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Discussion Starter · #1 ·
hello boy..this is the ex cam pulley of my k20a2 it weight oem 832 grams, 0,832 kg



i have worked it because the k24 have a light pulley on the ex cam..
and i have reach a value of weight abou 514 grams, 0,514 kg



and the weight..

 
G

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This is just a thought I have: There must be a reason why Honda engineers dictated that the K20A/Z gear must be heavier than the K24 unit and I would suspect it has something to do with some of the following factors...

1.) 50-degree VTEC: Perhaps the extra mass is advantageous with the overlap. No native K24 goes this far in advance.

2.) 1,000 more rpm's rev limit: Maybe a harmonic is generated that requires extra mass to control?

3.) Cam characteristics that we don't know about.

Anyway, I guess my thinking is that there probably is a good reason why Honda does this for the K20's and since it has never been shown to rob power, why try to fix what isn't broken?
 

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Discussion Starter · #7 ·
i think isn't good have a mass weight in rotation in all the part of the engine...
why you lightweight the cranckshaft??
and why the flywhell??
and why the crankpulley???why use a retainers titanium on valve spring?
is the same issue...
this is a na engine for high rpm like than the bike...
if are turbo is a reason for have weight to move in rotation but with na is not good!!!!
i don't think is possible they broken worked in this picture..i not worked the maximun possible..but only a bit..!

i think is very interesting speak about this..
 
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