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Long term bad running can cause damage to the plug. There's a few clues can be taken to engine condition, but fueling is quite complex so plugs aren't the way to analyse it
Yes :)
If you live on track and give the engine a very hard life, something more expensive may be worthwhile. For normal road use of a near standard engine any Fully synth will be just fine
yes, take the shafts out first. Be extra careful to pull the short shaft out as straight as possible, it's easy to knock the bearings on the end of the shaft off and if the needles fall into the gearbox you're screwed
brakes are the same as the williams, so not that bad TBH. Suspension is easy, Most people change that on a 172 anyway so what's the difference??
Projects like this are about the building, more than the finished product. I'm VERY interested
could easily have caused it, but if it's still there it sounds unlikely. HT leads are normally quite reliable on the clio but they do fail, or cause a miss sometimes
of course the high comp pistons work fine with them, they have the larger cut-outs. Max lift is NOT the issue, lift at TDC is. Upgrade the map sensor?? how is that going to make the FBW throttle react faster to give you a respectable idle (which you can't get with 421s let alone 422s)
Might have been done with one of the cam-belt kits that only uses a new tensioner and not new idlers. Not something I'd personally do, but i'm yet to see idlers actually fail, so i wouldn't be TOO worried if it is that, but it would explain the lower cost.
Cat 428s for use with the standard inlet IMO. the peak power figure should be about 10bhp up once mapped, but the bigger gain will be the engine keeps pulling towards the redline rather than starting to drop off around 6600.
A 7900 limiter is very high on a stock bottom end, around 7500 should...