Supercharger, was: Re: turbo 'rocs

[jdbubb@ix.netcom.com (Dan Bubb)]

Scirocco-Al wrote:
> 
> I have a supercharger from one of the new mini-coopers.  It's an Eaton M62
> roots type.  I work at a place that designed the assembly system for the
> manufacturer and we had enough parts lying around after we shipped the
> machine to put a few together.  I managed to snag enough parts from the rest
> of the engineering dept to put one together, but I'm going to use the nose
> section off of one of the mercedes units because it's smaller.  I've ordered
> a megasquirt fuel injection system and intend on using a intercooler out of
> an Eagle Talon or some other DSM car.  I've already got a holley
> programmable ignition on the car that lets me set the curve to what ever I
> want and it has a hookup for a map sensor that will automatically retard the
> ignition 1degree for every lb of boost.  I'm hoping on using the ABA block
> with my JH head and intend to switch the injector buckets and then drill and
> tap holes in the back of the head to mount the fuel rail.

On my 84 head the tapped bosses where already there. Just some simple
little bent brackets did the trick.
> 
> I'm planning on mounting the alternator down low like on the early 84 and
> older cars and then mounting the supercharger up where the alternator used
> to go.  I can place a drive pulley for the supercharger between the crank
> pulley wheel for the ignition and the billet udersize pulley my I have on
> there now.  I'm not sure if Im going to put in a springloaded belt tensioner
> or make the mounting for the supercharger swivel to tension the belt.  I'm
> lucky enough to have access to autocad prints of the pieces so designing
> brackets won't be too tough.
> 
> I'm also torn on using the ABA or the JH motor.  The JH has the nice 8.5
> compression and the ABA has the 10.5.  I'm not sure which one I'm going to
> end up with but I'm really leaning towards the ABA and spinning the
> supercharger a little slower to keep the boost level down to reasonable
> levels.

I know you can compensate by upping boost, but I would think it would be
worthwhile having a 2.0 vs. 1.8. Apparently, the ABA pistons can be
machined to lower CR to 9.2 without compromising strength. Tectonics did
this for a guy for a turbo application. Not sure the details, but if I
was staring at a piston I bet I could figure out what to machine. (I
will be doing this for my engine in the next couple months unless I'm
able to run ~15 psi with the stock compression)
> 
> Anyone have a source for a aftermarket knock sensing system?  If it just
> turns on a light that would be great as I can hook that lead directly into
> the holley ignition and program it to reduce ignition timing.
> 
> Any comments or suggestions on this project are appreciated.

Keep us all informed of how it comes out, since I know some other people
thinking of supercharging.
> 
> Thanks!
> 
> Alan
> ----- Original Message -----
> From: "Larry" <rocco16v@netzero.com>
> To: "Scirocco-Al" <scirocco-Al@insight.rr.com>
> Sent: Wednesday, July 17, 2002 8:54 PM
> Subject: Re: turbo 'rocs
> 
> S-A
>  I am interested.
> Tell me more.
> (if you complete this project, you can count as TWO!  Superchargers rule)
> Larry
> 
> > If all goes well by this time next year I will have an ABA in my 84 with
> an
> > Eaton Supercharger.  I have all the major parts, I just need to make some
> > brackets and get some time....
> 
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