John Z
Thread Starter
Racer
Joined: Aug 2003
Posts: 404
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From: Sitka Alaska
John Z
The car-1961 Corvette.
The engine-1968 327 (HF), 291 heads, Elderbrock aluminum intake, Holley list 0-1850, AC R46S plugs, plug wires test out at less than 10K ohms per foot, original 283 centrifugal advance 1110891 distributor with the pertronix 1182D ignition and the pertronix coil, timing 10degress at 850rpm, T-10, 3.36:1 posi.
The problem- misses at 4000rpm to the point it will not wind up any higher. I'm thinking that perhaps this distributor is not a good match for this engine? Would the 1110946 be a better choice? Would it fit under the shielding?
Also-Since this is a 1968 engine there is no provision for a road draft pipe. "Bubba" just let the crankcase vapors spew out of the vented oil filler cap which smells up the cockpit and coats the under hood area with a dirt catching oil film. Can I add a PCV valve (there is a provision for one on the Holley carb) with no other problems? Would purchase a closed vent cap, run a hose from the oil filler tube to the PCV valve, another smaller hose to the vacuum provision on the carb, and run a hose from the valve cover to the air cleaner for the intake of the PCV system.
Thanks John for your past and future help
EVERGREEN
Alaskan Corvette
The engine-1968 327 (HF), 291 heads, Elderbrock aluminum intake, Holley list 0-1850, AC R46S plugs, plug wires test out at less than 10K ohms per foot, original 283 centrifugal advance 1110891 distributor with the pertronix 1182D ignition and the pertronix coil, timing 10degress at 850rpm, T-10, 3.36:1 posi.
The problem- misses at 4000rpm to the point it will not wind up any higher. I'm thinking that perhaps this distributor is not a good match for this engine? Would the 1110946 be a better choice? Would it fit under the shielding?
Also-Since this is a 1968 engine there is no provision for a road draft pipe. "Bubba" just let the crankcase vapors spew out of the vented oil filler cap which smells up the cockpit and coats the under hood area with a dirt catching oil film. Can I add a PCV valve (there is a provision for one on the Holley carb) with no other problems? Would purchase a closed vent cap, run a hose from the oil filler tube to the PCV valve, another smaller hose to the vacuum provision on the carb, and run a hose from the valve cover to the air cleaner for the intake of the PCV system.
Thanks John for your past and future help
EVERGREEN
Alaskan Corvette
Team Owner
Joined: Oct 2000
Posts: 38,897
Likes: 1,926
From: Washington Michigan
Re: John Z (EVERGREEN)
The 946 distributor will fit fine under the shielding (it was used from '59-'61 on 283/230hp engines); it has the benefit of vacuum advance (which wouldn't package with 2x4 carbs), and the centrifugal advance mechanism is right under the rotor, instead of buried below the breaker plate like it is on the centrifugal-only 891. Hard to diagnose the miss by remote control - could be a problem with the Pertronix module (is it connected to full 12 volts? If it's powered from the coil (+) terminal, it's only getting 7-8 volts), non-functional centrifugal advance mechanism, weak valve springs, or a number of other things. The 946 distributor is much easier to work with - let us know how it works out.
You need a functional PCV system; for the exhaust side, use the provision on the oil filler tube with a PCV valve and hose to the large nipple on the carb base (and a sealed oil cap). For the intake side, run a hose from the rear of the driver's side valve cover to the elbow on the air cleaner; how you do this depends on what valve covers you have and how you modify them. :thumbs:
You need a functional PCV system; for the exhaust side, use the provision on the oil filler tube with a PCV valve and hose to the large nipple on the carb base (and a sealed oil cap). For the intake side, run a hose from the rear of the driver's side valve cover to the elbow on the air cleaner; how you do this depends on what valve covers you have and how you modify them. :thumbs:
Le Mans Master
Joined: Apr 2001
Posts: 9,556
Likes: 288
From: Granbury Texas
Re: John Z (JohnZ)
I'll go with John on this one. I have 2 FI distributors....both on Pertonix. One developed a terrible (fatal at Sears point) miss and replacing the whole distributor cured the problem. No difference except for the Pertonix. I would guess that's the (a) problem.
