Direct injection injector angle & valve cleaning

[SteveSRT8]

Originally Posted By: Olas
Originally Posted By: SteveSRT8
Originally Posted By: andyd
What is a "wet manifold"? I'm not familiar with the term. My BMW's engine just has a breather chucked into the air stream. They also had a coolant loop to take the chill off, but it didn't really help much, compared to its tendency to leak, hence a wet manifold?

Andy, you need a carburetor to have a wet manifold. Since everything went fuel injection all the manifolds are optimized for airflow and they don't have to worry about fuel puddling here or there.

Olas, we can't all go back to 50's tech here. We have rules and regs. A road draft tube was on my 55 Desoto but you won't find one on any modern car. We have trucks with extremely high mileage that have spotless intakes and valves, but no DI here yet...


If you don't want a road draft then use the exhaust to pull vacuum on the crank case - I bet you'll see lower pressure that way than you would using the normal system. And I'm not trying t be confrontational but I really can't believe that you have PCV vapour and egr soot mixing together and still have a clean inlet tract, is there an inverse oiler in there somewhere?


Olas,

Not all the vehicles in my stable have EGR. My sig car is one example, listed as a ULEV yet no EGR.

With our fleet trucks, all are v-8's, all have egr, no special maintenance, all factory equipment in place. We do occasionally add a splash of Kreen in the fuel to control carbon knocking due to all city driving cycle. I have sold them at 500k miles still running great and clean...

 

[badtlc]

Mazda came to the conclusion that intake valve temps weren't high enough on DI engines having deposit issues. Their main fix was to design high temp intake valves that won't result in PCV vapors condensing on the valves in the first place.

Either way, the deposits burn off rather easily. No reason to fear the deposits.

 

[gregoron]

Originally Posted By: badtlc
Mazda came to the conclusion that intake valve temps weren't high enough on DI engines having deposit issues. Their main fix was to design high temp intake valves that won't result in PCV vapors condensing on the valves in the first place.

Either way, the deposits burn off rather easily. No reason to fear the deposits.


Yes, I read that raising the temperature of the intake valves (i.e. high revs) could burn off light carbon deposits sort of like an oven-cleaning method.

I'm hoping that the heat from my GLI's Gen 3 EA888 integrated cylinder head and exhaust port could contribute to that. That, and the redesign of the EGR and PCV valve.