Spark Blowout
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TECH Apprentice
Joined: Apr 2002
Posts: 308
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From: Austin, TX
Spark Blowout I’m getting a little bit of spark blowout at 5500 rpms (ATI 9psi). I do have water alky injection going, AF is about 11.5 and advance is about 18.5. I’m running TR6 plugs gapped at what they ship at (I think it is .035).
Any ideas on what I should do to resolve it? It only seems to happen at that exact RPM. Almost feels like it hits the rev limiter for a brief moment and it does not always happen. EFI-live shows a tiny bit of KR at this point 0.3, but it is not even enough to show a reduction in timing. I also occasionally get a misfire detected at the same point.
I’m thinking about a new set of plugs (these are about 1yr old). Any other ideas? Should I try a little more timing? New plug wires? Check the block ground?
Any ideas on what I should do to resolve it? It only seems to happen at that exact RPM. Almost feels like it hits the rev limiter for a brief moment and it does not always happen. EFI-live shows a tiny bit of KR at this point 0.3, but it is not even enough to show a reduction in timing. I also occasionally get a misfire detected at the same point.
I’m thinking about a new set of plugs (these are about 1yr old). Any other ideas? Should I try a little more timing? New plug wires? Check the block ground?
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Joined: Nov 2001
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From: College Station, Tx
Re: Spark Blowout Definitely try changing the plugs - what kind of actual timing advance are you seeing? Have you tried pulling out a bit of timing (a few degrees) around that area (say +- 1000rpm) to see if that helps?
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Joined: Jan 2002
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From: Phoenix, AZ
Re: Spark Blowout Are you sure it's not the water/alky flowing too much? That's a possibility . . . I had what sounds to be the exact same problem, you'll never guess what mine was though. Cylinder #3 plug was not all the way in!!! Once I got it snugged down the problem went away. Only happened at 8psi+ and around 5000rpm.
- Dug
- Dug
Re: Spark Blowout I had something like that while tuning the powerdyne, no knock but it would start missing. I dropped timing two degrees at peak torque and it went away. You could also try a tighter plug gap, that might help it if pulling the timing doesn't make a difference.
-Geoff
-Geoff
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Joined: Apr 2002
Posts: 308
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From: Austin, TX
Re: Spark Blowout
Definitely try changing the plugs - what kind of actual timing advance are you seeing? Have you tried pulling out a bit of timing (a few degrees) around that area (say +- 1000rpm) to see if that helps?
What would be an ideal gap? Should I go down to .030. What are the downsides to decreasing the gap?
On The Tree
Joined: Feb 2002
Posts: 178
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From: Ann Arbor, MI
Re: Spark Blowout Did you check the gap on the plugs when you put them in? last set of tr6's I put in had to be closed down quite a bit to get to .035 gap.
I wouldn't trust the fact that they are supposed to be .035 outa the box. think they were more like .050 when I checked.
I wouldn't trust the fact that they are supposed to be .035 outa the box. think they were more like .050 when I checked.
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Thread Starter
TECH Apprentice
Joined: Apr 2002
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From: Austin, TX
Re: Spark Blowout
sure your valve springs are enuff?
What would be the exact signs of the springs not holding? Would boost spike? Would it sound anything like valve float?
Did you check the gap on the plugs when you put them in? last set of tr6's I put in had to be closed down quite a bit to get to .035 gap.
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From: East Side Performance! mASShole
Re: Spark Blowout Im wondering about gap myself, What should gap be?
Ps, My last 3 sets of tr6's came at around 0.65, They where WAT off. I closed them to around .45 and it seems ok, Is it to much?
Ps, My last 3 sets of tr6's came at around 0.65, They where WAT off. I closed them to around .45 and it seems ok, Is it to much?
Re: Spark Blowout valve springs will just show up as misfires in the 5000+ range...car just kinda quits pulling....it happens to nearly everyone with stock spings and 8 psi+ boost