spark plug destroyed one race weekend....
Still pretty new to the rotary scene. I drive a 1979 12a in ITA. This weekend just kept getting worse. I knew going in my rear rotor was really low on compression and the front is acceptable on a good day. I changed my plugs before the race weekend. All weekend the engine kept getting weaker and weaker then staeted hesitating. I think it was fuel filter clogged cause I removed and back washed it and the hesitating stopped. By that time I was down about 2 additional lap seconds....
Got the car home and pulled the plugs. Both leading plugs looked like they were burnt up a brown color and the contacts were melted a bit and deformed. However the trailing plugs looked perfect other than a bit of oil..... What's the deal? Is it normal for one to get burnt up and others to stay good? I just got an engine with 30k on it ti swap in and if its a carb or fuel supply problem I don't want to ruin this engine also.... Where should I start, I'm sure the carb hasn't been touched in at least 15 years but its run really hard all the time so I doubt any corrosion could build up. |
what part Number of plugs were in it?
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They were same ngk I've been running br8eq14.
Can someone else tell me where to find steps to put a 83 12a into a 79? They look a lot different... |
a few possibilities to explore ...
1. the type of plugs you were running - (as inquired above) 2. timing (may need more or less) 3. you mentioned fuel starvation ... that sounds like "lean moments" to me |
Originally Posted by rithsleeper
(Post 11427559)
Can someone else tell me where to find steps to put a 83 12a into a 79? They look a lot different...
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Holy crap that was a ton of crap on that engine. I got it all off and they look the same now. Now just have to get the huge socket to get my flywheel off.
What plugs should I use if not these. I'm pretty sure it would be fuel starving. I just don't want to burn up the seals in this new engine. How would you check for a lean condition without o2 sensors? Just keep pulling the plugs till they are black? |
Originally Posted by rithsleeper
(Post 11427735)
Holy crap that was a ton of crap on that engine. I got it all off and they look the same now. Now just have to get the huge socket to get my flywheel off.
What plugs should I use if not these. I'm pretty sure it would be fuel starving. I just don't want to burn up the seals in this new engine. How would you check for a lean condition without o2 sensors? Just keep pulling the plugs till they are black? you will need a gauge of some sort. you can track AFR or EGT, but since AFR is what you actually want, then it would probably make more sense to get that. |
So if I can't change the flywheel over what do I do? Can I transfer my clutch plate? It looks like the 79 flywheel is a lot lighter and way less material but looks like the gear sits the same distance from the engine. I have the clutch from the new engine but I'm not sure the shape it is in... can I use a 79 clutch assembly on the 83?
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I think you can use the '79 disc in the '83, but I've never tried it myself.
maybe this thread will make it somewhat clearer: https://www.rx7club.com/1st-generati...estion-984008/ |
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