gasoline is obsolete in the world of 4.5 sec 1/4 mile times

Seriously though, they are an infficient bit of gear and take a lot more power to run than a turbo, but the overall performance gain is still huge if you can get it set up right..... which should be an easier to goal to achieve (with a carby setup) because there are less combinations of boost, throttle position and engine speed than with a turbo.

Did I mention that they sound cool?

Quote:

show us the class that this car would run in?, i believe that 4.5sec drag cars run superchargers because that is what the rules dictate

who's gonna spend that sort of dosh on a car that has no class to race in??? not any sponsers

i could be wrong, but is what i have been told

Them nitro burning cars would have a pretty horrendous exhaust heat & flow characteristics..... I wonder if a hirdryer (or two) would stand up to it?

I dont think the physicists argue about roots blower vs turbo- turbos are more efficient, end of story.

comes down to*ehem* lifestyle choice

Nitromethane is quite slow burning. I wouldn't be suprised if the burninh exhaust gases dissolved the impeller.
A lysholm screw blower is far more effiecient than a roots. Blowers kick ass hard core. (As a WRX found out one morning on my way to work)
As for lifestyle choices, Every girl has a hairdryer.lol

A14 Force, can you run back over your ignition, carby and driveline mods? I know you have mentioned them I just can't find the posts....... I think half of them are posted under a picture, which is always difficult to find.

i.e.
ignition advance- setting used + distributor mods, coil upgrade?

carby used- & jets? if I remember you started with a 32/36 DGV but it wasn't up to it

fuel pump- stock?

Bigger clutch?

driveshaft- stock?

Lets see,
Stock dizzy, with no vac advance. (it would always be advancing with the suck from the blower)
The mech advance is untouched. If there's detonation, I can't here it over the zhorst, fuel pump, and induction howl.
I'm running about 7-8 degrees static advanvance.
Bosch GT40 coil.
The ignition is very much unmodifired at this stage. Down the track, When I can afford some dyno time, I'll modify it somewhat.
I was running a fuelflo pump from repco, But it hit the wall at 7200ish. I have replaced the entire fuel line including the tank pickup with 1/2 line. I now run a holley blue pump, with a mallory reg. I've utilised the the orignal fuel line as a return. I have the spare port of the reg running into it with a resricted oriface. .060. This stops the fuel heating up as much when it's bypassing inside the pump.
The carb is only a crusty old 32/36 weber. I don't remember the jet sizes, But the A/F ratio is 10.5-11.7:1 (ish)
I'll soon be junking it, and fitting my 350cfm holley. I have a nice big cotton gauze air cleaner too, to replace the nasty ramflow.
The flywheel has been remachined to accept a 200mm Lsereis p/plate. I found an off the shelf plate that fits the 60L dogleg 5speed splines too.
Drive shaft is stock.
Currently runing an H150 spring loaded locker in the bum.
In the near future, I'm going to swap the 60L, for my 63A, and fit my H165 spring loaded locker. (Then I can PUNISH it as much as I like, without fear of having to get a tow home)
Without going into too much detail on the redt of the motor it has,
Polished,balanced+shot peened rods,
Balanced crank+opened up oil galleries,
High volume oil pump+bushed rockershaft,
Double v/springs+a big cam,
And a GX head.

So pistons & compression ratio are still stock then?

Can you run your vac advance directly off the inlet manifold, or does it cause problems under boost?

did you drop a heat range on the plugs?

Update- got the bracket tacked together this morning before work for a trial fit- needs some slight adjustments, but looks like it will work. hopefully I'll have the blower mounted by the end of the weekend, so I can put the rest of it back together & get the car back on the road. Then just a matter of sorting out manifolds, fuel pumps & belts, etc.

I run a .060 decomp shim. And the piston bowls have been dished out a bit more.
I never thought of running it straight off the manifold. That would give me advance at cruise throttle. But thats only for econmy anyway. (Mine is extremely poor.

I tried running BP7Es's, but they fouled up something terrible. I might go back to BP6ES's in the future.

Update-

Blower bracket is almost done, welding the idler pulley and some more reinforcement onto it tonight. The belt I bought is too long, so I will probably have to wait till the weekend for the test run to check for belt alignment.

After that, there's not a hell of a lot I can do untill my carby jets arrive.

Pics tomorrow with any kind of luck

Right.

first, the water inlet into the block is too long:

Water inlet

Angle grinder, welder & drill are needed to hack it off and relocate the inlet for the heater hose which you can see sticking straight up:

shorter water inlet

The next step is to get a air con bracket and hack off the bottom (photo above)

You also will want to change over to an A15 water pump if you dont already have one. I have designed the brackets so that it will work around an A12 pump, but you will want the extra flow from the smaller pulley:

water pumps

Next step, the blower.... errr make a bracket and see if it fits ..... I have used the original bracket as a brace while welding to keep everything square:
bracket- starting point