Rev in Red zone

Matt · 10-25-2009, 09:06 PM

engine harshness at high revs

If anyone is interested, I found the answer to my own question in that thread.

Is something that we have to live with or does it get better with a few thousand miles on the engine? I'm not sure I'll ever get into the 6k range again to avoid this harshness, unless it's absolutely normal and harmless.

nuts4nissan09 · 11-29-2009, 02:13 PM

Quote:

Originally Posted by Matt

engine harshness at high revs

If anyone is interested, I found the answer to my own question in that thread.

Is something that we have to live with or does it get better with a few thousand miles on the engine? I'm not sure I'll ever get into the 6k range again to avoid this harshness, unless it's absolutely normal and harmless.

I have around 8,500miles on mine. I drive mostly on the backroads and frequently accelerate hard. The harshness everyone is talking about is still there, but is much less than it was @ break-in (2,000 miles). Use a quality synthetic and have fun with the car. These VQ's age well (take a while to really break-in).

davidyan · 12-02-2009, 09:46 PM

An interference engine is one in which if the timing belt breaks, and the valves come fully down, they don't come down far enough to make contact with the piston, thus saving your engine. Typically, an interference engine results in lower compression so its not likely that the Z has it. Again its designed for when the belt / chain breaks not so much for when the valves completely float due to overreving, so it may only be of minimal help in that case. But, if you haven't noticed any rough idle by now you should probably be fine.

I come from a Toyota Celica GT-S (2000) before the Z and many people used to misshift that car all the time due to the tight gearbox and ended up blowing their engines. It got so bad, Toyota actually replaced most of the engines under warranty. Some people were out of luck if they went to a tough dealership to get it fixed.

10-25-2009, 09:06 PM	#1 (permalink)
Matt A True Z Fanatic Join Date: Oct 2009 Location: Augusta, GA Age: 43 Posts: 1,680 Drives: 2010 Avalanche LT Rep Power: 20	engine harshness at high revs If anyone is interested, I found the answer to my own question in that thread. Is something that we have to live with or does it get better with a few thousand miles on the engine? I'm not sure I'll ever get into the 6k range again to avoid this harshness, unless it's absolutely normal and harmless.

12-02-2009, 09:46 PM	#3 (permalink)
davidyan Base Member Join Date: Jun 2009 Location: CA Posts: 244 Drives: PG 370Z Sport 6MT Rep Power: 17	An interference engine is one in which if the timing belt breaks, and the valves come fully down, they don't come down far enough to make contact with the piston, thus saving your engine. Typically, an interference engine results in lower compression so its not likely that the Z has it. Again its designed for when the belt / chain breaks not so much for when the valves completely float due to overreving, so it may only be of minimal help in that case. But, if you haven't noticed any rough idle by now you should probably be fine. I come from a Toyota Celica GT-S (2000) before the Z and many people used to misshift that car all the time due to the tight gearbox and ended up blowing their engines. It got so bad, Toyota actually replaced most of the engines under warranty. Some people were out of luck if they went to a tough dealership to get it fixed.