Question-plugs

[jlaird]

Anyone have a short or long list of brand and manf. number of sparkplugs useable on a stock 948?

 

[aeronca65t]

Any of these should be OK for normal street use.

Gap at 0.025" if using stock (points-type) ignition.

<span style="text-decoration: underline">NGK</span> BP6ES <span style="text-decoration: underline">or</span> BP7ES
<span style="text-decoration: underline">CHAMPION</span> N9Y <span style="text-decoration: underline">or</span> RN9YC <span style="text-decoration: underline">or</span> RN10Y
<span style="text-decoration: underline">Bosch</span> W7D
<span style="text-decoration: underline">Motorcraft</span> AG22

 

[Pythias]

Everything I've READ says those NGK as listed above (copper core!) plugs work best. Every body I've TALKED to says it doesn't matter all that much. The above list is probably the best I've seen.

 

[athenssprite]

How about a plug list for the 1275 engine?

 

[jlaird]

Thanks guys, appreciate.

At this point here is my list of stuff.

Bugeye expendables

<span style="text-decoration: underline">PLUGS</span>

Gap at 0.025" if using stock (points-type) ignition.

NGK BP6ES or BP7ES
CHAMPION N9Y or RN9YC or RN10Y
Bosch W7D
Motorcraft AG22
SKV 7333

<span style="text-decoration: underline">PLUG WIRES</span>

ACCEL #3009

<span style="text-decoration: underline">FAN BELT</span>

900mm

<span style="text-decoration: underline">SPIN ON OIL FILTER</span>

ACDELCO PF53

<span style="text-decoration: underline">WHEEL BEARINGS, FRONT, TIMKIN</span>

Inter 07097/07024
Outer 05066/05185

Please feel free to add items that you think of.

 

[dklawson]

I believe that Nial's list would also apply to the 1275. I know I've seen the NGK BP6ES and Champion N9Y recommended for the 1275.

 

[Pythias]

For plug wires, I'm running

Bosch 09041 .. for a top entry cap.

The NGK BP6ES are supposed to be good in ANY A-series engine unless the engine has been "tweaked" and is putting out a significant amount of extra horespower.

 

[jlaird]

Forget to say those wires I spec'ed are yellow, solid core, I use a side entry cap, and the purchase makes two sets.

 

[Sarastro]

The original owner's manual recommendations were Champion N5 plugs for the 948 and N9Y for the 1275. The modern equivalents are N5C and N9YC, respectively.

Anyone know what the difference is? Heat range, maybe? Both seem to be the same size, externally, or at least very close.

In view of this, some of the plugs on Nial's list seem to be more for the 1275. Is this correct? Or, does it really matter?

 

[aeronca65t]

Steve:

The N5 is a cold plug that is great at high speed or racing but may foul at "crusing around" speeds of a street car.

I guess back then they figured, originally, everyone who bought a Bugeye would tear around like a madman (so the N5s would be OK).

But extended idling or sub-2500 RPM driving would cause them to foul or load up. The N9Y is a hotter plug that will prevent this (but it's not a super hot plug, so it won't overheat at the tip if you run it at 4000 RPM for extended times).

In these 3/4" reach Champion plugs, the lower the number, the "colder" the plug (better for racing). On the other hand, an N14Y would be great for long idling, but the tip might overheat at high speeds.

Considering Jack's using his car for normal street use, the N9Ys (or even N10Ys) are fine.
I'm running N9Ys in my street MGB.

By the way on NGK plugs, the *higher* number makes the plug colder. A BP6ES is the "standard" plug and the BP7ES is better for high performance driving (colder).

 

[Hap Waldrop]

The same heat range that works for a 948, works for a 1275, and a MGB for that matter. I'm a big fan of NGK plugs, been using them over 20 years. The "P" in the part number of the NGK plug stand for projected tip, this work good for a stockish type motor, as you start shaving heads, bumping up cmpression ratio with perfofmance motors, lose the "P", and go with a plug without the projected tips, for example we most commonly use B8ES, B9ES, and B10ES in the race engine, NGK, makes even fancier, more expensive plugs, but they have never shown us any increase in HP on the dyno, so save your money.