busting up
Thread Starter
Pro
Joined: Sep 2012
Posts: 600
Likes: 6
From: Key West Florida
busting up
so i just took my vette out for a cruise and things got bad, i went to get on it and it had little power and sounded like it was missing untill 3500RPM then it started pulling strong. all i did from yesterday was i put the strongest springs back in my dizzy due to unstable idle with new cam and replaced the R45TS with a set of R44t plugs. any help would be greatful!
Team Owner
Joined: Jan 2007
Posts: 53,648
Likes: 878
From: Southern Cal Ca
St. Jude Donor '22
plugs are colder and will misfire until...
the more load the more misfire.
did you crack a wire or two when working?
use an ohms meter
springs? did you test them with a timing light?
a combo of the changes or one issue.
time to test.
the more load the more misfire.
did you crack a wire or two when working?
use an ohms meter
springs? did you test them with a timing light?
a combo of the changes or one issue.
time to test.
Thread Starter
Pro
Joined: Sep 2012
Posts: 600
Likes: 6
From: Key West Florida
one wire is alittle burned on the boot due to the old R45TS plug being longer than then R44T. and how do you test the springs with a timing light? just see what RPM they give full advance at?
Team Owner
Joined: Jan 2007
Posts: 53,648
Likes: 878
From: Southern Cal Ca
St. Jude Donor '22
I don't know what you were after in the changes made.
ignition gets funny when running out of specs.
the issue you experienced was misfiring under load break down.
wires will do that.
plugs will do that.
advance will contribuite to load.
so, everything done is suspect.
look up "testing ignition wires".
the heat range is curious. did the plugs show signs of heat?
good luck and you will learn.
Thread Starter
Pro
Joined: Sep 2012
Posts: 600
Likes: 6
From: Key West Florida
years ago i was told that a colder plug was better in the summer for performance and run what was called for stock in the winter. but wouldent it cause it to bust up throught out the entire RPM range, not just till 3500RPM?
Team Owner
Joined: Jan 2007
Posts: 53,648
Likes: 878
From: Southern Cal Ca
St. Jude Donor '22
does not explain the springs in the dist.
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Race Director
Joined: May 2006
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Likes: 2,582
wrong plug
The R45T is NOT an extended tip plug. You need R45TS and I cannt imagine there is a sufficient difference in the length of the plug body to effect spark plug wires.
Race Director
Joined: May 2006
Posts: 18,731
Likes: 2,582
Unstable idle
Are you running manifold vacuum to the distributor vaccuum advance or ported vacuum. You should be running manifold vacuum to stabilize the idle. What springs are you referring to, were they part of a kit?
Thread Starter
Pro
Joined: Sep 2012
Posts: 600
Likes: 6
From: Key West Florida
Ok, i fixed it, new R45TS plugs, new wires, put the lightest springs back in, to set timing i had a buddy sit in my car, put it in Drive and unhooked the advance, the load on the engine kept the idle stable to where i could time it, no backfire, great WOT performance, thanks everyone for the input