Today at Atelier Kaz - ex-Honda R&D, F1, Indy/CART engineer

I really wanted to change my Eng oil and filter last December but the service on one NSX took nearly 3 months that
the lift only just became available for my use but only for a day as another NSX is already waiting to be serviced.








Quick eng oil and filter change. Nothing special here.....








And over the last 23 years, I kept taking the compression once a year including when the engine was new and
always impressed with almost exactly the same tendency between each cylinder data.

The absolute figure means not much unless you have problem because it will be different depending on
eng temperature, altitude, cranking speed, equipment used, eng oil used, etc, etc.
The deviation between each cyl is the key.

[psi]
#1: 221, #2: 229, #3: 227,
#4: 225, #5: 230, #6: 230

It's my NSX so don't mind showing the data.
Very impressed with not much changes over the 154K miles total mileage.








The spark plug.
For this spec, it meant to be replaced at much earlier stage (12K miles) but I kept using it as I didn't see any wear at the GND terminal and
no hesitation or changes in A/F and I keep at least 1set of spare spark plugs any way.

The red colour at the centre insulator is very likely to be from the Shell Vpower Nitro+ fuel or whatever it's called these days.
With the help of my friends, we carried out spectral fuel analysis on standard pump fuel on different brands and based on this,
I always use the Shell Vpower+ and even use the same fuel station if at all possible.









Already covered just over 50K miles and for the first time, I can see tiny amount of rust instead of usual corona arch marking on the #3 spark plug
so decided to change all six this time.








Going back to standard NGK PFR6G-11 as there was no gain for using Iridium type on NA engine with ordinary compression ratio.

Should be good for 60K miles although it all depends on how well the rear bank IG coil cover seal is working.
Quite often, addition to the corona arching marking, I start seeing build up of rust even from around 30K - 40K miles if the seal gets tired.








Still very healthy seals at the IG coil covers.
Applied silicone grease again.








Quick Health Check on the lift, nothing wrong so back to work then.
My speedo and odo/trip meters are still in Km unit so it's just about 154K miles.


Kaz