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Author Topic: Alloy con rods  (Read 4976 times)
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DavidLaver
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Posts: 4144



« Reply #15 on: 02 December, 2013, 11:15:44 AM »


Any news on rods?

As for the latin:

https://www.google.co.uk/#q=Semper+floreant+

David
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David Laver, Lewisham.
welleyes
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Posts: 54


« Reply #16 on: 05 December, 2013, 07:46:22 PM »

No news yet. Things are moving rather slowly at the moment on the Lancia. Slightly bad planning as our other cars are open and the weather is getting cold. What am I saying? If there was any planning involved, the Lancia did it, not us.

Stuart
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DavidLaver
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« Reply #17 on: 22 May, 2014, 08:12:23 PM »

See the new thread:

http://www.lancia.myzen.co.uk/forum/index.php?topic=7135.0
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David Laver, Lewisham.
GG
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Posts: 430


B20 s.2, Appia C10 unrestored


WWW
« Reply #18 on: 23 May, 2014, 03:51:14 PM »

Had new rods made for my s.2B20 two liter motor - the originals were a bit thin and have a reputation for failing at high RPM. Had them made in Calif, and while they were much stronger, they were a bit heavier. However, the conversion to thin shell bearings eliminated the bronze shells, and so the overall weight difference wasn't much - something like 25 gms.

The trick was that the center of gravity of the weight shifted further up the conrod, and more importantly was a change in the split between that portion allocated to reciprocating weight (around the big end) and that allocated as reciprocating weight. As such, a new balancing weight was derived for use on the crank, rebalanced accordingly. Still smooth as can be.

Balance on the V4 is a bit trickier as there are still unknowns here in what is the proper formula, but the basic issue is the same: that the balancing weight used for the original crank is done with an assumption of the original piston/pin/rod, etc., and where that weight is roughly placed. Change any part of that, and some refiguring is needed.


* B20 s.2 new conrods sml.jpg (1371.3 KB, 1200x900 - viewed 316 times.)
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B20 s.2, Appia C10 unrestored
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