1 fast z

A raced prep crank and it still has the old press in plugs? Any competent builder would of had threaded plugs in there for cleaning.

After looking, if you had the pistons in corectly, they all broke on the NON pressure side of the piston.

Yea all on the pressure side of the piston is where the broke. HEAT is the only thing that would cause that much expansion. Heat from intake temps, detonation, pre-ignition, etc. I would DEFINITLY add an after cooler. Water injection would also help.

Well I am being told that since the z turbos dont have a 360 degree thrust washers, that they can withstand the pressure.

Ok, I am looking to upgrade, to some more correct turbos for my Twin turbo 3.1 liter DOHC L series. I am currently running 2 stock z car T3's with a .63 ar on the hot side. I am looking for something with a t3 flange. I am looking for something that I can run 30 psi through, and will still flow enough air. Anyone have any suggestions that dont cost a ton of money. Any advice is appreciated.

I vote for a shut down.

3d printing, A is not real cheap, and B only gets you a sample, trust me, casting is NOT cheap, as far as molds go, THEN thats really the easy part, the machining afterwards on a dohc 6 head is tons of work. We suspect the next head we build is about 10 hours of labor, from when we start the edm cutting.

Many of the people here have higher MPH on STREET DRIVEN cars, that is more impressive. Anyone can take cheater spray, and tons of boost and make a short lived motor, the guy who makes it last, and street driven is where the credit is given.

Tony, what was the mass of the pistons in the big boniville motor? You guys used press in pins, right? Double true arc's is what I uses to help against walk. The helix, is contributing more useless info to a TECH thread, its sourced in the properties of the picture, DUH, dude you are TOTALLY a freaking nut case man. On a side note I see in your profile with a gigantic turbo, you only run high 12's, slower then lots of NA cars on this site. Thats impressive keep up the good work.

Casting a dohc head would be a minumum of 10 times the effort then bolting them together.

Im using a L28 head and L28 block, also in one of my cars, but its not an L28.

Is it still an actuall L28?

A spring has one of the highest yeild points, a peice of anneled copper, has a LOW yeild point, like a solid copper head gasket. Sample graph Many metals follow Hooke’s Law until a certain level of stress has been applied, after which the material will distort more severely. The point at which straight line behaviour ceases is called the limit of proportionality: beyond this the material will not spring back to its original shape, and is said to exhibit some plastic behaviour. The stress at which the material starts to exhibit permanent deformation is called the elastic limit or yield point.

I hope to do mine on pump gas, with meth injection. SO I can have 700+ rwhp all the time. Should be around 28 PSI or so with my setup. Crossflow, and double the valves helps also, hehe.

Oh, I am thinking in the 700 rwhp range.

Yes, elasticiy, or YEILD as they call it in the metal world, is a big factor. That also triggers back to lighter piston, less recipicating mass, equels farther away from the yeild point of the material. I will be the one to test the rods, as it seems, no one is running stock rods in HIGH hp applications.

MASS IS THE ONLY VARIBLE, your freaking nuts man, Look up what a variable means PLEASE, DAMN.

Yea there is NO WAY no matter what is done with the stock AFM that off boost it runs well at all. I guess for an ugly drag car its cool, but for an all out machine, pretty haggard way of doing it.

What do I know right. Well Ive always been the one to think and do outside of the box, if not, we wouldnt even have a twin cam L series head to talk about in this dyno thread. But next time you go to the drags, take and put 1000lb's of lead in your spare tire well, and launch your car with 10 inch wide slicks at 8k RPM, lets see if your trans holds up. But untill then, I will be installing the Z32 transmission, as the Z32's were the heaviest of the z cars untill 96, so nissan but a bigger trans for a reason. Clifton and I were talking last night, were gonna go back to the dyno before the year is over, I will use the turbos one last time, and see what we get.

Where, am I talking about tires helix? I am talking MASS, thats always the varible I am talking about.

Yes, a shock load, if a roll is done, theres not much difference, thats why you break things on the line at the drag strip and not so much half track, although it can happen. Take a 2000lb z to the track with slicks, then take the same drivetrain with a 3000lb z to the track with slicks, you will be harsher on the 3000lb car off the line, and more likely to break the drivetrain. I am speaking from first hand experience fellaws. I dont just pull this stuff out of thin air.

It all goes back to F=MA. Less mass, less force, I want a scientific/mathmatical equation showing otherwise, untill them, I will create my own equation to show the difference.

Take and tie your car to a tree, and if you could have 4 wheel drive and 100% traction, then rev it to 10k and drop the clutch, this simulates if your car weighed TONS, see what happens. Then take that same car and un tie it. Less FORCE on the trans/diff/axles. Take a go kart with 500 hp, and all use a small dinky trans, will work fine. Take that same motor and trans, in a 10000 lb car, and see if that trans last.

No, I dissagree. If you make a car lighter, the DRIVETRAIN COMPONENTS ARE STRONGER, it IS the same as if a lighter piston is on a rod, it makes the rod stronger. You take a car that weighs 10,000 lbs, with 500 torque, and get sticky tires and launch, then take the SAME motor in a car that weighs 1000 lbs, the car that is ligther, will be less force on the drivetrain. Take a slege hammer, leave it on the ground, then with one arm, take it and as fast as you can swing it 360 degrees over your head. Then take a tack hammer and to the same thing. Post your results back when your done with the hammer testing.

I would be curious with the 50lb/hr injectors and stock ecu, on how well the daily driving is on it.