Rev Limit? - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

EBFAIRMONT3.9 · 05-22-2005, 21:08

Gday people ive discoverd something, My EB Series 1 I6 has a rev limiter is that a factory thing??? Its a fairmont but yea its limited at 5500 i had no idea they were limited

Ghia5L · 05-22-2005, 22:28

Interesting... I'd never thought about that. My 5.0 has a cutout of around 6200rpm I think, however I haven't been game enough to test that theory out!

Can anyone else confirm this 5500rpm cutout?

-Dave-

-jjM- · 05-22-2005, 22:35

i know ive been over 5500 before, id have to test it out more on a stretch or sumthing, quiet interesting thow

jonbays · 05-22-2005, 22:57

EF six will stop at 5700rpm on the rev limiter or cut out.

Tomek_Ghia · 05-23-2005, 03:54

have had my EL past 5500... im pretty sure, wasn't sounding to healthy so i backed off!

madmelon · 05-23-2005, 06:22

I always thoguht the limiter/cut out on the EA-ED engines was a little lower than 5500- somewhere around 5200. 6200 for the 5L sounds a bit high too.
All engines with an engine management computer should have a rev limiter/cutout. With carby engines you can rev them until the valves bounce and this essentially acts as a rev limiter (and feels roughly the same btw) but just because it can rev that high doesn't mean it was designed to. I've got a piston from a 351 Cleveland V8 in my bedroom...still attached to the snapped connecting rod. The piston has some nice dents in it in which (whats left of) the valve sits nicely in. Half the side of the piston is missign too. This guy has blown up 3 or 4 since last christmas because he disobeys the redline on his tacho and takes it past 7000 rpm.
The user manual says don't operate the cars in the red/orange zone of the tacho. I'm inclined to agree with this. Both times the EL has been into the red (all the way to 5700 by accident both times) it has sounded absolutely terrible and things start to vibrate in the dash. Imagine whats going on on the other side of all the dampening...

Ghia5L · 05-23-2005, 16:42

Well I have revved my 5.0 to 6000 (unintentionally) at the drags, due to damn shifter lag which I was still figuring out at the time (BA tiptronic shifter that I'd installed half a week earlier). Sounded a little thrashy at those revs, but no side effects...

The 5 litres are pretty revvy. Also, since mine is still asthmatic (E7 heads, HO intake) it gets rich because it can't breathe, so the last thing it'll do is lean out & go kaboom

-Dave-

ED I6 · 05-23-2005, 20:02

Quote:

Originally Posted by EBFAIRMONT3.9

Gday people ive discoverd something, My EB Series 1 I6 has a rev limiter is that a factory thing??? Its a fairmont but yea its limited at 5500 i had no idea they were limited

For the I6's
EA-ED have a 5400rpm limiter. EL's have a 5700rpm limiter.
Not sure about EF, I have been told only the tickford engines got the 5700rpm limiter.

madmelon · 05-24-2005, 18:12

EF and EL engines are almost identical. EF has a better balanced crank (more/different counterweights) and as such i'd expect it to have the same 5700 rev limiter.
I know that the 5L motors are much shorter stroke that the 6's and because of that they should be able to rev higher...but 6000 still seems way too high- the tacho stops at 6000. Perhaps the limiter was just about to catch it.

madmelon · 05-24-2005, 18:13

EF and EL engines are almost identical. EF has a better balanced crank (more/different counterweights) and as such i'd expect it to have the same 5700 rev limiter.
I know that the 5L motors are much shorter stroke that the 6's and because of that they should be able to rev higher...but 6000 still seems way too high- the tacho stops at 6000. Perhaps the limiter was just about to catch it. They also make maximum power at about 4500-5000 rpm. It would have dropped off enormously by 6000.