FLY BY Z

Thanks!

I was just wondering what you had to say. I know that unless a dealer/Nissan has undeniable and hard proof they WILL NOT deny your warranty. Let me repeat that you almost have to try to get your warranty denied with Nissan. With that said, you probably don't agree, but I was asking because the dealer or NNA is bound to have something that makes their case open and shut (otherwise you would have a new engine). Do you know what that might be?

rocks

iTrader: (1)

Aftermarket modifactions caused a lean condition wich caused a piston to shatter??? Thats thier case.. Go figure. Nissan techs suck. They dont even do actuall mechanical work. When they put a engine it, its a longblock fully timed they just bolt it in and hook up the wire harness its all plug and play.

FLY BY Z

Nissan techs don't rebuild engines, transmissions, and most differentials because Nissan only sells the whole assemblies. Your pictures do not indicate a shattered piston being the problem.

By the way, there are several Nissan/Infiniti techs on this website that would beg to differ on whether they do real mechanical work. They are more trained than a general mechanic and even the guys building your engine. Those guys can take apart and reassemble your engine. Nissan techs work on the whole car. That's beside the point.

Anyways, I'm glad you got a built engine. Now get a turbo on it so it will be fun!

And don't listen to those guys telling you your car has less power than a stock VQ just because it has 9:1 compression. I have a Chevy 327 engine that makes 550 HP with 7.5:1 compression. And it's naturally aspirated.

rocks

iTrader: (1)

lol yea i think its funny that they think i lost 50hp due to a little compression drop. If anything its maybe 3hp at the wheels haha.

Old School

iTrader: (28)

Isn't it hilarious!!??....we must pull this info from our butts!!! I pulled this info straight from howstuffworks.com. These are very elementary explainations, but you get the idea. Get rid of the other variables (i.e. cams and other mods) and just drop compression.....then dyno and post results. My civic had 9.2:1 compression stock, and ran great....we're not saying its sluggish, you just loose a few ponies...that's all.


Producing More Power, Engine Questions
Horsepower
For a complete explanation of what horsepower is and what horsepower means, check out How Horsepower Works!

Using all of this information, you can begin to see that there are lots of different ways to make an engine perform better. Car manufacturers are constantly playing with all of the following variables to make an engine more powerful and/or more fuel efficient.

Increase displacement - More displacement means more power because you can burn more gas during each revolution of the engine. You can increase displacement by making the cylinders bigger or by adding more cylinders. Twelve cylinders seems to be the practical limit.

Increase the compression ratio - Higher compression ratios produce more power, up to a point. The more you compress the air/fuel mixture, however, the more likely it is to spontaneously burst into flame (before the spark plug ignites it). Higher-octane gasolines prevent this sort of early combustion. That is why high-performance cars generally need high-octane gasoline -- their engines are using higher compression ratios to get more power.

Stuff more into each cylinder - If you can cram more air (and therefore fuel) into a cylinder of a given size, you can get more power from the cylinder (in the same way that you would by increasing the size of the cylinder). Turbochargers and superchargers pressurize the incoming air to effectively cram more air into a cylinder. See How Turbochargers Work for details.

Cool the incoming air - Compressing air raises its temperature. However, you would like to have the coolest air possible in the cylinder because the hotter the air is, the less it will expand when combustion takes place. Therefore, many turbocharged and supercharged cars have an intercooler. An intercooler is a special radiator through which the compressed air passes to cool it off before it enters the cylinder. See How Car Cooling Systems Work for details.

Let air come in more easily - As a piston moves down in the intake stroke, air resistance can rob power from the engine. Air resistance can be lessened dramatically by putting two intake valves in each cylinder. Some newer cars are also using polished intake manifolds to eliminate air resistance there. Bigger air filters can also improve air flow.

Let exhaust exit more easily - If air resistance makes it hard for exhaust to exit a cylinder, it robs the engine of power. Air resistance can be lessened by adding a second exhaust valve to each cylinder (a car with two intake and two exhaust valves has four valves per cylinder, which improves performance -- when you hear a car ad tell you the car has four cylinders and 16 valves, what the ad is saying is that the engine has four valves per cylinder). If the exhaust pipe is too small or the muffler has a lot of air resistance, this can cause back-pressure, which has the same effect. High-performance exhaust systems use headers, big tail pipes and free-flowing mufflers to eliminate back-pressure in the exhaust system. When you hear that a car has "dual exhaust," the goal is to improve the flow of exhaust by having two exhaust pipes instead of one.

Make everything lighter - Lightweight parts help the engine perform better. Each time a piston changes direction, it uses up energy to stop the travel in one direction and start it in another. The lighter the piston, the less energy it takes.

Inject the fuel - Fuel injection allows very precise metering of fuel to each cylinder. This improves performance and fuel economy. See How Fuel Injection Systems Work for details.

rocks

iTrader: (1)

Well i also have increased displacement due to it being bored out haha. but yea people have posted that it was going to be a dog and be sluggish.

Old School

iTrader: (28)

haha...that's right. Put some spray on that bad boy while you save for turbo!

rocks

iTrader: (1)

I have been looking for used nitrous kits, think im going to run a 150shot on it. I need a limited slip first though. Last time i went to the track with it stock i couldnt get any traction so it ran a 15.0 launching at 1k rpms lol.

Old School

iTrader: (28)

I'd do a search and find some guys with open diffs that run. They might be able to help you with your launch. I've seen some damn good time slips from guys with open diffs. It'd be worth a look IMO. You have management already right? You're gonna need to pull some timing for 150 shot. Lots of fun though....the instant torque will make your butt grab the seat real tight. lol.

rocks

iTrader: (1)

No engine managment yet. Im planning on using the haltech interceptor. Im pretty much broke at the moment though. I go out of town to much.

dave3529

hey, did u hear anything different before it went like knocking or slap or did it just go all at once?

rocks

iTrader: (1)

It just locked up. Not tapping, no knocking, nothing. Retainer ring came off of the wrist pin, piston was destroyed by the rod, rod was still attached to the crank and the small end was crushed and split and wedged into the block. It also knocked all the oil squiters off. Destroyed the block. The piston pushed a sparkplug out of one of the heads.

doskiez

GOOOO that doesnt look good at all. At least it wasnt a piston through the side

JETPILOT

iTrader: (51)

Who needs a lawyer!!!! This is a case for small claims court.

JET

flynbrin

iTrader: (29)

im not a mechanic but i think its bad

Q45tech

Guess we have different ways of dealing with dealers.

When I have new cars, I take the SM out to lunch to discuss what he thinks is best mainteance etc, etc, etc.
Let him take credit for and get some of bonus from selling me an extended warranty.
Stop by at Christmas with a bottle or two. Say high every 90 days at oil changes.

Hard to be bad to your friends.

Try to make friends and influence people in advance since cars are $30-$60k expenses.