View Single Post
  #242  
Old March 7th 2012, 03:26
owdlvr's Avatar
owdlvr owdlvr is offline
Registered User
 
Join Date: Sep 2008
Location: Canada - West Coast
Posts: 788
Dry Sump tank is back from welding, and back in the car for the final time. Other then that, I spent some time on Warwick's Mini and didn't accomplish much else! I did spend most of the time I would normally spend in the garage working on confirming all the needed parts to finish the car. The goal is to have the car ready for alignment in two weekends, which means having the engine installed, rear suspension mounts finished and all the other stuff needed to get it trailer worthy and running weight.

I am going to have a few issues moving forward though. One of the required items is a BMD serpentine pulley system. So far its the only system I have found which keeps the correct ratio between the crank pulley and the alternator pulley. The dry sump pump requires a 5.25" or smaller crank pulley, which then requires a much smaller alternator pulley if you want to have the same fan speed and cooling as a stock setup. Lots of lower crank pulleys available, but only the BMD system includes a well sized upper pulley. Problem? BMD isn't going to be building any for about three weeks.



The current plan is to purchase the BMD kit when it's available, but I do need to come up with a solution in case they are delayed. The first event I have to run is April 27-29, and I'd like to get some shakedown done beforehand! I've called everyone who makes, or carries, a dry sump sized pulley on their website. Finally found a CB performance one which can arrive on Friday. That really hurt since Rob at AVR called me yesterday and asked I might need anything from CB performance...I said no! The CB pulley is a V-Belt style pulley, which does lead to the next problem: Pulley ratio.

I'll save you all the math and figures, and state it simply:
Stock alternator pulley diameter: 4.25"
Required pulley diameter to keep the proper fan speed: 3.30"
Required pulley diameter to keep the ratio I was using: 2.94"

Available pulley's in 3.3" or 3"? Zero.

The Porsche 356 pulley, which is a straight bolt on, is 3.75", which at least gets me closer. I'm also going to consider putting my current serp-belt upper pulley in the lathe to cut it down into a pulley with a v-shape grove. It's currently 3.75", and I think it has enough meat on it to get me down to 3.5" and shaped for a V-Belt. The only problem with that idea, is I have no way to tension the belt. I wonder if ghetto-rigging the serpentine belt tensioner to press against the back side of the v-belt is an option. Not pretty, but at this stage I'm looking for emergency-situation functional!


One of the advantages of the CB pulley is the fact that its an aluminum pulley bolted to a steel center section. In theory I could have a serp-belt pulley machined and setup to bolt onto the center section. I could quickly turn down the upper serpentine belt pulley that I have now, and end up with a ratio that is almost dead-on the stock one. Problem is I suspect that having a crank pulley machined up quickly is going to be overly cost prohibitive, and I won't be able to maintain the serp-belt groves in the upper pulley.

Come to think of it...I could just run the event with a standard oil pump. Geesh, why didn't I think of that this afternoon?

-Dave
__________________
'71 Type 1 - Rally Project
'58 Type 1 - I bought an early!?!
'73 Type 1 - Proper Germanlook project
'68 Type 1 - Interm German 'look' project
'75 Type 1 - Family Heirloom
'93 Chevy 3500 pickup - Cummins Swap
Reply With Quote