2 replies to this topic

[Kyle Burkhardt]

I've got a bottle each of Lubro Moly injector cleaner and valve cleaner. Used to use them once a year on the BMW. Pros/cons to dumping them in the miata tank?

[davew]

For the sake of full disclosure, I now offer off car fuel injector cleaning. I spent the dollars to buy the machine, so my opinion may be biased. But it is just an opinion ;-))

Non of the pour in conditioners will hurt anything. It is possible that they may contain a banned additive, that may show up in a fuel sample test.

The concentration levels of cleaning agents are not very high when you dilute a 12 ounce can into a 10+ gallon tank. Again, they probably can not hurt anything, may have some benefit as a preventative measure, but will not do much good to fix a problem.

After cleaning several hundred injectors on my new machine, I have found one very interesting thing. Clean injectors flow less fuel. Counter intuitive until I thought about it for a while. A clean injector will seal better than a dirty injector when in the "off" position. Even at 7000 rpm the injector is only running about 75% on.  fi mach 011.jpg   55.87KB   37 downloadsThe pintle (similar to a needle valve) also moves freely, thus faster and will close quicker when going into the off position. Kinda like an engine valve with a weak valve spring that causes float. less fuel = leaner = more power

The pic shows a set of 1.6 injectors with 4 seasons of racing since being cleaned by a very reputable injector shop. look at the spray pattern of #2 and #4. Number 4 cleaned up in one cleaning cycle. #2 has been cleaned 5 times and still looks like this. It was replaced.

Before and after dyno pulls on this car was a gain of 1.5hp with clean injectors.

Dave

[Kyle Burkhardt]

Thanks, dave. You are on my list for next year's prep. I just had these bottles in the garage and wanted to make sure it wouldn't hurt anything to dump em in.