Bosch Platinum2 and +4

[alfatbo]

Does anyone know the Bosch part number for the Platinum2 and/or +4 plugs for a '74 Spider? All of the local parts places are telling me they can't find anything listed. Thanks!!

Terry

[DaveC]

They are right. The Bosch plug catalog that I have (2002/2003) only lists regular Platinum Part# 4216. However the equivalent to a 4216 in Platinum + 4 is 4477 and Platinum 2 is 4310.

Dave

[Roadtrip]

Here's what I have:

Bosch Platinums WR7DP (as supplied by IAP)
NGK BP6ES
Autolite 63

[alfatbo]

Thanks guys. As always, much appreciated.

Terry

[SpiderFrek]

State attenti, amici a usare le BOSCH sui Bialbero ALFA, qui in Italia, nessuno lo fa, è noto che il Bialbero Alfa, vista la sua particolare conformazione della calotta dei pistoni e della Testata, sviluppa temperature elevate, si rischia di fondere le candele o peggio di bucare i pistoni, specie con i motori alimentati a CARBURATORI, io uso SOLO SPICA LODGE GOLDEN 2HL per i BIALBERO, 25 HL per i BOXER, 25 HLD per i Bialbero Twin SPARK 8 Valvole, e con quelle candele non si incontrano mai problemi statene certi!

CIAO

[ar1750gtv]

Quote:

Originally Posted by SpiderFrek State attenti, amici a usare le BOSCH sui Bialbero ALFA, qui in Italia, nessuno lo fa, è noto che il Bialbero Alfa, vista la sua particolare conformazione della calotta dei pistoni e della Testata, sviluppa temperature elevate, si rischia di fondere le candele o peggio di bucare i pistoni, specie con i motori alimentati a CARBURATORI, io uso SOLO SPICA LODGE GOLDEN 2HL per i BIALBERO, 25 HL per i BOXER, 25 HLD per i Bialbero Twin SPARK 8 Valvole, e con quelle candele non si incontrano mai problemi statene certi! CIAO

[alfatbo]

Interesting, I had not heard anything like this before. Has anyone experienced such problems with the Bosch plugs? My engine is almost ready for its maiden voyage and I certainly don't wanted a pierced piston!!

[DaveC]

Nonsense, I've had Bosch Platinum 2 plugs in my car for years. No problem at all with the plugs. I could see a possible problem with the electrode design on the platinum on a head that has been shaved repeatedly but the plug would be destroyed before the piston. If they are melting piston's then there is a problem with fuel delivery (to lean).


Rereading the translation, I see that he mentions the boxer and twin sparks. There are none of these engines in the U.S. other than a very few twin sparks. The boxer engined cars were never sold in the U.S.

Spiderfrek, We in the good ole USA have no new Alfa's. The last new car sold was in 1995. Allthough I suspect Alfa would do well here. We will not be getting any new Alfas anytime soon.

Dave

[gotglasses]

I did have a similar complaint re the original platinum, with its heavy electrode bridge and there was a thread on this - re the valve rubbing against the plug.

I had one unique failure with a platinum plug that was misfiring - the thin platinum wire electrode had pulled out of the plug and slid into the bridge , did not fall out but was not firing. I went to copper plugs and Lodge after that.

[jbbosco]

"Wes Ingram recommends the NGK BP7ES sparkplug, and says to index the gapped open end to face the intake valve.
(Indexing refers to a process whereby auxiliary washers of varying thickness are placed under the spark plug’s shoulder so that when the spark plug is tightened, the gap will pointed in the desired direction)"