nickz32

No “expertise” here, just enough experience to have learned logical testing is a better approach than a game of automotive pin the tail on the donkey :yes:

My point precisely..... you’re assuming it’s a boost leak because the OP has started by saying “I think I have a boost leak” and yet the symptom he has actually presented is a build up of crank case pressure that’s released when he opens the oil filler cap. Yes, a leaking pcv is a potential cause, as is a blown piston ring or cracked ring land.... So my point still stands, given the lack of other information (is it running rough, is it using oil, does it puff smoke on acceleration or deceleration, smoke on start up, general condition of the engine, mileage, increased boost levels etc etc etc), saying it IS the pcv valve is a bit of an assumption regardless of experience. While having a leak down test will prove or disprove an internal fault (and further establish the health of the engine) and then point the finger at the PCV’s.

From Hot Rod magazine: https://www.hotrod.com/articles/spark-plugs-tips/ Electrode and Gap Design When selecting the spark plug “nose” configuration, the simple rule to remember is: The more the spark plug is exposed to the air/fuel mixture, the easier it is to initiate combustion. Many specialized plugs have been developed for high-end race cars, but for most dual-purpose vehicles the choice typically boils down to either regular-gap (conventional) or projected-nose styles. The regular-gap plug is the traditional configuration factory-installed on many classic musclecars. For modern high-performance work, it should only be used if there isn’t enough clearance for a projected-nose plug. The latter style “projects” the spark further into the chamber than a standard plug, and will nearly always offer improved performance if there is sufficient valve and piston clearance, although many nitrous oxide users prefer to stay away from them because of excessive heat buildup in the tip that can cause detonation. Projected plugs initiate the flame-front closer to the center of the combustion chamber, which has an effect similar to advancing the timing. This lets the total ignition advance be reduced, decreasing the chances of detonation while providing superior throttle response. A projected plug’s longer core nose provides a hotter plug at low speed to help prevent fouling. As engine speed increases, the incoming air/fuel mixture flows across the core nose tip, providing charge cooling that effectively reduces the heat range for increased top-end detonation resistance. Today many race cars also used projected-nose plugs, albeit in highly modified form from the “civilian” versions—the ground electrodes are often cut back to help improve the flame kernel and reduce the voltage amount needed to fire the plug

Hmm. Interesting. Spark plug placement in the combustion chamber is quite a critical thing for flame fronts, so by pulling the plug further out of the combustion chamber you’re changing where the initial flame front is in the combustion process. I’m guessing there’s a reason why Nissan specified the plug protrudes that much more for the TT engine than the NA... From what I understood, you want the source of ignition to be as central in the combustion chamber as possible, so as protruding into the combustion chamber as possible without causing interference with the piston or valves It’s certainly something I’ll research further

I’d rather stick play doh through it [video=youtube_share;meXz_Ph5N50]

What’s the source of that picture Andrew?

Yes, the boss comes off when the bowls are machined This is a good read should anyone be interested https://www.dsportmag.com/the-tech/cylinder-head-101-getting-the-chambers-and-ports-in-shape/3/

You know what, I’m not sure. I’ll ask and report back

Isn’t that a rather large assumption given the lack of information?

That’s not a boost leak. That’s excess crank case pressure, so I’m guessing it also pops it’s dipstick out from time to time. Best take it to a garage for a leak down test

Well I have to say, I’m a little miffed! I had a message from EP Racing late last night asking if I was available for a video call.... never a good sign. Mitch had started stripping my heads down for them to have the valve guides on the intake side changed and CNC ported. I’d told Mitch that I’d previously had a CNC multi profile valve seat and throat machined when I changed to the SuoerTech valvetrain. For those who have heard of 3 angle and 5 angle valve seats cuts, a multi profile cut is a step above a 5 angle cut. when he removed my valves he was presented with this That is a 2 angle valve seat that’s been stone cut.... not CNC cut. To put some more meat on the bones, an standard stone valve seat cut costs roughly £85..... i was charged for my CNC valve seats £400. So, Mitch will be CNC cutting my valve seats when the CNC porting takes place, and should look like this I’ll be speaking to the machine shop that carried out my head work later this week to express my displeasure!

You’ll have to elaborate a little more than that I’m afraid...

However, this poll was only run for a week, vs the 2017 comp that was 3 weeks and only 46 or 48 voted. But I agree, I think it should be a blind poll.... I think the results will more accurately reflect what people actually like rather than being able to see the current poll standings and then make up their mind.

*held ....... god I’ve been waiting years to pick you up on a spelling mistake! :lol:

For some reason, when I try and look at Bird’s 99spec glass thread I’m getting this Only appears to be with this thread.

Wow...... For those of you who have kindly taken the time to read my Journal, you will all know how much of a roller coaster my ownership experience has been over the last 3 or so years. There has been more than a few times where I reached breaking point and was ready to give up on my vision of what I wanted my 300ZX to be. But because of this roller coaster ride I think have an even stronger bond with the car than ever before. It truely is part of the family. It feels somewhat strange for me to receive so many votes when so few people have seen my Z in the metal, especially when up against such well established and admired Z’s as Andrew and Gaz’s cars. I can only assume that I have managed to successfully convey the amount of blood, sweat, tears and sleepless nights (sad I know) that have gone into making my Z what it is today. I’d like to say well done to Gaz and Andrew for their closely fought contest. Both are fantastic cars that many owners aspire to transform their own cars to such standards. All I can say is Thank You to everyone who voted for my Z, I’m greatful beyond words. All being well I hope to get to some of the bigger meets this year, and hope that it lives up to the expectations that this competition has created. There are a number if truly fantastic Z’s in this club, and I shall endeavour to keep pushing the standard of my car to match those set by those cars... and hopefully compete against them again in the future. Finally, I’d like to give a special thank you to JoelyP. Joel encouraged me to rejoin the Club and show what I was doing with my Z and the direction I wanted to go. He also persuaded me to enter this competition, despite my reservations about so few people actually seeing my car (and it’s lack of engine). Cheers buddy! Nick

Let’s face it, we both know 90% of your post count is spam anyway LOL

Thanks dude! The rules in the competition voting says registered users can vote?

The importer should have declared your cars manufacture date as 1995 on your V5, that’s what is referred to for “vehicles first use” and what defines the age related number plate DVLA give you Car. Date of importation has no bearing on the emissions testing

So from my understanding, the law that required new vehicles to have a catalytic converter came into effect for U.K. market vehicles in Sept 1992. However there was a period of grace until August 1995 for manufacturers to make cars that were already in production to meet the new emissions regs. Theoretically, as the Z came with cat converters from the get go(QLDZDR, our cars also had cats as standard from 1989), it should have been subject to the cat emissions standards.... I can only guess that because U.K. sales stopped during that period of grace they simply never added it to the Annex sheet.... can’t say I’m complaining mind!

I’d completely forgotten Chris was doing dress up parts. Something to remember for the future!

Final day to reflect on 2018 and cast your vote

Because the Z was pulled from the U.K. market in 94, while all the others on the list were available after that. Can one of the admins make the VOSA link a sticky, as it’s a Q that regularly comes up.

Good stuff buddy

If you’re only in Wokingham mate, bring it over to Bone AS& Sons In Hook, they test my Z and are good as gold But print off those pages and carry them with you for MOT time... some testers have to be reminded of the standards our cars are subject to. (Bones should be fine though)