[Fstlane]

So I was reading an article this morning about the LT engine.
One thing that was mentioned was that a upper clydinder clean should be performed every 10k miles. The article interfered that there was some additive or chemical clean which takes care of carbon build up on the valves. My son has a ZLE and we installed an upper pulley at 8.5k and looked into the intake side of the head and it looked pretty nasty for such a new stock car. My ZL1 now has about the same mileage. So can can someone shed some light on what is available to do a clean?

[CalgaryZL1]

I you feel it’s necessary you could use this.
https://www.crcindustries.com/gdi/

[XXX ZL1]

I work for BG Products and we have induction service kits for direct injection, but not on the ZL1 with positive displacement blower. Nothing will work correctly on a PD car due to the intercooler bricks knocking chemical out of suspension and blower heat making it evaporate prior to getting to the valves.

[Fstlane]

The article also mentions that the LT5 engines do not have the problem due to the fact that the secondary injectors spray directly in to the valves or on the valves? Can this be added to the LT4?

[CalgaryZL1]

If you haven’t installed a catch can yet that Helps keep the unwanted stuff out of the engine

[Fstlane]

Yes a catch can is an option, but I have read so many conflicting posts that I am taking the info with a grain of salt. I do know that a stock ZL1 at 10k miles has a considerable carbon build up and GM must have a recommendation or procedure to help.

[Fstlane]

Originally Posted by XXX ZL1

I work for BG Products and we have induction service kits for direct injection, but not on the ZL1 with positive displacement blower. Nothing will work correctly on a PD car due to the intercooler bricks knocking chemical out of suspension and blower heat making it evaporate prior to getting to the valves.

I heard good things about BG....sad that won't work for the LT4

[ZLRob]

Originally Posted by Fstlane

The article also mentions that the LT5 engines do not have the problem due to the fact that the secondary injectors spray directly in to the valves or on the valves? Can this be added to the LT4?

That would be MPI. It technically CAN be added on, but it will cost you a pretty penny to do so. Depending where you live it is also not original equipment to the vehicle so it may cause you to fail visual emissions as well.

Originally Posted by Fstlane

I heard good things about BG....sad that won't work for the LT4

BG has always been top notch. That being said, DI is a difficult cat to skin when it comes to PD cars like the LT4 or any boosted engine because of what has been mentioned above.

[SFV1LE]

Does running E85 clean your engine after it's been running on gasoline for 10K?

I know engines running 100% E85 are very clean when they are opened up for head work.

[ZLRob]

Originally Posted by SFV1LE

Does running E85 clean your engine after it's been running on gasoline for 10K?

I know engines running 100% E85 are very clean when they are opened up for head work.

I just had my engine apart when I did my oil pump, DOD delete and cam. I had to remove the heads to do the DOD delete and got a chance to look at the pistons and valves. I had been running E50 for a while. The engine wasn't dirty dirty per se. I had been running E50 for about 7 or 8K miles...

To answer your question, I couldn't tell you for sure, but I do run full pump E all the time now, so I know it can't hurt.

[Z OH 6]

Originally Posted by SFV1LE

Does running E85 clean your engine after it's been running on gasoline for 10K?

I know engines running 100% E85 are very clean when they are opened up for head work.

E85 engines are MUCH cleaner internally than a gas engine.

[Fstlane]

Good to know...flex fuel sensor installed and tune in progress!

[LiqTenExp]

Originally Posted by Fstlane

So I was reading an article this morning about the LT engine.
One thing that was mentioned was that a upper clydinder clean should be performed every 10k miles. The article interfered that there was some additive or chemical clean which takes care of carbon build up on the valves. My son has a ZLE and we installed an upper pulley at 8.5k and looked into the intake side of the head and it looked pretty nasty for such a new stock car. My ZL1 now has about the same mileage. So can can someone shed some light on what is available to do a clean?

Run 50/50 water/methanol as a cooling method to MAT and you will clean your engine every time you get on it

[arpad_m]

Originally Posted by ZLRob

That would be MPI. It technically CAN be added on, but it will cost you a pretty penny to do so. Depending where you live it is also not original equipment to the vehicle so it may cause you to fail visual emissions as well.

Another reason I'm personally not a big fan of current port injection solutions for the LT1/LT4 is the separate ECM one has to run for PI that is an "alien body" in the car's system. The LT5 dual injection setup would be a much nicer integrated solution, but I haven't seen it on offer (it's unlikely to be an easy fit for my pre-refresh car anyway).

Originally Posted by LiqTenExp

Run 50/50 water/methanol as a cooling method to MAT and you will clean your engine every time you get on it

The ultimate Italian tuneup, ha