head question

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Feb 18, 2008 | 09:51 PM

92gt50

Thread Starter

1st Gear Member

Joined: Jul 2007

Posts: 54

head question

what will make more power having a head with a 58cc combustion chamber and 13 compression ratio or a 72cc combustion chamber with 11 compression ratio. naturally aspired

Feb 18, 2008 | 09:53 PM

mjr46

D.R. THE PATHETIC DORK

Joined: Jun 2007

Posts: 30,871

From: West Virginia

RE: head question

it all depends on the rest of the build but all things being equal... the 13 to 1 should be

Feb 18, 2008 | 09:58 PM

AdderMk2

Banned

Joined: Dec 2005

Posts: 22,374

From: Lil' Rhody

RE: head question

higher compression ratio usually nets higher power

also, a motor with 58cc heads with 11:1 compression versus a motor with 72cc heads and 11:1 compression...

the 58cc headed motor would make better power

(figure that one out)

Feb 18, 2008 | 10:15 PM

5spd GT

3rd Gear Member

Joined: Sep 2007

Posts: 798

From:

RE: head question

The 13:1 will win out.

Dish pistons are SLIGHTLY better at pulling in a bit more air. Just something Nascar used for a few more HP.

Feb 19, 2008 | 04:25 AM

greenstreak9205

4th Gear Member

Joined: May 2006

Posts: 1,485

From: Waterford, WI

RE: head question

Quote:

ORIGINAL: AdderMk2

higher compression ratio usually nets higher power

also, a motor with 58cc heads with 11:1 compression versus a motor with 72cc heads and 11:1 compression...

the 58cc headed motor would make better power

(figure that one out)

better piston design should make it a bit more correct?

Feb 19, 2008 | 09:37 AM

5spd GT

3rd Gear Member

Joined: Sep 2007

Posts: 798

From:

RE: head question

There is more volume to be decompressed when the piston is moving downwards while under dynamic conditions (air is incoming).

Compression ratio is simply a static scenario of air.