it's ~10 degrees out and has been been snowing on and off for weeks - car is inside and staying there for the forseeable future. I've driven it twice in the last 8 weeks

The Ohlibs are without question the best setup I've used to date on these cars. Awide range of height adjustment, zero noise, very meaningful dampening adjustments. No other coilover I've used has impressed me as much in the last 7 years. My previous HKS RS will be up for sale soon.

 

thanks for the response. well hopefully you get the same weather as we have soon you could do a bit of testing and review on the new set up. pros, cons, specs etc.

 

not quite sure what other details you are after - the pros are as I've described. The only con is the price, as they are expensive. Spec wise, what specs are you after?

 

Hey Adam I'm curious how many miles have you driven with this motor so far? How often do you take it to redline? Any concerns as far as reliability of the motor itself?

 

approximately 18,000 miles since July 2007

Often - it makes power to cleanly to redline, and since it was built to be at, and sustain the higher rpms, there is no real reason not to take it there. Of course I don't spend the time driving in the car racing up to redline, but it's taken up there all the time.

at this point, none, since it's not new and has proven reliable, though there are never any guarantees - at the end of the day, it's just a machine, and machines can break

 

Thanks for the reply.

After reading about someone on the maxima forum havin their oil pump shatter revving upto 8k+ with a stock bottom end I was a little concerned.

 

A stock oil pump is designed for stock revs (or slightly higher) on a stock bottom end. The components Nissan uses, the way Nissan balances stock components, and the revs they are balanced to, is alot difference than the same components and tolerances you assemble a built motor to. Proper clearances for bearings, balancing of all rotating components, etc etc is crucial if the engine is to survive high rpm use in the long term. Nothing special about my oil pump - just a standard revup. You could put the worlds greatest oil pump on an otherwise stock engine, and the vibrations that the stock engine produce at 8000 rpm (where it was never designed to rev), could just as easily trash that bad-*** pump. Everything has to be designed/assembled to work as a unit, no single part will save an engine from itself if you are using it in an environment beyond it's capabilities.

 

Good testament for my now >30,000km DE oil pump still "knock on wood" hanging in there with the Cosworth set-up!

 

I am going with BC stage 1 cams, Supertech dual valve springs on my 88mm BC crank with BC rods and 96.5mm 11.0.1 JE pistons.

I am looking for input now on the right head gasket bore and oil pump to use.

Some say use 98mm HG, some say get a custom 96.5.

Any input would be gratefully accepted.

 

98mm would be good. A good engine builder would take a 96mm head gasket and slightly enlarge the bore. This way in the combustion chamber the headgasket doesn't heat up and cause pre detonation.

 

I have a 96mm Cosworth head gasket set. We added a bigger water cooler and a oil cooler with catch can when doing my mental build. There must be an increase in compression from 98 to 96mm so more heat. It never get's even close to what the original oil and water temp gauged (new analog) DE engine ran at now so this may help to some extent if you tighten the gap. If I'm wrong on this, please anyone?

 

I thought a .5 mm oversize was the appropriate HG size. So your 96.5 pistons would ideally go with a 97mm HG, but I don't think I've ever seen that size out there. I have seen a few 96.5's but I don't know whether they can take an overbore of the gasket. Also note, some people have matched the HG to the piston bore and been ok, e.g. 96.5mm pistons and 96.5mm HG. I think this would depend more on the piston itself though.

**Correction Z-1 Performance sells a 97mm from HKS, but has a thickness of .7. See if the numbers work out for your project.

 

I called Z1, told them what I was doing/what parts I was using and they ordered me a 97.5mm oem thickness Cometic gaskets for my 10k block/heads.

Thanks!

 

Those cams sound mild for that displacement, and you're reducing your power potential by bringing down your rpm ceiling.

 

But any more on the cams and I'll have driveability issues no? This is a daily.

The cams are what was recommended by BC (theirs)

As far as the rpm you mean the springs?

Thanks

 

I think what he is referring to, is he thinks your cam choice is too conservative. Personally I think the parts you mentioned will be ok and likely able to make decent power with a 7500 RPM redline. Becareful with the redline though, strokers don't like rev's as much as a OEM stroke. Higher piston speeds = trouble if pushed too far. And by using a more aggressive cam you will find yourself pushing the piston speed close to 24 m/s (which is race car like) to extract all the power available. As for springs thats a whole other thread, which wouldn't be a bad idea for your intended build up.

 

The DE , Revup & Nismo pump are all the same pumps except for the vane
The DE was known to shatter at sustained high revs & was rectified when the revup was released.
The Nismo pumps uses a higher grade of steel in the vane & possibly different pressure spring than stock

 

Awesome info. Thanks.

 

Cams essentially become less aggressive with more displacement.

 

What's up Adam....do you know if the Crawford headers fit 06-08 Z's I remember reading that they didn't fit the 06-08 Z's because the steering linkage was changed that year. I called Crawford and who ever answered the phone said they fit,but some of the people at these company's answering the phones don't really know so I'm coming to the expert.