Thread Starter
Racer
Joined: Aug 2003
Posts: 404
Likes: 0
From: Sitka Alaska
Re: John Z (EVERGREEN)
John Z,
Pertronix's instructions are quite clear about hooking their unit to the ignition switch (12v) side of the resistor, I also have their unit in my boat and it was a total set and forget package that works perfect to this day. The Pertronix coil (45,000v) is hooked to the other side of the resistor so it is probably only getting the 6 or 8 volts but I'm of the impression that this is correct?
I was going to use the back of the passenger side valve cover as the intake side of the PCV system as it is away from the throttle linkage so hose routeing would be easier, should I reconsider? Also, which AC PCV valve should I purchase or does it really matter?
Thanks John and sorry about more and more questions, its just that you have the right answers!
EVERGREEN
ALASKAN CORVETTE
Pertronix's instructions are quite clear about hooking their unit to the ignition switch (12v) side of the resistor, I also have their unit in my boat and it was a total set and forget package that works perfect to this day. The Pertronix coil (45,000v) is hooked to the other side of the resistor so it is probably only getting the 6 or 8 volts but I'm of the impression that this is correct?
I was going to use the back of the passenger side valve cover as the intake side of the PCV system as it is away from the throttle linkage so hose routeing would be easier, should I reconsider? Also, which AC PCV valve should I purchase or does it really matter?
Thanks John and sorry about more and more questions, its just that you have the right answers!
EVERGREEN
ALASKAN CORVETTE
Team Owner
Joined: Oct 2000
Posts: 38,897
Likes: 1,926
From: Washington Michigan
Re: John Z (EVERGREEN)
Follow the Pertronix instructions for the coil feed (or give their tech line a call and ask if their coil wants a full 12 volts or resistor-reduced voltage like the stock coil requires).
Doesn't really matter which valve cover you use for the PCV intake - whatever works best for your setup. The original PCV valve that screwed into the threaded bung on the oil fill tube was an AC CV-726C, GM #6422721. :thumbs:
Doesn't really matter which valve cover you use for the PCV intake - whatever works best for your setup. The original PCV valve that screwed into the threaded bung on the oil fill tube was an AC CV-726C, GM #6422721. :thumbs:
Thread Starter
Racer
Joined: Aug 2003
Posts: 404
Likes: 0
From: Sitka Alaska
Re: John Z (joe58)
joe58,
Understand but tried two differant coils with same result, will bite the bullet and get the #946 distributor, won't be able to go much further 'til spring as the roads have been frozen, sprinkled with snow, and worst of all, SALT!
Thanks,
EVERGREEN
Understand but tried two differant coils with same result, will bite the bullet and get the #946 distributor, won't be able to go much further 'til spring as the roads have been frozen, sprinkled with snow, and worst of all, SALT!
Thanks,
EVERGREEN
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Thread Starter
Racer
Joined: Aug 2003
Posts: 404
Likes: 0
From: Sitka Alaska
Re: John Z (JohnZ)
John Z,
Again thanks for the comeback. Pertronix tech line person says to use the resitance line or the coils life will be shortend due to overheating. I have had this same set up in my boat for nearly 10yrs and it has not missed a beat (cruise is 3000rpm hour after hour). Will bite the bullet and purchase the #946 distributor but will most likely have to wait until spring now as the roads have frozen, sprinkled with snow, and worst of all SALT!
Wow, the 726C PCV valve is $27! Going to have to be a really good boy for Santa!
Thank you,
EVERGREEN
Alaskan Corvette
Again thanks for the comeback. Pertronix tech line person says to use the resitance line or the coils life will be shortend due to overheating. I have had this same set up in my boat for nearly 10yrs and it has not missed a beat (cruise is 3000rpm hour after hour). Will bite the bullet and purchase the #946 distributor but will most likely have to wait until spring now as the roads have frozen, sprinkled with snow, and worst of all SALT!
Wow, the 726C PCV valve is $27! Going to have to be a really good boy for Santa!
Thank you,
EVERGREEN
Alaskan Corvette
