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-   -   Take a look at these sparkplugs please (http://forums.pelicanparts.com/porsche-911-technical-forum/351640-take-look-these-sparkplugs-please.html)

AndrewWolfeUK 06-12-2007 04:00 AM

Take a look at these sparkplugs please
 
Hi guys,

The car is a 73 911 with 2.4 mfi

I'm right in the middle of a service and i noticed this...

These are the plugs i was given at the shop, under inspection they are 2mm longer than the old ones.

Are these plugs going to bash a hole in the top of the piston or will they clear?

as always many thanks in advance

http://www.immortalperformance.com/plugs.jpg

hcoles 06-12-2007 04:23 AM

I'm no plug expert, but it looks to me like these are different heat ranges and I would not put them in until triple checking with various sources and turning the engine over by hand before starting.

bkreigsr 06-12-2007 04:34 AM

these are the plugs Porsche specifies for this application:

999 170 128 90

extended tip, old school, wire electrode.
resists the typical fouling, but they are $14.00 each from our host.

Bill K

Steve@Rennsport 06-12-2007 07:04 AM

Those plugs are just fine,...:)

The extended tip design helps keep them clean.

David 06-12-2007 10:07 AM

The stock plugs are a projected type like the one on the right, the other's not. I've used both and not noticed any difference.

hcoles 06-12-2007 11:50 AM

The only thing I don't like about the plug on the right is that it isn't NGK :-)

EarlyPorsche 06-12-2007 01:48 PM

I know its better, its a Bosch. Bosch plugs also don't blow through the ceramic like NGK and Champions do.

hcoles 06-12-2007 01:53 PM

ok, we will see.. I just installed NGK on me 3.2.. runs fine so far keeping my fingers crossed I guess


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