One heat grade colder spark plugs

[BackroadBomber]

It has coil packs there's no distributer so it's electric. The nice thing is that even though I have no manual control over the timing, ford kept the same harmonic balancer from the 80's so it still has timing marks

[ChazInMT]

Press & hold "Alt", then type 0176, release Alt, to get a ° symbol, fwiw.

Alt Key Codes

[BackroadBomber]

Well I won't get to this until the weekend. My buddies truck broke down and he needed to borrow the ranger till payday Friday. But, remember how I said my ignition timing is 20* before TDC? Well, according to the Internet, it's supposed to be at 10*... Is this why I've been getting crap mileage? Also, what could cause this? (Same plugs as when I was getting close to 30mpg)

[serialk11r]

Originally Posted by BackroadBomber

Well I won't get to this until the weekend. My buddies truck broke down and he needed to borrow the ranger till payday Friday. But, remember how I said my ignition timing is 20* before TDC? Well, according to the Internet, it's supposed to be at 10*... Is this why I've been getting crap mileage? Also, what could cause this? (Same plugs as when I was getting close to 30mpg)

20 degrees at part load sounds like it's in the right range...I think?

[E.Roy]

Bosch Heat Range Conversion Chart, Has NGK, Denso, etc

https://www.boschsparkplugs.net/lear...nversion-chart

or From NGK
http://www.ngk.com/learning-center/a...nversion-chart

[XYZ]

Originally Posted by Old Tele man

...simple "verification" test is to pull a plug every so often and SEE if it's running hot (burnt) or cold (carboned up).

That's the best indicator.

If you do a lot of local driving, meaning short trips and often with the engine not up to operating temperature you will be better off with a hotter plug.

[3-Wheeler]

Originally Posted by topcat

.... Car manufacturers will bias this trade-off towards hot because it keeps the service interval longer......

I think that is a pretty big assumption!

If you take this logic a step further, it would read something like this....

The spark plug engineer speaking, "yes, we decided with a longer insulator tip, as this will lengthen the service life of the 'service interval'. However, we are now getting complaints of engine detonation for those who like to drive full throttle on the Autobahn. Oh that's OK as we built in a lot of extra cost into the vehicle to cover warranty work, so we should be fine!!"

Now would we expect that the vehicle engineers would actually say this? I doubt it, as profit margins on cars are very tight, especially for small cars. The engineers will always select a plug insulator temperature that gives them a safety factor for drivers who abuse the vehicle.

Elongating the service interval would take a back seat to keeping an engine from melting down due to a too hot spark plug in there.

Jim.