Whats that squeal @ 6500+ RPM?

[Kiven422]

On my 94 Q45 I can hear the engine squeal after I pass 6500 RPMs. I'm pretty sure its one of the belts. The belts have been replaced less than 35,000 miles ago (I have all records). The belts are tightly fit and do NOT squeal at all unless I pass 6700 RPM.

I don't know why it does this. The engine needs to be resealed but other than that it is mechanically sound. It has done this since I bought the car 1 year ago.

Any thoughts?

[maxnix]

Improper belt or belt tension, or more likely, failing pulley bearing, or all of the above.

[elwesso]

If its been 30k miles its time.. I like to replace my belts every 3 years.

[Kiven422]

I have inspected the pulley and bearings, they all seem to be in great working condition.

The previous owner only drove 1000 miles on the new belts... I put the other 30k and I have had no problems other than replacing the starter.

It seems like the crank is spinning too fast for the other stuff connected to it... I guess that could mean one of the bearings are bad.

[maxnix]

Anything less than perfect will produce noise.

[xerexabante]

I would not rev and engine that is 14 years old at 6700 rpm at least not over 3 sec anyway.

[Q451990]

I would not rev and engine that is 14 years old at 6700 rpm at least not over 3 sec anyway.

Redline keeps the carbon down...

Q45Tech has been doing it daily for over 300K and 18 years! Guess it depends on the maintenence history.

As for the squeal, my bet is idler pullies... Listen for a quick squeal at startup, especially on cold mornings.

Heath

[xerexabante]

6700 rpm to get carbon out just might lock, spin a bearing or a rod on your engine. I would rather have an engine with carbon than a locked up motor to get rid of carbon. I would go 4000rpm at maximum time of 1:30 mins to get carbon out.

Anyway that is me, people can do anything to their cars.

[Jesda]

A ten year old car is worth so little, it can't hurt to have fun.

I revved the piss out of my 92 at every opportunity, but stayed on top of belts, pulleys, and especially oil. Its still being driven by someone in California with 230k now.

[maxnix]

I would not rev and engine that is 14 years old at 6700 rpm at least not over 3 sec anyway.

Big difference between VH and VK series, and almost any other V8. VH is tremendously overengineered and understressed. It can live at redline if properly maintained for a long time and still go 350K.

[Kiven422]

I would not rev and engine that is 14 years old at 6700 rpm at least not over 3 sec anyway.

You are way too late for that. I used to average 120MPH to work and back. Interstate 5 is usually clear for a graveyard shift. 120MPH = 3500RPM not bad

But come to think of it.... I have never hit the rev limiter, i wonder what happens

but anyways, no squeals at start, like it said it does not ever squeal except at 6500+ RPM

I've had an idler pulley go out on me before and this is not the case... i have to take another thorough look

[xerexabante]

Big difference between VH and VK series, and almost any other V8. VH is tremendously overengineered and understressed. It can live at redline if properly maintained for a long time and still go 350K.

I do know my engines! My car and I will do what I do. Let's see you rev your engine 6700rpm for 4 mins.

[xerexabante]

A ten year old car is worth so little, it can't hurt to have fun.

I revved the piss out of my 92 at every opportunity, but stayed on top of belts, pulleys, and especially oil. Its still being driven by someone in California with 230k now.

LOL. I saw one here listed for $1500 95 Q45 pristine. I called the owner and he responded. Wanted to see if it was legit.

[maxnix]

Let's see you rev your engine 6700rpm for 4 mins.

Sure! Come on down! We might be better off to meet in W Texas.

I would not rev and engine that is 14 years old at 6700 rpm at least not over 3 sec anyway.

So which is it? Doesn't really matter to a VH45DE. Just have to find the road.

[Infinitiguy19]

Ur not serious are you?

Next thread we see from you God forbid is (My engine is blown) might not happen right away but soon, You never know.

You can never have all service history UNLESS you were the first one to drive it when it rolled out the factory and changed the oil every 2500 miles and did meticulous work to the car.

