Author Topic: Boiling fuel and intake swap  (Read 427 times)

Offline rattlesnake

  • Rattlesnake
  • Jr. Member
  • **
  • Posts: 431
Boiling fuel and intake swap
« on: June 10, 2017 - 11:55:16 pm »
Finally figured out the cuda is boiling the fuel after long drives on hot days. I currently am running a Wiend team G aluminum manifold with a Holley 850 carb. I was told by RPM racing in Indianapolis the motor is heat sinking after shut-down causing fuel to boil in the carb, which causes hard re-start. They said I need a special type of spacer between the carb and intake which does not transfer heat from the intake to the carb. The problem is with the mid rise intake I don't have room for a spacer so I need to change the intake to free up some space. Does anyone have any suggestions for a low rise single plane intake for a moderately modified 440? It has 10:1 compression, comp cams thumper cam hydraulic lifters, 2" headers, 3500 stall. If any more info is needed I can give it. Suggestions will be appreciated.
keep honking I'm reloading




Offline cudabob496

  • Sr. Resident
  • ******
  • Posts: 6878
Re: Boiling fuel and intake swap
« Reply #1 on: June 11, 2017 - 12:45:29 am »
I had 3/8 inch milled off my M1 single plane to fit spacer.
Insulate your fuel lines. Route them away from heat.

Make a heat shield for your carb.
72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.
Up to 4000 RPM, Warp Speed, Up to 5000, Rediculous Speed, Up to 6000 RPM, Ludicrous Speed!

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

Offline cudabob496

  • Sr. Resident
  • ******
  • Posts: 6878
72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.
Up to 4000 RPM, Warp Speed, Up to 5000, Rediculous Speed, Up to 6000 RPM, Ludicrous Speed!

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"


Offline Racer57

  • Sr. Member
  • ****
  • Posts: 1488
Re: Boiling fuel and intake swap
« Reply #3 on: June 11, 2017 - 09:32:13 am »
I taped 2 layers of Reflextic together and placed it under my 383s intake on top of the valley pan and it helped.

Offline dodj

  • Sr. Resident
  • ******
  • Posts: 6177
Re: Boiling fuel and intake swap
« Reply #4 on: June 11, 2017 - 09:38:17 am »
I don't know if it is a shorter manifold than the Weiand, but I like my Holley Street Dominator single plane. I bought it after several recommendations from forum members. Give it a look. :2cents:
Scott
1973 Challenger  440 4 spd 
2007.5 3500 6.7 Cummins Diesel, Anarchy tuned.
Good friends don't let friends do stupid things. ........alone.


Offline cudabob496

  • Sr. Resident
  • ******
  • Posts: 6878
Re: Boiling fuel and intake swap
« Reply #6 on: June 11, 2017 - 11:51:50 pm »
vent engine compartment to keep it cooler. Place sheet metal shields
over exhaust manifolds. Coatings on headers help a lot. Coat inside and outside
of header.
72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.
Up to 4000 RPM, Warp Speed, Up to 5000, Rediculous Speed, Up to 6000 RPM, Ludicrous Speed!

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

Offline rattlesnake

  • Rattlesnake
  • Jr. Member
  • **
  • Posts: 431
Re: Boiling fuel and intake swap
« Reply #7 on: July 07, 2017 - 03:58:12 pm »
Update for you fellas that are interested. I opted to change my high rise team G intake to a torker ll to gain hood clearance and bought a carb cool kit from quick fuel, which consisted of a heat shield and a non-heat transferring spacer. I switched the thermostat from a 180 to a 160. The carb cool kit did the trick. The damn car still wants to run 180 degrees but no more boiling fuel for now. Just wish I could keep the engine a little cooler.
keep honking I'm reloading

Offline burdar

  • Sr. Resident
  • ******
  • Posts: 5928
Re: Boiling fuel and intake swap
« Reply #8 on: July 07, 2017 - 04:24:41 pm »
180 degrees is the minimum safe temp for an engine IMO.  Any cooler and you accelerate the wear.  A thermostat does NOT control the high side of the system.  The thermostat only controls the minimum temp the engine will run at.  If an engine wants to run at 200 degrees, it's going to run at 200 degrees with a 180 or a 160.  The thermostat has no effect on maximum temp.

The factory thermostat was a 195 I believe.

Offline cudabob496

  • Sr. Resident
  • ******
  • Posts: 6878
Re: Boiling fuel and intake swap
« Reply #9 on: July 07, 2017 - 08:48:15 pm »
ya, go back to a 180 thermo, or potential to damage engine, especially when its cool or cold outside
72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.
Up to 4000 RPM, Warp Speed, Up to 5000, Rediculous Speed, Up to 6000 RPM, Ludicrous Speed!

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

Offline cudabob496

  • Sr. Resident
  • ******
  • Posts: 6878
Re: Boiling fuel and intake swap
« Reply #10 on: July 07, 2017 - 08:49:59 pm »
if you have aluminum heads, you want to be up to 190 to 200, to make max power,
due to aluminum removing too much heat from combustion chamber.
72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.
Up to 4000 RPM, Warp Speed, Up to 5000, Rediculous Speed, Up to 6000 RPM, Ludicrous Speed!

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

Offline 734406pk

  • Andy
  • Sr. Member
  • ****
  • Posts: 1680
Re: Boiling fuel and intake swap
« Reply #11 on: July 07, 2017 - 09:07:16 pm »
Update for you fellas that are interested. I opted to change my high rise team G intake to a torker ll to gain hood clearance and bought a carb cool kit from quick fuel, which consisted of a heat shield and a non-heat transferring spacer. I switched the thermostat from a 180 to a 160. The carb cool kit did the trick. The damn car still wants to run 180 degrees but no more boiling fuel for now. Just wish I could keep the engine a little cooler.


Glad to hear the heat insulating spacer has worked in solving the fuel boil issue! 160 deg may not be possible due to ambient temp etc. I would stick with 180 degree t-stat IMO. :2thumbs:
1973 Challenger 440 6 pack auto 3.91 rear
2012 Dodge Ram 3500 dually 6.7 Cummins Fleece EFI Live
1973 Challenger 318 2bbl auto 2.73 rear 22.5 mpg RIP
1970 Challenger TA 340 4bbl auto-Sold and sad
1999 Dodge Ram 3500 dually 5.9 Cummins Fleece tuned VGT-sold
1995 Kawasaki ZX1100E & still alive