12 replies to this topic

[brad hibbard]

602 Water Bypass Lines

 

We have commonly seen hot water lines connected to the ports below the carburetor on 602 engines. For racing applications this connection is completely WRONG.

 

The cavity in the 602 manifold below the carb is not attached to the cooling passages and should NOT be plumbed into the cooling system.

 

The intended use of this cavity is to heat the carburetor for winter time driving in a street application.

 

For racing application, we strongly recommend removing the pipe plugs to allow air to pass through this cavity.

 

NOTE: There are appropriate water bypass systems for 602 engines, however for this tech tip segment we wanted to emphasize what is NOT correct.

 

[ramey36]

That looks like a great place to plumb with ice water and a circulation pump...

[Fastbydesign]

That looks like a great place to plumb with ice water and a circulation pump...

Sounds like PSU engineering talk......

[ramey36]

Sounds like PSU engineering talk......

Haha. Yes. I didn't know that passage was like that. It would be easy to knock inlet air temps down quite a bit.

[dirtstudent2]

From my automotive teaching days from well over 40 years ago, the hot exhaust gas cross over is used to warm the manifold and air fuel mixture.  It allows for the already atomized fuel mixture to be heated prior to entering the combustion chamber.  It's needed because the air fuel mixture is too cold and condensed entering the engine before it gets up to temp and other things can then take over providing a proper fuel mixture.  

 

This is probably a dumb question but why would anyone want to condense properly mixed fuel and air by putting it through a cold area prior to entering the combustion chamber, doing the opposite of what it is designed to do?

[BUTTBEAK]

That's for your daily driver. DS2

 

Look up "air gap intake manifold theory".....use in racing engines.

[dirtstudent2]

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Edited by dirtstudent2, 20 August 2016 - 09:58 AM.

[LM RACING]

From my automotive teaching days from well over 40 years ago, the hot exhaust gas cross over is used to warm the manifold and air fuel mixture.  It allows for the already atomized fuel mixture to be heated prior to entering the combustion chamber.  It's needed because the air fuel mixture is too cold and condensed entering the engine before it gets up to temp and other things can then take over providing a proper fuel mixture.  
 
This is probably a dumb question but why would anyone want to condense properly mixed fuel and air by putting it through a cold area prior to entering the combustion chamber, doing the opposite of what it is designed to do?

The cooler you can keep the air and fuel mixture the better off you are in a racing situation. If you go back 40yrs as a mechanic you should remember the guys who would coil their fuel lines through a can or bucket and fill it with ice. When racing nobody is looking for the fuel efficiency. They want the hp.

Edited by LM RACING, 20 August 2016 - 10:36 AM.

[dirtstudent2]

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Edited by dirtstudent2, 21 August 2016 - 04:48 PM.

[dirtstudent2]

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Edited by dirtstudent2, 21 August 2016 - 04:48 PM.

[dirtstudent2]

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Edited by dirtstudent2, 21 August 2016 - 04:49 PM.

[dirtstudent2]

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Edited by dirtstudent2, 21 August 2016 - 04:49 PM.

[dirtstudent2]

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Edited by dirtstudent2, 21 August 2016 - 04:49 PM.