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Join Date: Jan 2010
Location: NE CT
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carbon buildup on intake valves

As some of you know, I'm in the middle of my EFI project. I'm not tearing into the engine during this project 57K miles. I want to get everything working correctly and save a rebuild for when I replenish my piggy bank in the future. I did replace my valve seals due to oil consumption at the rate of 1 quart per 800 miles. the valve guides felt good, but it was obvious the seals were worn. I noticed while preparing to mount my carerra intake there is a lot of carbon buildup on the bottom of the intake valves (when viewed through intake port). My project will include water/meth injection, which I understand will help clean/loosen buildup. My concern is loosening up this crap will cause other issues. Anyone have suggestions?
Old 03-18-2011, 10:19 AM
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I don't think you have anything to worry about there.

A bottle of Chevron Techron in the gas tank will probably loosen carbon off the backside of the intake valves better than water or water methanol injection and what actually comes off will blow through and out the exhaust.
Techron works better at not building up carbon on the backside of the intake valves in the first place when there is none there to start with. Thats a good reason to use Chevron gas that already has some in it.
I've heard Mobil gas has it too but not sure about that.
I've never seen techron actually remove hard cooked on already exsisting intake valve carbon with nothing more than air/fuel flow velocity to supposedly blow off the carbon.
If you've ever scraped at it you'll see how hard it is to remove.

Water injection will turn to steam in the combustion chambers and do some steam cleaning in there but won't completely clean them out - BTDT many years ago on a 3.5 liter 6 cylinder BMW with water injection and pulled the head afterward when a rocker arm broke (BMW rocker chafts are long and the head has to come off to drive them out). Again no worries.. any tiny loosened carbon particles will just blow out the exhaust and won't do anything to the exhaust turbine. Not sure what effect it may have on a catalytic converter, but probably nothing.
Old 03-18-2011, 11:50 AM
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I've had awesome results using BG-44K. The Porsche dealer I used to frequent in Cincy turned me onto this stuff and it is awesome. I was having problems and ran a can through a tank. Within 15 miles my mixture was way out and I had to reset the mixture. It ran so much better afterwards. I ran another can through and changed the oil. I use one before every oil change now and have none of the original problems.
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Old 03-18-2011, 01:32 PM
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What is BG-44K?
Old 03-19-2011, 12:48 AM
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Anyone else try this? BG-44k stuff?

Snake oil??

http://www.bgprod.com/products/fuelair.html

DATA: http://www.kansasbg.com/complete_set_of_msds/208.pdf

Last edited by Benny771; 08-29-2011 at 07:23 AM..
Old 08-29-2011, 07:18 AM
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Max Sluiter
 
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Careful with that stuff. It will clean the engine, but it may ruin any marginally old/tired fuel system components like fuel pressure regulators.

It is super concentrated Poly-Ether-Amine (PEA) which is the same stuff in Techron and Shell gasoline with Nitrogen.

BG 44K Fuel System Cleaner
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Old 08-29-2011, 10:08 AM
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