Greg_B said:Maybe it's as simple as they had well designed heads...
Where's our friend from England, who started the Surf board...some folks there have compared heads and noted changes. I believe he mentioned this in a few of his posts.
gb
Greg.
Yes the newer heads have measurably more meat on the face, don't seem to have the problems. However again the cooling system on the 2LT/2LTE engine is marginal at best, lots of things can be done to improve it including a bigger radiator - need to have a fixed fan for that though as the clearance is not enough.
Bigger exhaust does help to keep the EGTs down, removing the EGR (or blocking it) helps to even out the side to side head temps.
But main thingas a start is to make sure that everything is 100% - squaky clean cooling system, good quality coolant, DEI Radiator releif, make sure the Thermostat is up to scratch (and don't just remove it as that makes things worse), good quality radiator cap - get a 1.1 bar one if you can, make sure that all air bubbles are removed from the system - the 2LT/2LTE is a PITA to bleed the system. Also if you are at all unsure, replace the water pump, they suffer from erosion due to cavitation fairly quickly and this ruins the water circulation.
Also install a secondary water temp guage in the bottom hose - the main one is too high in the system and if you lose even a small amount of coolant, it doesn't get any around it and so fails to register when the heat is climbing until it is way too late.
Also if you do overheat, allow the engine to cool slowly - don't fill it with cold water, leave it for 4 hours or more and then refill slowly. To rapid cooling will crack the head as sure as giving it a smack with a 10lb lump hammer.
