Spark plug readings
Thread Starter
Staging Lane
Joined: Jul 2006
Posts: 60
Likes: 0
Spark plug readings So what do you think?
http://i1150.photobucket.com/albums/...z/P1010559.jpg
http://i1150.photobucket.com/albums/...z/P1010558.jpg
Backstory - it's a mild cam LS1 in a roadrace car. Engine was rebuild this spring and ran a couple times this year. Seems black to me but looking for advise if I need to make any changes in the offseason. They are TR6 plugs and were new with the engine build.
Thanks
Cameron
http://i1150.photobucket.com/albums/...z/P1010559.jpg
http://i1150.photobucket.com/albums/...z/P1010558.jpg
Backstory - it's a mild cam LS1 in a roadrace car. Engine was rebuild this spring and ran a couple times this year. Seems black to me but looking for advise if I need to make any changes in the offseason. They are TR6 plugs and were new with the engine build.
Thanks
Cameron
A couple things:
1. No way could those plugs be read with those pics.
2. Repeated driving cycles on the plugs, pretty much renders reading them accurately, unlikely.
Start w/ fresh plugs, make a run, read the plugs....
1. No way could those plugs be read with those pics.
2. Repeated driving cycles on the plugs, pretty much renders reading them accurately, unlikely.
Start w/ fresh plugs, make a run, read the plugs....
Those plugs were used for a long time, not useful for reading.
I see a little oil and unburned fuel but I can see no more.
If you want to diagnose something using plugs, install a new set, do a run and shut the engine off immediately after the run (don't even idle it), or else the plugs will not show any useful information.
I see a little oil and unburned fuel but I can see no more.
If you want to diagnose something using plugs, install a new set, do a run and shut the engine off immediately after the run (don't even idle it), or else the plugs will not show any useful information.
Thread Starter
Staging Lane
Joined: Jul 2006
Posts: 60
Likes: 0
Since this is a road race car there is pretty much nothing but repeated cycles even in one 'run'. The car is now on stands for the winter off season so it wont move for probably 6 months. I was just looking to see if there is anything glaringly wrong with my setup that I should be looking into over the winter. Before I had it rebuild and the cam added the plugs came out what I am used to seeing. They are now much more black but dont know if that's from the break-in cycle when it was fresh or if the new tune is too rich or if the plugs are too cold or ???. Maybe nothing can be had from this but just doing the off season maintenance to get ready for next year so trying to make sure everything is in top shape.
Thanks
Cameron
Thanks
Cameron
Since you aren't using nitrous and don't race 1/4 mile, a wideband is the right choice for you.
Once you have AFR under control, install a new set of plugs, after the race pull them to check for proper timing and heat range.
Once you have AFR under control, install a new set of plugs, after the race pull them to check for proper timing and heat range.
Thread Starter
Staging Lane
Joined: Jul 2006
Posts: 60
Likes: 0
How do you recommend I get a tune file and data log? It was completely stock then with the build I had it dyno tuned. It seems to run fine but was leery of the dyno guy and the plugs seem much blacker than I'm used to. This is why I'm asking here because I'm wondering if need to find another dyno and have it re-tuned but dont know. I have no logging software but may be interested in getting something if it's reasonable. Last thing I tuned was a 3x2 carb set-up so tuning the LS is all new to me.
Cameron
Cameron
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