Cap Rotor and Coil for 68 427
03-16-2018, 08:32 PM
#1
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Cap Rotor and Coil for 68 427
I going to replace my cap, rotor, and coil on my 68 427/435 tripower. It has the transistor style ignition. I was looking at MSD Street fire 5500 from Summit for the cap and rotor, maybe theres a better option? And either the MSD street fire 5524 coil or Blaster 2 82023. Going to run MSD 31193 8.5mm Wires. Didn't know if anyone had any opinions on these parts, or better parts, and which coil to go with. I was going to get the Blaster 2 most likely, but wasn't sure if it would work fine with all the factory transister ignition components. I Think it should but don't want to ruin something either. Just tapping into the knowledge on this forum, and as always I appreciate the help.
Last edited by Tyrel B; 03-16-2018 at 08:33 PM.
03-16-2018, 08:57 PM
#2
I going to replace my cap, rotor, and coil on my 68 427/435 tripower. It has the transistor style ignition. I was looking at MSD Street fire 5500 from Summit for the cap and rotor, maybe theres a better option? And either the MSD street fire 5524 coil or Blaster 2 82023. Going to run MSD 31193 8.5mm Wires. Didn't know if anyone had any opinions on these parts, or better parts, and which coil to go with. I was going to get the Blaster 2 most likely, but wasn't sure if it would work fine with all the factory transister ignition components. I Think it should but don't want to ruin something either. Just tapping into the knowledge on this forum, and as always I appreciate the help.
If you need part #s or links, I can do that in an hour.
It's VERY hard to improve on a stock TI unit when they are working correctly. They do make new TI amplifier boards with improved transistors as well.
03-16-2018, 09:09 PM
#3
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Part numbers would be amazing if your willing to do that. Do you have any idea what the new TI boards cost? Guessing that most major vette part suppliers have them? I did like how the MSD cap was black, not sure if the Delco is or not. Thanks alot
03-16-2018, 09:26 PM
#4
Just the board is about $225. The whole unit is about $350
The coils are like $130. The numbers for sbc and bbc are different, but have the identical internals.
Delco cap is 12363081
Rotor is 12338671
NAPA cap is RR165
Rotor is RR169R
The coils are like $130. The numbers for sbc and bbc are different, but have the identical internals.
Delco cap is 12363081
Rotor is 12338671
NAPA cap is RR165
Rotor is RR169R
03-16-2018, 09:28 PM
#5
I haven't tried, but I doubt your going to stuff 8.5MM wires in stock cap.
03-16-2018, 09:57 PM
#7
Team Owner
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St. Jude Donor '22
as mentioned the ti coil is not a run of the mill
type.
just wanting to change it is not a good reason.
work more on the proper operation of the dist.
moves free and not sloppy.
type.
just wanting to change it is not a good reason.
work more on the proper operation of the dist.
moves free and not sloppy.
03-16-2018, 10:34 PM
#8
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I have previously gone through the distributor. The timing and all is set up the way Lars recommends. The cap and rotor aren't correct and could just use freshening up. The coil is something else some one put on, its not the OE TI coil, so if its recommended to run that Im going to replace it. I'm just wanting to freshen it all up, and get the correct parts, or better parts on it.
03-16-2018, 11:27 PM
#9
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I'm still using my original TI system, I did however upgrade my TI amplifier to the new solid state design. Mine old one was still working, however they do have a fairly high failure rate. The solid state board should be much more reliable.
As stated, hard to beat the TI system.!!
I'm also using 8 mm wires in the stock cap. Tight, however it can be done.
I used a wire set from Accel, spiral core, for a '75+ Corvette and changed the HEI cap ends to old style cap.
Also using a dist. cap from Carquest, it's black.
As stated, hard to beat the TI system.!!
I'm also using 8 mm wires in the stock cap. Tight, however it can be done.
I used a wire set from Accel, spiral core, for a '75+ Corvette and changed the HEI cap ends to old style cap.
Also using a dist. cap from Carquest, it's black.
03-16-2018, 11:58 PM
#11
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http://www.tispecialty.com/amplifiers.htm
Zip's E-499 is the solid state TI board that upgrades the amplifier.
Not sure if it's the exact same board that I have. It should work well.
Have you looked inside your TI amplifier to see if you have the old style transistor board?
I don't know how long you've owned your '68, someone may already have upgraded the board.
03-17-2018, 12:31 AM
#12
Team Owner
You would be better off replacing the whole TI system for a modern electronic ignition and storing those original pieces for posterity...or selling working pieces for $$$$$.
You could easily damage the TI module if the coil you put with it is not similar to the original coil. Too 'hot' of a coil would draw more current than that TI module could handle.
You could easily damage the TI module if the coil you put with it is not similar to the original coil. Too 'hot' of a coil would draw more current than that TI module could handle.
Last edited by 7T1vette; 03-17-2018 at 12:32 AM.
03-17-2018, 12:08 PM
#14
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You would be better off replacing the whole TI system for a modern electronic ignition and storing those original pieces for posterity...or selling working pieces for $$$$$.
You could easily damage the TI module if the coil you put with it is not similar to the original coil. Too 'hot' of a coil would draw more current than that TI module could handle.
You could easily damage the TI module if the coil you put with it is not similar to the original coil. Too 'hot' of a coil would draw more current than that TI module could handle.
The main danger with aftermarket coils is the turns ratio. The stock TI coil has a high Secondary-to-Primary turns ratio to keep the primary winding flyback voltage low to keep from blowing up the switching transistor or the protective zener diode. Most aftermarket coils have a lower S-P turns ratio that will cause a higher primary flyback voltage to occur every ignition event, causing higher stresses on the transistor and zener.