Results 1 to 7 of 7
Thread: One Glowing Header Tube????
-
10-09-2008 #1
Registered User
- Join Date
- Dec 2006
- Location
- Phoenix,Arizona
- Posts
- 1,013
One Glowing Header Tube????
Hey guys,
Here is the situation; I just built a brand new engine (sbc 355) for the Nova. Went to break it in and after about 5 minutes of running it at around 2500rpm to break in the cam i notice that the header tube on cylinder #5 is glowing red hot. None of the other cylinders are glowing. What could cause this on only one cylinder? Also i noticed some white residue inside the tube when i removed the header. Any help is greatly appreciated.
Thanks,
Brian
Brian
-1972 Nova-1968 Camaro
-1990 Iroc Camaro
-
10-09-2008 #2
Registered User
- Join Date
- Jul 2006
- Location
- Tallahassee
- Posts
- 295
Maybe the exhaust valve isn't fully seating and is allowing the combustion into the #5 primary tube?
10-09-2008 #3
Registered User
- Join Date
- Sep 2002
- Location
- San Jose, CA
- Posts
- 1,793
maybe you lost a cam lobe during break-in
I would pull valvecovers and crank the engine around once by hand to see if the #5 valves are opening and closing properly1971 Camaro, 383 stroker ~500HP,M21 Trans with lightened flywheel. All Sorts of Auto-x Goodness in the Suspension. 12" Brakes ->SOLD
But ask me about my 2004 STi Auto-x car...
Just call me Brett
10-09-2008 #4
Registered User
- Join Date
- Dec 2006
- Location
- Phoenix,Arizona
- Posts
- 1,013
yeah i thought of that too, i checked the rockers and they seem to be opening an closing properly. I just dont get why that one cylinder is doing it. Im gonna pull the plug tomarrow and see what it looks like.
Brian
-1972 Nova-1968 Camaro
-1990 Iroc Camaro
10-10-2008 #5
Registered User
- Join Date
- Nov 2005
- Location
- Farmington Hills, MI
- Posts
- 1,038
Is it possible that you have your PCV hose to the port on the intake that is specific to 1 cylinder?
I did this and it causes a lean condition in one cylinder, hence the glowing tube.
PCV should be connected to a vacuum port that feeds all cylinders.
JeffJEFF SHORTT
-IDEAL STEEL
10-10-2008 #6
Registered User
- Join Date
- Oct 2007
- Location
- ridgefield ct
- Posts
- 876
EFI or carb?
work in progress--for the next 10 years.
1987 monte carlo ss 383ci, 9.7:1, xe274 cam, vortec heads, 200r4, 3.73 posi.
10-10-2008 #7
Registered User
- Join Date
- Dec 2006
- Location
- Phoenix,Arizona
- Posts
- 1,013
its got an Edelbrock 750 on it. 10;1 compression. Aluminum heads, cam is 488/510 lift, 234/244 duration at .050", Hooker 1 5/8" headers, edelbrock performer rpm intake.
Brian
-1972 Nova-1968 Camaro
-1990 Iroc Camaro
Reply With Quote
