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weewheels

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n ireland killyleagh

4th Mar, 2007 at 11:07:54pm

does anyone know the cc of a standard 998 head i take it is mmore than a 12g940 head. cheers.

I'm stupid Ive A fiesta with most of the bits to make my megajolt thingy. Thick or what!!!! OHHHHH and ive got a metro for free !!!!! Metros have become rare over here!!!!!!!!!
http://s216.photobucket.com/albums/cc273/weewheels_2007/

wil_h

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Betwix Harrogate and York

5th Mar, 2007 at 12:29:53pm

Although Vizard doesn't state th e998 head specifically I think its 24.5cc

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

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On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination,
talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol

On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry.


hario

444 Posts
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26th Jun, 2008 at 01:04:43am

""However, one thing you should appreciate is that the open chamber small bore heads have the largest combustion chamber of all heads at 28.3cc.""
vizard humself..
""On the other hand, a 12G940 casting starts off life at 21.4cc""
so pocketing a 998 and fitting a largebpre head means adding 6.9cc's..
*happy*

Edited by hario on 26th Jun, 2008.


Ben H

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Melton Mowbray, Pie Country

26th Jun, 2008 at 08:02:45am

On 26th Jun, 2008 hario said:
""However, one thing you should appreciate is that the open chamber small bore heads have the largest combustion chamber of all heads at 28.3cc.""
vizard humself..
""On the other hand, a 12G940 casting starts off life at 21.4cc""
so pocketing a 998 and fitting a largebpre head means adding 6.9cc's..
*happy*


28.3cc might be a 12G295 head, but not a standard 998.

According to the above the pockets will be 28.3-21.4+6.9 = 13.8cc. That is a mighty big pocket!

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hario

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26th Jun, 2008 at 11:54:42pm

ring land volume is approx 2cc gasket volume another 2cc
small dish, dished pistons are 6cc i think?

Ben H

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Melton Mowbray, Pie Country

27th Jun, 2008 at 07:54:05am

On 26th Jun, 2008 hario said:
ring land volume is approx 2cc gasket volume another 2cc
small dish, dished pistons are 6cc i think?


Sorry I am being an arse, but what are you saying here?

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http://www.hillclimbandsprint.co.uk/default.asp

A man without a project is like a like a woman without a shopping list.

hario

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27th Jun, 2008 at 07:38:39pm

sorry i was just trying to out do you.. *tongue*
i was waiting on my pipette kit in the post so i can get some hardfacts down but theyre out of stock..

ring land volume is the capacity between the piston and the bore in the space between the top piston ring and the top of the piston crown..
gasket volume is part of the combustion chamber,
eg. 65mm bore with 1mm thick headgasket (copper) then

π(3.14) x radius of bore(3.25cm) squared, times depth(0.01cm)

somethink somethink.. too wasted.

Edited by hario on 14th Jul, 2008.

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