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| NGK UR4 or UR5 https://slantsix.org/forum/viewtopic.php?t=24990 |
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| Author: | bwhitejr [ Wed Sep 19, 2007 4:25 am ] |
| Post subject: | NGK UR4 or UR5 |
I would like to try some of the NGK UR series for my peanut head SL6. I have a mild build-up (see below), but I don't want to buy two sets of spark plugs to find out which ones I need. The Champion RV12YC's work fine, just want to see if there is a difference. So is the recommendation UR4 or UR5? bwhitejr |
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| Author: | SlantSixDan [ Wed Sep 19, 2007 5:28 am ] |
| Post subject: | |
The difference between them is heat range. The 4 is hotter, and the 5 is cooler. Me, I would probably pick the UR5 or maybe even try a slightly colder UR6 to start with for extra ping-resistance, unless the engine tends to foul spark plugs, in which case I'd go UR5 or UR4. |
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| Author: | Dart270 [ Wed Sep 19, 2007 6:14 am ] |
| Post subject: | |
I have used GR4, GR45, and GR5 on my 64 motor (10.5:1 comp, yadda yadda). Works fine. I think I saw a slight drop in accel with GR5s, but no diff with GR45s. These are drool-tube plugs, but assumedly heat range is same. Lou |
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