Not making it an issue. Just think the manufacturer should have done this to begin with. Very expensive vehicle to have to do this to. No contaminates should be getting in to begin with.
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Why Direct Injection Develop Carbon Deposits
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Originally Posted By: millerbl00
Not making it an issue. Just think the manufacturer should have done this to begin with. Very expensive vehicle to have to do this to. No contaminates should be getting in to begin with.
I agree. To a certain degree however they have their hands tied behind their backs especially in the case of the diesel in the US market.
Not making it an issue. Just think the manufacturer should have done this to begin with. Very expensive vehicle to have to do this to. No contaminates should be getting in to begin with.
I agree. To a certain degree however they have their hands tied behind their backs especially in the case of the diesel in the US market.
Just use a good fuel injector cleaner like chevron and should not have a problem
Originally Posted By: Ram01
Just use a good fuel injector cleaner like chevron and should not have a problem
How is it going to help with DI deposits?
Just use a good fuel injector cleaner like chevron and should not have a problem
How is it going to help with DI deposits?
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Originally Posted By: MCompact
Originally Posted By: Mykl
Man, by that logic we should completely give up on internal combustion engines entirely. Those things are nothing but trouble.
Look on the bright side; all these hand-wringers obsess about DI "issues" so that we owners don't have to!
+1
Originally Posted By: Mykl
Man, by that logic we should completely give up on internal combustion engines entirely. Those things are nothing but trouble.
Look on the bright side; all these hand-wringers obsess about DI "issues" so that we owners don't have to!
+1
Originally Posted By: 440Magnum
Originally Posted By: weasley
So one wonders why diesel engines don't suffer intake valve deposit problems in the same way?
No mystery there at all. Diesel engines have no throttle blade in the intake path, the air velocity and volume flow over the stem of the intake valves is high all the time- even at idle. there's virtually no reversion flow out of the cylinder into the intake, no vacuum in the intake, and the intake is comparatively cool with fresh air constantly sweeping through. Even in a turbo application where the intake air can be very hot, there's no vacuum and little reversion.
A GDI engine has a throttle, so at idle there is very little airflow, a lot of reversion (back-flow) out of the cylinder and into the intake that can even include exhaust gasses from the previous combustion cycle, and there's a high vacuum condition in the intake that draws oil past the intake valve stems and into a hot, stagnant, condition that's ripe for cooking it to hard carbon deposits.
Great explanation. Even I can understand that.
Originally Posted By: weasley
So one wonders why diesel engines don't suffer intake valve deposit problems in the same way?
No mystery there at all. Diesel engines have no throttle blade in the intake path, the air velocity and volume flow over the stem of the intake valves is high all the time- even at idle. there's virtually no reversion flow out of the cylinder into the intake, no vacuum in the intake, and the intake is comparatively cool with fresh air constantly sweeping through. Even in a turbo application where the intake air can be very hot, there's no vacuum and little reversion.
A GDI engine has a throttle, so at idle there is very little airflow, a lot of reversion (back-flow) out of the cylinder and into the intake that can even include exhaust gasses from the previous combustion cycle, and there's a high vacuum condition in the intake that draws oil past the intake valve stems and into a hot, stagnant, condition that's ripe for cooking it to hard carbon deposits.
Great explanation. Even I can understand that.
Originally Posted By: Clevy
Originally Posted By: 440Magnum
Originally Posted By: weasley
So one wonders why diesel engines don't suffer intake valve deposit problems in the same way?
No mystery there at all. Diesel engines have no throttle blade in the intake path, the air velocity and volume flow over the stem of the intake valves is high all the time- even at idle. there's virtually no reversion flow out of the cylinder into the intake, no vacuum in the intake, and the intake is comparatively cool with fresh air constantly sweeping through. Even in a turbo application where the intake air can be very hot, there's no vacuum and little reversion.
A GDI engine has a throttle, so at idle there is very little airflow, a lot of reversion (back-flow) out of the cylinder and into the intake that can even include exhaust gasses from the previous combustion cycle, and there's a high vacuum condition in the intake that draws oil past the intake valve stems and into a hot, stagnant, condition that's ripe for cooking it to hard carbon deposits.
Great explanation. Even I can understand that.
Except that light duty diesels do have carbon deposit issues. Throttle plate has nothing to do with it.
Originally Posted By: 440Magnum
Originally Posted By: weasley
So one wonders why diesel engines don't suffer intake valve deposit problems in the same way?
No mystery there at all. Diesel engines have no throttle blade in the intake path, the air velocity and volume flow over the stem of the intake valves is high all the time- even at idle. there's virtually no reversion flow out of the cylinder into the intake, no vacuum in the intake, and the intake is comparatively cool with fresh air constantly sweeping through. Even in a turbo application where the intake air can be very hot, there's no vacuum and little reversion.
A GDI engine has a throttle, so at idle there is very little airflow, a lot of reversion (back-flow) out of the cylinder and into the intake that can even include exhaust gasses from the previous combustion cycle, and there's a high vacuum condition in the intake that draws oil past the intake valve stems and into a hot, stagnant, condition that's ripe for cooking it to hard carbon deposits.
Great explanation. Even I can understand that.
Except that light duty diesels do have carbon deposit issues. Throttle plate has nothing to do with it.
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