From: owner-perf-list-digest ford-trucks.com (perf-list-digest)
To: perf-list-digest ford-trucks.com
Subject: perf-list-digest V2 #255
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perf-list-digest Monday, October 4 1999 Volume 02 : Number 255



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Ford Truck Enthusiasts - Performance
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In this issue:

FTE Perf - plugs
Re: FTE Perf - plugs
Re: FTE Perf - plugs
Re: FTE Perf - plugs

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Date: Sun, 3 Oct 1999 11:19:34 -0400
From: "Joe Merchak"
Subject: FTE Perf - plugs

Ok guys I have a question, I have a engine that is spark knocking, the
timing, fuel, air intake and exhaust is fine and checks out. I remember
that a hot or cold plug and also be the problem. Which way would you go to
help spark knock, colder that stock or hotter then stock.

Thanks

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Date: Sun, 03 Oct 1999 10:41:57 -0700
From: George Miller
Subject: Re: FTE Perf - plugs

You didn't mention what the engine is or if it's modified. In many
cases, a stock engine will build up carbon deposits from sustained low
rpm driving which may cause detonation. In that case, you want to go to
a hotter (numerically higher for most US plugs, lower for NGKs) plug to
burn off the deposits. For a modified engine with intake valve overlap,
the reverse is normally true. Colder plug for street and up again for
severe usage.

Your problem is generally caused by ignition timing. While the timing
may look fine at idle under a standard timing light, what's the total
timing advance at off-idle up to 3,000rpm? Whether you have a vacuum or
mechanical advance, it's important to determine the total. Most newer
timing lights offer a digital readout of your advance at various RPMs.

Sorry to ramble off the plug question but experimentation with plug heat
ranges will get expensive and may not solve your problem.

George Miller

Joe Merchak wrote:
>
> Ok guys I have a question, I have a engine that is spark knocking, the
> timing, fuel, air intake and exhaust is fine and checks out. I remember
> that a hot or cold plug and also be the problem. Which way would you go to
> help spark knock, colder that stock or hotter then stock.
>
> Thanks
>
> == FTE: Uns*bscribe and posting info http://www.ford-trucks.com/faq.html
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Date: Sun, 3 Oct 1999 13:34:54 -0600
From: "Danger"
Subject: Re: FTE Perf - plugs

> Ok guys I have a question, I have a engine that is spark knocking, the
> timing, fuel, air intake and exhaust is fine and checks out. I remember
> that a hot or cold plug and also be the problem. Which way would you go
to
> help spark knock, colder that stock or hotter then stock.
>
> Thanks
.......

Year, make, model, engine, any modifications (high compression
ratio)?... these items are useful for troubleshooting.

Perhaps you could use the recommend spark plug by the manufacturer of
your vehicle and make sure that the gap is what it should be. In all honesty
it sounds like your problem could be a result of the timing being to far
advanced.

Danger
danger csolutions.net



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Date: Sun, 3 Oct 1999 16:45:11 EDT
From: FLR150 AOL.COM
Subject: Re: FTE Perf - plugs

Colder than stock. Being as a hotter plug makes a hotter spark and the spark
knock is most likely being caused by detonation, then you would need to make
the spark colder so as not to detonate. I would also recommend checking the
timing and run a tank of higher octane fuel. This may help with you problem.
Later
Wayne Foy
'94 Flareside SC
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End of perf-list-digest V2 #255
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