Cooling the 4.0.. from inside?

[omega_rugal]

before i start, this is not a request topic, or question or anything, just wanted to share something i noticed...

 

as my signature says, my 4.0 has been running on LPG for over  a year now, best mod i have done to it blah blah blah, i couldn`t find a good place  to put the reducer  but where the air box used to sit, that way the low pressure hose could reach the TB easily but in the same time made plumbing the coolant to the reducer immposible (i tried running the hoses over the engine but in a nut shell, didn`t go well) i tried warming the reducer by using a small pump and some hoses throught the radiator (where the transmission oil usually goes in an automatic) it worked, prevents icing as it should but during last winter proved insuffiecient... so i got an idea: remember the valve cover holes where the PCV thing goes? blowby gasses come out HOT and usually within a minute of starting so i routed one hose to the reducer, that worked wonders, the reducer usually gets a lil cold under load but that`s it, no more ice... it ran that way for a month i was happy with it but as happens with a Jeep, there`s always room for improvement, up to that point i simply routed the used blowby gasses outside the engine bay, but then i realized that they come out cold... so i put second hose to route them back in the air intake... at first nothing happend, it started and ran as usual so i though "meh looks cool, let`s leave it" but after doing some trips i noticed that the engine doesn`t get as hot as it usually does, i mean when i go to work i drive like 6 miles and at that point it`s a normal temp, but now i drive nonstop twice as far and gets less hot than before...

 

so pumping cold air into the TB make sthe engine run cooler? or am i going crazy?

[gogmorgo]

That's the principal of an intercooler on a turbo setup, allowing more pressure without cooking the engine. Although I'm surprised you notice a difference... My MJ runs the same temps at 80°F as it does at -40°F, it just takes a bit longer in the cold. 

[Pete M]

the amount of gasses coming out of that hose pale in comparison to the huge amount of cold air being sucked into the throttle body so I doubt there's a direct connection.  maybe the thermostat went bad?

[omega_rugal]

I has no thermostat, never had, a PO remove it...and for the record, it`s running with no fan, i`m in the middle of installing an efan...

 

and it was 95F today and still is not cooking...

Edited February 27, 2018 by omega_rugal
add more content