S2 NA + Mods

This is where we proud owners can upload information and pictures of our pride-and-joys (their Exige that is..)
winthattt
Posts: 1081
Joined: Fri Feb 12, 2010 4:45 pm
Location: Sunny Derbyshire

andybond wrote: Wed Oct 07, 2020 9:19 pm Cadwell intrigues me and scares me at the same time. Ill put it on my list of tracks to do
Cadwell demands respect, like Goodwood.
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matt447
Posts: 160
Joined: Mon Apr 13, 2020 7:13 pm

Haven't updated this in ages, but I suppose that's because I moved house and haven't had time for the car until recently... I went through my box of parts that had been removed from the car and had a better look at my old (standard) cams... and noticed this on the intake cam!

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Keep in mind, these were standard cams from a 2004 model that had done 30,000 miles when they were removed! All lobes looked flawless, apart from this one - which also showed a really odd patch of metal away from the tip, and then the tip itself had clear wear. Just this one lobe though - all the others were fine! I've got Piper Stage 2 cams now, but I was quite surprised to find this on the standard cams - guess they're just junk now... Interestingly, the car went very well compared to my friend's 2006 111R - he thought that mine was a shade quicker, so definitely wasn't hurting performance in any noticeable way, but just a bit worrying!

The cams were swapped by Lotus main dealer and he didn't mention there were any problems, but now I'm thinking I'm going to have to pull them out and check if there's any wear to the rocker on that cylinder! :roll:
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Fonzey
Posts: 1249
Joined: Tue Nov 27, 2018 12:17 am

Is it Cyl3 by any chance? I seem to recall that being the common one for wiped lobes.

Your pic looks very similar to the ones from my Elise, 2006 and 45kish miles when mine were noticed. I never even took my cam cover off with that car, it was the next owner who discovered the state of the cams.

From what I've heard, generally you either get wiped cams or you don't. And if you get a wiped cam, it can show signs like that as early as 10-15k miles. Jury still out on the cause, but it stinks of a dodgy batch to me based on the inconsistencies from car to car.
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matt447
Posts: 160
Joined: Mon Apr 13, 2020 7:13 pm

Fonzey wrote: Thu Apr 22, 2021 10:04 am Is it Cyl3 by any chance? I seem to recall that being the common one for wiped lobes.

Your pic looks very similar to the ones from my Elise, 2006 and 45kish miles when mine were noticed. I never even took my cam cover off with that car, it was the next owner who discovered the state of the cams.

From what I've heard, generally you either get wiped cams or you don't. And if you get a wiped cam, it can show signs like that as early as 10-15k miles. Jury still out on the cause, but it stinks of a dodgy batch to me based on the inconsistencies from car to car.
Cylinder 1, I think? (closest to the chain). Bit depressed about having to take the camshaft out to check for wear to the rockers, as the tech should've noticed and checked this when the camshaft was installed in the first place - but worse stuff happens, I guess! ;)

Yeah, I also just think there was a duff batch - the metal on the camshaft just doesn't look right away from the tip - like there's something odd about it...
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matt447
Posts: 160
Joined: Mon Apr 13, 2020 7:13 pm

....aaaand, the same lobe of my 2,000 mile old Piper Stage 2 camshaft is now also getting wear on it thanks to the Lotus tech not spotting the original issue and reusing a worn rocker. *sigh* :roll:

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Anyone handy with a set of spanners and have a spare day?
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Fonzey
Posts: 1249
Joined: Tue Nov 27, 2018 12:17 am

I was thinking about this over the weekend, the worn rocker should still be suspect #1 but it might be worth rigging up some sort of test rig for oil flow through the cam cover. I did read about a couple of cam-wipe accounts that showed the squirter hole in the oil pipe was skewed a bit and wasn't spraying evenly on one lobe.
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matt447
Posts: 160
Joined: Mon Apr 13, 2020 7:13 pm

Exciting day today!

Just got back from dropping the car at track-group for some attention after spotting my possible issue...

They'll fit a new rocker, checkout the Piper cam and see if it is okay or not, if not just replace... At the same time, they're taking the head off, fitting new valves for some higher-rpm safety, taking a look at port-matching the head to meet the inlet/exhaust manifold nicely, refitting with the ever-so-slightly thinner Cosworth head gasket (I'll take any compression ratio increase as a win!), putting it all back together with new cam chain, chain slippers, tensioner and intake camshaft sprocket (just to be certain everything is spot on as I have had a strange noise since the lift bolt disappeared down past the chain!) then onto their engine dyno for a proper mapping session and seeing what they can get out of it!

Also getting them to fit a front ARB and braided hoses at the same time... :)

Hopefully should come back even healthier - yay! :thumbup:
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thommo
Posts: 4850
Joined: Tue Jul 13, 2004 12:50 pm
Location: Lancs

Super! Let us know the outcome
Exige S1 No: 139
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Fonzey
Posts: 1249
Joined: Tue Nov 27, 2018 12:17 am

Excellent, who doesn't love a fix with a bit of scope creep? :mrgreen:
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matt447
Posts: 160
Joined: Mon Apr 13, 2020 7:13 pm

Fonzey wrote: Tue May 11, 2021 3:13 pm Excellent, who doesn't love a fix with a bit of scope creep? :mrgreen:
Exactly… why just get it fixed, when you can make it better?! :thumbup:
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