Spark plugs/mind boggling events
#1
Spark plugs/mind boggling events
91 D150 360 mag swap, .020 overbore, 11.1:1 CR, Monster Magnum heads, .501/.524 lift cam .258/.268 duration, 112LSA, Edelbrock duel plane intake, Edelbrock 650 carb. 160* high flow T-stat. Maybe 1,000 miles on build.
i decided to pull the spark plugs, they are all a reddish brown color, but clean besides that......... It was skipping and not running very well, I flooded it the other morning, and it sat. The idle surges when holding it at a steady rpm. I pulled the spark plugs because it acts like a blown head gasket, radiator hoses rock hard, developed new leaks tightened one hose, but it's leaking past the squeeze clamps on the heater core, blowing oil out of the breather filters on the valve covers, and blowing it out of the dip stick tube. No oil in coolant, no coolant in oil, not burning oil, not burning coolant. Plugs are, reddish brown, with some black soot around the outer edge from being flooded if I had to guess. Stock oil pump, I'm running shell rotella 15w40 for the added zinc. Switching to synthetic next oil change. Plugs have been in it since the build, and may well be fouled. Stock plug, plain ole copper champion, .035 gap, nice blue spark. Napa lifetime wires, brass cap and rotor, mds blaster 2 coil (red) oil filled, Mopar electronic ignition, orange box. Running dual resistors, I'm thinking of bypassing them? And doing a full tune up, plus a carb rebuild. It sat for a few months with ethanol gas. I've been running sea foam. Valve cover gaskets are starting to leak now also. Could the oil ground out the plug and make it skip??
i decided to pull the spark plugs, they are all a reddish brown color, but clean besides that......... It was skipping and not running very well, I flooded it the other morning, and it sat. The idle surges when holding it at a steady rpm. I pulled the spark plugs because it acts like a blown head gasket, radiator hoses rock hard, developed new leaks tightened one hose, but it's leaking past the squeeze clamps on the heater core, blowing oil out of the breather filters on the valve covers, and blowing it out of the dip stick tube. No oil in coolant, no coolant in oil, not burning oil, not burning coolant. Plugs are, reddish brown, with some black soot around the outer edge from being flooded if I had to guess. Stock oil pump, I'm running shell rotella 15w40 for the added zinc. Switching to synthetic next oil change. Plugs have been in it since the build, and may well be fouled. Stock plug, plain ole copper champion, .035 gap, nice blue spark. Napa lifetime wires, brass cap and rotor, mds blaster 2 coil (red) oil filled, Mopar electronic ignition, orange box. Running dual resistors, I'm thinking of bypassing them? And doing a full tune up, plus a carb rebuild. It sat for a few months with ethanol gas. I've been running sea foam. Valve cover gaskets are starting to leak now also. Could the oil ground out the plug and make it skip??
#2
how bad was it flooded? gas in the oil flooded? 11.1:1 seems a bit high of a compression ratio unless i am missing something. i would assume you would almost have to be almost running race fuel at which point you probably do want to not let the fuel sit for much more than 30 days. did you check the PCV valve?
#3
how bad was it flooded? gas in the oil flooded? 11.1:1 seems a bit high of a compression ratio unless i am missing something. i would assume you would almost have to be almost running race fuel at which point you probably do want to not let the fuel sit for much more than 30 days. did you check the PCV valve?
Oil don't smell like gas, but I'm still gonna change it, prolly wouldn't hurt to go through the carb. AZ has an Edelbrock rebuild kit in stock for my carb. Edelbrock brand.
Last edited by rebeltaz83; 12-28-2019 at 07:24 PM.
#4
#5
you should probably install a pcv valve. it may be part of why there is so much pressure in the crankcase which is causing the valve cover leaks. there is a reason almost every engine out there still has one. you should be able to see moisture in the distributor cap if it is there.
#6
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rebeltaz83 (12-29-2019)
#7
I can put one in, ain't no big deal. Bottom of the air cleaner has the knock out for the hose. I'll put in an oil catch can, help keep the oil film out of the intake.
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#8
blowing oil out of the breather filters on the valve covers, and blowing it out of the dip stick tube.
#9
#10
Did you happen to do a compression test any time since it was rebuilt? This seems like it could be cause by blow by. Also do the valve covers have the plate under the breather holes? If not the oil just gets thrown up into the breather. Had this problem with different M/T (Mickey Thompson) valve covers. And i would ditch the champion plugs and use Autolites.
Yep, my mind was on other things. It's got the nipple in the very front of the carb. I got it plugged off. I got everything I need, unless the hole in the valve cover is to big for my pcv valve...... But I kept the stock magnum valve covers, so I can put those on if I have to, with a new set of gaskets easy peasy. I got the $20 Edelbrock special covers lol, cheap. I'll put the aluminum ones back on.