Daniel,
Depends on the motorcycle. My BMW K model is an inline 4 cylinder virtually
identical to a car engine except for the lubrication system since the engine
mounts with the pistons moving sideways instead of up and down. Makes it
very easy to get to both top and bottom end without taking the engine out of
the frame. It has a 3 main bearing crank with big end bearings just alike a
car. Stresses may be different than a car, but the design of many motorcycle
bottom ends is very similar to a car - IE. a crank, main bearings and big
end bearings. In fact, the top end is where some motorcycles differ greatly
from cars - I'm thinking 2 strokes here. Reed valves....etc.
Cheers!!
Jim
On 1/2/08, Daniel1312@aol.com <Daniel1312@aol.com> wrote:
>
> And you change the main and big end bearings every racing season. I'm
> suspicious of the article because I can't imagine the bottom end of a
> motorcycle
> has much in common with the bottom end of car, or have motorcycle engines
> changed in recent years.
>
> Pistons and rings have a lot more in common across motorcycles and cars
> except motorcycles to more high rpm.
>
> As far as the MORE power goes - how long do you get MORE power for - until
> you sell it 12,000 miles later or not as long as that.
>
> Regards
>
> Daniel1312
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