 Too hot of a plug? |
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| DNHunt |
 May 21 2003, 06:00 PM
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#1
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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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| ChrisFoley |
May 22 2003, 03:49 PM
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#2
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I am Tangerine Racing Group: Members Posts: 7,990 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None 
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QUOTE(DNHunt @ May 21 2003, 05:53 PM) 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 13.8:1 is definitely too lean for full power application. It may be close to peak power at that AFR, but too hard on the valves/pistons. Exhaust temps could be as high as 1450F running that lean 12.8-13:1 would be a better ratio. A bit rich of peak is much safer at WOT. |
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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 Should I be worried? Here is a picture of the two ... May 21 2003, 07:53 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 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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