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kululadotgroen
Re: GX cylinder head modifications advice needed.
#21
No life (a.k.a. DattoMaster)
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1200gxman did say that he aims to achieve that if;

Quote:
8500rpm ability if engine is balanced and right cam is used.

Posted on: 2007/4/14 22:46
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1200 GX Sedan
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196.5KW/283NM
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400m - 12.3s
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killer1200
Re: GX cylinder head modifications advice needed.
#22
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Quote:

1200GXman wrote:
Forgot to mention.
BMW intake valves = 40mm
BMW exhaust valves = 37mm

I think this might be a little big for a A12 engine.

Thanks for the suggestion kulula.
I am still thinking what to do.


What bore size are you running.

My maths says on a 78mm bore you want:
intake valves = 40.5mm
exhaust valves = 30.5mm

I know 30.5 sounds small but thats what you want most people oversize there exhaust valves thus slowing down the air speed in the port and killing the engine.

Posted on: 2007/4/14 22:53
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1200GXman
Re: GX cylinder head modifications advice needed.
#23
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I may be wrong, but I think that the BMW valves will be way to big for the engine cc's.
It is going to be bored one oversize and then will come out at very close to 1200cc.
These BMW valve story I think will be better suited to A15 size engines.
Going to quickly PM boofhead to find out what size his valves are on his A12.
Will post it here when I got the info.
Thanks so far for the replies.

Posted on: 2007/4/15 11:03
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boofhead
Re: GX cylinder head modifications advice needed.
#24
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my inlets are 35mm and the exhasuts are 29mm nissan items in a A12gx kidney chambered head with new standard gx double valve springs

hey killer ... what does your math say for a 74mm bore ??

Posted on: 2007/4/15 11:26
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kale
Re: GX cylinder head modifications advice needed.
#25
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[img]http://datsun1200.com/modules/myalbum/photo.php?lid=12143[/img]


this is what you want for an a15 - 42mm inlets and 33mm exhaust valves this head allows 81kw at the wheels

Posted on: 2007/4/15 11:46
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boofhead
Re: GX cylinder head modifications advice needed.
#26
No life (a.k.a. DattoMaster)
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Open in new window

Posted on: 2007/4/15 11:51
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killer1200
Re: GX cylinder head modifications advice needed.
#27
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Quote:

boofhead wrote:

hey killer ... what does your math say for a 74mm bore ??


intake valves =38.5mm
exhaust valves =29.3mm

intake seat ID =34.65mm
exhaust seat ID =26.4mm.

Posted on: 2007/4/15 11:54
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1200GXman
Re: GX cylinder head modifications advice needed.
#28
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What are A15 standard valve sizes?

Posted on: 2007/4/15 11:59
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sparkyZA
Re: GX cylinder head modifications advice needed.
#29
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I still have std. A15 valves in my head as well. Pm me the guy that can do the bmw valves number please. thanks

Posted on: 2007/4/15 14:25
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