VauxSport - Vauxhall advice and chat forum

sbd16v · Joined: 10 Nov 2006 Posts: 2083 1990 Vauxhall Astra

chris

i said i would not be surprised if it was the most power let in the country

i was basing that on chips power at 1.5 bar and speckys power

your going on like a spoilt child because i did not know about the top secret 900bhp let

a question for you chris

should we no longer call speckys the fastest fwd vauxhall in the uk, just incase there is someone else that no one knows about that is faster ???
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Turbo Gav · Posted: Wed Feb 03, 2010 8:16 pm Post subject:

Chris S · Posted: Wed Feb 03, 2010 8:28 pm Post subject:

No u shouldnt stop calling it that because it is.
So stop wereing blinkers

sbd16v · Joined: 10 Nov 2006 Posts: 2083 1990 Vauxhall Astra

fennyLET · Posted: Wed Feb 03, 2010 9:05 pm Post subject:

Chris S · Posted: Wed Feb 03, 2010 9:18 pm Post subject:

GarySRi · Posted: Wed Feb 03, 2010 9:29 pm Post subject:

Theres a lot of love in the room, can you feel it PMSL

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Rick Draper · Joined: 02 Dec 2006 Posts: 839 1993 Vauxhall Nova

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Chris S · Posted: Wed Feb 03, 2010 11:51 pm Post subject:

Davey J · Posted: Thu Feb 04, 2010 8:13 pm Post subject:

At least you killed it having fun fella! Can't argue with that..............

T.F.S. · Joined: 14 Nov 2006 Posts: 974 Location: Londonish

Gsi 16v Turbo · Joined: 29 Jun 2007 Posts: 199

We have build 87mm bore size LET at 2,2 bar and more tha 600 bhp without any problems.
Mine at 2,45 bar,800ps turbo and 750 ps never had this kind of problems.
I've seen allthough LET with T34(Escort Cossie) turbo that faces exactly the same problem with Chip.
He changed the block and never faced the same problem.
So i don't think that this is a problem of the strength of the block.

Something else is wrong...
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C20LET POWER
Astra Gsi Turbo vs GSX-R
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Astra Gsi Turbo vs Toyota Supra
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Chris S · Posted: Fri Feb 05, 2010 4:31 pm Post subject:

Turbo Gav · Posted: Fri Feb 05, 2010 4:32 pm Post subject:

it needs putting back together as it was. I don't think it will happen again.
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Chris S · Posted: Fri Feb 05, 2010 4:37 pm Post subject:

Put sum proper boost threw it n smash timin in

santaclaus · Joined: 12 Feb 2010 Posts: 2

I know this is a bit late , but i hadnt noticed in some of the places that you post chip , whether or not youve posted any kind of indepth autopsy on the motor yet , -
and do you think you would be able to find time to do a detailed analysis into your findings at some later date ?, as im sure it prove educational to myself and many , - at the least it would prove a good read
especially as cracked cylinder walls on let/xe's are bit of a rarity to most-

One thing that did get me Confused

, reading this thread though and all the others places around the web that have taken an interest in the demise of your motor , is the fact that so many are quick to make comparisons in terms of just raw hp with other established engines out there , citing all manner of implied causes based around that , but no one as yet has asked how much torque you were making and at what rpm around the time of failure or how it relates to an engines peak cylinder pressure etc ,

i dare say even relatively equal spec'ed motors can vary to a lesser or greater degree , purely on the factor of setup - e.g cam timing , ignition timing , fueling , manifold lengths , boost capping , exhaust a/r etc etc to create a significant difference in pcp's from one engine to the next , let alone any just the spec'ing of parts

....... i would equally be interested in reading into a pure root and branch analysis / comparisons , In to the very foundations of the manufacturing hereditary of xe / let motors , over the course of known production changes etc etc to look for probable cause in this area ,

e.g for example , even just a simple visual or measured data comparisons between a known group of engines regarding things like core shift during a spectrum of casting runs etc ( which imho are a known notorious anomaly in most manufacturers long production models ) leading to thining of the thicker thrust wall of most engines cylinders , etc etc

All of which i feel could only enrichen most peoples knowledge of this engine , for future reference

chip · Posted: Sat Feb 13, 2010 1:51 am Post subject:

Might chop the back of the block open to expose the back of the crack, but TBH even if I do, Im not really sure what it will tell me, other than what I already know, which is that it is cracked.

Would certainly be interesting to get data on how the blocks vary over the production term, as im sure they do.

Ive only personally tested one previously before I built this engine, and thats a shocking sample size but I only have limited resources sadly like most folk.
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