LLY Overheating Issue
I've been reading TheDieselPlace.com, as well as on this forum, about the Chevy LLY motor and its overheating issues. The last couple of times I've pulled in the mountains I've experienced the proble...
Forum Discussion
I attempted to buy from killerbee, but he has some serious communication issues - he would take weeks to respond to an email, if at all. If you search for his name you will find far more unhappy customers then happy ones - it's your money.
I ended up reading this, and buying one. Within 2 weeks from ordering it was on my truck (LBZ).
What I have gathered on the LLY's is there are two problems (all share the third). There was an increase in power (fueling) from the lb7 to the lly, and no increase in cooling to go with it. There is a severe issue with the inlet to the turbo on the lly that was fixed on the lbz. The third issue that all years share is recycling heat from the radiator to the intake.
The AUX radiator made a huge difference (in all fairness KB's kit would be similar) on cooling. Swapping the lbz filter and plumbing in place of your lly's will make the turbo more efficient, help a little in the power, and a lot in the overheating.
I ended up getting a banks cold air intake with super scoop to keep the hot under hood air out of the intake.
I find that keeping ALL the radiator heat out of the air filter helps with egt's and ect's. The hotter filter air temps, the harder the turbo works to make boost. The harder the turbo works the hotter the turbo outlet air. The hotter the turbo outlet air, the hotter the intercooler. The intercooler "preheats" the air going to the main radiator - the hotter the air going into the radiator, the less heat it can dump into the air - higher coolant temps. The hotter air leaving the intercooler and into the engine the hotter combustion - higher coolant temps and EGT's. High Engine Coolant Temps cause the radiator to run hot, which makes the cooling fan run on high, which forces hot air onto and into the stock air filter housing, and into the turbo. That is the heat recycling I was walking about.
I ended up reading this, and buying one. Within 2 weeks from ordering it was on my truck (LBZ).
What I have gathered on the LLY's is there are two problems (all share the third). There was an increase in power (fueling) from the lb7 to the lly, and no increase in cooling to go with it. There is a severe issue with the inlet to the turbo on the lly that was fixed on the lbz. The third issue that all years share is recycling heat from the radiator to the intake.
The AUX radiator made a huge difference (in all fairness KB's kit would be similar) on cooling. Swapping the lbz filter and plumbing in place of your lly's will make the turbo more efficient, help a little in the power, and a lot in the overheating.
I ended up getting a banks cold air intake with super scoop to keep the hot under hood air out of the intake.
I find that keeping ALL the radiator heat out of the air filter helps with egt's and ect's. The hotter filter air temps, the harder the turbo works to make boost. The harder the turbo works the hotter the turbo outlet air. The hotter the turbo outlet air, the hotter the intercooler. The intercooler "preheats" the air going to the main radiator - the hotter the air going into the radiator, the less heat it can dump into the air - higher coolant temps. The hotter air leaving the intercooler and into the engine the hotter combustion - higher coolant temps and EGT's. High Engine Coolant Temps cause the radiator to run hot, which makes the cooling fan run on high, which forces hot air onto and into the stock air filter housing, and into the turbo. That is the heat recycling I was walking about.
