The hoses are actually different sizes on each side, but I was able to get a 3/8 to fit. The right side hose is tight.
As far as results, it is more benefical in hot climates, not from a horsepower gain, but more from a consistency standpoint. The throttle body does not get heated from high coolant temps.
In cold climates, it is not recommended at all. There are some dangers involving ice forming. Do a search to learn more about icing on the TB.
Icing in the TB is NOT related to Temperature alone. It IS related to ambient air temperature and dew point. More precisely the Temperature/Dew Point Spread or Difference.
If the Dew Point is within 4 degrees of the Temperature you can have ice in the TB or a Carb or any Venturi.
For Example:
1. If the Relative Humidity is high and the Dew point is 60 degrees and the OAT is 63 degrees ice WILL form in the TB, even with the temperature 31 degrees above freezing. The spread is less than 4 degrees!
2. If the Relative Humidity is low and the Dew point is 20 degrees and the OAT is 30 degrees, ice WILL NOT form in the TB, even though the temp is below freezing. The spread is greater than 4 degrees!
That's why Pilots of small aircraft always use "Carb Heat ON" during take off and landing and in clouds, even the Tropics, when flying while operating reciprocating engines with carbs.
I hope you read and heed what DJWorm has posted. He is a very knowledgeable guy and has explained in simple terms the dangers of doing the TB bypass. It is very important to understand about ice being able to form well above freezing. I have never seen anyone claiming gains from doing this mod. It would appear that the drawbacks far outweigh any possible gains.
Originally posted by WiseGuyZ Well guys Ive never had the icing problem here in mass and its been below freezing for about 12 days in a row. I guess its one of those things??????
Here's exactly what I(we) were trying to get across concerning this mod. Apparently there are some that don't read well, don't comprehend or just plain don't understand.
FREEZING TEMPS HAVE ABSOLUTELY NOTHING TO DO WITH ANY OF THIS.
It could be below freezing for the next 12 YEARS in a row and you might not have a problem. I just hope you aren't driving when just the right weather conditions exist, at some temperature well above freezing, and the throttle sticks for some 'unknown reason'.
As DJWorm previously explained...this is why pilots have "carb heat" on, 'even in the Tropics'.
You wil need a 5/16 barb (3/8 barb on some) - 1/4 barb - 1/8 NPT coupler - 1 ft 1/4 hose - 3 hose clamps. (if I remember correctly, some early Vettes have a 3/8 return line)
They are available at most hardware stores or at automotive parts retailers. (Auto Zone, PEP Boys, etc)
Here's a list of parts.
5/16 barb x 1/8 NPT (or 3/8 barb x 1/8 NPT)
1/4 barb x 1/8 NPT
Coupler 1/8 NPT x 1/8 NPT
1 ft. 1/4 fuel line (cut to desired length)
3 hose clamps (2 for 1/4 inch & 1 for 3/8 inch hose)
Thread sealer
1/4" cap
Just assemble the 3 fittings and insert the 5/16 barb into the return line from the TB to the rad, then run the 1/4 hose to the intake coolant port and cut to length. Tighten all the clamps and test for any leaks.
TIPS
Do not do this if the car is hot - let it cool down.
Remove rad cap
Have a 1/4" plastic cap to stop the coolant from leaking from the intake coolant line while you install the bypass.
Run the coolant line along the back side of the rad and then bring the 1/4" line to the intake at a 90* angle. (Don't just take the line over the pully)
Use a tie wrap to keep it in place
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