Eller de som har testet litt mer enn de som kun ser om de fikk mer effekt med spor enn før de, og ikke om de kunne dra strikken lenger etterpå. Som Jesse Lackman aka Automotive Breath... http://www.speedtalk.com/forum/viewtopic.php?t=4069Opprinnelig postet av Batland
Probably pga erfaringer som dette:
"Tried them a few years ago and did some back to back tests against same engine build on a couple engines. One went to the street and one to a circle track racer. The dyno tests should no change in torque or power, the numbers between modified and unmodified weaved back and forth over a hand full of runs and never varied more than what I consider the accuracy range.
The real world tests didn't show anything on the race engine. However, on the street motor there was a definite short term improvement in detonation resistance in part throttle cruise situations over un-grooved heads. But that went away over several months of use and in fact the engine became more ping prone everywhere and it was not sensitive to octane changes. Disassembly showed the combustion chambers had carboned including the grooves, this where I supposed that this carbon presented a hot spot the ignited the unburnt mix ahead of the flame front causing the pinging."
Dette er miljøgreier på linje med magneter på drivstoffslangene, Halo tennplugger, tornadovifte fremfor gasspjeldet, aceton i bensinen og denne type ting.
Slikt ekskluderer alle bortsett fra de mest fanatisk religiøse optimistene....
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