Spark plugs

[frank13]

Anybody got any info on swapping plugs(Denso Q20PR-U11) Out of a 1986 300ZX into an L24? I found a new almost brand new set of these Denso's in my stuff and finally through deduction and autozones computer figured they are for the VG30E. The main difference looking at them is the Hex is 5/8 instead of the 13/16 of the 240. Perhaps a tad bit shorter? As for heat range and the like I have not got a clue. But if possible I would like to throw them at my poor 240Z. Not just toss them out. Being that i recently just got her running again after two years. The plugs are all mismacthed from two different engines lying around. Being the hollidays no spare money for my baby's new plugs? Any sound reply's?:devious:

[kyteler]

My first reaction was, old motor vs. new motor, hell no... then I thought.. well... that's hardly a sound reply that he asked for. So I did some research, examined the denso website and cross referenced the data I found in the modify Nissan book.

The Denso plugs you have are equivalent to the NGK BCPR6, and the plugs you should be using should fall in the NGK B7ES B6ES and B5ES range with 5 being the hottest, theres also;

"Wide Gap - BP?ES-11" and

"Projected - BP?ES"

All of the above plugs also come with an ® option which stands for Resistor just to create less electrical interference.

Note: I had a whole lot more written then I decided to check the NGK site.

B = 14mm Thread

C = Hex Size 5/8"

P = Projected Insulator Type

R = Resistor

6 = Heat Range, which seams fine.

ES = Standard 3/4" Thread Reach (2.5mm) Centre Electrode

-11 = Gape range 1.1mm .044"

Here's the web addresses I used;

NGK Letter Explanation

DENSO Comparative Chart

DENSO Plug Specs List (look for IQ20 which is the Iridium Equiv. of the Q20)

That says the thread length of the Q20 plug is the same 19mm (3/4") as the NGK BCPR6

Up to you now. Going by spec sheets they should work, however, I probably still wouldn't and I shant take any responsibility for your choice or actions after reading the sources or my comments. (Disclaimer)

[frank13]

No that's information! Thank very much. For at the same time that I was wondering about using these plugs, I also got better info on the heat range and plug types. which I had been wondering about for much, much longer. Damn this place rocks!! . I only need them in there long enough to get her running right on both carbs. I not driving her on the street right now.(no plates). So I see it this way: I need to use anything from spare parts or borrrowed parts to get her ready to run with out blowing the motor. At the same time while I pay off everything that is preessing at the moment I can still work on my Z. When cash allows i'll know exactly what parts to spend one first. Or something to that effect.:devious: