Wednesday, August 26, 2015

3.55 differential complete

You might recall from earlier posts the 3.55 differential upgrade has been a piecemeal project. I purchased the (rebuilt) differential and output shafts from UK sellers, and a Lotus aluminum differential cover from a local enthusiast. Everything has been inspected, cleaned and repainted. Now it's time to put it all together.

A quick word about the output shafts. Many sources state it is important to reinstall the output shafts on the same side of the car because the splines are stressed in those directions. The seller was kind enough to mark the shafts with "N" (nearside) and "O" (offside). On this side of the pond, the nearside would be the passenger's side.

The first output shaft went in fairly easy. I used my finger to apply a liberal amount of grease inside the differential flanges, and around the outside of the bearings. A few light taps with a ball peen hammer and everything slide into place. The outside retaining clip snapped in.

The second output shaft took about an hour of gentle "persuasion" to install. I also had to use some touch-up paint because the hammer & ring pliers scraped the red off.

Here's the finished result:


I also painted and installed a chassis stiffening bar.


Another project complete & ready to go on the car.

Tuesday, August 25, 2015

Refurbishing the output shafts

I bought a small sandblasting / soda-blasting box this week. It makes setup & cleaning up much easier! My first project, the output shafts.

After soda-blasting & cleaning with Simply Green:



You will notice some flecks of red - the original color. The closest match I could find was Dupli-Color Radiant Fire; which I sprayed over two coats of rust proof primer:


Gently hammered new bearings on and installed inside retaining clip:



Friday, August 7, 2015

Oil & filter information

Some good reading on oil filters:

http://filtrationcomparisons.weebly.com/test-pictures-and-results.html

I now use Mann 719/5 filters on my Twin Cam.

And:

http://speedtalk.com/forum/viewtopic.php?f=1&t=28365

which precipitated my change to Valvoline VR-1 20W50 Racing Oil.

Tuesday, August 4, 2015

New jets & chokes in

Making a little progress on the car. The new Weber jets & chokes have been installed; and K&N filters are on.

I used the Lotus "Big Valve" (type D cam) specs:

Choke: 33 mm
Main jet: 120
Air correcting jet: 155
Slow running jet: 50 F8
Accelerator pump jet: 35
Accelerator pump stroke: 10 mm
Starter air jet: 100
Starter petrol jet: F.5 / 100
Emulsion tube: F 11
Needle valve: 1.75
Ram pipe length: 3.8 mm
Float levels: 8.5 mm & 15 mm (including gasket)