New 360 issues
#933562
02/20/11 10:15 PM
02/20/11 10:15 PM
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Joined: Jan 2004
Posts: 684
Colorado
swingers_rock
OP
super gas
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OP
super gas
Joined: Jan 2004
Posts: 684
Colorado
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Hey guys! My magnum 360 that I just installed is having issues let me explain what is going on. The motor has 190 miles on it(breaking it in). Today I was out in the country breaking it in and decided to let it rip, so I got on it from a start and went all the way through the gears WOT. As soon as I let off and got back on it for cruising speeds(50mph) it was running really rough and vibrating. Took it to the house and it was barely even running. I checked for spark issues and found that it was very weak. I took the cap off the distributor and found the shaft have way way to much play in it so I replaced it with a new one and still..started it up and it barely runs. Has 60psi oil press when cruising and about 35psi at low idle in gear. No weird noises or anything. Oil is nice and clean. I checked all the spark plugs and they arent broken or anything. P.S. Heres the motor build: magnum 360, ported rhs heads, forged pistons(9.4 compression), eddy carb, airgap intake, headers, 0.525 lift roller cam. Thanks for all of the help guys!!! 
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Re: New 360 issues
[Re: swingers_rock]
#933565
02/21/11 03:24 AM
02/21/11 03:24 AM
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Joined: Feb 2005
Posts: 5,221
Branson, Mo.
joedust451
super gas
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super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
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Quote:
Hey guys! My magnum 360 that I just installed is having issues let me explain what is going on. The motor has 190 miles on it(breaking it in). Today I was out in the country breaking it in and decided to let it rip, so I got on it from a start and went all the way through the gears WOT. As soon as I let off and got back on it for cruising speeds(50mph) it was running really rough and vibrating. Took it to the house and it was barely even running. I checked for spark issues and found that it was very weak. I took the cap off the distributor and found the shaft have way way to much play in it so I replaced it with a new one and still..started it up and it barely runs. Has 60psi oil press when cruising and about 35psi at low idle in gear. No weird noises or anything. Oil is nice and clean. I checked all the spark plugs and they arent broken or anything.
P.S. Heres the motor build: magnum 360, ported rhs heads, forged pistons(9.4 compression), eddy carb, airgap intake, headers, 0.525 lift roller cam.
Thanks for all of the help guys!!!
Sounds like either a fuel problem, or possibly a bad vacuum leak, make sure it didn't pop an intake gasket or a hose isn't disconnected, also make sure the carb is getting fuel & didn't suck up crap in the idle curcuit.
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Re: New 360 issues
[Re: GO_Fish]
#933568
02/21/11 07:27 PM
02/21/11 07:27 PM
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Joined: Jan 2003
Posts: 4,518
Indiana
MonGoo$e
master
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master
Joined: Jan 2003
Posts: 4,518
Indiana
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I ask about Dist. because I bought a new Mopar piece and it worked for a few weeks, after some "sprints" It seemed inconsistant...sometimes would not start, sometimes would, then, in it's final gasp at age..5 months or so old, it wouldn't fire and I had to get towed home, very weak spark.
I stuck in the original 38 year old piece and it fire right up, strong spark, strong idle.
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Re: New 360 issues
[Re: MonGoo$e]
#933569
02/21/11 07:54 PM
02/21/11 07:54 PM
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Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
Too Many Posts
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Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
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Quote:
I ask about Dist. because I bought a new Mopar piece and it worked for a few weeks, after some "sprints" It seemed inconsistant...sometimes would not start, sometimes would, then, in it's final gasp at age..5 months or so old, it wouldn't fire and I had to get towed home, very weak spark.
I stuck in the original 38 year old piece and it fire right up, strong spark, strong idle.
I have bought 2 brand new MP dist and both of the pickups inside were bad, I replaced them with used pickups and all is good. I also experienced that with a 3rd MP dist that was a friends. When you ohm them they checked out different than a stock pickup, beware.
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Re: New 360 issues
[Re: urdustd]
#933571
02/22/11 11:08 AM
02/22/11 11:08 AM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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what rockers are you using? is there a fair amount of valve train clatter?
on my roller cam/mag headed 318 I built, I had an issue kinda like what you were describing. ended up being the 5/16" bolts holding some of the pedestal rocker arms worked their way loose. I ended up bending 3 pushrods with that...
torque spec on them is 21ft-lbs (when I installed them I used my inch lb torque wrench to 250). when I fixed it, I used my long handled ratchet to "tight" and havent had a problem since.
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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