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What are some natural problems for inline-four engines like our Prelude's?

 
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Old 09-24-2012, 09:57 PM
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What are some natural problems for inline-four engines like our Prelude's?

The four cylinder engine apparently (as I've read) has imbalance during the ignition processes (combustion).. as quoted from Wikipedia.org: "... two pistons are always accelerating faster in one direction, while the other two are accelerating more slowly in the other direction, which leads to a secondary dynamic imbalance that causes an up-and-down vibration at twice crankshaft speed. This imbalance is tolerable in a small, low-displacement, low-power configuration, but the vibrations get worse with increasing size and power."
(Inline-four engine - Wikipedia, the free encyclopedia)

So my question is more of a tech-talk kind of question that is open to discussions as well. Like the Subaru boxer engines after year 2007 that need to have their ECU modified in order to prevent them from experiencing detonation (especially the turbo models), Subaru did this to meet the US emissions regulations. It's a simple fix for the car to save your engine in the future..

Also: what exactly does the VTEC do for the four cylinder to enhance it? And why do a lot of people recommend non-Vtec for using turbos (I think this is a controversy, actually)? How high of a rev is TOO much for our larger-than-average 4 cylinders?
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Old 09-25-2012, 09:15 AM
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Re: What are some natural problems for inline-four engines like our Prelude's?

An Inline 4 is naturally unbalanced, which is why Honda uses balancer shafts to counteract the imbalance. But that's not really a "problem", just a side-affect of the design.
Inline 6's on the other hand, are naturally balanced due to their design.


Quote:
Originally Posted by mbman88 View Post
The four cylinder engine apparently (as I've read) has imbalance during the ignition processes (combustion).. as quoted from Wikipedia.org: "... two pistons are always accelerating faster in one direction, while the other two are accelerating more slowly in the other direction, which leads to a secondary dynamic imbalance that causes an up-and-down vibration at twice crankshaft speed. This imbalance is tolerable in a small, low-displacement, low-power configuration, but the vibrations get worse with increasing size and power."
(Inline-four engine - Wikipedia, the free encyclopedia)

So my question is more of a tech-talk kind of question that is open to discussions as well. Like the Subaru boxer engines after year 2007 that need to have their ECU modified in order to prevent them from experiencing detonation (especially the turbo models), Subaru did this to meet the US emissions regulations. It's a simple fix for the car to save your engine in the future..

Also: what exactly does the VTEC do for the four cylinder to enhance it? And why do a lot of people recommend non-Vtec for using turbos (I think this is a controversy, actually)? How high of a rev is TOO much for our larger-than-average 4 cylinders?



O rly?!!?
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But you need that scoop on the hood. Is it true that they're big enough to fit your lunch box and all your camera gear in it?
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Old 09-25-2012, 12:40 PM
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Re: What are some natural problems for inline-four engines like our Prelude's?

A Boxster style engine is naturally balanced, as the piston's forces directly oppose each other. Plus, they usually sound pretty damn wicked.
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Old 09-25-2012, 12:50 PM
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Re: What are some natural problems for inline-four engines like our Prelude's?

Quote:
Originally Posted by twokexlv6coupe View Post
An Inline 4 is naturally unbalanced, which is why Honda uses balancer shafts to counteract the imbalance. But that's not really a "problem", just a side-affect of the design.
Inline 6's on the other hand, are naturally balanced due to their design.


O rly?!!?
Yeah I was talking to a guy who ripped up the track with his 2011 STi. He had an ECU modifying device with a bunch of different maps to use for specific situations, such as using high-octane fuel or being forced to operate really ****ty low-octane fuel. But that device cost him $600, as he said "It's worth the price to keep your engine"

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A Boxster style engine is naturally balanced, as the piston's forces directly oppose each other. Plus, they usually sound pretty damn wicked.
Yeah they do..



I guess I could ask "Are there any major flaws for these Preludes (like H23a, F22 and F22VTEC models) that could be fixed very simply? (not necessarily cheap)"

So yeah, I talked to the guy who had the Subaru and that's what got me wondering whether my car could have some stock things that should be improved on.. I'm not extensively modding my car... yet... so I just don't have the experience/wisdom to know.
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Old 09-25-2012, 12:56 PM
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Re: What are some natural problems for inline-four engines like our Prelude's?

Quote:
Originally Posted by mbman88 View Post
Yeah I was talking to a guy who ripped up the track with his 2011 STi. He had an ECU modifying device with a bunch of different maps to use for specific situations, such as using high-octane fuel or being forced to operate really ****ty low-octane fuel. But that device cost him $600, as he said "It's worth the price to keep your engine"



Yeah they do..



I guess I could ask "Are there any major flaws for these Preludes (like H23a, F22 and F22VTEC models) that could be fixed very simply? (not necessarily cheap)"

So yeah, I talked to the guy who had the Subaru and that's what got me wondering whether my car could have some stock things that should be improved on.. I'm not extensively modding my car... yet... so I just don't have the experience/wisdom to know.


It's called a Cobb Accessport
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2005 Stage2.5+ Subaru WRB STi : RzKar!
Ivey Tuned - Advan - Cobb - Rallispec - CP - Perrin - ACT - KillerB - Carillo - TurboXS - Defi - Innovate - Walbro - DeatschWerks - Feal - H&R - Alpine - Infiniti - Curt

2001 Kawasaki STX1100 D.I. - Sold!
2007 Sea-Doo RXT 215; ET 127 +3 S/C impeller, DIY 3" intake, DIY resonator delete/free flow exhaust, DIY oil catch can, Rule 500gph bilge pump


Quote:
Originally Posted by Brash View Post
But you need that scoop on the hood. Is it true that they're big enough to fit your lunch box and all your camera gear in it?
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Old 09-25-2012, 02:37 PM
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Re: What are some natural problems for inline-four engines like our Prelude's?

The major flaw with these engine is people putting on ebay parts and ruinning the engine
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Old 09-26-2012, 09:58 AM
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Re: What are some natural problems for inline-four engines like our Prelude's?

Cobb accessport... I'm guessing there's not too many of these devices, then?

haha, avoid eBay
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