With all due respect, the spark plug did not cause your engine to loose 50hp. If your shop is any good at looking at the engine calibration, they would in no uncertan terms be able to tell you what parameters where out of whack to cause the power loss. Just shrugging their shoulders and blaming the plugs is total BS, with no basis in calibration engineering.
With all due respect, the spark plug did not cause your engine to loose 50hp. If your shop is any good at looking at the engine calibration, they would in no uncertan terms be able to tell you what parameters where out of whack to cause the power loss. Just shrugging their shoulders and blaming the plugs is total BS, with no basis in calibration engineering.
There may have been misfires due to a cracked plug or plug boot, there may have been misfiring due to excessive plug gap that they may have cut down when the next set of plugs where installed. our experience with boosted ford engines is they will misfire when running the stock plug gap.
Our plugs have been tested at Livernois Motorsprots and Thompson Racing engines and have never contributed to a "power loss' just because there are Autolite plugs in the engine. Our plugs are used in over 80% of all the top fuel cars in NHRA, they wouldnt use them if they caused a power loss over competitors plugs.
I strongly encourage the four guys I am sending plugs to please post your results so we can all see the truth.
What your saying does not make sense unless two of the plugs or boots were damaged during installation. Lets see the datalog for the dyno run. You can send me the plugs and I will have them checked in our engineering lab. I hear things like this from mechanics all the time, it usually goes, I installed Autolite and the car misfired, I took them out and installed Motorcraft and it ran great. There is no difference between Autolite and Motorcraft other than the paint job on the insulater. There is more to this stroy than what you or your tuner are revealing. Lets see the datalog?
At the risk of sounding rude, if you do not know what spark plug gap is, you may just want to have your friendly neighborhood Ford dealer/repair center work on it.
With all due respect to the Autolite guy (and I mean that; I have nothing at all against Autolite plugs), iridium plugs are of minimal value in an N/A car. SergntMac did actual dyno tests between the once-popular Denso Iridiums and plain old Motorcraft coppers and found the iridium plugs were worth only about 4 HP...and even that wasn't consistent. For the large difference in cost, they just aren't worth it. Use the plain copper Autolites and buy your wife/girlfriend/dominatrix something nice with the rest of the money.
