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S3 WOT, 2 cylinders lost compression


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  • Gold FFM

@skiing Henry's S3 back after a breakdown that may have been fuel pump.  His breakdown guy got it running but around 30 seconds WOT ensued due to jammed throttle.  So now she's very poorly.  Going to remove head to see what might be going on.  Bouncy valves maybe.  It'll be so much FUN as the car is, putting it mildly, a bit of a mongrel.

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British Fart to Florida, Nude to New York, Dunce to Denmark, Numpty to Newfoundland.  And Shitfaced Silly Sod to Sweden.

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  • Gold FFM

This one's going to need more than magic!  It's bad.  Very bad.  Details later...

British Fart to Florida, Nude to New York, Dunce to Denmark, Numpty to Newfoundland.  And Shitfaced Silly Sod to Sweden.

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  • Gold FFM

I get the feeling balsa was used in this one.

British Fart to Florida, Nude to New York, Dunce to Denmark, Numpty to Newfoundland.  And Shitfaced Silly Sod to Sweden.

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  • Gold FFM

I am currently making sacrifices to the Lotus gods for it to be head only... which I am sure can be whittled from oak?

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2 hours ago, Sparky said:

I get the feeling balsa was used in this one.

Oak in stock

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hindsight: the science that is never wrong

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  • Gold FFM

The Exotics International Board Of Post Censors has rated this post

NOPE

Contains bits of metal, mild owner peril and implied monumental expense

It ain't pretty.

Exhaust valves clearly couldn't keep up.  Photos show the result.  Also some stuff that really winds me up, but I won't comment further on that.  Damage is extensive, and some debris, although minor, is in the sump.  As far as I'm concerned there's only one safe option...

Didn't know Lindt made camshafts.

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Tut tut.

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To avoid an attack of the vapours, look away now...

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Exhaust manifold is soooo much fun.

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So, camshaft, valves, springs, guides, buckets, cam tower - and Lordy knows what once the head is off.  Poor Henry.

  • Sad 11

British Fart to Florida, Nude to New York, Dunce to Denmark, Numpty to Newfoundland.  And Shitfaced Silly Sod to Sweden.

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@Sparky likes Lego, this is similar and about as strong. I  have to admit to being surprised by the cam shaft lobes. I thought the other object would give way much easier  and so not damage those, perhaps goes to show just how bad this particular event was. Chin up @skiing and keep smiling.

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  • Gold FFM

@Bling wide open throttle, no load.  Eventually something will lag behind and valve/piston contact will occur.  Thereafter, mayhem.  I too am shocked at the camshaft in particular.  The amount of shrapnel is phenomenal.  Maybe something substandard in play?

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British Fart to Florida, Nude to New York, Dunce to Denmark, Numpty to Newfoundland.  And Shitfaced Silly Sod to Sweden.

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  • Gold FFM

I have heard of the followers letting go - so agreed, would be sensible. Anyone know where you can get a new exhaust camshaft? Assume it is a 107 one as the engine is HC... 

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Ouch, that looks really messed up, I look forward to the next set of photos from @Sparky to see how the pistons fared. Hope they survived the mayhem.

In answer to your question, and I'm sure you've looked already but the Lotusbits site lists a 107 cam @ £50 and a complete NA HC head inc valves @ £500

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Normally Aspirated - and lovin' it!

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 Well @Sparky ?   I've  not yet seen the photos of the engine having been stripped, parts procured, engine re-assembled and installed, what's been keeping you? I'm thinking you're going to use some excuse like not enough hours in the day for that, or, you've had to eat & sleep.  Your audience awaits.

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  • Gold FFM

Not often you'll hear this, but I concede.  4 downpipes intertwined like spaghetti junction; it's ludicrous.  7 nuts off, 3 on top that are chocolate amd nothing can be got onto them, 2 underneath that are so rusty that they'll have to be ground/chiselled off, if you can get any tool near them.  Two of the pipes pass through the chassis, so neither head nor engine can be removed with them in place.220478748_WhatsAppImage2022-05-25at1_53_53PM.thumb.jpeg.38e3dc4a429681378c161c5295d9d3c0.jpeg

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This needs to go into a workshop facility with air and oxy.  Personally I'd cut the crazy thing off and put something normal on.  It looks like it was fabricated by Salvador Dali's plumber.

Checking under the head is moot anyway.  Given the amount of debris found, everything has to come out for full dismantling/clean/rebuild at the minimum.

 

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British Fart to Florida, Nude to New York, Dunce to Denmark, Numpty to Newfoundland.  And Shitfaced Silly Sod to Sweden.

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  • Gold FFM

I have such, but need to get a load of new bits.  Even then, access to those lower ones is abysmal.  TBH though this system is nightmarish.  It has never fully sealed (6 slipjoints) and is in contact with the chassis in 2 places.  It was never right from the day I met it.  I think it's time to lunch it.

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British Fart to Florida, Nude to New York, Dunce to Denmark, Numpty to Newfoundland.  And Shitfaced Silly Sod to Sweden.

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Time to bin it (the exhaust), for the reasons you've given plus I'm sure I can see holes in it (the pipe next to the one with a jubilee clip). It does sound as though this repair could creep in terms of scope, but resolve several other things at the same time.

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  • Gold FFM

Lunch it!!! I love the noise but will swap

for something which fits a lot easier… 

We all want to see the reciprocating saw at work anyway…

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  • Gold FFM

If you say so!  I shall light the Milwaukee boilers in readiness for a full head of steam tomorrow.

I reckon this'll be pay-per-view as it's quite, er, 'niche'.

Having me peepers tested in the morning.  Hopefully I won't cut the wrong thing off...

British Fart to Florida, Nude to New York, Dunce to Denmark, Numpty to Newfoundland.  And Shitfaced Silly Sod to Sweden.

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So did a P.O. build a bespoke exhaust system onto the engine in situ without any regard for how it might ever be removed in the future?

That reciprocating saw is a thing of beauty in the right hands!

Edited by Choppa
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Normally Aspirated - and lovin' it!

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