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**Aryan** · 03-13-2010, 10:42 PM

Query Approved.

**jd666** · 03-14-2010, 12:54 AM

you could machine the face of the piston, but that would bump your compression up as well.

you can experiment with drilling holes, but the weight loss would be marginal and remember that with the weight loss, the bike will rev faster, but will lose out on low end torque, and will develop a lesser amount of torque.

**rambo** · 03-14-2010, 01:42 AM

according to me....reducing the weight of the piston is not a simple thing...
every machine component is designed according to many aspects and its various dimensions are then calculated....shaving off any metal would tend to reduce the strength of the material...
Also...the red squares that you have high lighted are the piston skirts...they take the thrust of the combustion,they also guide the piston crown....it cannot be shaved off...

**bik3r** · 03-14-2010, 01:53 AM

Originally posted by jd666 View Post

you could machine the face of the piston, but that would bump your compression up as well.

you can experiment with drilling holes, but the weight loss would be marginal and remember that with the weight loss, the bike will rev faster, but will lose out on low end torque, and will develop a lesser amount of torque.

does it means,this mod will enhance the high end rpm but will eat out the low end (which i like very much in city riding).

any other mod u recommend

thanks

**bik3r** · 03-14-2010, 02:06 AM

@ rambo

i think ur rite, i have to study more on it

i talked with my friend , he's a mechanical engineer
he said if anyone can shave off the red high lighted part, it would be difficult to balance it not even computerised lathe balancing, and an unbalanced piston can make huge damage

**viv.nomad** · 03-14-2010, 02:28 AM

Originally posted by jd666 View Post

you could machine the face of the piston, but that would bump your compression up as well.

you can experiment with drilling holes, but the weight loss would be marginal and remember that with the weight loss, the bike will rev faster, but will lose out on low end torque, and will develop a lesser amount of torque.

but man facing piston means more volume at TDC meas less compression ...

**jd666** · 03-14-2010, 02:29 AM

your volume at BDC will also increase... actually u are right, it should decrease the compression ratio, but shaving the piston face generally increases the compression ( maybe the head is shaved too!! )

**viv.nomad** · 03-14-2010, 03:22 AM

Ya thats what i was saying, your TDC volume will actually increase the clearance volume , swept volume will remain same irrespective of inc at your BDC.
shaving cylinder effctiely reduces ur CV ...hence better CR.

**bik3r** · 03-14-2010, 01:29 PM

Originally posted by viv.nomad View Post

Ya thats what i was saying, your TDC volume will actually increase the clearance volume , swept volume will remain same irrespective of inc at your BDC.
shaving cylinder effctiely reduces ur CV ...hence better CR.

i'm a bit confused here if CV increases, CR will be down, and if head is shaved CR will increases in both case shaving head or piston , CR will increases means lower compression ratio

**viv.nomad** · 03-28-2010, 07:36 PM

another thing u can do is experiment with drilling small hole not more then 2mm dia ... on piston skirt , that way not only weight will reduce but it will reduce frictional losses as well ; i feel bike should rev faster & FE should go up ... never tried myself though . proceed with caution.

**unspoken91** · 04-03-2010, 07:22 PM

As others said making the changes you want to do must be done by some professional.
N for reducing the weight of the piston try getting a T-slot on the piston skirt.
It will help you get better REVs.
IT also will reduce frictional losses due to expansion of the piston because when the piston expands the T-slot which is cut will reduce.
When the piston is back to normal temp then the slot remains in the shape it was initially cut.

**viv.nomad** · 04-03-2010, 08:28 PM

^^ it will mke the piston weak and moreover after expansion the T-slot will actually expand it wont shrink.... so there twice as much denger then just drilling holes ....

**unspoken91** · 04-03-2010, 09:42 PM

^^ . I agree with what you said but according to my knowledge in the combustion chamber with a piston having t-slot , when the piston expands due to over heating of the engine the t-slot provided takes the heat which in turn starts covering the slot slowly.
I dont exactly no if i am rite. But this is what i have heard from many.

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