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Location:
Brisbane
Registered:
February 2003
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what would make turbo manifold run red hot? leanout? very-rich?
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Mon, 12 April 2004 15:58
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sorry if this long winded...
on the way to Dubbo, the RA40 turbo manifold and turbine housing got extremely red hot - scared the crap out of all of us...
prior to this on the day, wilbo & i had been driving/flogging the car all over brisbane yet, several gawks under the bonnet did not result in a "holy shit! it's bloody glowing red hot!" moment (like we got at Warwick at about 10pm)
The smoke we got when pulling up was oil dripping from a split in the turbo drain onto the wastegate - but the evil glowing manifold (pics of that to come soon) was a shocker!
but... when i got the car home and started pulling stuff off it tonight - i find heavy carbon/soot eveywhere in the exhaust side of things - as if driving onto/off the trailer was going to coat everthing with enuf black to paint a house?
I can't check the carbi and i don't really know much about Strombergs CD's (apart from some triumph stuff i found on the 'net) but i was expecting stuff like:
-hard, light-coloured residue (like on exhaust when you do highway drive)
-burnt-out turbo gaskets
-melted/stuffed turbine blades
-stuffed turbo bearing
but i got none of that...
instead i got:
-the gaskets on the turbo (in & out exhaust) were not leaking
-the bearing in turbo seems to have same play as per 2 weeks ago
-the exhaust turbines has no visible damage (e.g. no sagging or missing bits)
-the intake turbine is clean (e.g. front seal intact) and has no debris
-the smoke came from oil on the waste-gate and it had carbon 'stain' like you get from sooty candle flame so i think we were lucky not to have engine fire
-the oil-drain hose (heavy duty black hydraulic hose) had split below turbo which is why wastegate is oil-soaked
- the inlet side flange of wastegate had minor leak so most of the noise must be from the buggered manifold gasket.
-the exhaust manifold/turbine/dump pipe is internally coated with carbon/soot so the short run it got to get on/off trailer while running non-boost with heavy choke must have coated everything, because even the plugs are black
- the manifold is stuffed because when you squeeze the wrap, you can hear it crunch - so a lot of the manifold has turned to ferrous-oxide or similar
i'm going to go EFI and am thinking of sourcing a smaller turbo - CT20 or CT26 or T28 (so i can stick to 10-14psi as an upper limit) - as i think this T04 is way too big for a low-rpm engine ... and dumping the steam-pipe log manifold for a h/duty but narrower pipe manifold with the turbo mounted outside cyl's 2 & 3
here's the pic's so far... but any thoughts on whether:
a dodgy carbi could make all this steel go red hot
a short run with lots of choke would carbon up the entire manifold
the oversized turbo (T04) would have contributed to under-fueling.
pics are here:
http://members.optushome.com.au/mkhala/red_celica/ pdfs/RA40-april%2004-part1/RA40-april%2004-part1.h tml
(there's a CT20 in the pics for comparison)
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| | Subject | Poster | Date |
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what would make turbo manifold run red hot? leanout? very-rich?
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thechuckster | Mon, 12 April 2004 15:58 |
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Re: what would make turbo manifold run red hot? leanout? very-rich?
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TA22 | Mon, 12 April 2004 16:34 |
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Re: what would make turbo manifold run red hot? leanout? very-rich?
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wilbo666 | Mon, 12 April 2004 22:39 |
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Re: what would make turbo manifold run red hot? leanout? very-rich?
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Skip | Mon, 12 April 2004 23:27 |
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Re: what would make turbo manifold run red hot? leanout? very-rich?
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thechuckster | Tue, 13 April 2004 02:00 |
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Re: what would make turbo manifold run red hot? leanout? very-rich?
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RWDboy | Tue, 13 April 2004 02:52 |
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Re: what would make turbo manifold run red hot? leanout? very-rich?
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Skip | Tue, 13 April 2004 04:58 |
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Re: what would make turbo manifold run red hot? leanout? very-rich?
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E30-323ti | Tue, 13 April 2004 09:05 |
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Re: what would make turbo manifold run red hot? leanout? very-rich?
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Toobs | Tue, 13 April 2004 09:16 |
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Re: what would make turbo manifold run red hot? leanout? very-rich?
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Skip | Tue, 13 April 2004 09:21 |
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Re: what would make turbo manifold run red hot? leanout? very-rich?
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thechuckster | Tue, 13 April 2004 14:06 |
