Need help with noise - Ford Powerstroke Diesel Forum
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post #1 of 18 Old 05-07-2011, 01:52 PM Thread Starter
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Need help with noise

i just put a smf and a 3.5" downpipe in at the same time and when im in 1st or 2cnd gear idling or at lower rpm's i can hear a grinding or rubbing type noise. ive pushed the firewall back with a portapower, i have about an 1" of clearnce. has anyone expeirenced this before? do i need more dp clearnce?
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post #2 of 18 Old 05-07-2011, 02:57 PM
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yes, its for sure your exhaust, you may also look where the down pipe goes by your tranny lines and make sure its not rubbing

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post #3 of 18 Old 05-07-2011, 03:43 PM Thread Starter
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The only place that it was close to anything other than the firewall was the trans crossmember and I checked that and it was not the source. How much clearance do i need for this dp?
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post #4 of 18 Old 05-07-2011, 03:51 PM
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If u r sure the nose is from Ur exhaust. U can always rap it in heat rap. If it is clanking on things that will or proved a barrier. exhaust heat rap.
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post #5 of 18 Old 05-07-2011, 04:59 PM Thread Starter
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I don't know if its the dp for sure yet. I've heard about trucks having gear noise after a smf conversion, but I don't think this noise is that because of when it does it? What amount of clearance does an average dp take to not rub atall? In inches
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post #6 of 18 Old 05-07-2011, 05:58 PM
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Could still be the gear noise introduced by the single mass. We have one in the RCLB, and come to think of it, you don't hear it so much at higher speeds, probably just because its masked by the increased road noise.
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post #7 of 18 Old 05-07-2011, 06:13 PM Thread Starter
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madpogue Is that gear noise none stop at lower speeds ?
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post #8 of 18 Old 05-07-2011, 06:30 PM
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No, seems like you hear it right on launch.
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post #9 of 18 Old 05-07-2011, 07:09 PM
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i have a solid flywheel and it is noisy. espescially at low rpm's and when the motor is bogging. it goes away when she spools up a little
if it was the downpipe, u would hear it all the time.

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post #10 of 18 Old 05-08-2011, 04:27 AM Thread Starter
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madpogue troykimber can you describe the gear noise that you have ?
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