I have a 383 stroker that was running fine then I noticed the 2 inner pipes on header were glowing red. It this cause by timing or tuning issues? Any info will be helpful. Thanks
No it's not a case of a enlarge ego quoting myself.The question I posed was never answered.In theory a mismatched port would end up running hotter.So I asked if he ported the heads himself.Also I have seen brand new aluminum heads right out of the box have crap in them needing to be cleaned out like in the exhaust port or around the exhaust valve cooling.I'm thinking because it is two cylinders right next to each other there is a cooling restriction there making the exhaust valves hot.
And as I think about this more,a simpler answer would be some sort of intake gasket issue.
Call the state and community Collages if the auto department has a dino they dino for free ! Jester
If you have a miss fire down a pipe its a rich mixture (Because it didn't fire in the cylinder)and will be audible when firing in the pipe a lean cylinder will fire hotter and a very hot blue flame will be right at the exhaust port and as rpm increases that hot spot moves further down the pipe!
heat in the exhaust is actually good, and creates better scavenging in the pipes, wrapped headers hold heat and create horse power! A lean burn in a cylinder creates excessive heat and causes piston and cylinder damage! My headers are cherry at night or dusk but aren't that noticed in the day or under lights and there is no problems with my engines! A Higher octane fuel can help! Are you running pump gas?
The cylinder heat, if too extreme running lean will usually cause an early ignition from hot spots like a hot exhaust valve and you havn't mentioned that! From what I read your only worry is 2 pipes glowing more then the others?
The fuel filter was clean I also took distributor cap off and cleaned up under there. I checked the Pcv line one goes to the intake and one goes into the throttle body.
Sucking too much air thru the vac connection on the intake. That connection probably references those two cylinders. Try pinching off that vacuum line and see what happens.
Yea I checked the vacume lines there's no leaks I'm going to get a lean/rich gauge today and try it. I'm starting to think its retarded timing or something in the computer program and how it's tuned. Thanks for all y'all's comments..
And what 2 header pipes are getting hot! and how far away from the heads and what brand headers do you run?
I read the thread and may have missed it but I think your intake is like a tunnel ram with no fuel flow just ram air and the injectors are direct port injectors at the heads?
Ive run injection and carbed engines and had all pipes running red and somtimes only one or 2 ! On my Dino tests all pipes are usually running red but if I change to different brand headers on the same engine they sometimes don't glow, cylinders during the ignition side of the stroke run at about 1600 degrees and at the head port some header pipes glow! A dirty or lean injector squirt will cause 1 of your pipes to glow but a timing problem would effect all your cylinders not just 2 (sent this early bear with me Ill try to type fast enough to finnish LOL) At the track and on the dino I have had to stagger jet carbs because of a normal 1 or 2 cylinders having a lean condition depending on intake flow from port to port or a small difference in cylinder efficiency, and with Hilborn or other independent port injection had to have different setting from cylinder to cylinder for very high rpm either on the injector or tuning with the stack length! I don't know what rpm your pipes are glowing at or if it subsides when running at a different rpm? If you are running lean you need to correct it but it could be a normal condition caused by temp and flow and differences in header pipe configuration and the gauge of the pipe.
Is it one inside pipe on each side or 2 inside pipes on one side?
The reason I ask is because of the way the intake ports are
separated after leaving the plenum box, They are paired and separated with a divider front and rear side to side! the only thing they have in common is the plenum box and the injector fuel rail! If its 2 pipes on one side or one on each side of the engine the fuel rails could have had a little debree or something that is blocking the 2 injectors fuel inputs ( may be something during shipping that you missed during your cleaning of the new parts before you assembled them or a little bit of metal or something that was dislodged from the lines and fitting during assembly and has worked its way to the injectors!
Ive seen clear vacuum packaging missed during initial clean up block an injector off completely causing a cylinder not to fire at all !
Not saying that's your problem but its a thing to think about! If a shop didn't clean and inspect and blow every thing dry, you could have a dead **** roach to a bunch of head lice in there LOL! swap your injectors with 2 good running cylinders and see if those 2 pipes are still glowing?
It's just the driver side I checked intake bolts and one side was loose and the other side was kinda loose I tighten them up and then did compression test all of them have good compression. I'm about to see if the intake being loose was the problem I'm waiting on battery to charge lol if it ain't one thing it's another
Sounds like intake valves too tight or not seating! Set your lifters at 0 lash if hydr. for a running test and if it cures the back fire reset them to specs when hot! Check em hot if solid!
Week springs can cause the same thing! Or a timing issue! You need to take care of these issues and then worry about the exhaust
Jester
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