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Old 11-26-2012, 04:46 PM   #11 (permalink)
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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

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Old 11-26-2012, 05:05 PM   #12 (permalink)
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Old 11-27-2012, 10:24 PM   #13 (permalink)
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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)
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Old 11-27-2012, 10:59 PM   #14 (permalink)
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Quote:
Originally Posted by BackroadBomber View Post
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?
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Old 10-06-2013, 12:46 PM   #15 (permalink)
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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
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Old 10-06-2013, 02:55 PM   #16 (permalink)
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Quote:
Originally Posted by Old Tele man View Post
...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.
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Old 10-06-2013, 03:33 PM   #17 (permalink)
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Originally Posted by topcat View Post
.... 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.

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