23 replies to this topic

[minijay]

hi im all most certian this has been covered before if so can some one please post a link i would just like to know what is involved in supercharging a stanard 1275 and what kind of power out put?

cheers

[minibazzer]

hi im all most certian this has been covered before if so can some one please post a link i would just like to know what is involved in supercharging a stanard 1275 and what kind of power out put?

cheers

technically speaking it is not possible to fit a supercharger to a 1275 mini without making any modifications. you will need to remove or partially remove the engine from the car as the timing cover needs to be replaced in order for the supercharger pulley to be fitted. therefore while the timing cover is removed you might as well at least replace the timing chain. also to make the most of the supercharger, you should be looking to fit a 276 camshaft.

in addition, i would also suggest uprating the radiator and ignition as a bare minimum...

i am doing a supercharged 1340 which is obviously based on the 1275. if there is anything else i can help with, just let me know....

[smith1380gt]

You will need a cylinder head with larger chambers (26-28cc)or a decompression plate and 2 headgaskets (either way, the head has to come off), the timing cover needs the breather removed and the hole plugged, you need at least an uprated 2 core radiator, and will have to re-route some heater hoses. Can be done in a weekend.

With an uprated Avonbar head and roller rockers, mine makes 110hp at the wheels, roughly 130-135 at the crank. Thats with everything else standard.

Edited by smith1380gt, 22 December 2008 - 03:08 AM.

[minijay]

cheers guys that very helpful im really considering this i knew i would have to do mods for the pullys and have the engine out but i was just asking about the engine its self like the head or the bores but thanks for all the info

cheers

[mish000]

what sort of supercharger do you use and were could you source one from?

[Ministage2]

You will need a cylinder head with larger chambers (26-28cc)or a decompression plate and 2 headgaskets (either way, the head has to come off), the timing cover needs the breather removed and the hole plugged, you need at least an uprated 2 core radiator, and will have to re-route some heater hoses. Can be done in a weekend.

With an uprated Avonbar head and roller rockers, mine makes 110hp at the wheels, roughly 130-135 at the crank. Thats with everything else standard.

Jesus christ!! really?? run that one by me again!!

So everything else standard!

 

Do give some details!!!

[HUBBA.HUBBA]

130 - 135hp  on a 1275 ?

Edited by HUBBA.HUBBA, 16 January 2014 - 08:27 PM.

[Gr4h4m]

I would say that's achievable. But I would be using a 112deg lca cam like the re13t. Rev to 7k and you will be close on about 12psi if measured at the fly.

You will need a good flowing head and a simple water injection kit, I use a headlight washer pump and some hose....

[Nick Warwick]

what sort of supercharger do you use and were could you source one from?

 

most use supercharger is the Eaton M45 from a MINI cooper S. You can source these in scrap yards and on ebay for around £200 or less.

[maccers]

You will need a good flowing head and a simple water injection kit, I use a headlight washer pump and some hose....

 

Whats that used for then?

[Gr4h4m]

Injecting water into,the mouth of the charger, via a nozzle. a simple pressure switch turns the pump on at 5psi. Brings the inlet temps down....

You could also use a nitrous kit to reduce the intake temps... But that has other effects too :)

[HUBBA.HUBBA]

Interested in this. So where on a suck through would the water injector go? At the top of the inlet pipe?

 

Just to confirm I'm thinking of this right... you would have air, fuel and water going into the charger?

[maccers]

Perhaps its just a fine mist thats injected not actual huge drops of water like a windscreen washer jet.

[Turbo Phil]

You need to use a pump producing a high enough pressure & a proper nozzle to produce a very fine mist. The water needs to be properly atomised to mix with the incoming charge.
On a suck through it will have most benefit injecting it before the charger.

Phil.

[M30]

 

what sort of supercharger do you use and were could you source one from?

 

most use supercharger is the Eaton M45 from a MINI cooper S. You can source these in scrap yards and on ebay for around £200 or less.

 

Or you could use the M45 from a Merc, chop the end off and weld a plate on. It has the advantage of not having the water pump drive on the end, making the inlet lower down, and they're cheaper. I got mine for £100

 

Stu