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Old 09-21-2019, 01:32 PM   #51
F1EA
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Quote:
Originally Posted by xX_STI_Xx View Post
If the new STI will be susceptible to gunk like this on the valves at any point in itís life....Subaru can keep it.
Huh?

Any engine can "be susceptible to gunk like this". For example with engine sludge, all you need is to use non-synth oil. Slack on oil changes and drive it only city stop-go for a few yrs and bam, Subaru sucks.

The key thing here is... is that photo representative of a normally used and reasonably taken care of Subaru DI car?

Based on how few real world complaints have floated around the FA DIT and from how I know people male stupid claims out of weird cases... I say that photo is useless to come up with any conclusion.

The same rubbish argument gets said about the VW Golf all the time. Reliability this reliability that... geez. From all i've seen, the Golfs are perfectly fine.

If Subaru comes up with a DI engine similar to or with similar properties and reliability as the FA20, then I suspect the next STI will be a success, just like the FA WRX has been.
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Last edited by F1EA; 09-21-2019 at 07:59 PM.
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Old 09-21-2019, 03:13 PM   #52
Stretch18
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Quote:
Originally Posted by F1EA View Post
Huh?



Any engine can "be susceptible to gunk like this". All you need is to use non-synth oil. Slack on oil changes and drive it only city stop-go for a few yrs and bam, Subaru sucks.



The key thing here is... is that photo representative of a normally used and reasonably taken care of Subaru DI car?



Based on how few real world complaints have floated around the FA DIT and from how I know people male stupid claims out of weird cases... I say that photo is useless to come up with any conclusion.



The same rubbish argument gets said about the VW Golf all the time. Reliability this reliability that... geez. From all i've seen, the Golfs are perfectly fine.



If Subaru comes up with a DI engine similar to or with similar properties and reliability as the FA20, then I suspect the next STI will be a success, just like the FA WRX has been.

Intake deposits like that have nothing to do with the type of oil you use. Itís a byproduct of DI, specifically, from not having gasoline washing the intake bores like you would on a port injected engine. Combine that with blowby, egr, etc and you get build up on your valves.

I agree with you that itís not really a reliability issue but it is one of those extra side effects that DI engines have to deal with. Definitely not a Subaru exclusive issue, but also not a Ďused the wrong oilí issue either...
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Old 09-21-2019, 04:04 PM   #53
GlarryHoodDIT
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Carbon buildup is a by-product of both DI and PI. They both produce carbon on valves but PI washes them off whereas DI does not. It would be inherently wrong to suggest that carbon does not build up on PI valves, it does, it just gets washed off by fuel before significant deposits form. Faulty or clogged injectors can lead to carbon deposits on valves in PI engines, so clearly it's not just DI that causes this.

DI problems get blown out of proportion by people who dont understand them.
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Old 09-21-2019, 07:55 PM   #54
F1EA
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Quote:
Originally Posted by Stretch18 View Post
Intake deposits like that have nothing to do with the type of oil you use. Itís a byproduct of DI, specifically, from not having gasoline washing the intake bores like you would on a port injected engine. Combine that with blowby, egr, etc and you get build up on your valves.

I agree with you that itís not really a reliability issue but it is one of those extra side effects that DI engines have to deal with. Definitely not a Subaru exclusive issue, but also not a Ďused the wrong oilí issue either...
I was actually going to tie the example to oil sludge and how you can get ANY well-designed, reliable engine to produce similar "impactful" results simply from continued neglect or abuse. But kinda lost the train of thought while writing, so edited above...

What I'm trying to get at is that a photo in itself, with no context, means nothing.

On top of all that, as crappy as those valves look.... that's not going to seize your engine. And again, if it means you meed to do a walnut blasting, top end cleaning etc as regular maintenance, after 50k or whatever, it is not the end of the world and a reasonably accepted maintenance item.

But yeah, if a random photo gives you enough info to make a $40k decision. That's good. Choose either way... truth is, nobody is really out to make or change your mind.

Last edited by F1EA; 09-22-2019 at 01:55 PM.
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