It doesn't change the displacement because the displacement is the swept
volume of the piston, i.e. the space that the piston moves through during
its stroke. That's strictly a function of bore and stroke.
What a domed piston does is extend into the combustion chamber and take up
space above the top of the block. This makes calculating the compression
ratio more complicated for the enthusiast. It's easier for manufacturers to
tweak compression ratio by changing the piston crown than to change the
cylinder head design.
Gordon Glasgow
-----Original Message-----
From: datsun-roadsters-bounces@autox.team.net
[mailto:datsun-roadsters-bounces@autox.team.net] On Behalf Of Joe Kinstle
Sent: Thursday, April 09, 2009 11:31 AM
To: 'Embarq Customer'; datsun-roadsters@autox.team.net
Subject: Re: [Roadsters] long rod (r16) stroker
Wouldn't a high domed piston create less displacement than a flat top or
dished piston?
Joe Kinstle
'68 2L
BLK SRL
Carpenter, not engineer
-----Original Message-----
From: datsun-roadsters-bounces@autox.team.net
[mailto:datsun-roadsters-bounces@autox.team.net] On Behalf Of Embarq
Customer
Sent: Thursday, April 09, 2009 9:57 AM
To: datsun-roadsters@autox.team.net
Subject: Re: [Roadsters] long rod (r16) stroker
The only thing that strokes the motor is a crank. Different rods and
pistons might change the angles between the rod and piston but does not
change the stroke or displacement. To change the displacement you have to
change the stroke or bore.
Andy
----- Original Message -----
From: "Stephen Wan" <steve@olsonarchitect.com>
To: datsun-roadsters@autox.team.net
Sent: Thursday, April 9, 2009 11:03:30 AM GMT -06:00 US/Canada Central
Subject: Re: [Roadsters] long rod (r16) stroker
I think its from the longer distance the piston can travel during the
combustion phase.
The longer downstroke increases the amount of time that the expanding gas
has to turn the crank before reaching BDC per combustion cycle.
Steve
70' 1600 that still needs a tranny swap.
----- Original Message -----
From: "Eddie" <eddietude@socal.rr.com>
To: "Gordon Glasgow" <gsglasgow@comcast.net>
Cc: <datsun-roadsters@autox.team.net>
Sent: Wednesday, April 08, 2009 11:23 PM
Subject: Re: [Roadsters] long rod (r16) stroker
>I thought the longer rod also pushed the piston farther "up" the
> cylinder wall, thus compressing the gas MORE... and that's where the
> power gain came from...
>
> Isn't that also the case?
>
> Eddie
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