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Old 01-04-2013, 12:31 AM   #66 (permalink)
t vago
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Quote:
Originally Posted by ECONORAM View Post
I have not heard of the sonic freeze. Is this a freezing of the air passage due to the Venturi effect of air going through a narrowing in the intake, like the throttle valve?
Yah, it sounds a lot like carburetor icing. I've never heard of the term "sonic freeze," either.

Quote:
Originally Posted by ECONORAM View Post
Glad you like it! I have not decided if I'll take the plunge on a heater core intake mod. I was actually contemplating moving the filter box directly behind the radiator, and removing all the intake turns. Might get another degree or two with it sitting on top of the engine.
The benefit, of using the radiator as an intake heater instead of adding a separate heater core, is that the radiative surface is already there and plumbed in. There's no need to modify the coolant system itself at all.

Of course, it also requires modifying the induction system a bit to route the heated air from the radiator (possibly around many moving parts). Also, the radiator-based heater is dependent on the engine thermostat, which effectively removes any warm-up benefit.

On the other hand, using a separate core requires extra coolant system plumbing. It might also lessen the effectiveness of the existing cabin heater, depending on whether or not the intake heater core was plumbed in-line with the existing heater plumbing. It's debatable how much the heater's effectiveness is affected, though. Meh.

As a practical matter, I've already had to replace one bypass valve because it developed a small leak that caused coolant to drip onto my truck's left header. Stupid bypass valve...
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