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Author: Subject: supercharging bike engine
aidan46

posted on 3/4/12 at 10:26 AM Reply With Quote
supercharging bike engine

Considering supercharging 1000cc Kawasaki bike engine. Dose any one know if / how the end of crank shaft can be modified to take a shaft for a pulley for the supercharger. Was thinking of using a S/C from the 1.6 mini or some of the merc kompressors maybe. I know rotrex do a model for bike engines.... an R1 i think.... but there way to expensive!!!

Came across this video of a supercharged blackbird.

http://youtu.be/PEMPprjbCD0

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scoop

posted on 3/4/12 at 11:22 AM Reply With Quote
If you are going to have a full remap or even new ecu why not go small turbo. They always look easier and cheaper to do. Or even cheaper is a bit N2O
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aidan46

posted on 3/4/12 at 11:27 AM Reply With Quote
Yeah, ill run it with megasquirt , already have the ecu. Gonna use the engine in a race car so like the idea of insant power with the supercharger!!.....just not sure how the crank pulley setup will work ect..
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rdodger

posted on 3/4/12 at 12:05 PM Reply With Quote
I would consider a small turbo. Surely a small modern turbo will spool up almost instanly on a small capacity engine?

I ran a MP62 supercharger on my MX5 which is now being used for my kit. If I was doing it again I may well go the turbo route as it offers more power, can be cheaper and the induction temps tend to be lower than the blower. It is also the more well trodded path so more parts available.

Having said that I do love the linear power delivery. It feels more like a turbine than an engine.

Actually yes go for the charger! The manic wine alone makes it worth it!

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pekwah1

posted on 3/4/12 at 12:24 PM Reply With Quote
i'm all up for a charger as long as it's on a ford gt engine!
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aidan46

posted on 3/4/12 at 12:34 PM Reply With Quote
There'd be less fabrication work with manifolds with the S/C in comparison with the turbo, am i right? also dose the s/c the need an oil feed?
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T66

posted on 3/4/12 at 01:01 PM Reply With Quote
The guy who owns/owned that Blackbird in your video thought he had the only Rotrex Blackbird engine in the country, till I showed him mine.


If you keep your eyes peeled online, I found my Rotrex (brand new) for 650


The Rotrex runs direct off the crank end with a small cush drive, and the machined billet stator housing, well I wouldnt like to think how much that cost unless you can find mates rates somewhere.


















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Toniq-r

posted on 3/4/12 at 02:29 PM Reply With Quote
http://youtu.be/A_ik13GfsL4 Hayabusa Supercharged fitted last year

http://youtu.be/5xT7_yUpISE Nice and loud!

http://youtu.be/mT8RcHUnoqk New plugs needed !!!

[Edited on 3/4/12 by Toniq-r]

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T66

posted on 3/4/12 at 03:21 PM Reply With Quote
quote:
Originally posted by Toniq-r
http://youtu.be/A_ik13GfsL4 Hayabusa Supercharged fitted last year

http://youtu.be/5xT7_yUpISE Nice and loud!

http://youtu.be/mT8RcHUnoqk New plugs needed !!!

[Edited on 3/4/12 by Toniq-r]





I know who I think did yours ? Do you know who did mine ?




I hear him laughing in the first vid lol

[Edited on 3/4/12 by T66]






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rdodger

posted on 3/4/12 at 03:25 PM Reply With Quote
quote:
Originally posted by aidan46
There'd be less fabrication work with manifolds with the S/C in comparison with the turbo, am i right? also dose the s/c the need an oil feed?


There will be fabrication to mount the charger and sort the inlet and outlet out.

Are you thinking Rotrex or Eaton? Rotrex needs an oil feed, return, cooler, filter etc. Eaton doesn't. An Eaton off a MINI might work? Lots of MX5's use these and some conversion parts available for it may work for you.

http://www.trlanefabs.co.uk/SUPERCHARGER-PARTS.html

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aidan46

posted on 3/4/12 at 03:41 PM Reply With Quote
The Eaton sounds handier I suppose if it doesn't need a oil feed ect.....the big unknown i have really is mounting a pulley off the crank.

see this here:

http://www.aaperf.com/images/vfr-6thgen/belt_drive.html---------(Note: im using in kit car not bike)

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rdodger

posted on 3/4/12 at 04:53 PM Reply With Quote
MMnnn that looks a bit lightweight.

I run a 6 rib pulley and belt under quite a lot of tension using an auto tensioner. That one looks like it will slip all the time.

It looks like you can mount a pulley there though. I know nothing about bike engines but isn't the Staitor normally on the end of the crank?

Perhaps that can be binned and a small alternator fitted on the same belt?

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aidan46

posted on 5/4/12 at 09:30 AM Reply With Quote
Can the amount of boosts be regulated on a s/c ? Or do they come set values?
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rdodger

posted on 5/4/12 at 01:06 PM Reply With Quote
It's not like a Turbo where you can alter the boost. But unlike a turbo it isn't peaky. It's more like having a larger capacity engine. So if you don't want all the power you just don't press the pedal as far.

In terms of the size of the charger it's denoted by the number. M62 shifts 62 cubic inches per revolution.

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aidan46

posted on 5/4/12 at 01:19 PM Reply With Quote
So say for example I took a supercharger from a car rated at constant 12psi, if the pulley size is changed to say double the size from the original vehicle will this provide say 6 psi half the original. Ie turn the s/c slower?
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rdodger

posted on 5/4/12 at 01:29 PM Reply With Quote
Sort of

It's not quite that simple. The PSI is the back pressure created by pushing more air into the combustion chamber. A higher flowing head would see lower psi (boost) than a less well flowing head but could see higher bhp.

Have a read of this

http://www.kennebell.net/techinfo/general-info/SC_efficiency.pdf

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