[s-cars] EM type, chip upgrades and cracked heads

[Mihnea Cotet]

Oops, sorry for the bad picture, the crack isn't even visible, this one
should be better!

http://www.rs2-club.net/S2R/Images/Culasse2.jpg

Mihnea

At 08:40 12/07/2003 +0200, Mihnea Cotet wrote:
>--
>[ Picked text/plain from multipart/alternative ]
>Dave,
>
>
>In all but one case, all the cracked heads I have seen before were on
>UNCHIPPED engines running bone stock turbos on bone stock EMs. The chipped
>engine was running a kind of "racing" chipset for which many things could
>be blamed but without a real in-depth analysis it would be quite hard to
>determine wether the chipset was responsible or not for the head damage.
>
>Most of the heads that were cracked had those cracks under the exhaust
>valve springs area as in this particular picture
>http://www.rs2-club.net/S2R/Images/Culasse3.jpg, one of them was cracked
>under all 10 valve springs and that was the one driven since new by a
>middle-aged woman, had 50K miles and had stock everything.
>
>So basically, you can draw the conclusion yourself, I for one wouldn't try
>to draw any yet.
>
>
>Cheers,
>
>Mihnea
>
>At 23:04 11/07/2003 -0700, Dave Forgie wrote:
> >Mihnea and others:  When these cracked heads show up, are  there any
> >correlations between the EM type, the turbo, the chip set, etc.?  What I
> >was thinking when I asked the EM question a few days ago was, if you go
> >to an upgraded turbo and/or a chip set that makes 300+ hp and you DO NOT
> >upgrade the EM,  the probability of burning valves, e.g. 1, 3, and/or 5,
> >AND/OR cracking the head (e.g. around the exhaust valves or exhaust port
> >areas) increases dramatically.  I would like to do a litter
> >forensic-type "epidemiology" (sp?) on this data, if it is available.
> >
> >Dave F.
> >
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