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Re: Bosch +4's in MC motor(long)
The old platinum's in my '84 4sq ran excellent for close to 100kmi.!
Lewis, Gary M wrote:
> Jay said;
> > Whats bad about regular platinums again?
> Read this:
> copied from
> Tech Tip No. 16
> Ned Ritchie
> Originally published in the quattro quarterly
> Copyright 1997
> Wrong Spark Plugs
> Over the years I have traveled to many Quattro Club track event and safety
> seminars. Usually at each event the following scenario takes place. Says
> the owner of the Quattro, "I just can't believe it. I had a tune up a few
> days ago to prepare for the event and now the engine runs terrible. I find
> it hard to start and it misses under load."
> I and a few knowledgeable owners will reply, . . . bet you're using Bosch
> platinum plugs. We open the hood and sure enough there are five clean
> Bosch WR7DP plugs. Usually someone has a set of old plugs that they're
> carrying around in some tool box. The used but correct plugs are installed
> and the engine runs perfectly.
> The Bosch WR7DP platinum spark plugs just do not work in the turbo
> application. I've talked to some Bosch employees, but they've not heard of
> the problem, but were willing to listen.
> What spark plugs should you use? The smart thing is to use what is
> recommended in your owner's manual. Audi has done a lot of testing to
> determine the correct plug, and the Bosch platinum is not one of them.
> What do I recommend? On Audi 10-valve turbocharged engines I recommend the
> Bosch W7DTC
> NGK BP6ET
> These are a long life plug with three ground electrodes that enable the plug
> to last up to three times as long as standard plugs. But, here is a bit of
> trivia about multiple electrode plugs. Multiple electrode and platinum
> plugs of any type to not work with the Jacobs Ignition System.
> If your budget can afford it use the better spark plug that is used on the
> Audi 20-valve turbocharged engines that was not available when the 10-valve
> engines were made:
> Bosch F5DPOR
> These plugs have a pair of platinum electrodes that are side gapped, but
> have a price hovering around $20.00 each!
> On my 400+ hp 20-valve turbo engine it was beyond the recommended time to
> replace these plugs even though the car was running well. Upon examination
> the plugs looked as good as the $20.00 plugs I was installing. I put the
> old plugs into my daughter, Marni's, 4000S quattro as an experiment, and
> they've been running well for three years.
> INTENDED ACCELERATION
> (c) Copyright 1997 & 1998 Ned Ritchie