29-01-2013, 06:32 PM
But as he even pointed out, he ran it once at 200hp on the dyno and the rest he ran it at much less...
They're reasonably reliable... The problem is that most people can't resist cranking that extra 1/4 of a turn, that extra 2lbs of boost, finding they have an extra 10hp, but the EGTs are sky high, the boost has gone up, so has the backpressure... The coolant starts getting very hot, very quickly etc, cylinder pressures are rising at an exponential rate, the head gasket will go under those conditions... The rods don't like it either... Sadly you can NEVER put a figure on French conrods, they blew on 90hp 100% original engines cruising...
People attribute failures to one time and place, but mostly the damage is caused over many miles, often hundreds of miles ago the real damage was done, but after another 200 miles of fatigue and stress, they finally give in whilst cruising down the M5...
They're reasonably reliable... The problem is that most people can't resist cranking that extra 1/4 of a turn, that extra 2lbs of boost, finding they have an extra 10hp, but the EGTs are sky high, the boost has gone up, so has the backpressure... The coolant starts getting very hot, very quickly etc, cylinder pressures are rising at an exponential rate, the head gasket will go under those conditions... The rods don't like it either... Sadly you can NEVER put a figure on French conrods, they blew on 90hp 100% original engines cruising...
People attribute failures to one time and place, but mostly the damage is caused over many miles, often hundreds of miles ago the real damage was done, but after another 200 miles of fatigue and stress, they finally give in whilst cruising down the M5...
