Quote:
Originally Posted by rkreigh
as for the throttle blades icing, yes, driving it below freezing it can happen. but I've NEVER seen it. you can also drive into standing water and hydraulic a piston (that I've SEEN happen)
bypassing the coolant doesn't hurt anything when driving above freezing.
but it doesn't add horsepower, or save weight either. it's a "cosmetic" mod.
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Let me discuss this if I may 
1. I concur with
rkreigh and
Hog that a freezing air flow at WOT can change the geometry of the TB as well as freeze any moisture in that area. Either could cause the TB blades to stick in any position.
I am not sure if TB coolant flow heating could even keep up with WOT air flow cooling.
I guess it all depends on how cold ambient temperatures actually are (are we talking 20 deg F or -20 deg F).
a. It would have been informative if Hog had just let the engine rest for a bit after turning it off to see if heat migrating upward from engine actually released the stuck TB blades.
b. Marc tested the TB function at idle at an air temperature of 20 deg F (90% Humidity) and found that the TB maintained 50 deg F temperature. This experiment is on his web site.
As discussed in......Throttle Body Heat Bypass Line
c. Hog's situation is at WOT which is a completely different issue in terms of air flow and TB blade rotation.
2. The TB coolant is always flowing when the water pump impeller is rotating (except it TB coolant ports are blocked for any reason). That TB coolant flows to the "T" and to the radiator
when the engine has reached operating temperatures. That TB coolant flows both ways (to radiator and coolant purge tank) when the
engine is in the process of reaching operating temperatures. From this one can say........
a. TB coolant flow interferes with radiator air purging during the time the engine is in the process of reaching operating temperature.
3. Many guys and gals flush their radiators to increase radiator coolant flow. The debree/corrosion that decreased radiator coolant flow can also decrease/stop TB coolant flow (the TB coolant ports are very small).....
a. I wonder how many flush their TB coolant flow paths when they flush their radiators?
4. The additional issue that
rkreigh did not mention (cosmetic mod was mentioned) is the advantages of TB blocking (actually Injector Housing Coolant Port blocked just below Plenum) for Plenum Removal......
a. With TB/Injector Housing coolant blocked you can install gaskets dry without having to concern yourself with being exposed to coolant flow.
This means as in my situation I do not have to add permatex on the Plenum gasket and I do not have to torque my SS Allen Head Plenum Bolts all the way down to 19 ft-lbs.
b. This means I do not have to measure to determine when proper amount of coolant is drained to avoid potential Air Pockets (Air Locked Water Pump) when refilling with coolant.
c. What also cleans the clutter (cosmetic mod) of the LT5 is adding an
Oil Catch Can (the Red Canister just in front of the Brake Fluids Reservoirs). This eliminates ALL the Plenum side rail clutter on both sides of the Plenum
There.....I said it....maybe should not have said anything 