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  View original topic: Who knew? Short vs. long spark plugs
ALLWAGONS Wed Aug 03, 2011 2:30 pm

even after an engine rebuild, my '72 411 had the shakes and had problems starting when cold. I took it to a type 4 specialist and he told me the engine builder used short spark plugs. They replaced them with long ones and it purrrs like a kitten, and gained power and it doesn't shake. I am a happy type 4 owner!

Bradey Bunch Wed Aug 03, 2011 3:45 pm

Cool! Any part numbers off either of the plugs?

Tram Wed Aug 03, 2011 11:36 pm

Yeah, all the Type 4s take a long- reach plug, BP6ES is the NGK number if I recall. Can't remember the Bosch offhand. It's been years!

The Sage Thu Aug 04, 2011 5:53 am

Tram wrote: Yeah, all the Type 4s take a long- reach plug, BP6ES is the NGK number if I recall. Can't remember the Bosch offhand. It's been years!

Is that all Type 4 engines or just 411/412?

raygreenwood Thu Aug 04, 2011 7:38 am

Yes...all type 4's. The 411/412 is the original type 4 vechicle from which all other type 4 engined vehicles got their engines. Except for a few differences they are basically the same.
BP6ES is one of the plugs....is the most standard plug...that you might use in a type 4 engine. It depends on compresssion, and how you drive it (ignition settings play in as well). For most high compression 411/412 and 914 applications with stock injection I have found that Bosch W7DTC and NGK BP6ET work best. Ray



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