Lancia Aurelia
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Connecting Rods

2/19/2019

1 Comment

 
Picture
old and new connecting rods
The original rods for the early Aurelia engines are worthy of replacement. The conrods were originally sized for the 50hp 538 engine designed in the 1940s, and were unchanged in the early Aurelias.  Perhaps adequate for a B10 berlina, they really aren’t up to a hard driving B20 s.2. As an example, my car was taken off the road in 1963, with a rod through the side of the block. It seems conrods were a problem back then too. 

When Walt Spak rebuilt my engine in 2010 he commissioned new rods from Cunningham on the west coast. They worked closely to get the rods correct dimensionally but also strong. New rods will require rebalancing the crankshaft, as the reciprocating weight for the piston/rod assembly is now greater, it is also important that the rods all match in weight closely. 

The new rods involved a few other changes:
  • a change to shell bearings - we used ones for a Toyota 3R and 5R for the crank and from a Mitsubishi G32B for the condor's (I have the part numbers if needed).
  • Its also likely that one will have to line bore the main bearing bronze shells for the new bearings, and don’t forget to drill the new shells for oil passages. 
  • we changed to an s.4 oil pump for the increased flow. The gears are the same, simply taller for more flow.
  • we changed the oil filter to an adaptor that allowed for a spin-off filter. Its all reversible, so we could go back to the original filter housing (mesh), but with shell bearings, clean oil is needed. 

FYI - I'd recommend looking at the valves too, especially for s.2 engines.Beppe Regazzone once told me that the s.2 valve stems were the same diameter as the earlier motors but were made longer for the new head configuration, and susceptible to breakage. The factory went to thicker stems in the s.3 motor, we made new SS valves. 

Picture
new connecting rod from Cunningham
Picture
two rods
Picture
engine line bored
Picture
little end dimension
Picture
bottom end of rebuild engine
Picture
big end dimension
Picture
top end
1 Comment

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  • Home
    • About
    • map of differences
    • Advertisements
    • Character
    • Original Cars
    • Fangio on the Aurelia
  • Models
    • Berlinas
    • Coupes >
      • Why the series?
      • Series in detail
    • Specials
    • Spiders, Convertibles
    • Nardi
  • Competition
    • Aurelias in Competition
    • Other Racing
    • Special Races
  • Engineering
    • Engines
    • Evolution
    • Crankshafts
    • Camshafts
    • Carburetors
    • Chassis >
      • Front Suspension
      • Rear Suspension - IRS
      • Rear Suspension - de Dion
      • Transaxle
    • Build Quality
    • Drawings
    • Unusual
  • Outgoing
    • Reference >
      • Parts books
      • Web info
      • AST (data sketches)
      • Service Information
      • Parts
      • Color
      • Prices
    • Events >
      • Sliding Pillar
      • Castlemaine
      • Registro Aurelia
      • Other Events
      • B10 photo essay
    • Tech Tips >
      • Carburetors
      • What cam to use?
    • B20 Restoration
    • B20 road test
  • Books
    • Two books for sale
    • Balancing, for sale
    • At the Center, for sale
    • At the Center, in detail
    • Other Publications
    • Articles
    • Lancia Materials FS
    • Library
  • Other Lancias
    • Appia
    • Aprilia
    • Flaminia Super Sport
    • Flavia 2000 >
      • Kugelfischer injection
  • Contact
  • Blog
  • Errata