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Home > General Chat > These pistons any good? Bore sizes

iain
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Sold the turbo and seeing what the C20XE can do!

Near Lincoln

12th Nov, 2003 at 01:57:10pm

http://www.minispares.com/web/Item/P22357%2D40/InvDetail.cfm

Just wondering whether to go +40 since the block ive got is in good nick but has already had a +20 rebore. I want things to be nice and fresh.

Or should i go with the omega pistons (not forged) but i believe these are only available in +20?

Is a +40 going to be reliable? If not then ill find a previously unbored block and go +20


AlexF2003

5795 Posts
Member #: 80
AFRacing LTD

Newbury, Berks

12th Nov, 2003 at 02:39:07pm

your going to end up with a high CR thou... remember that for each rebore, you end up with a higher CR... those extra cc's of displacement have to go somewhere!

Other than that, 40 thou should be ok on a std ish turbo... which I assume ur going for with the std CR.

alex

AlexF

minimark

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newcastle

12th Nov, 2003 at 09:32:17pm

mmmmmmmmmm
explain that one to me please again
if you overbore your block your c/r goes up
mmmmmmmmmm
if your block face to piston height stays the same.
explain how the extra volume ( ok i know its a small amount ) makes your c/r go up???????????????????????
As for +40 bore
At 20 psi , 8/1 c/r and 5 years of abuse mine seems to run ok

Everyone knows that instructions only have to be read if the thing doesn't work....


Turbo Phil

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My sister is so fit I won't show anyone her picture

Lake District

12th Nov, 2003 at 10:43:15pm

The bigger diameter the pistons,the greater the swept volume, meaning greater combustion chamber volume required for given compression ratio.
So say you had an engine and took it out to 1310 or whatever, and left everything else the same inc volume above the piston you would have a higher c/r so would have to run slightly lower boost.

Phil. *smiley*

WWW.TURBO-MINI.COM


minimark

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newcastle

12th Nov, 2003 at 11:37:16pm

sorry i stand totally corected
much humble pie
thick geordie

Everyone knows that instructions only have to be read if the thing doesn't work....


AlexF2003

5795 Posts
Member #: 80
AFRacing LTD

Newbury, Berks

13th Nov, 2003 at 08:46:40am

lol its ok its not obvious...

same area to sqeeze more cc's into :)

alex

AlexF

Jimster
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455bhp per ton
12 sec 1/4 mile road legal mini

Sunny Bridgend, South Wales

13th Nov, 2003 at 06:21:16pm

stupid arsehole! northern monkey!
lol
sorted those toys yet Mark?

Team Racing

On 15th May, 2009 TurboDave said:
I think the welsh one has it right!


1st to provide running proof
of turbo twinkie in a car and first to
run a 1/4 in one!!

Is your data backed up?? one extra month free for all Turbo minis members, PM me for detials

Vegard

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I pick holes in everything..

Chief ancient post excavator

Norway

6th May, 2009 at 11:29:23am

Aaah, resurrection at its very best.

What is the general consencus on the 22357 pistons??

http://www.minispares.com/Product.aspx?ty=...BO%20MEGA%209...

I'm building a new turbo engine in a while, and these might be appropriate for me. Any info? Iain??

On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem.

Sprocket

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11046 Posts
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Preston On The Brook

6th May, 2009 at 11:42:29am

5 1/2 years!!! lol

On 26th Oct, 2004 TurboDave16v said:
 Is it A-Series only? I think it should be...
So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'...


On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........
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