strange thump or popping sounds????????
#179060
12/30/08 08:25 PM
12/30/08 08:25 PM
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Posts: 6,816 Alton, IL
Dakota_Don
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New from the shop 410 SB stroker has a strange thumping or popping sounds, seems some of it is the fuel pump?? some of it sounds like its from the open headers but not sure.. Oil psi is very good at idle. it sounds like lower end, but not in one area i can not find anything banging or hitting under the truck, when i rev the engine it goes away. I would hate to think i would have to pull the engine again. Would open headers make a popping sound ( almost like a thumping) this noise sounds the same no matter where i am on the truck, top, bottom,either side.. should i run it with exhaust? any ideas? thanks Don
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Re: strange thump or popping sounds????????
[Re: goldmember]
#179063
12/31/08 11:42 AM
12/31/08 11:42 AM
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Dakota_Don
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the engine does rock at idle, so this is what im going to do, install a meg-shift exhaust, open plug gaps from 35 to 40, install an engine hold down strap, adjust the carb, hopefully i can get the engine to not rock as much at idle.
as far the engine or headers hitting anything i cant see where.. I crawled under the truck with it running and it still sounds the same.. plus my hearing sucks from working in the factory. Hopefully with some kinda exhaust it will stop or i will be able to track it down.. I guess im trying to compare it with a stock 318 rebuild, nice smooth and quiet.....
thanks for the replies..
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Re: strange thump or popping sounds????????
[Re: Dakota_Don]
#179064
12/31/08 11:55 AM
12/31/08 11:55 AM
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Posts: 1,047 Arizona
68CoronetRT
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Quote:
New from the shop 410 SB stroker has a strange thumping or popping sounds . . . Don
I would have not hesitate to get the "shop" involved immediately. The more time you play with it the less likely they'll stand by it. A friend of mine once paid for HP motor rebuild on his Mustang. Shop even installed it for him and called him to come and get it. He drove about a block and half and saw there was no oil pressure. Stopped, pulled the stick and you guessed it - empty. Turned around and drove back to the shop and they had the gall to say it was full when it left here. Get your mechanic on this ASAP.
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Re: strange thump or popping sounds????????
[Re: Lefty]
#179068
12/31/08 02:56 PM
12/31/08 02:56 PM
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Posts: 6,816 Alton, IL
Dakota_Don
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I called the machine shop. He assured me it was'nt the engine. There is'nt any torsion bars.. he said basically what was mentioned above.. The engine does shake a bit at idle espisially the trans tail-shaft area (stock Dak trans mount) but i did'nt see anything hitting.. I am going to remove the dust sheild, add some kinda exhaust,add a hold down strap and try to smooth-out the idle. I have the idle at about 1000 rpm now, maybe the plugs need a larger gap in them to. I will just let it sit till i get an exhaust,remove shield and add a hold down strap then go on to the next step.. BTW here are my specs 1972 360 built to a 410 stroker with 10.2 cr with .040ish quench XE274H 230/236@488/491 lift cam is installed straight up(it was degreed) I do not know if this cam will have a lope to it, which could lead to the shaking of the engine. ported J heads crosswinds intake (RPM airgap clone) 770 street avanger(out of box) FBO ignition (which failed between 3 to 4 K miles) Coil leaked oil and box went out, now im using accel super coil and mopar chrome box with FBO mech ONLY advance dist (which now needs and advance and recurve) long headers 904 low gear set and 2500 to 2800 stall 3.73 gears 96 dakota this is my fist engine with a cam in this size, will this cam have a lope to it? will that cause this shaking at idle and posible lead to the noise i am hearing and can'nt find.. thanks again
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Re: strange thump or popping sounds????????
[Re: Dakota_Don]
#179069
12/31/08 03:16 PM
12/31/08 03:16 PM
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MileHighDart
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Its your brain popping in and out of gear.... Mine does it all the time It doesn't get better with age
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Re: strange thump or popping sounds????????
[Re: MileHighDart]
#179071
12/31/08 03:52 PM
12/31/08 03:52 PM
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Joined: Jan 2003
Posts: 6,816 Alton, IL
Dakota_Don
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Quote:
Its your brain popping in and out of gear....
Mine does it all the time
It doesn't get better with age
you got that right..
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Re: strange thump or popping sounds????????
[Re: 1_WILD_RT]
#179072
12/31/08 04:01 PM
12/31/08 04:01 PM
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Dakota_Don
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Quote:
Once tuned that cam will idle pretty smooth, not stocker smooth but it sure shouldn't shake the engine enough to have it rattling off things..How much base timing have you got in it? \Get you exhaust hooked up then look it over...
thats kinda what i thought, my timming is set at approx 18 degrees at idle and a total of 35 degrees in at 3000-3300rpm.. but then this dist is setup for a different 360 combo w/same cam, heads intake and carb. Heck the carb may even need tweeked..
but before i go on, i need to cork the headers.. then move on..i beleive once i get it tuned right my thumping will go away.. i just hate the fact of adjusting this holley,ignition ????? not sure where to start..
anyway thanks for the seggestions.. grrrrrrr
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Re: strange thump or popping sounds????????
[Re: Dakota_Don]
#179073
12/31/08 05:02 PM
12/31/08 05:02 PM
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Joined: Aug 2006
Posts: 2,503 God's Country Maryland
GODSCOUNTRY340
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Before blaming the engine check your torque converter bolts. They may be hitting at idle, as you rev the engine the converter goes back into the trans and the knock stops.
I love the smell of Deer guts in the morning, it smells like... VICTORY!
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Re: strange thump or popping sounds????????
[Re: GODSCOUNTRY340]
#179074
01/01/09 03:03 PM
01/01/09 03:03 PM
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Anonymous
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i hear weird sounds in my 416 all the time. just gotta know if its a bad sound or just a normal sound.
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