Spark plug help

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

Plasticman - 11 Jan 2004 23:26 GMT

I just picked up a set of the Bosch Platinum+4's for my 93 diamante.

The dealer told me that these plugs don't work well in Mitsu's does anyone
have any experience with them.

Also are there any tricks to getting the plugs in the rear 3 cylinders? do I
have to take off the air chamber or can I squeeze my hand and wrench in
there?

Thanks for any help you can offer.

Reply to this Message

Wayne Taylor - 12 Jan 2004 12:18 GMT

Mitsubishi recommend NGK or Denso plugs.
To change right bank plugs, first remove air intake plenum, not too hard.

Watheroo
'98 Verada (Diamante)
I just picked up a set of the Bosch Platinum+4's for my 93 diamante.

The dealer told me that these plugs don't work well in Mitsu's does anyone
have any experience with them.

Also are there any tricks to getting the plugs in the rear 3 cylinders? do I
have to take off the air chamber or can I squeeze my hand and wrench in
there?

Thanks for any help you can offer.

Reply to this Message

Chris Ferris - 12 Jan 2004 16:33 GMT

> I just picked up a set of the Bosch Platinum+4's for my 93 diamante.
>
[quoted text clipped - 6 lines]
>
> Thanks for any help you can offer.

I've heard that the platinum plugs don't disapate heat well at all, to
the point that the heat collected in the prongs will cause premature
detonation (can you say "Knock" children, I knew you could).

The NGK's don't have this problem. Use the 6ES's if you are running
anything below 18PSI on your turbo, use 7ES's only if you are running
18PSI and all the accompanying mods to get it up to there. And no, you
can't run 7ES's if you are using a T25, they can only go to 15PSI.
Anything greater than that is boost creep.

Regards,
CMF

Reply to this Message

Robert Honea - 13 Jan 2004 12:32 GMT

It's a Diamante. They don't have turbos on those. Knock isn't an issue for
him.

Platinums should dissipate heat just as well as long as the temp rating is
what is required. The bad thing about platinum's is they don't conduct the
spark as well. Not a big issue on a naturally aspirated engine.
Historically, people aren't happy with non-NGKs in the turbo'd Mitsubishis.
If you don't plan on changing to plugs for a long time and are non-turbo,
the platinum's should be fine. I don't like the +4 design. Too hard to gap
and silly snake oil in the ads.

Signature

Robert T. Honea, AKA;
01010100011011110110010001100100

> The NGK's don't have this problem. Use the 6ES's if you are running
> anything below 18PSI on your turbo, use 7ES's only if you are running
[quoted text clipped - 4 lines]
> Regards,
> CMF

Reply to this Message

Victor - 16 Jan 2004 22:24 GMT

I've tried many spark plugs over the years. and on several different cars
and I can say from my experiance that BOSCH plugs suck.(used them on three
different cars)

For a while I liked the SplitFire
and I now like the AC Delco RapidFire even better.

I would only buy denso, or rapidfire at this point.

> I just picked up a set of the Bosch Platinum+4's for my 93 diamante.
>
[quoted text clipped - 6 lines]
>
> Thanks for any help you can offer.

Reply to this Message

Eric F - 29 Mar 2004 08:44 GMT

BOSCH plugs are very good for European cars. they perform ok on everything
else.
Use Denso's or NGK's. Want plugs that last longer? Go with plats,
otherwise, copper's are perfect.

the +4 is a nice plug, it does not need gapping, however, they're designed
for the more sophisticated engines like the BMW, Mercedes, Cadillac
Northstar motor, etc..

> I've tried many spark plugs over the years. and on several different cars
> and I can say from my experiance that BOSCH plugs suck.(used them on three
[quoted text clipped - 16 lines]
> >
> > Thanks for any help you can offer.

Reply to this Message