Engine and Transmission Tech

tips, technology, tools and techniques related to vehicle driveline components

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Mark Penny
Ontario, Canada
(9 posts)

05/22/2011 09:11PM

Main British Car:
1973 Triumph TR6/V6 3800 S/C http://mpenny.com/arrowhead/

My L67 Supercharger modifications
Posted by: mypenname
Date: July 02, 2012 10:31AM

I thought I would share the small modification to the supercharger for my Triumph TR6 L67 swap

I shortend the nose of the M90 Gen V supercharger .

I turned down a new shaft that is about 4 shorter then the original.


Pressed on the bearing. The knurling on the shaft holds the drive flange


Drive flange pressed on.


I cut down the housing on the mill and machined the new bearing pocket.



Finished machining the parts.


Test fitting the shortened supercharger.


Compared to the original length of the nose.


Time to start on the jack shaft and pulleys.


The Vortech 2A033-032 32 Tooth 35mm Supercharger Drive Cog Pulleys finally arrived so I can now start on the supercharger housing for the jack-shaft. The jack-shaft adapter is made from a 1 thick piece of aluminum, with a pocket for the sealed bearing. The housing clamps onto the nose that I machined into the neck of the supercharger. I ended up making a new supercharger shaft to fit the 20mm keyed opening of the 8mm 32 tooth cog pulleys.



Test fitting the shaft and belts. A belt tensioner will fit in to the back of the jackshaft adapter.


I am working on the serpentine belt design. A separate belt will be used for the water pump-alternator and the supercharger this will allow the engine to still run if I have a supercharger failure.


Starting to design the brackets for the serpentine end of the jackshaft. I print out the design on paper to make sure it fits before machining piece out of aluminum. The bracket will be designed to allow the installation of a intercooler at a later date.


Supercharger serpentine belt tensioner being test fitted to the paper pattern.


Testing the supercharger serpentine belt routing



Curtis Jacobson
Portland Oregon
(4523 posts)

10/12/2007 02:16AM

Main British Car:
71 MGBGT, Buick 215

authors avatar
Re: My L67 Supercharger modifications
Posted by: Moderator
Date: July 02, 2012 10:46AM

Awesome! I enjoy seeing what you're able to do with proper machinery.

Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6153 posts)

10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: My L67 Supercharger modifications
Posted by: BlownMGB-V8
Date: July 02, 2012 11:06AM

Looks quite good and the M-90 will work well with that engine. Boost should be reasonable with those pulley sizes.


MG four six eight
Bill Jacobson
Wa state
(317 posts)

10/23/2007 02:15AM

Main British Car:
73 MGB Buick 215, Eaton/GM supercharger

Re: My L67 Supercharger modifications
Posted by: MG four six eight
Date: July 02, 2012 03:28PM

Looks good! Very clever mounting the S/C reversed!

Edit: Mark,

Looking at your pics again, (you may already know this) I think that you will need to drive your idler shaft in the counter clockwise direction. The S/C needs to rotate clockwise when viewed from the drive end of the S/C. The counter clockwise rotation of the idler shaft would be easy to accomplish by running the drive pulley on your idler shaft off of the back side of the belt.
They make double sided serpentine belts that should work well for this purpose.


Edited 1 time(s). Last edit at 07/03/2012 09:28AM by MG four six eight.

david chimes
Reading, UK
(12 posts)

12/13/2009 08:40AM

Main British Car:
JaguarXJ8 & XK8 Original GT V8 (just s 2ltr

Re: My L67 Supercharger modifications
Posted by: chimes
Date: July 03, 2012 03:10AM

Superb work, thinking outside the box!

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