A friend of mine at work was talking to me about my truck and brought up a good point. Is it odd for a engine especially one with all forged internals to have a redline set at 5250 RPM's? I would think this engine would be safe to at least 6500 RPM's. The only reason I could think of is it is set low because of the blower RPM limit. With the engine turning 6000-6500 the supercharger would be over it's safety margin. This sound correct to anyone else? Also are the 5.4 blocks 6 bolt main cap engines or 4 bolt? I thought I had seen a picture of one apart and it was 6 bolt. Thanks for any input.

 

We stop making power after a certain RPM, especially with a roots style blower. I'm not sure what the max should be, but I would say no more than 5600-5700.

 

I know the 4.6 dohc is a 6 bolt main, so I am ASSUMING the 5.4 is too.

 

Gentlemen:

How about peak piston speeds with the long-stroke 5.4 truck motor? I think they're already very high with the stock redline. I'm sure somebody knows the answer. Please don't make me calculate it.

 

My chip shifts at 56-5700. Runs great. No problemos.
noelvm

 

Here is a couple of interesting links about the 5.4

6,000 RPM Rods:
http://www.oemfordparts.com/faq/modularv8.htm#5.4L SOHC

Cobra R based on Ford's Triton 5.4
http://www.motorsportsengineering.sa...y/ultstang.htm


David