5k Scare BOOOOOOM

[RichRSi]

Driving today (in the rain) finally get onto a stretch of road and put my foot down to accelerate, get to about 5000rpm and it sounded like the worlds largest and loudest Tuba was played at full volume in my car untill about 5500rpm and it died off completly, (it did this in every gear) it basicly sounded like I had a really loud exhaust for a second! It even hurt my ears as I wasnt expecting that at all!

There was no change to the performance through the gears. The car is 100% standard, also I havent been over 4000 rpm in months... So What could this be?

As it is rev related does it have something to do with the exhaust / cat passing gas at this frequency and making it vibrate? I hope the exhaust isnt buggered as it is totally quiet at all other revs and passed the emissions test fine 6 months ago.

 

[davebem]

It could be the exhaust or a weak join. Have a look where the cat joins the manifold.

 

[RichRSi]

Thanks for the reply Dave.

I'll have a look.

I don't usually get a chance to open the car up as most of the roads I use regulary are in 30 zones and it wouldnt be safe to get upto 5k in any gear. so it came as a right shock, it was like a ship sounding a fog horn in the car!

 

[brisa4984]

somthing is loose and resonating..

physics is so kool

 

[172.com]

Going to show my complete and utter ignorance here, but for me there is a distinct 5k kick, which has got something to do with variable valves or some shizzle I think. Maybe there's an issue when that kicks in?

Edit: You don't have a 172 so maybe that's not the case in your case :S