.
quote:Originally posted by Spartacus
well, if it's anything like turbos, the boost can be significantly higher than "recommended"
so if the blower ran 8psi on a 10:1, you could still run some boost on a 13:1 performance engine, right?
kinda like a shot of nitrous.
but how would you mechanically do the disconnect on the blower?
Since a blower is belt driven - an electric/ mechanical clutch is an option. If there is such a thing.
Or maybe like a bicycle with the free wheel?
I seem to remember he would do something in the car and then the Blower drive belt would begin spining.
quote:Originally posted by Spartacus
well, if it's anything like turbos, the boost can be significantly higher than "recommended"
so if the blower ran 8psi on a 10:1, you could still run some boost on a 13:1 performance engine, right?
kinda like a shot of nitrous.
but how would you mechanically do the disconnect on the blower?
Since a blower is belt driven - an electric/ mechanical clutch is an option. If there is such a thing.
You need look no further than your Riding lawn mower.
quote:yes for years people have laughed at the clutch mounted in the blower of that awsome holden cop car and sait it's imposible, blowers use so much power a clutch will not handle it and so on, but... the other day I changed the drive chain in my explorer's transfer case and found an electromagnetic clutch that connects the front axle, man this thing handles all the engine torque transmited to the wheels and is quiet a lot, Toyota has an electric clutch driven roots supercharger in the 4AG engine fitted to the MR2 sport car, so what is the problem? maybe 8-71 blowers are too big but they are not driven on the streets daily, what about the small 144/177 range street blowers? it would be great having the pull switch on the stick shift to activate the blower, the motor runs pretty well without power to the blower, I have driven my own sbc 350 motor wich has a B&M 144 blower for long time without the drive belt when it broke once and I had trouble finding a new one, the motor behave just like it had no blower, even the big cam was tamed, it surely makes me think it's possible.
Would it be possible to use a muti disk modified A/C clutch? compressors use lots of power, I'd say a 3 lined disk setup with the electromagnet pressure plate, go kart motors have clutches that handle more than 45 hp.
Has someone ever made a device such as this hollywood gadget?
Mad Max was JUST A MOVIE!
I forgot that ride had two spoliers. I wonder why them fart can cars only have one big one like the "Super Bird"? I say go with three. One on the hood right up front to keep the nose down.
I forgot that ride had two spoliers. I wonder why them fart can cars only have one big one like the "Super Bird"? I say go with three. One on the hood right up front to keep the nose down.
That's what the air dam under the front bumper is designed for
quote:Originally posted by yoshmyster
I forgot that ride had two spoliers. I wonder why them fart can cars only have one big one like the "Super Bird"? I say go with three. One on the hood right up front to keep the nose down.
That's what the air dam under the front bumper is designed for
I meant on ricers.
Mad Max was JUST A MOVIE!
correct, that's the whole idea of the question. run a high performance engine ambient pressure, with the ability to activate boost
the electronics to boost fuel pressure/delivery are basic.
the mechanical link is what's not been done, near i can see.
I have a 1987 grand national buick with worked 3.8L turbo. It has an electric header cutout mounted in the turbo exhaust feed. I can launch the car on the engine and headers, then switch to turbo and straight pipes.
that's what i'm looking for with a blower, but mechanical engage.
tom
The goal is to keep from having the blower fighting the throttle when you are driving slow because generating extra vacuum causes extra throttling losses.
Someone mentioned compression but the thing is, if you're cruising at 35mph then the throttle is preventing the blower from pressurizing the manifold anyway, or else you'd be accelerating. In other words, by closing off the inlet to the blower, it's making the blower compress a high vacuum to make a lower vacuum, so the cylinders only get partially full and you don't develop the full horsepower the engine is capable of, when you don't want it.
So, it has been done. It helps save gas. You still get the reduced economy of a low compression engine, but at least you're not forcing the blower to create a super high vacuum under the carb, just so the manifold pressure stayed low enough to keep the car cruising steadily rather than accelerating.
You couldn't just stop the drive belt unless you gave the mixture another way of getting into the manifold, as another poster has mentioned.
One of the reasons some of our early WW2 fighters were criticized was the fact that you couldn't turn up the blower at high altitude. The state of the art setup was a two speed, two stage blower. That was so you could have high boost at high altitude to make up for the thin air, but that high boost wouldn't blow up the engine at low level, and there'd be less parasitic drag at low level because you wouldn't be controlling the boost by throttling back and making the blower fight the throttle. Instead, you'd run the blower at a lower speed.
It's not a real big supercharger like the 671 on the Mad Max car.
A port fuel injected engine puts the fuel in downstream of the blower.
Mercedes has had an electric clutch on some of their superchargers for for the "kompressor" cars for several years.
It's not a real big supercharger like the 671 on the Mad Max car.
Yep. Basicly it uses an oversized A/C clutch.
If the blower vanes stop turning it instantly chokes off air to the engine.
Mad Max was JUST A MOVIE!
Yep, break the quill shaft in a Detroit, and see how fast it comes to a halt.
quote:f the blower vanes stop turning it instantly chokes off air to the engine.
Mad Max was JUST A MOVIE!
correct, that's the whole idea of the question. run a high performance engine ambient pressure, with the ability to activate boost
the electronics to boost fuel pressure/delivery are basic.
the mechanical link is what's not been done, near i can see.
I have a 1987 grand national buick with worked 3.8L turbo. It has an electric header cutout mounted in the turbo exhaust feed. I can launch the car on the engine and headers, then switch to turbo and straight pipes.
that's what i'm looking for with a blower, but mechanical engage.
tom
We need pics of this said GN or else it aint true....[:D]
Cars built to run with boost pressures run like crap without.
Thing is, you're not going to have boost pressure when you throttle back to cruise anyway, if you don't have a bypass.
No, not when you're cruising at part throttle. What the blower amounts to is this: you have to hold the throttle more closed.
You're only making enough horsepower to cruise at a steady speed, so why should the lower manifold have more pressure in it than a normally aspirated engine of the same size also cruising at the same steady speed, in a car of the same air resistance and rolling resistance?
You have much higher vacuum behind the throttle plates in a blower engine at part throttle cruise, which then gets compressed up into a lower vacuum below the blower, which is about the same as the manifold pressure in the same car with the same size non-blower engine cruising at part throttle at the same speed.
Of course it's not exactly the same because your camshaft timing is going to be different so you need a slightly different manifold PSI in order to make the same part-throttle power. Also, the blower car has to generate a little more HP in order to overcome the extra drag.
If there was more pressure in the manifold, then you'd be making more power and accelerating-or cruising faster than the car with less manifold pressure, if it's the same car with the same size engine.
You'd have a lot less mileage even if you had some sort of perfectly frictionless blower and drive system.