measuring CR
Turbo Mini Forums

searched but found nothing relevant

how do i actually phisiclly measure CR?

do i fill the bore with oil?
do i put a spark plug in the head chamber?
etc
etc


thanks
tom

Warning:Stig in Training


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Here is a calculator I found.

http://www.csgnetwork.com/compcalc.html

Edited by moke\'n\'andy on 14th Jun, 2007.

May you have the wind in your hair and your wheels on the ground.

Get Vizards "Tuning the A-Series engine", that will answer this and many more questions. Well worth the money, invauable for any A-Series tuner :)

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buy from here in confidence
this is the book

http://www.amazon.co.uk/Tuning-Engine-Defi...y/dp/1859606202

you are better off purchacing another book as well ??? as you will get the shipping for free!

heres a good one ........ http://www.amazon.co.uk/Maximum-Boost-Turb...7975074-7252461

Edited by BENROSS on 15th Jun, 2007.

ill tell the olds thats what i want for my birth day

but i cant wait a month to measure my cr can i??/

Warning:Stig in Training


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Hi,
Do a search on here.
I've seen something about a cd, some grease, and a measuring device.
You can't measure CR with the head on
Cheers,
Gavin :)

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i must be totally shit at searching bat
cos i found absolutley nothing

anyone got a link?

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"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

lmao joey
but patience is a virtue i am not in possesion of you see

and you gotta bite when the ethusiasim is high or you just lose interest

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Hi,
IIRC smear some grease around the edge of the head chamber, stick your CD ontop, then fill it up with a syringe of water until the water is level with the hole.
The ml of water you put in gives you your chamber CC.
Then you just need bore and stroke, piston dish CC and HG volume, 4cc?
Cheers,
Gavin :)

VEMs Authorised Installer / Re-seller. K head kits now available!

WB/EGT gauges. Click here for customers write-up

Visit www.doyouneedabrain.co.uk

My Mini build diary

Bat you rock

but having measured the cc and added them all up how do ya convert it to a CR ratio?

Warning:Stig in Training


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Hi,
Use the calculator in the link above, posted by moke n andy
You only need the CC from 1 chamber not all of them added together.
Cheers,
Gavin :)

VEMs Authorised Installer / Re-seller. K head kits now available!

WB/EGT gauges. Click here for customers write-up

Visit www.doyouneedabrain.co.uk

My Mini build diary

i mean after adding up the cc from the chamber and the piston and the bore

thanks again

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On 15th of Jun, 2007 at 07:04pm Bat said:
Hi,
Do a search on here.
I've seen something about a cd, some grease, and a measuring device.
You can't measure CR with the head on
Cheers,
Gavin :)

https://www.facebook.com/pages/Fusion-Fabri..._homepage_panel

www.fusionfabs.co.uk



1/4mile in 13.2sec @ 111 terminal on 15psi

CR = (Swept volume + Unswept Volume) / Unswept Volume

Swept volume = Engine cc / 4

Unswept = Chamber cc + Piston Dish cc + gasket Volume.

Easy!!

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

nice one wil

i luv math
8)

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and for the bore
i suppose i get no i piston down to bdc smear some grease tween piston and bore and fill it up with oil right?

Warning:Stig in Training


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Don't know what you're on about there.

You can calculate the cc of the engine (or 1 cylinder) from the bore diameter and stroke. No need to measure it by filling as it's an easy calc to find the volume of a uniform cylinder.

If you happen to know your engine cc, then divide it by 4 to get the volume of 1 cylinder.

The only reason you fill the head chambers to measure them is because they are not uniform.

Edited by wil_h on 20th Jun, 2007.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

bloody hell
im never quite so stupid as when im being smart

thanks for straightening me out wil

Edited by Lone Wolf on 20th Jun, 2007.

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If your type up your measurements i'll wok it out for you and put up the calcs. :)

https://www.facebook.com/pages/Fusion-Fabri..._homepage_panel

www.fusionfabs.co.uk



1/4mile in 13.2sec @ 111 terminal on 15psi

46-32-42 LOL!

https://www.facebook.com/pages/Fusion-Fabri..._homepage_panel

www.fusionfabs.co.uk



1/4mile in 13.2sec @ 111 terminal on 15psi

ive yet to buy the oil for the measuring
and i need to find the head
and get myself a syringe

blame the heat!!

nice figure btw
your bf muxt be way proud

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