 Too hot of a plug? |
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| DNHunt |
 May 21 2003, 06:00 PM
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914 Wizard? No way. I got too much to learn.  Group: Members Posts: 4,099 Joined: 21-April 03 From: Gig Harbor, WA Member No.: 598  |
I run an MSD 6A ignition and I have been using Bosch W5CC plugs with a .050 gap. This time I couldn't find that plug so we substituted an NGK R5671A-7 with the same gap. I ran it for about 20 miles and the car runs great. Cylinder head temperatures are the same but when I checked the plugs they sure are lighter in color than I am used to. How long does it take to get an idea of the way the spark plug burns? Do I need more miles or is this plug hotter?
Thanks for your help, Dave |
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| DNHunt |
May 21 2003, 07:53 PM
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#2
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914 Wizard? No way. I got too much to learn. Group: Members Posts: 4,099 Joined: 21-April 03 From: Gig Harbor, WA Member No.: 598 |
Should I be worried? Here is a picture of the two plugs out of #1. The Bosch is on the right and the NGK is on the left. Granted the Bosch is old but it doesn't look as bad as the picture. It has dark grey electrodes and some soot at the outer ring. It was in the car when I converted to the Megasquirt ECU and saw some rich mixtures averaging around 12.5/1.
The NGK is certainly seeing leaner conditions with the system now running in closed loop correcting to 13.8/1 for a target AFR. Thanks, Dave |
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Posts in this topic
DNHunt Too hot of a plug? May 21 2003, 06:00 PM
Brad Roberts That plug is hotter. It should only take a few min... May 21 2003, 06:33 PM seanery That's what we just put in my car, right? May 21 2003, 06:40 PM Brad Roberts Correct.
B May 21 2003, 06:44 PM DNHunt Sorry forgot the picture, doh!! May 21 2003, 08:13 PM seanery I'm surprised by the difference in the size of... May 21 2003, 08:15 PM DNHunt That's kind of misleading. Everything looks th... May 21 2003, 08:24 PM Brad Roberts The NGK looks lean to me. The V groove works.. not... May 22 2003, 12:48 AM Scott Schroeder Hi Brad -
What are you gapping your plugs at? I am... May 22 2003, 09:51 AM DNHunt Guess I'll richen the mix just a little. I was... May 22 2003, 11:08 AM Brad Roberts 45 thou.
B May 22 2003, 11:08 AM Bleyseng How about this one, Brad?
Geoff May 22 2003, 11:40 AM Bleyseng G*d D**m buttons May 22 2003, 11:41 AM seanery Scotch tape dispenser with a spark plug!
What... May 22 2003, 11:55 AM Bleyseng That was so I could take a picture of it ya nitwit... May 22 2003, 12:05 PM Brad Roberts It looks pretty damn good to me. A tad lean.. but ... May 22 2003, 12:16 PM seanery What?
Did I post something with my feet in the pic... May 22 2003, 12:26 PM Bleyseng Sean, that's a standing joke on the BBS's.... May 22 2003, 01:56 PM Anton Geoff,
what spark kind of plug is that in the pi... May 22 2003, 02:51 PM Qarl How about pics of dog paws? May 22 2003, 03:03 PM Anton You need a dog to hold your camera? :P May 22 2003, 03:11 PM Qarl Yes... only my German Shepherd can photograph my P... May 22 2003, 03:15 PM Qarl Here he is protecting the "stash" of parts... May 22 2003, 03:17 PM Anton Nice dog. Nice stash of parts too with the GT flar... May 22 2003, 03:43 PM Racer Chris Bleyseng I thought the factory WOT was close to 12.5 to 1 A... May 22 2003, 05:24 PM Anton Now I am confused. Are we talking about the Bosch ... May 23 2003, 12:17 AM Bleyseng The pic is of a W7DTC that was in my 76 2.1 914. May 23 2003, 08:32 AM Anton Geoff,
Thanks for the reply. I will try this spar... May 23 2003, 09:45 AM Bleyseng I installed an MSD unit and didn't see much of... May 23 2003, 09:55 AM Jeff Krieger Why would you ever need a mixture richer than stoi... May 23 2003, 10:39 AM DNHunt Jeff,
The main reason we run on the richer side ... May 23 2003, 11:13 AM Bleyseng Yes, the air cooler cars run a richer charge for c... May 23 2003, 01:19 PM Jeff Krieger Dave, here are the chassis dyno results for a Renn... May 23 2003, 01:23 PM Bleyseng 83hp is pretty good but I think he is running a ta... May 23 2003, 01:34 PM tod914 ;) ah so i guess 4500 rpm is the magic number to s... May 23 2003, 01:39 PM Bleyseng No, about 5000 so when you shift (the engine rpms ... May 23 2003, 01:51 PM
Jeff Krieger |
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