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  #13  
Old 02-05-2014, 03:53 PM
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It is normal and has to do with thermal expansion of the pistons within the cylinders. The best thing to do is let it warm up to operating temperature before driving it.

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  #14  
Old 02-05-2014, 03:56 PM
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Re: Hemi sounds like diesel when cold

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Originally Posted by Bikemanx2 View Post
The best thing to do is let it warm up to operating temperature before driving it.
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Old 02-06-2014, 11:39 AM
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Re: Hemi sounds like diesel when cold

The Hemi pistons are a short skirt, free-floating type and, as with most high performance engines, expand to ideal clearances when at operating temps to provide performance and efficiency. The colder it is, the more clearance there is so you hear "piston slap". There is nothing bad happening, just don't hammer on it when the engine is cold and drive mildly until you're at operating temp -- good procedure for any engine IMHO.

The Hemi rods and pistons are highly refined and lightweight which may also add to the relative cacophony on startup. Personally, I enjoy the mechanical noises the mild monster makes.
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Old 02-06-2014, 08:55 PM
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Re: Hemi sounds like diesel when cold

Can someone please describe the noise?
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Old 02-06-2014, 09:40 PM
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Good synthetic oil that meets specs will help make hemi quiet.
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Old 02-07-2014, 05:52 AM
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Re: Hemi sounds like diesel when cold

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Originally Posted by BManz View Post
The Hemi pistons are a short skirt, free-floating type and, as with most high performance engines, expand to ideal clearances when at operating temps to provide performance and efficiency. The colder it is, the more clearance there is so you hear "piston slap". There is nothing bad happening, just don't hammer on it when the engine is cold and drive mildly until you're at operating temp -- good procedure for any engine IMHO.

The Hemi rods and pistons are highly refined and lightweight which may also add to the relative cacophony on startup. Personally, I enjoy the mechanical noises the mild monster makes.
Ding, ding, ding, ya got a winner right here. This is normal and you can drive off just the same as any other car without an overly long warm up. Just take it easy till its up to temp which you should be doing anyways.

You guys would have a heart attack if you heard an E9X M3 at cold startup. lol
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Old 02-07-2014, 06:58 PM
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Re: Hemi sounds like diesel when cold

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Originally Posted by crabman View Post
Ding, ding, ding, ya got a winner right here. This is normal and you can drive off just the same as any other car without an overly long warm up. Just take it easy till its up to temp which you should be doing anyways.

You guys would have a heart attack if you heard an E9X M3 at cold startup. lol
I had a 2010 E92 M3 and mine was pretty quiet on a cold start in the garage.
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Old 02-07-2014, 08:55 PM
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Re: Hemi sounds like diesel when cold

I've been active on those forums for years, attended the meet ups, etc. You would be the first person I ever heard call out an E9X as quiet at startup. Mine will easily drown out my actual diesel GC which will itself drown out the hemi at startup. It isn't even close.
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Old 02-08-2014, 07:19 PM
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Re: Hemi sounds like diesel when cold

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Originally Posted by crabman View Post
I've been active on those forums for years, attended the meet ups, etc. You would be the first person I ever heard call out an E9X as quiet at startup. Mine will easily drown out my actual diesel GC which will itself drown out the hemi at startup. It isn't even close.
It's been over 2 years since I got rid of the M3 so I probably just got so used to how quiet the hemi is that I forgot the cold startup sounds of the M3. Do kind of miss that 8200 rpm redline. That thing was a screamer. But those days are gone on production vehicles.
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Old 05-28-2014, 12:50 PM
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Re: Hemi sounds like diesel when cold

I have been listening and its only after the first start of the day and only after putting it in gear. It only lasts a couple minutes until the engine warms a little bit.
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