GDI engine problems for consumers. - Chevelle Tech
Engine General Engine Discussion.

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post #1 of 3 (permalink) Old Jun 21st, 19, 11:38 AM Thread Starter
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GDI engine problems for consumers.

Everything that I have learned from these new gasoline engines is this: Less fuel more power. Downside is that in a few miles carbon builds up on the valves. make sure you use top tier gasoline. I think the consumers might lose on this deal.


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post #2 of 3 (permalink) Old Jun 21st, 19, 12:23 PM
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John
 
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Re: GDI engine problems for consumers.

The carbon build up on the GDI engine comes from oil drawn in from the crankcase ventilation system that settles on the intake valves. Since the GDI engines inject fuel direct into the cylinders rather than into the intake, there is no gas to wash past the valves to keep them clean.

I know alot of people are running oil / air separators on the crankcase ventilation line to keep the oil out of the intake.
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Instructions...All I need is the exploded view.
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post #3 of 3 (permalink) Old Jun 21st, 19, 1:34 PM
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Re: GDI engine problems for consumers.

Quote:
Originally Posted by Slick87gn View Post
make sure you use top tier gasoline.

Actually on the GDI engines oil is probably more important than fuel. You absolutely have to use a top quality oil that meets all of the manufacturers specifications. It is oil vapor in the pcv/intake tract that is causing the buildup.

I have some pictures somewhere of some GM valves that were so loaded with carbon that its amazing that any air could get past them. I will try to find them and post them.
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Bill Koustenis
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