[xBhp Universal Thread]: What is "shaving the head"? - xBhp.com : The Global Indian Biking Community

Bibhu · 07-21-2009, 09:20 AM

I have a small ity bity question. What is "shaving the head"?

ken cool · 07-21-2009, 09:55 AM

Query Approved

Bibhu · 07-21-2009, 10:33 AM

My thanks goes to Mr. Cool.

Praful · 07-21-2009, 10:37 AM

And I thought this is going to be thread about shaving the cylinder head...

ttg · 07-21-2009, 10:41 AM

You remove a little metal, maybe a couple of mm from the underside of the cylinder head bringing the combustion chamber roof lower & effectively reducing the combustion chamber volume & so increasing the compression ratio.
Higher comp translates to a few good things
For the methods and ohter finer details, wait for the pros.

err, Maybe going by MR vipin_s ' logic, you apply a little lather on the fins on top of the head and shave them off with some machine he's got.

(Mods, pls.. couldn't resist)

Bibhu · 07-21-2009, 10:46 AM

Hum........ kind of hard to find hair on the head of my bike's engine.

So I shave the area near the head gasket? is it ok to do it on a P200 cylinder?

vipin_s · 07-21-2009, 10:46 AM

@praful/bibhu : hope few had some laughs !!Thanks

ttg :

Bhibu : Shaving is just removing material from the flat 'butting' surface of the cylinder head on a milling machine. It's termed shaving as the amount of material removed is very less, normally in few millimeters.
Shaving of cylinder head is done to increase compression ratio of the engine and for other performance modification.

To remove fraction of millimeters, grinding of surface is done !!

k_tornado_sj · 07-21-2009, 10:48 AM

Quote:

Originally Posted by Bibhu

Hum........ kind of hard to find hair on the head of my bike's engine.

lol........

Bibhu · 07-21-2009, 11:01 AM

Ok, why I am asking this?

Reason: as posted in another thread I am planning to do some Mods to my 180cl to make it radical( by 180 standards.)

I have come with a plan to install a 200 cylinder on the cl gear box with some clutch mod. ( turbo is still on the cards but seems unlikely).

Will shaving the head help in increasing usable power?

iorhld · 07-21-2009, 02:37 PM

Quote:

Originally Posted by ttg

You remove a little metal, maybe a couple of mm from the underside of the cylinder head bringing the combustion chamber roof lower & effectively reducing the combustion chamber volume & so increasing the compression ratio.
Higher comp translates to a few good things

how does shaving increase the compression ratio?shaving will just increase the volume of the cylinder or the effective combustion chamber.how does shaving brings the roof lower? i thought the opposite was true or adding a layer of metal to the upper head will result in more squeezing of the air trapped in between the piston and the cylinder head thus increasing the compression ratio.

please enlighten me,i may be completely wrong or maybe i didn't get what you are actually trying to say.
also what is polishing the heads? is it same as shaving the head?

07-21-2009, 09:20 AM	#1 (permalink)
Bibhu Biker reborn Join Date: May 2009 Location: Cuttack Posts: 438	What is "shaving the head"? I have a small ity bity question. What is "shaving the head"?

07-21-2009, 09:55 AM	#2 (permalink)
ken cool Super Moderator Join Date: Sep 2005 Location: New Delhi Posts: 4,677	Query Approved __________________ The Wheel was a great invention; Two Wheels with a Motor in between was even better! BMW Motorrad Days 2011 Xbhp's Indo-French Kashmir-Ladakh Tour

07-21-2009, 10:37 AM	#4 (permalink)
Praful Senior Member Join Date: Jan 2007 Location: Bangalore Posts: 4,136	And I thought this is going to be thread about shaving the cylinder head... __________________ LoneWolfRides®

07-21-2009, 10:41 AM	#5 (permalink)
ttg just a freak Join Date: Apr 2009 Location: KL-7 - KL-1 Posts: 91	You remove a little metal, maybe a couple of mm from the underside of the cylinder head bringing the combustion chamber roof lower & effectively reducing the combustion chamber volume & so increasing the compression ratio. Higher comp translates to a few good things For the methods and ohter finer details, wait for the pros. err, Maybe going by MR vipin_s ' logic, you apply a little lather on the fins on top of the head and shave them off with some machine he's got. (Mods, pls.. couldn't resist) Last edited by ttg; 07-21-2009 at 10:44 AM.

07-21-2009, 10:46 AM	#6 (permalink)
Bibhu Biker reborn Join Date: May 2009 Location: Cuttack Posts: 438	Hum........ kind of hard to find hair on the head of my bike's engine. So I shave the area near the head gasket? is it ok to do it on a P200 cylinder? Last edited by Bibhu; 07-21-2009 at 10:50 AM.

07-21-2009, 10:33 AM	#3 (permalink)
Bibhu Biker reborn Join Date: May 2009 Location: Cuttack Posts: 438	My thanks goes to Mr. Cool.

07-21-2009, 10:46 AM	#7 (permalink)
vipin_s Senior Member Join Date: Mar 2009 Location: Bengaluru Posts: 1,293	What is "shaving the cylinder head"? @praful/bibhu : hope few had some laughs !!Thanks ttg : Bhibu : Shaving is just removing material from the flat 'butting' surface of the cylinder head on a milling machine. It's termed shaving as the amount of material removed is very less, normally in few millimeters. Shaving of cylinder head is done to increase compression ratio of the engine and for other performance modification. To remove fraction of millimeters, grinding of surface is done !!

07-21-2009, 11:01 AM	#9 (permalink)
Bibhu Biker reborn Join Date: May 2009 Location: Cuttack Posts: 438	Ok, why I am asking this? Reason: as posted in another thread I am planning to do some Mods to my 180cl to make it radical( by 180 standards.) I have come with a plan to install a 200 cylinder on the cl gear box with some clutch mod. ( turbo is still on the cards but seems unlikely). Will shaving the head help in increasing usable power?

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