What are the hazards in reving a 1FZ

[Azca]

I tend to drive an off road vehicle pretty hard except, I don't like to rev the engine if at all possible. 3,500 RPM is about as far as I want to push it for fear of either failure or significant engine wear.

Understanding Mr. T also purposely drops the red line on his equipment to help promote reliability I still have a problem in pushing it above my self proclaimed red line. I do hit 4k from time to time when I get the opportunity to pass (usually a VW bus) climbing hills on the freeway or getting on the freeway and wanted to know if I am being overly cautious for no reason.

I try to maintain my vehicles, use Mobil 1, change oil at no more than 5k miles, use synthetic fluids everywhere and more or less try to baby the trans and engine. I tend to use (some say abuse) the rest of the rig. This one has 180 K on it and does drink oil, I am guessing a quart every 1500 miles or so right now.

So am I paranoid, is it a good practice or as long if I let her have her head and just not let her run past 4.5 K is it OK? And if so, how long? I run between Flag and Phoenix a bit and we have a two long 7% grades that are between towns (each about 2k in elevation changes) with a total change of about 6,000 feet. Oh I tow a "loaded" tent trailer as well...

 

[tomcat]

Mine is an auto and i drive it like i stole it, 460,00km's only done the HG.

 

[Paul_L]

I think you're being way too conservative. Max HP is at 4600 rpm according to this page.

http://www.brian894x4.com/1FZFEspecifications.html

 

[quasi]

i would think you are fine. twin cam, and multi valve engines are designed to rev. I realize it's a forklift motor, but it revs up quite nicely. the valves need to turn on their seats, which is easier done when revved up, and you may clear a bit of carbon as well. reving up an unloaded motor in nuetral is another story, that's never good

 

[scottryana]

It is also an oversquare motor 100mmx95mm


An oversquare engine allows for more and larger valves in the head of the cylinder, lower friction losses (due to the reduced distance travelled during each engine rotation) and lower crank stress (due to the lower peak piston speed relative to engine speed). Due to the increased piston- and head surface area, the heat loss increases as the bore/stroke-ratio is increased excessively. Because these characteristics favor higher engine speeds, oversquare engines are often tuned to develop peak torque at a relatively high speed.

 

[Pin_Head]

It has a 7 main crank. Rev the $hit out of it.

 

[mr jits]

Creepersleeper used to bang his off the rev limiter. Go for broke!

 

[86tuning]

I happen to work with old 1980s Toyota engines that happily rev to 7500 rpms all day long. I don't have any issues revving engines to redline during acceleration. I just don't like sustaining those revs for prolonged periods.

If you don't rev to 4500 rpms you're not using all the power that the engine came with.

I'll bet you're more shy due to perceived fuel usage when you drive it hard because that's what stops me from driving it hard all the time. Gas up here is over $5.50/gal

 

[98 SNAKE EATER]

It has a 7 main crank. Rev the $hit out of it.

THIS!!

I was bouncing off the limiter while making my way up a few dunes the other day without a care in the world

333,xxx miles on the original HG

 

[timer00]

THIS!!

I was bouncing off the limiter while making my way up a few dunes the other day without a care in the world

333,xxx miles on the original HG

You stink I just found out my HG is faulty at 121k

Though before my recently external HG leak on vacations and such I have reved it up to the redline probably a few dozen times haha

 

[scottryana]

Oh I did 83 dyno pulls from idle to redline in 2 days, under boost..... lol.

 

[ChaseTruck]

Threads like this one, together with the endearing overheating and HG discussions have me wonder whether purchasing an FZJ80 was such a great idea...

I mean, what's next? Oil analysis required every time the motor went over 3,000 rpm and/or 190°F?

 

[timer00]

Threads like this one, together with the endearing overheating and HG discussions have me wonder whether purchasing an FZJ80 was such a great idea...

I mean, what's next? Oil analysis required every time the motor went over 3,000 rpm and/or 190°F?

I got up to 212 in 95 degrees idling in a drive thru with A/C full blast.. time for a new engine

 

[mandinga]

I s*** in my intake and put sand in the crank case, then head out for street racing you should be ok with what your doing, probably just need to clean out your p*ssy a bit.

 

[DSRTRDR]

Oh I did 83 dyno pulls from idle to redline in 2 days, under boost..... lol.

good to know

 

[95ToyCruiser]

I beat mine relentlessly, I've got 260k on it and bounce it off the rev limiter all the time, while wheeling I'll run it at 5,000+ RPMs for extended periods if climbing a hill...

We don't have the advantage of tons of power down low (or anywhere for that matter) so you gotta use all that it has to offer.

That being said, I never worry about the motor, these things are built like a brick s*** house....

The red line is there for a reason, anything below that is fine for the motor...

 

[Azca]

Thanks all, I knew what the chassis would take, and that these things are built to survive a scud strike but unsure how/what to expect with reving them. What effect, if any, will it have on the HG?

No not paranoid, just not informed...

 

[Azca]

I got up to 212 in 95 degrees idling in a drive thru with A/C full blast.. time for a new engine

Not sure about overheating (although I am relying on the dash gauge) I left mine idle in the heat, in the sun for about an hour the other day when it was over 112. Didn't seem to budge. My cooling system seems to work j u s t F i n e!

 

[BrotherRob]

Threads like this one, together with the endearing overheating and HG discussions have me wonder whether purchasing an FZJ80 was such a great idea...

I mean, what's next? Oil analysis required every time the motor went over 3,000 rpm and/or 190°F?

Duh

 

[Tapage]

about red lines .. when exactly you guys have rev limit ?

I used to see it close to 6K on those Venezuelan 1FZ-FE and trust me they hit it pretty often !