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Old 04-11-2004, 02:48 AM   #1
Lee Chun
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Question How common is it to blow Cyl 4?

It seems like I see threads all over the place about Cylinder #4.

Does a huge number of owners encounter this problem, or is it mainly highly modded WRXs with improper tuning (lean, detonation, etc)? How common is this problem?
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Old 04-11-2004, 12:09 PM   #2
Uncle Scotty
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Are you telling me that you havent seen this thread????
http://forums.nasioc.com/forums/show...hreadid=416756
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Old 04-11-2004, 12:14 PM   #3
blackie
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and wheres your egt probe at uncle scooty?
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Old 04-11-2004, 01:04 PM   #4
Lee Chun
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Quote:
Originally posted by Uncle Scotty
Are you telling me that you havent seen this thread????
http://forums.nasioc.com/forums/show...hreadid=416756
Of course I've seen that thread. It doesn't account for the prevalance of the problem, though. It just shows how many people on NASIOC that wanted to vote and say they blew their motors.
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Old 04-11-2004, 01:09 PM   #5
8Complex

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Quote:
Originally posted by Lee Chun
Of course I've seen that thread. It doesn't account for the prevalance of the problem, though. It just shows how many people on NASIOC that wanted to vote and say they blew their motors.
Well, that poll says 32:20 who has blown #4 versus other cylinders.
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Old 04-11-2004, 01:10 PM   #6
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Quote:
Originally posted by blackie
and wheres your egt probe at uncle scooty?
In a MUCH better place than yours is/will be, I'm sure

In the casting button on the 2/4 manifold.
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Old 04-11-2004, 01:23 PM   #7
digitalmethods
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It's a problem w/ leaning out and becoming too hot usually. Too much boost or just the wrong fuel mix. The cylinder isn't the problem rather than the placement of the turbo. Look at the JUN car. There is a reason why the entire setup is different. This is usually only a problem for people who want to push their cars w/out the proper knowledge of turbos and high horsepower. It's easy to get horsepower but how long can you make it run?
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Old 04-11-2004, 01:31 PM   #8
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Quote:
Originally posted by digitalmethods
It's a problem w/ leaning out and becoming too hot usually. Too much boost or just the wrong fuel mix. The cylinder isn't the problem rather than the placement of the turbo. Look at the JUN car. There is a reason why the entire setup is different. This is usually only a problem for people who want to push their cars w/out the proper knowledge of turbos and high horsepower. It's easy to get horsepower but how long can you make it run?
Well, it's also somewhat evident that #4 runs hottest, perhaps due to greater airflow, perhaps due to poor cooling.

Tune safely, and you can make real power, but stock internals are still stock internals...

-Sean
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Old 04-11-2004, 01:38 PM   #9
digitalmethods
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If it has the most airflow can you match the ports and even out the airflow then compensate the fuel and run evenly across the boards? Same flow + good tuning = even temps.

Also your definately right about the stock internals being for a stock setup.
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Old 04-11-2004, 01:46 PM   #10
subywrxwrblu
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what is the placement of the cylinders?

I just did a sparkplug change and the back passenger sparkplug's electrode was basically missing on the ones I took out.

The gap checked to .050 while all of the others were at .032, they were originally gapped to .029.

Thanks
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Old 04-11-2004, 01:54 PM   #11
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Well, the turbo is in front of/next to #3, not #4.

I am unsure exactly why #4 leans out, though I had some theories back in the day about the fuel flow and pressure loss through the fuel rails. #4 does have the longest and most kinked intake runner. It also has the brake booster line tapped into it.
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Old 04-11-2004, 02:59 PM   #12
Lee Chun
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I was looking for something along the lines of X% of people with X blow their motors. Just curious. I guess it's impossible to really gather that information though. I don't care how many people on NASIOC have blown motors...
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Old 04-11-2004, 05:44 PM   #13
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Default Re: How common is it to blow Cyl 4?

Quote:
Originally posted by Lee Chun
It seems like I see threads all over the place about Cylinder #4.

Does a huge number of owners encounter this problem, or is it mainly highly modded WRXs with improper tuning (lean, detonation, etc)? How common is this problem?
On a stock car, it is not an issue, partly becausre Subaru has the car running very conservatively from the factory....Their tune also explains why you might have a hard time with Maximas, and other cars on the highway in stock form.

It is when people start modding that that the problems arise... People tend to max out their tune based on mods.... For example, if they want 300 WHP, they get a turbo that can barely get them there with an aggressive tune.... What they should do is to get parts that will get them to their power goals with some breathing room. As a result, you don't need to push things to the limit in order to get the power...
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Old 04-12-2004, 09:13 AM   #14
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96% of people with the "Type-R Sticker Mod" blow their engines in a mean time of 23.3564 days.

sorry...

Most people that blow engines run beyonf their tune - a good tune will take care of an engine at 95%. A bad tune will blow an engine at 75%.

-Sean
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