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Old 09-19-2008, 11:20 PM   #1
Chi_San
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Default Engine sound difference - Built motors vs stock

I was just wondering if a built, stroked, higher displacement H4 sounds like compared to a stock H4. Specifically, sound clips of a 2.65, 2.7, and 2.8 liter STi vs a stock 2.5. Prefer the same exhaust (like, a before and after or two cars with the same exhausts).

Was just watching a few videos on StreetFire, and found a RollRace where an 05 STi (Monster05) was beating Z06 and supercharged Mustangs (Cobra) on the top end, and that STi is gnarley sounding.
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Old 09-20-2008, 12:02 AM   #2
valetudospang
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Bump! Im interested tOO!
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Old 09-20-2008, 06:39 AM   #3
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Search you tube?

I know the harmin motive car is bored over.
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Old 09-20-2008, 09:07 AM   #4
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Bored and stroked has nothing to do with the sound. Forged internals and cams change things.

Here is a video of my FXT with a built motor. , internals, Headwork and cams.
Keep a couple things in mind

1. This motor had all of 10 min run time on it when I took this video. It was a brand new build, so the underhood noise is quieter. Still you can hear the forged piston rattle a LITTLE bit. Once its broken in, it will be louder

2. The cams are fairly mild. They dont sound much different at idle. Driving down the road the rumble is FAR more pronounced

3. (this has nothing to do with sound) The car wasnt fully back together in this video...

http://www.youtube.com/watch?v=xBCQx_4ZoCg
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Old 09-20-2008, 09:16 AM   #5
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Quote:
Originally Posted by Davenow View Post
Here is a video of my FXT with a built motor. , internals, Headwork and cams.
Keep a couple things in mind
thats a big turbo
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Old 09-20-2008, 09:17 AM   #6
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GT35R .82 with anti surge ports (makes it louder, and widens the efficiency range)
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Old 09-20-2008, 09:19 AM   #7
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Oh and please note that it sounds a LOT more mild in that video. Not sure why. You can hear that its OBVIOUSLY not a normal engine when you hear it in person. Its not super rowdy. But you can hear it.
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Old 09-20-2008, 09:27 AM   #8
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Generally built motors dont sound as well put together, rattles and tapping esp when cold...

Doesnt mean anything though
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Old 09-20-2008, 09:30 AM   #9
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Quote:
Originally Posted by Davenow View Post
Oh and please note that it sounds a LOT more mild in that video. Not sure why. You can hear that its OBVIOUSLY not a normal engine when you hear it in person. Its not super rowdy. But you can hear it.
Mines fairly loud inside as well and Im running stock heads still. I rarely talk on my cell phone for safety reasons in the car but its also very hard to hear. Toss on a Catless full custom exhaust and CAI and the engine is even more amplified. Piston slap is not horrible but you know when your ass is rolling in fully built short block and it feels gooooood!

and +1 love the 4" inlet with Anti Surge its like a symphony of air

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Originally Posted by CynicX View Post
Generally built motors dont sound as well put together, rattles and tapping esp when cold...

Doesnt mean anything though
Agreed, even if you know your car 100% noises and all when your built its like starting over and your always wondering whats is that sound??? In winter you would almost think the cars going to break becasue of the sounds it makes. It's all good
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Old 09-20-2008, 09:52 AM   #10
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Yeah my car sounds like it has big motor problems.

Unless you know what you are hearing

I like how my turbo is audible at .5PSI
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Old 09-20-2008, 02:11 PM   #11
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That makes a lot of sense, thanks Davenow.

And yeah, that is a huge turbo! Very nice Forester.
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Old 09-21-2008, 01:29 AM   #12
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I just got my built engine back in couple weeks ago and it was very different.

Because of the cams the car idles different and every time someone hears it their like yo somethings wrong with your engine.
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