Re: [Chrysler300] Pinging & Timing

[Gary W Nelson <gwn@xxxx>]

Hi Herman and Gang
Herman is correct. His statement re: water to remove carbon is as old as 
the hills as they say. Over 40 years ago we used to trickle water into the 
carb. Likely around 2500 to 3500 rpm. We never had rpm gauges so it was a 
guess work.
One thing Herman did not mention, I was taught to only do this with the 
engine at operating temperature. The engine will bog down if you pour water 
in to fast. It will spit and sputter, but should not die. The way I used to 
do it is to fill a small soda bottle or the like with a small opening that 
you can put your thumb over to control flow. Don't let the water gush in.
Another point Herman makes is blocking the heat cross over on the intake 
manifold. I highly prescribe to this practice. The motor may take a little 
longer to warm up, but the benefits are worth it. I am not an expert in 
this area, but the excess heat in the manifold plus the higher ambient air 
under the hood will dramatically reduce performance as it reduces air 
density. Motors thrive on oxygen. Look at any late model car and I think 
they all draw intake air through the grill and not under the hood.
I also remove the heat riser butterfly as it is no longer needed to force 
exhaust gas through the manifold.
Some may ask how do you block off the cross over on the intake manifold. 
Herman said it when he said he forgot when he had his engine down last 
time. You must have the manifold off. You need to physically block the 
cross over passage on both sides of the intake manifold. I use .020" 
stainless steel and cut approximately 1/4" larger than the opening on each 
head. Use a thin coat of RTV sealant and put onto head or the gasket. Let 
it set up so it won't go slipin and slidden when you go to install the 
manifold.
Hope my two cents helped.
Gary The Parts Doc


At 10:50 PM 9/18/2001 +0200, Herman wrote:
> I have heard a 'possible' way to get rid of that excessive carbon
> buildup in your engine.
>
> This, of course, is a very lowbuck solution...!
> I've never tried this myself yet, but you can 'trickle' some drops of
> water in your carb with the engine at 2500 rpm or higher.
> This 'boils' the carbon out of the cylinders somewhat.
> Care must be taken not to put too much water in at a time because of the
> danger of a waterlock, but you must be very generous
> with water if you're able to fill up a 90 cc head-chamber with water at
> 2500 rpm...
> Has anyone done this before, so you can clarify if this works as they
> say it does?
>
> Of course the only proper way to remove the carbon is to pull the heads.
>
> My '62 NewYorker Wagon 413 also pings when the engine is hot...
> And we even have 98 octane pumpfuel here...!
> Blocking the heat-crossover passage in the intake manifold does help a
> lot against pinging.
> I neglected this when I had the engine apart the last time. And it
> started pinging after that.. :o(
>
>
> Herman.