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Intake Manifold Exhaust Crossover #1169039 01/30/12 10:55 PM 01/30/12 10:55 PM
Joined: Jun 2008 Posts: 251 Lithonia, Ga 3 36PLYM OP enthusiast
36PLYM OP enthusiast 3 Joined: Jun 2008 Posts: 251 Lithonia, Ga	What is the purpose for this? Replacing my intake with an air gap that has no crossover. Any adverse effects? Thanks! 36 Plymouth Coupe 318 w/360 heads 518 trans 8 3/4 rear Ga. Tech BCE'78

Re: Intake Manifold Exhaust Crossover [Re: 36PLYM] #1169040 01/30/12 11:22 PM 01/30/12 11:22 PM
Joined: Aug 2005 Posts: 11,543 chicagoland,usa B buildanother I Live Here
buildanother I Live Here B Joined: Aug 2005 Posts: 11,543 chicagoland,usa	Better driveability especially during warmup in cool climates. They would get plugged up then cause choke opening issues, when the heat riser failed to push the exhaust through intake man.

Re: Intake Manifold Exhaust Crossover [Re: buildanother] #1169041 01/31/12 09:06 AM 01/31/12 09:06 AM
Joined: Sep 2006 Posts: 277 Palmyra, NY 6 63stabamatic enthusiast
63stabamatic enthusiast 6 Joined: Sep 2006 Posts: 277 Palmyra, NY	Quote: Better driveability especially during warmup in cool climates. They would get plugged up then cause choke opening issues, when the heat riser failed to push the exhaust through intake man. This carbon blocked intake indeed happens, saw it happen twice on my cousins 70 340 swinger. My 69GTX had a blocked off intake runner when I bought it. I opened it back up to make the stock automatic choke work correctly. It gets a little warmer but choke works great now.

Re: Intake Manifold Exhaust Crossover [Re: buildanother] #1169042 01/31/12 09:26 AM 01/31/12 09:26 AM
Joined: Nov 2010 Posts: 582 PA B BTTG mopar
BTTG mopar B Joined: Nov 2010 Posts: 582 PA	If the intake crossover is open (not blocked in any way), but the heat riser is frozen open (as is common) does enough heat passively pass through the intake to allow the thermostatic choke to operate near normal?

Re: Intake Manifold Exhaust Crossover [Re: BTTG] #1169043 01/31/12 01:23 PM 01/31/12 01:23 PM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	You guys make me feel so old! NO WAY is the heat crossover primarily there to heat the automatic choke. There were methods to heat the carb area way before the first automatic choke. It was done to promote fuel vaporization and to prevent carb freezeup. Look at a six cylinder from the 30s. The intake and exhaust come together below the carb. High performance is a different story, the cooler the intake manifold the more power. So heat risers are blocked off and manifolds have the valve or whatever you call it removed. I ran a chevy for years in North Dakota with the exhaust damper removed and it worked winter or summer, so some heating must take place without the damper. I used a carb with electric choke and later with no choke at all. The LA crossover tends to carbon up, that is true. It probably makes a stock automatic choke come off later, but I can't say. R.

Re: Intake Manifold Exhaust Crossover [Re: BTTG] #1169044 01/31/12 01:44 PM 01/31/12 01:44 PM
Joined: Jan 2003 Posts: 74,970 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 74,970 U.S.S.A.	Quote: If the intake crossover is open (not blocked in any way), but the heat riser is frozen open (as is common) does enough heat passively pass through the intake to allow the thermostatic choke to operate near normal? somewhat normal , yes.

Re: Intake Manifold Exhaust Crossover [Re: JohnRR] #1169045 01/31/12 02:08 PM 01/31/12 02:08 PM
Joined: Nov 2010 Posts: 582 PA B BTTG mopar
BTTG mopar B Joined: Nov 2010 Posts: 582 PA	I keep coming back to this. my 440 engine has been rebuilt and is ready to go back in my car soon. i have an NOS heat riser valve. i put it on the manifold minus the internal 'flapper'... fear burning the paint off the intake. don't know if this risk is real or not. people certainly talk about it happening, but whether it really happens or not i am unsure. I used Badalsons PPG orange paint on it. so i have been waffling as to whether to put the actual flapper in or not... or just leave everything else hooked up so it looks right, but won't force all that hot air up through the intake when cold... running the original carter AVS

Re: Intake Manifold Exhaust Crossover [Re: dogdays] #1169046 01/31/12 02:19 PM 01/31/12 02:19 PM
Joined: Dec 2006 Posts: 3,533 Indiana F Fury Fan master
Fury Fan master F Joined: Dec 2006 Posts: 3,533 Indiana	Quote: You guys make me feel so old! NO WAY is the heat crossover primarily there to heat the automatic choke. There were methods to heat the carb area way before the first automatic choke. It was done to promote fuel vaporization and to prevent carb freezeup.

Re: Intake Manifold Exhaust Crossover [Re: Fury Fan] #1169047 01/31/12 03:16 PM 01/31/12 03:16 PM
Joined: Jul 2008 Posts: 30,424 Florida STAYcation dOc ! The village idiot's idiot
dOc ! The village idiot's idiot Joined: Jul 2008 Posts: 30,424 Florida STAYcation	Quote: Quote: You guys make me feel so old! NO WAY is the heat crossover primarily there to heat the automatic choke. There were methods to heat the carb area way before the first automatic choke. It was done to promote fuel vaporization and to prevent carb freezeup. Part right, part uNcorrect .... The auto-choke(well type) IS controlled by crossover heating. PRIMARY use is for bester fuel vaporization. Carb freezeUP ? Maybe when Cuba starts selling a bunch of ...

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