ignorant wrote:
but the billowing clouds of foul smelling smoke must mean that it works....
Think of of it like this.
Sometimes when you fart in the kitchen, someone gets a whiff and is shocked and maybe even angry (ask my wife...) or hurt and confused.
Now get into a closet and fart with someone else in there. There will be much confusion, anger, sadness and lashing out. That is what happens when you seafoam your engine...everyone gets a whiff, yes, some more than others, but it stinks for everyone in the closet.
There's so much vapor in the intake it really doesn't matter how long the ports are etc. When I pulled an SHO Yamaha Intake apart after years of use and a few Seafoam treatments a year it was all very clean.
Long runners and short runners alike got a whif.
As a side note, back in the day we used to just use water for this. Seafoam, with it's solvent, holy water or whatever they use, works better. (make waaaaay more smoke on a dirty motor as well...)
RJ
PS...foul smelling? Seafoam smoke doesn't even rate on my Nasty-o-meter. You must not have kids