2.5L Redline

[4x4wannabe]

Does anyone know what the safe redline is for the 2.5L I4 ranger engine? I just bought a instrument cluster with tach to replace my old one without a tach and I'm curious whats safe for these motors.

 

[Captain Ledd]

I'd say 6K. The power starts dropping off at roughly 5500 anyways.

 

[Citoriplus]

Don't worry about it, the engine will bump into the ECM's rev limiter at around 6200rpm. But I would not go much over 5500 any, its like the Capt said.
The power curve on a 2.5L drops off fast over 5500 and its not worth flogging the poor thing for nothing.

 

[adsm08]

I don't usually break 4 grand.

 

[Citoriplus]

The later 2.5's were tough little engines, mine was still going when I got rid of it at over 300K on it.
But they do have an soft spot and that's the pistons and rods.
They are not forged or even iron, their made of compressed aluminum powder.
So pushing one of them really hard without upgrading the internals is asking for problems.
The kind of problems that get really messy and expensive.

 

[mattpresley]

Im all with the 5500 as posted above

 

[4x4wannabe]

Thanks for all the replys! My 2.5 has 185k on it and we have never had any problems with it, (except pinging, spark knocking) since the day my dad bought it new. I usually try to accelerate shifting at about 3k or less but I dont know exactly since I don't have my tach cluster installed yet. So I'm not the typical teenager that floors it everytime I take off lol, I was just curious about a safe max rpm for my engine. I think I'll avoid going over 5k since my engine is getting older and I'll avoid turning that many rpm often.

 

[mattpresley]

aaah youll be fine at 5500. the 2.5 is designed to be a durable and high revving engine. IMO the most reliable 4 cyl ever but in a ranger

 

[adsm08]

Yeah, 4-bangers are meant to rev higher than larger engines. That's why chevy 4s have a larger oil sump than the 6s.

 

[4x4wannabe]

this is kinda changing the subject, but it still has to do with the four cylinders, does anyone know why ford decided to put two spark plugs in each cylinder? The only thing I have a problem with is it makes changing spark plugs a pain in the rear end.

 

[mattpresley]

this is kinda changing the subject, but it still has to do with the four cylinders, does anyone know why ford decided to put two spark plugs in each cylinder? The only thing I have a problem with is it makes changing spark plugs a pain in the rear end.

Cause ford wants to be a pain in our asses

 

[4x4wannabe]

hahaha My dad got so frustrated when he was trying to change them last spring that he handed me the ratchet and said it was my truck now so I could do all the maintence. He then procceded to get a cold beer out the refrigerator and go inside and watch tv. It took me forever to do the intake side, if you have the right extensions and u joints, its not too bad gettin the plugs in and out, but gettin those wires back on can be a real pain in the butt.