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Mechanical / Re: Clutch Fan
« Last post by nUcLeArEnVoY on Today at 11:20:12 AM »A standard duty clutch fan was what was equipped from the factory, which would be a Hayden 2705. This was even for AC cars.
Most owners upgrade to the Heavy Duty 2747, which is JUST barely applicable for the 18.5-19" Pontiac 400 or Olds 403 fans. This is what I use and it cools very well.
Still, others overkill and use the Severe Duty 2797. The issue with using this clutch is that it is meant for fans with a much larger pitch than any factory fan, and as a result it is pretty much engaged 100% of the time. This overcools the motor as well as robs engine power due to how stiff it is.
Most owners upgrade to the Heavy Duty 2747, which is JUST barely applicable for the 18.5-19" Pontiac 400 or Olds 403 fans. This is what I use and it cools very well.
Still, others overkill and use the Severe Duty 2797. The issue with using this clutch is that it is meant for fans with a much larger pitch than any factory fan, and as a result it is pretty much engaged 100% of the time. This overcools the motor as well as robs engine power due to how stiff it is.