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View Full Version : 1.4 sr with Centrifugal Supercharger


Elthrin
20-05-04, 03:41 PM
Anyone fitted a Centrifugal Supercharger to a nova?

Anyone heard any storied of people doing this and gen?????
Elthrin
20-05-04, 03:57 PM
And also how much boost can I go up to on a standard 1.4 carb nova before I start breaking stuff.

I don't know much about the engine so any help would be most appreciated.

My best guess is about 130 bhp but anyone else got a clue?
Stuart
20-05-04, 04:28 PM
you getting a mini cooper S charger??


just get the bottom end ARP bolted (rod bolts), deseam and shot peen the rods, crank grin(or polish) new bearings.

if it needs it a hone/rebore.


but keep the block at std height.

run it like that, if you get problems then get a 1.6 head (lower comp ratio without the need for homo spacers)

but you could just run it till you break it and find out what broke to see what needs doing.
Elthrin
20-05-04, 04:43 PM
No I am making a Centrifugal Supercharger which works in the same way as a turbo apart from the fact that the compressor spindle is driven by a geared pully system.

Using the compressor side from a Garrett T-15

So far I have
The Garrett with now totally reworked spindle
1x 20 T5 Alloy Pully
1x 60 T5 Allot Pully
2x 6125 Polly cage ABEC-9 Bearings
4x 615 Polly cage ABEC-9 Bearings
Toothed steel reinforced belt

Just got to build the casing now.

Will end up looking a bit like this http://www.powerdyne.com/silentdr.htm

But not quite so pretty.
Stuart
20-05-04, 04:49 PM
cunning ;)
cooper_nova
20-05-04, 05:14 PM
sounds good mate!!!

good luck wiv it all and let us know wots going on and how efficent it is
MechaT
20-05-04, 06:57 PM
I'm know I'm being pedantic, Cambridge, but the Mini Supercharger isn't centrifugal, it's a Rootes type.
Stuart
20-05-04, 07:10 PM
like i pay attention to what type blowers are lol


i shall blame uni for never teaching us about forced induction :D
rodgerq
20-05-04, 07:34 PM
remember you'll also need to sort out your fuelling under boost. maybe a rising rate FPR or an injector with control unit. otherwise it aint gony last any time. it will run lean and melt

rodgerq
Elthrin
21-05-04, 11:17 AM
rodgerq:

I will be running it in a draw through type arrangement so fueling will not be a problem.

For those of you that do not know a draw through setup is one where the air flows from the air filter to the carb then to the supercharger and then to the inlet manifold.

This is quite an old school way of doing this and has several advantages:

The fuel air mix helps to keep the supercharger cool.
The carb tales care of the fuel/air ratio.
You do not require a sealed carb as the carb is not under pressure.
Boost can be limited by looping the air fuel mix through the supercharger.
rodgerq
21-05-04, 01:33 PM
good idea mate. :beer:

rodgerq
MechaT
21-05-04, 07:30 PM
Sounds cool. I've read that draw thru config. has huge lag cuz the fuel has to go thru the turbo induction. Wanna know how the conversion goes. Sounds really interesting
cooper_nova
21-05-04, 11:21 PM
isn't the draw thru set up wots used on m/cycles for amature drag racing???
rodgerq
22-05-04, 06:18 PM
Sounds cool. I've read that draw thru config. has huge lag cuz the fuel has to go thru the turbo induction. Wanna know how the conversion goes. Sounds really interesting

no lag with a supercharger setup. its constantly running and producing boost

rodgerq
Snowface
23-05-04, 11:21 AM
though they are not as efficient as turbo's mind.
Elthrin
24-05-04, 12:22 PM
Not as efficient but they can produce boost low down the rev range. Which is where you need it driving around on the road.

People always go on about the power that they use up but do not seem to think about the fact the you do not lose power as the supercharger makes more power than it uses to run.

I want power from 2500 to 4000rpm as that is the rev range I use when driving.