M20b23 noise above 2k RPM

[Gruelius]

http://users.tpg.com.au/adsljj8m/25052010_track2.mp3

first rev is in car second rev is outside of the car, was inside my garage

anyone know what is is?

When i did the valves I set it to sort of have a slight feel of paper dragging against paper at .01" then i tried putting in a .012" to make sure that it was tight enough, if the .012" didnt fit in i called it a day for that valve. When i had it tighter( i had it feeling tight at .01 and didnt try to fit a .012" the first time) it was MUCH louder.

ATM im using 20w-50 gtx 2, ill check the oil level actually and ill have a look at how gritty it is. It was running with a blocked FPR before so the oil was a bit diluted (i did an oil change once i fixed the FPR).

could it be knock? i heard the paintball sound once on a hot day up a hill with 91 octane (lowest one here) so ive been using 98. the dizzy is fully wound advanced.

I also tried having the car in gear and just turning the car off and id still get the rattling noise.

And how often should i change spark plugs?

[joonsup]

sounds like rod knock to me. my old e30 had that same noise and when i took it to my friend's shop, he used those stethoscope to listen and it was knock coming from the 6th cylinder.

[Kershaw]

you guys get 98 as pump gas?

wtf. jealous.

[lennon]

you guys get 98 as pump gas?

wtf. jealous.

you must be dumb

[Sagaris]

The US uses the AKI octane rating method , other countries use RON or MON. The 98 is probably RON which is comparable to 89 octane here in McDonald's-land.

If the engine is in good condition, Change the plugs every 30k miles or so. If you have any running problems (too rich, too lean) then you will want to replace them after you get the problems sorted out. Platinum plugs have a longer change interval but are not a recommended choice for our engines (or most any older ignition systems)