[jimbyjimb]

My bet is a VH45 can rev much higher than factory spec. That spec isn't for the engine, it's for the transmission input shaft. That little 4.5 is all forged, six bolt mains and DOHC, it can rev it's heart out with no problems. I see guys rev their crappy 5.0's well past factory redline with over 180k with stock cast bottom ends and those still make it past 200k. The VH will handle alot more than was spec'd for it. One of the reasons it is such a quality machine. I haven't heard of one thrown rod since I've been here. Stiffen the follower springs and forge the transmission input and you'd have one nasty little screamer.

[xerexabante]

Well let's bring it on.

Who wants to see Manix rev his motor at 6700rpm for 4 mins?

Let us know when.

[jimbyjimb]

I'd like to see you both rev in unison, a sort of F50/G50 comparison. Maybe chaulk the fronts and do a dual redline burnout like at a redneck car show. Hell, I'd lower my standards and drink a Bud to see that happen. We could even grab a couple cheap hookers for a mudwrestling match. Also refer to every kind of limited slip as a "Posi", cook on an oil barrel converted to a grill and have the Hell's Angels pop in for a quick brawl. My journey toward the Dark Side will be complete...

[goody90q45]

My bet is a VH45 can rev much higher than factory spec. That spec isn't for the engine, it's for the transmission input shaft. That little 4.5 is all forged, six bolt mains and DOHC, it can rev it's heart out with no problems......The VH will handle alot more than was spec'd for it. One of the reasons it is such a quality machine.

Was this engine ever used in a racing series by Nissan or Infiniti? How did it perform? I think I remember seeing Infiniti doing something for a couple of years with the VH45 (Indy car?).

[maxnix]

Yeah, they had a V8 based on the VK, I believe, but heavily modified. The VH was used in their dominating prototype that won LeMans in the early 1990's.

[Infinitiguy19]

I'd like to see you both rev in unison, a sort of F50/G50 comparison. Maybe chaulk the fronts and do a dual redline burnout like at a redneck car show. Hell, I'd lower my standards and drink a Bud to see that happen. We could even grab a couple cheap hookers for a mudwrestling match. Also refer to every kind of limited slip as a "Posi", cook on an oil barrel converted to a grill and have the Hell's Angels pop in for a quick brawl. My journey toward the Dark Side will be complete...

Yeee haaw, Now that's a party.
Modified by ppastos at 7:40 PM 10/4/2008

[xerexabante]

i will not do the show down with Manix. His proposal was his car reving at 6700rpm for 4 mins.

So Manix when do you want me to come down and witness this? Let me know maybe more people want to see this.

[Infinitiguy19]

i will not do the show down with Manix. His proposal was his car reving at 6700rpm for 4 mins.

So Manix when do you want me to come down and witness this? Let me know maybe more people want to see this.

I thought that's what you wanted though?

Remember we want video.

[jimbyjimb]

It actually wasn't HIS proposal, but while we're at it I think it's just too damn easy to simply rev the car. There has to be something else, like encircling the car in raw crude and lighting it, then revving. Or, paint the car red, white and blue and do it on the Fourth with an entire display timed in unison with the rise in rpm as the throttle is depressed. Maybe even Apollo will get back in the ring and die to the Russian all over again. Sigh. The perfect day...

[xerexabante]

Mainx said that he will bing it on. As you can see he has not responded to this topic about his dare.

So Manix let me know I will fly out there to witness this.

[paranoidjack]

On my 94 Q45 I can hear the engine squeal after I pass 6500 RPMs. I'm pretty sure its one of the belts. The belts have been replaced less than 35,000 miles ago (I have all records). The belts are tightly fit and do NOT squeal at all unless I pass 6700 RPM.

I don't know why it does this. The engine needs to be resealed but other than that it is mechanically sound. It has done this since I bought the car 1 year ago.

Any thoughts?

Kiven, 6700? You sure that's not the tires breaking from the road?