Well it's more than half that.
Look what I found!
Thread Starter
Melting Slicks
Joined: Dec 2004
Posts: 2,137
Likes: 5
From: Howard PA
Look what I found!
During my disassembly for a cam change. Anyone care to guess what the gap on that silly thing is? I had to use a slide gauge to measure it! Looks like I found my high RPM stumble. This kind of plug will NOT be going back in.
Last edited by ALLT4; Jun 24, 2006 at 08:28 PM.
Safety Car
Joined: Feb 1999
Posts: 3,504
Likes: 4
From: Mexico Beach FL
Two pucks and it is close to .100".
When I did my heads and cam at 55K, I only had two plugs with both platinum pucks still on them.
The larger the spark plug gap, the more voltage it takes to fire the plug, and everything on the secondary side of the ignition system sees that extra high voltage -- including the Opti-Spark cap and rotor.
I've often wondered how many Opti-Spark caps got carbon tracked because the platinum pucks fell of the AC Delco worthless spark plugs.
Tom Piper
When I did my heads and cam at 55K, I only had two plugs with both platinum pucks still on them.
The larger the spark plug gap, the more voltage it takes to fire the plug, and everything on the secondary side of the ignition system sees that extra high voltage -- including the Opti-Spark cap and rotor.
I've often wondered how many Opti-Spark caps got carbon tracked because the platinum pucks fell of the AC Delco worthless spark plugs.
Tom Piper
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Originally Posted by Tom Piper
Two pucks and it is close to .100".
When I did my heads and cam at 55K, I only had two plugs with both platinum pucks still on them.
The larger the spark plug gap, the more voltage it takes to fire the plug, and everything on the secondary side of the ignition system sees that extra high voltage -- including the Opti-Spark cap and rotor.
I've often wondered how many Opti-Spark caps got carbon tracked because the platinum pucks fell of the AC Delco worthless spark plugs.
Tom Piper
When I did my heads and cam at 55K, I only had two plugs with both platinum pucks still on them.
The larger the spark plug gap, the more voltage it takes to fire the plug, and everything on the secondary side of the ignition system sees that extra high voltage -- including the Opti-Spark cap and rotor.
I've often wondered how many Opti-Spark caps got carbon tracked because the platinum pucks fell of the AC Delco worthless spark plugs.
Tom Piper
I use NGK plugs for just this reason.
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Thread Starter
Melting Slicks
Joined: Dec 2004
Posts: 2,137
Likes: 5
From: Howard PA
It's about 0.105, funny thing is that's the only plug that has somewhat of a puck left on the arm, even though it's hard to tell in the picture.
What's even stranger is the motor seemed to running pretty good with them like that, as far as I could tell anyway. Except the high speed stumble and that didn't happen until about 5000 RPM
I'm really looking forward to getting this back together though it's going to take some time.
With the Hot Cam, new springs, ported heads, and new wires and plugs among other things , it should run a hell of a lot better.
I take it the consensus is NGK's?
What's even stranger is the motor seemed to running pretty good with them like that, as far as I could tell anyway. Except the high speed stumble and that didn't happen until about 5000 RPM
I'm really looking forward to getting this back together though it's going to take some time.
With the Hot Cam, new springs, ported heads, and new wires and plugs among other things , it should run a hell of a lot better.
I take it the consensus is NGK's?
Thread Starter
Melting Slicks
Joined: Dec 2004
Posts: 2,137
Likes: 5
From: Howard PA
Originally Posted by larryfs
what is the mileage on that missing puck ?
Advanced
Joined: Feb 2005
Posts: 66
Likes: 0
From: Maryland
So the OEM platinum plugs may have lasted 10 years and 90,000 miles and the car still ran good yet the plugs are considered POS? By the way, I have talked to people at many corvette speciality shops including DRM and they all recommend using the OEM AC delco platinum plugs for a basically stock engine.
Large Impressive Member
Joined: Jul 2003
Posts: 65,811
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From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
I've used the standard NGKs for a while now in the Vette w/ no problems. This time I bought Autolites just because in my 35 years of wrench turning they've always been the consistently best plug in any kind of engine I've used them in. Re/ gap, my tuner says stock gap is way too wide and would have me set them at .030". I compromise and set them at .035" with good results in my LT1.
Thread Starter
Melting Slicks
Joined: Dec 2004
Posts: 2,137
Likes: 5
From: Howard PA
Originally Posted by ZMechanism
So the OEM platinum plugs may have lasted 10 years and 90,000 miles and the car still ran good yet the plugs are considered POS? By the way, I have talked to people at many corvette speciality shops including DRM and they all recommend using the OEM AC delco platinum plugs for a basically stock engine.
Race Director
Joined: Oct 2001
Posts: 19,653
Likes: 428
From: Melbourne Florida
Cruise-In IV Veteran
I'm with Corvette Kid NC on this one...I've been using the cheap Autolite's for 3 years now with no problems in my 93...I gap them to .030 and drag race my car 90% of the time...no misses and my car shifts at 5900+ rpm at WOT...it does idle a tiny, tiny bit rough with the small gap but under throttle is smooth as can be...
Melting Slicks
Joined: Jun 2000
Posts: 3,215
Likes: 6
From: Tampa Florida
I'm unsure of why folks close the gap on a essentially OEM high energy ignition system...one of the benefits of modern engine/electronics???
I mean for nitrous or forced induction, sure, but .030 is a gap that is old school relating to gaps used for points? Even HEI was a larger gap that that back in the early 70's...
Again, I run Rapid Fires with nary a problem and run it to 6900 rpm with a 11.9 measured compression ratio.
I mean for nitrous or forced induction, sure, but .030 is a gap that is old school relating to gaps used for points? Even HEI was a larger gap that that back in the early 70's...
Again, I run Rapid Fires with nary a problem and run it to 6900 rpm with a 11.9 measured compression ratio.