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Engine basics => Engine set up tips => Topic started by: Paul Taylor on April 13, 2016, 08:53:01 PM

Title: LA 46 crankshaft different
Post by: Paul Taylor on April 13, 2016, 08:53:01 PM

I got some metal Backplates to swap out on two of my LA 46s.
I noticed the crankshafts were different. I pulled them out and weighed them.
One has a counter weight that looks to be cast the other smooth and machined.
The smooth one is 3 grams heavier.
I did a search and did not find much but found one thread that said something about replacing a LA crank
with a FP crank made a difference and some people added weight to the counter weight.

 (http://uploads.tapatalk-cdn.com/20160414/c8fa890ffc58e4a7b88f8d0067f5b168.jpg)


Thoughts?


Sent from my iPhone using Tapatalk

Title: Re: LA 46 crankshaft different
Post by: Jim Oliver on April 14, 2016, 06:05:40 AM

Paul,
Just wondering if you have any idea of the time of manufacture of the two engines in question?

Of the several LA 46s I have (blue and silver), I think all have the machined shaft.

Jim

Title: Re: LA 46 crankshaft different
Post by: Akihiro Danjo on April 14, 2016, 10:48:50 AM

Left one is a very first lot.

Aki

Title: Re: LA 46 crankshaft different
Post by: Don Hutchinson AMA5402 on April 14, 2016, 01:24:10 PM

It appears to be timed a skosh differently too.

Title: Re: LA 46 crankshaft different
Post by: RandySmith on April 14, 2016, 01:35:12 PM

The early ones had the cast cranks, the later have the heavier ones, they are all still supposed to be for the 35 , 40 FP and  40 46 LA

Randy

Title: Re: LA 46 crankshaft different
Post by: Paul Taylor on April 14, 2016, 01:48:22 PM

Thanks guys.