08-23-2022, 08:12 PM | #1 |
Drives: Chevy Camaro Join Date: Apr 2022
Location: louisiana
Posts: 38
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V8 thumping under hood
Hello all, I mostly feel this with Dodge Challenger 392s but in general do bigger engine cause almost like a heavy idle surge? The best way to describe is if I start my vehicle and let it idle it’s noticeable thump under the under like the motor is moving. I felt this in many used performance vehicles but I just want to know is this the norm of owning a performance V8
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08-23-2022, 08:48 PM | #2 |
PKG4U
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I would say when the engine is warming up.. it’s normal
But I’m no mechanic so most would say upload a clip of what you exactly mean.
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08-23-2022, 08:59 PM | #3 |
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Well the term “ it has a big thumping V8 under the hood” certainly applies to our cars. A humming sewing machine Honda 4 cylinder it is not.
That said when at idle the engine should not be noticeably rocking around. If so then you may have a misfire. A under hood video would help.
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08-23-2022, 10:10 PM | #4 |
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A little cam-lope, but put the best fuel you can in it, 93 octane. Barring that, 91 and octane booster, not the snake-oil stuff that comes in tiny little bottles. Royal Purple unleaded works for me. There is a big difference between octane "points" and "numbers" BTW.
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08-24-2022, 12:15 AM | #5 | |
Drives: 2020 Chevrolet Camaro Coupe 2SS 1LE Join Date: Feb 2020
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Quote:
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08-24-2022, 07:59 AM | #6 |
Dumb Ass Deluxe
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It's safe in low quantities. I think VP say no more the 2.2 oz in 10 gallons for pollution controlled motors.
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08-24-2022, 09:22 AM | #7 |
Drives: 2021 LT1 6spd Join Date: Nov 2020
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My impression on the MMT issue was it was all about emissions / cats, not particularly going to hurt your engine.
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08-24-2022, 01:06 PM | #8 | |
Drives: 2017 2SS, 50th pkg, M6, MRC, NPP Join Date: Jan 2016
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Quote:
In addition to the noise/thump, what are you seeing on your tachometer? Last edited by ctrlz; 08-25-2022 at 11:30 AM. |
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08-25-2022, 09:33 PM | #9 |
Drives: 2022 1SS Team Joe and Becky Join Date: Apr 2021
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Motor vibrating the car? Yes. Motor moving around and thumping because its bouncing on the mounts? No.
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08-25-2022, 10:41 PM | #10 | |
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Quote:
I'm fairly sure that's what I'm using, without MMT. I am careful to not use the MMT or leaded.
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08-26-2022, 10:28 AM | #11 | |
Drives: 2017 2SS, 50th pkg, M6, MRC, NPP Join Date: Jan 2016
Location: Ocean City, NJ
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Quote:
OP is in Louisiana and posted this in August. I really only sense any bit of erratic idle during winter cold starts. Otherwise, this thing kicks off pretty smooth and goes to high idle then drops rpms over a minute or two. |
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