The other point to note is that wrapping a cast iron manifold is likely to make it crack. Ok if you've got an aftermarket SS manifold...
True, but it also has the same effect on SS ones too. Manifold gets hotter, therefore higher expansion due to heat, therefore more stress, therefore more likely to crack.
lmfracing said:
WRC flames more because they run antilag, which basically promotes combustion in the exhaust manifold to keep the turbo spinning.
Nothing to do with wrap.
As long as the exhaust is above the ignition temperature, then flames will happen provided the right mixture strength is present in the exhaust.:drivin:
nemo said:
And the other important point is one of simple physics - you can only slow down the heat transfer, not stop it completely, and if it takes longer for the heat to bleed through the lagging to the engine bay, it's going to take longer for it all to cool down too. There's a reason it's not done in the factory you know!
Factory don't use wrap tape, because it lasts all of 12 months in normal dailly driving, and looks tatty in 5, but they do heat wrap. They use a thin alluminium skin shield, and some use glass wadding between that and exhaust pipe. Just look at the stock skyline exhaust. But it is probably not for performance gain reasons.