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Supercharger Question


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#1 Albino_Hedgehog

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Posted 08 October 2019 - 12:45 PM

Hello,

Been offered first refusal on a supercharger kit that has never been fitted to a Mini.

It arrives with the manifold, pulleys, belt etc.

I'm thinking if I do take it then it will go on my recently rebuilt mild 1098 engine.

However can I fit the charger without having a MegaJolt system? Am I ok to stick with my old skill dizzy, and also enjoy the benefits of the charger?

Cheers for any info!

#2 Dannyboolahlah

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Posted 08 October 2019 - 01:05 PM

Yeah they run fine with a dizzy.
I have mine on a 998 using the standard dizzy.

#3 HUBBA.HUBBA

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Posted 03 November 2019 - 10:48 AM

You need a vacuum advance dizzy



#4 Albino_Hedgehog

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Posted 03 November 2019 - 06:13 PM

Okies then thanks very much!!


Next question...


My 1098 Engine has recently been rebuilt and has not yet been fitted to the car.

The engine spec is as follows:

295 head w/skim of .60 thou

Standard pistons as fitted to MG 1100



Will I need to carry out any more modification to my engine, or will I be able add this supercharger straight up, and be away with some correct tuning adjustments?

Have read that I could need to fit a decompression plate between the head?

Edited by Albino_Hedgehog, 03 November 2019 - 06:14 PM.


#5 HUBBA.HUBBA

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Posted 04 November 2019 - 12:02 PM

You're best off having deep dishes pistons to get the CR low enough. Or worst case scenario decompression plate.

#6 DeadSquare

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Posted 04 November 2019 - 12:42 PM

If you had had the combustion chambers reprofiled, you might have got away without any further modification, but not with flat tops and .060" skimmed off a standard 295 head.

 

You need at least a 4mm decompression plate, and as you describe your 1098 as "mild", maybe even 6mm.

 

Go for it, it is a nice combination.



#7 dyshipfakta

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Posted 05 November 2019 - 12:39 PM

Get the compression ratio wrong with a non intercooled blower and your pistons will end up looking like cheese. I’m quite surprised the 998 dizzy doesn’t have too much advance either to be fair.

#8 G'Racy

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Posted 08 November 2019 - 06:45 PM

What amount of torque you could expect from a supercharged 1098 compared to say the 998 and 1275 ???

#9 HUBBA.HUBBA

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Posted 09 November 2019 - 09:20 AM

Rough guide is times the existing hp by 1.4, so 100bhp would be 140bhp



#10 mini13

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Posted 09 November 2019 - 10:10 AM

The 1.4 multiplier is used in a lot of racing regs for forced induction, there were some brothers hilclimbing a turbod 998 in a 1400cc hillclimb class rather successfully.

#11 HUBBA.HUBBA

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Posted 10 November 2019 - 10:14 AM

The 1.4 multiplier is used in a lot of racing regs for forced induction, there were some brothers hilclimbing a turbod 998 in a 1400cc hillclimb class rather successfully.


Yep. That's I got the 1.4 multiplier from, hillclimbing.

Edited by HUBBA.HUBBA, 10 November 2019 - 10:16 AM.


#12 G'Racy

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Posted 10 November 2019 - 11:50 AM

More asking about the torque rather than bhp, still a factor of 1.4 ???

#13 DeadSquare

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Posted 11 November 2019 - 12:30 PM

The 1.4 figure came about, because in the days before tapping in 3.1416 into a calculator, when working out the theoretical CC of the engine with pencil and paper, it was easier to use 22/7 for pi because 7 is half 14.

At one time, Formula 1 was either 3 litre or 1.5 litre supercharged, and in recent years I have seen turbocharged cars using 1.7.

"Not a lot of people know this" , back in the early 1960s, to run a supercharged A series engine in the 1,500 class, it needed to be no larger than 1,071cc.


Edited by DeadSquare, 11 November 2019 - 04:39 PM.





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