what can i do to a 998

Smiffy · **Posted:** Tue Dec 27, 2005 2:24 pm

Sorry but that is a load of shite. The amount of metal between the valves makes cracking here highly unlikely. Have you ever seen one ?

drmini in aust · **Posted:** Tue Dec 27, 2005 6:22 pm

Early S heads 12A185, AEG163 often used to crack between the valves because there is SOLID metal there between the exhaust and intake ports. Heat can't transfer into the water easily, so head expands there and cracks.
They fixed this problem- the 12G940 heads bring the water jacket down closer to the valve seats.
But the !2G295 is really an antique head- they came out in 1963 or so. And they are similar to the early S head in so many ways. I doubt 940 style improvements were ever done.
Yes, I have seen one cracked there. :wink:

Smiffy · **Posted:** Tue Dec 27, 2005 8:23 pm

drmini in aust wrote:

Early S heads 12A185, AEG163 often used to crack between the valves because there is SOLID metal there between the exhaust and intake ports. Heat can't transfer into the water easily, so head expands there and cracks.
They fixed this problem- the 12G940 heads bring the water jacket down closer to the valve seats.
But the !2G295 is really an antique head- they came out in 1963 or so. And they are similar to the early S head in so many ways. I doubt 940 style improvements were ever done.
Yes, I have seen one cracked there. :wink:

Early 'S' heads used to crack between the valves because there was hardly any metal there. Afraid you just clutching at straws now to try and prove yourself right here, if it was easier to post pictures I'd sow you what it actually looks like in this area, because it is obvious you haven't actually seen one by that last statement :roll:

The 295 has more in common with the 940 casting than anything else, but witha good 4-5mm between the valves.

marcsvenson · **Posted:** Tue Dec 27, 2005 8:30 pm

Hahaha he hasnt seen one mate i would be suprised if theres much in the ways of minis the doc hasnt seen

its not hard to post pics just save them somewhere like photobucket or something and copy

Smiffy · **Posted:** Tue Dec 27, 2005 8:41 pm

Is that right so why's he talking 'bollocks' then ? On a 163 head you can hardly get your finger nail between the valves and that was why they cracked, where as the 295 has like I said a good 4mm.

marcsvenson · **Posted:** Tue Dec 27, 2005 8:45 pm

mate im not saying either way as i wouldnt know but i do know he has a lot of mini knowledge and im sure hes seen one
himself and THEMINIMAN and a handfull of others on here are a wealth of knowledge

Morris 1100 · **Joined:** Wed Jul 21, 2004 10:32 pm **Posts:** 19124

Smiffy wrote:

On a 163 head you can hardly get your finger nail between the valves and that was why they cracked....

They crack because you can't fit a fingernail between the valves? Wow I thought that there was some metallurgical problem but it turns out to be thick fingernails!

Sure there is not much room between the valves but can you be certain that the crack is caused by that? (I know a lot of engines with valves that close together)

speedy · **Joined:** Fri Jul 08, 2005 8:56 pm **Posts:** 9979

Smiffy wrote:

if it was easier to post pictures I'd sow you what it actually looks like

I'm sure you're clever enough to figure it out :wink:

http://www.ausmini.com/forums/viewtopic.php?t=10405

Oh, and don't forget the Ausmini rule, "Be Nice". :wink:

Smiffy · **Posted:** Tue Dec 27, 2005 9:02 pm

http://www.minifinity.com/index.php?nam ... hlight=295
Here you go mate

cush · **Joined:** Wed Jun 09, 2004 3:35 pm **Posts:** 11847

smiffy, you're foreign... and there might be some members here from the cronulla area*

so it might pay to be carefull..

*actually... they're all from the hills.... so unless they get off the herbs, i think you'll be safe...

Smiffy · **Posted:** Tue Dec 27, 2005 9:49 pm

cush wrote:

smiffy, you're foreign... and there might be some members here from the cronulla area*
so it might pay to be carefull..
*actually... they're all from the hills.... so unless they get off the herbs, i think you'll be safe...

Whats that all about ? Supposed to be a threat ? Tell 'em we meet at the Hayride in Beverley on the first Sunday of the month....... Should I wait in the car park or will they come and find me ?

benjamin · **Posted:** Tue Dec 27, 2005 10:08 pm

who cares everyone has there own opinion stop windging

adeee · **Posted:** Tue Dec 27, 2005 10:15 pm

no...its not a threat...

It's just cush trying to be funny

Smiffy · **Posted:** Tue Dec 27, 2005 10:24 pm

Think I took it in the right context then, but seriously anybodies welcome if your ever over here.
http://www.hullminiowners.co.uk/

drmini in aust · **Posted:** Wed Dec 28, 2005 5:55 am

Smiffy wrote:

drmini in aust wrote:

Early S heads 12A185, AEG163 often used to crack between the valves because there is SOLID metal there between the exhaust and intake ports. Heat can't transfer into the water easily, so head expands there and cracks.
They fixed this problem- the 12G940 heads bring the water jacket down closer to the valve seats.
But the !2G295 is really an antique head- they came out in 1963 or so. And they are similar to the early S head in so many ways. I doubt 940 style improvements were ever done.
Yes, I have seen one cracked there. :wink:

Early 'S' heads used to crack between the valves because there was hardly any metal there. Afraid you just clutching at straws now to try and prove yourself right here, if it was easier to post pictures I'd sow you what it actually looks like in this area, because it is obvious you haven't actually seen one by that last statement :roll:

The 295 has more in common with the 940 casting than anything else, but witha good 4-5mm between the valves.

Mate, I am talking about the water jacket in between the valves, I know there is more solid metal there in the chamber between valves on a 295, but cooling in there is a problem as it IS solid.
Anyhow by the time racers have finished fitting big valves (eg 1275) in a 295 there is less metal there than you say.
BTW I've seen early S heads cut up, 202s, a 295, and a 940.... :wink:

<edit> hey, I'm not saying the 295s all crack there like early S ones tend to, only that they have been known to crack in the heat of competition..
But if ya got `em, run `em...

what can i do to a 998

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