One of the fastest and fastest cars I ever owned was an 1985 Nissan 300ZX, t-tops 5-speed, the car would hit 145 maybe more but the rusted-out frame was so dangerous at those speeds. On the driver side visor when you would pull it down there was a warning that simply said do not race engine longer than 60 Seconds, why?
It was a non-turbo at only had 120 K miles, the motor was very well taken care of my question is why was this warning on the driver's visor
[This message has been edited by DanDamage (edited 11-23-2019).]
Originally posted by DanDamage: On the driver side visor when you would pull it down there was a warning that simply said do not race engine longer than 60 Seconds, why? ... my question is why was this warning on the driver's visor
Ooh ooh, I know. Pick me !
It's on the drivers side of the car ! They are in charge of operations.
It did not say to not race the car more than 60 seconds. My Dad has had many a nice high end vehicle. I wouldn't even think of racing the engine for more than ten seconds. Especially when 'cold', initial start up. Once, I lent him my chain saw (new) and he started it up cold, and raced the engine. I told him I will treat his cars that way, .
One of the fastest and fastest cars I ever owned was an 1985 Nissan 300ZX, t-tops 5-speed, the car would hit 145 maybe more but the rusted-out frame was so dangerous at those speeds. On the driver side visor when you would pull it down there was a warning that simply said do not race engine longer than 60 Seconds, why?
It was a non-turbo at only had 120 K miles, the motor was very well taken care of my question is why was this warning on the driver's visor
Very likely the Oil system won't make enough flow, pressure or both in some to all areas at WOT. That causes low pressure and bad crack rod and other bearings. IOW Same issues as "Fiero" V6. (Same engine is used on other GM models w/ same problems on bottom end.)
------------------ Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should. (Jurassic Park)
I wonder if it was a factory cooling issue, I remember the one time the temp spiked on me was having a revving battle at a stop light
Lol! "Was having a revving battle at a stop light..."! Neutral-drop! (I snapped the rear tail-housing off the transmission of my Chrysler New Yorker once...)
I miss being young!
[This message has been edited by Boondawg (edited 11-24-2019).]
I destroyed a powerglide with a max throttled 283 in a neutral drop 4 decades ago in podunk, Arkansas' only redlight. Not the tailshaft..the whole case...felt part of it hit the floorpan under my feet. Left chunks of steel and gears and a BIG pool of transmission fluid at the intersection too..about 3am...and about 100 miles from home. No worries. Salvage yard PGs were cheap and plentiful at the time.
... there was a warning that simply said do not race engine longer than 60 Seconds, why?
I believe "race the engine" is a British term for reving the engine. So they are saying not to rev (race) the engine to high RPMs when engine is not under load (driving) for obvious reasons.
I believe "race the engine" is a British term for reving the engine. So they are saying not to rev (race) the engine to high RPMs when engine is not under load (driving) for obvious reasons.
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Yep. There's usually a huge safety difference between max load rpm and max no load rpm. One of the issues I've seen in recip engines is that at high rpms, it's possible for the oil pump to move more oil up into the engine under pressure than can return to the sump at a fast enough rate for the pump to pick it back up. Results in oil pump cavitation. Applies to everything from gasoline engines, elec motors, gas turbines and especially....diesels.
I observed a catastrophic failure of both a Waukeshau L-1616 diesel engine and an old White Superior in-line 8 cyl. The Waukeshau ran away when the governor failed in WOT at startup and the Superior ran away when one of the unit injectors stuck in full fuel position. Both blew a cyl head off but the real damage came from all the oil being on the top end of the engine and all crankshaft related bearings seized and turned in their saddles, ruining the crankshafts and blocks. Engines were scrapped.
"Observed" is a bit of a misnomer. It scared the crap out of me at the time.
[This message has been edited by maryjane (edited 11-25-2019).]
Yep. There's usually a huge safety difference between max load rpm and max no load rpm. One of the issues I've seen in recip engines is that at high rpms, it's possible for the oil pump to move more oil up into the engine under pressure than can return to the sump at a fast enough rate for the pump to pick it back up. Results in oil pump cavitation. Applies to everything from gasoline engines, elec motors, gas turbines and especially....diesels.
Agreed. I know people have experienced what you describe when they installed a high volume pump without a larger volume oil pan on the engine.
I'm still pretty sure that if the oil level is at correct level and people aren't going over Red Line on the tach, they should be OK with a completely stock engine unless someone messed up on calculations somewhere.
Sitting in the driveway and "racing the engine", "gunning the engine" or "rev-ing the piss out of it" is the damage Nissan was warning against.
[This message has been edited by fierosound (edited 11-25-2019).]
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