Spark plugs Options

[ruddyboys]

Have to change spark plugs this weekend. I went to 3 FLAP and none of them carry Bosch W7CC. They have the usual AC Deelco, NGK, champion etc. Are any of these any good or should I stick to the Bosch? If Bosch is the best bet, who has the best price and shipping?
Thanks

[jvmarino]

I am curious of people's thoughts on another bit of conflicting info I have seen. I see the NGK BP6ES mentioned a lot, but the NGK application guide calls for BR6ES for the 4 cylinder 914 engine.

I know the "R" just indicates the ignition noise suppression, so my main question is the "P", projected tip, correct, even thought NGK says to use the non projected plug?

[Piledriver]

I am curious of people's thoughts on another bit of conflicting info I have seen. I see the NGK BP6ES mentioned a lot, but the NGK application guide calls for BR6ES for the 4 cylinder 914 engine.

I know the "R" just indicates the ignition noise suppression, so my main question is the "P", projected tip, correct, even thought NGK says to use the non projected plug?

The projected tip plugs have a wider effective heat range...
They act like hot plugs at low loads, and cold plugs when under high loads.

Sounds like BS but its basic engineering applied well.

I don't think I have run non projected tip plugs in 25 years.

...And the copper/nickel triples are not BS, they last a lot longer before the performance goes south.
NGK BP6ET or #1263 (or Bosch W7DTC if you can find them, work same AFAICT)
These are a VW approved plug for a 914, BTW.
There is also a 5/8" hex version that's a bit easier to get in/out but I cannot recall the part#.

The multi-electrode platinums are junk IME, due to the fine wire electrode that erodes down the hole in the insulator after a few thousand miles.
An iridium version might actually work. I might even buy a set to try if they existed.
(OK, Nippondenso actually makes such beasts ALSO with platinum tips on the 3 ground straps, for $15... Just need o figure out desnos part# system...)

On newer cars that disappearing act kills coils, on older cars it just runs like garbage.

[jvmarino]

I am curious of people's thoughts on another bit of conflicting info I have seen. I see the NGK BP6ES mentioned a lot, but the NGK application guide calls for BR6ES for the 4 cylinder 914 engine.

I know the "R" just indicates the ignition noise suppression, so my main question is the "P", projected tip, correct, even thought NGK says to use the non projected plug?

The projected tip plugs have a wider effective heat range...
They act like hot plugs at low loads, and cold plugs when under high loads.

Sounds like BS but its basic engineering applied well.

I don't think I have run non projected tip plugs in 25 years.

Thanks for the reply on projected tip. I had already gone with the non-projected tip plug and will keep this thread in mind for the next time I need to purchase plugs. The car runs pretty nicely so I don't see a need to replace them now.

Jim