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05-27-2023, 05:03 AM | #1 |
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Nu Rex Timing Advance
Good morning everyone. Quick question… One of the only things my wife doesn’t care for driving her ‘30 coupe is messing with her timing. I see Nu Rex has the mechanical timing advance kit for model A’s. Has anyone tried one of these? Seems like a cool add on for beginners or people who don’t quite understand the
Timing advance technique… I’d love to install one on her coupe if they’re legit. |
05-27-2023, 05:31 AM | #2 |
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Re: Nu Rex Timing Advance
Work very well. Some feel that have too much advance when using a high compression head.
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05-27-2023, 06:05 AM | #3 |
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Re: Nu Rex Timing Advance
That’s good to know. We have stock motors so it may be a great addition to her coupe!
Thanks for your feedback |
05-27-2023, 06:09 AM | #4 |
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Re: Nu Rex Timing Advance
For most Model A's the timing can be "set and forget." Why? As the rpm increases the turbulence in the combustion chamber increases so the fuel/air mixture burns faster. This is not exactly correct because of various factors, but close enough. To be totally correct the advance should change with rpm and throttle position. This would imply an advance mechanism like the Nu Rex and also a vacuum advance like the old VW bugs. Or, better yet, a computer, air mass flow sensor, other sensors, and rpm sensor like a modern car.
Getting back to the original question, some owners are taking the Nu Rex out of their car because the timing curve is not right. Search the forum on this subject. The advance curve has been published. You might consider a stop on the ignition lever so that your wife can just move the lever down to the stop and leave it there. It would be one or two notches retarded from the knee. Another option is an electronic distributor with a built in advance curve that is adjustable.
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A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past. |
05-27-2023, 02:11 PM | #5 |
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Re: Nu Rex Timing Advance
N'Abend Bruce,
I drive with this automatic ignition since one year. Works excellent by itself without any touch up. I would buy the NuRex ignition part again.
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05-27-2023, 05:26 PM | #6 |
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Re: Nu Rex Timing Advance
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https://www.fordgarage.com/pages/nurexadvance.htm There is no reason you can not retard the timing if you feel the Nu-Rex is advancing too much since the stock lever is still connected. Sometimes I will retard the timing when pulling a steep hill. I have mine set at 30° total advance. I am running a 5.5 head. Last edited by Y-Blockhead; 05-27-2023 at 05:38 PM. |
05-27-2023, 06:18 PM | #7 |
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Re: Nu Rex Timing Advance
If your automatic advance Nurex distributor is not advancing as it should, ring them and ask about a different set of weights and springs. The curve can be changed and the max advance limited to whatever you need with your high compression head.
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05-27-2023, 06:59 PM | #8 |
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Re: Nu Rex Timing Advance
The Nu-Rex auto advance does not have any springs or different weights to change. It has an imbalanced rotating ring that acts like a gyro. The curve can not be changed..
Last edited by Y-Blockhead; 05-27-2023 at 07:45 PM. |
05-28-2023, 01:08 AM | #9 |
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Re: Nu Rex Timing Advance
Darn it, I was thinking about an FS distributor.
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05-29-2023, 11:07 PM | #10 |
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Re: Nu Rex Timing Advance
They work great. Put a timing mark on the motor and set it for total advance.
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05-29-2023, 11:55 PM | #11 |
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Re: Nu Rex Timing Advance
The Phillips automatic timing device, of which the Nu-Rex device is a replica, was reviewed in the MARC News in 1962. The reviewer stated that his A's gas mileage improved 10% with the Phillips device installed, and it allowed him to pull hills in 3rd gear where previously he'd had to downshift. (I assume he hadn't been adjusting his timing on those hills.)
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05-30-2023, 12:46 AM | #12 |
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Re: Nu Rex Timing Advance
Couldn't you use a Model "B" distributor which has centrifical weights to advance? Just wondering.
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05-30-2023, 01:32 AM | #13 | |
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Re: Nu Rex Timing Advance
Quote:
I use an A distributor on my B engine.
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05-30-2023, 07:06 PM | #14 |
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Re: Nu Rex Timing Advance
Synchro909 in Post #13 seems to have had some bad experiences with the B distributor and there are several reasons for this. The advance mechanism as supplied by Ford was assembled and tested before installation. The NOS B-12170 assemblies that I have acquired over the years come with a stern warning on the box: "CAUTION - HANDLE WITH CARE, DO NOT TAKE THIS ASSEMBLY APART! It goes on to describe the testing and adjustment performed to give proper spark advance.
Down the road, the proper advance can become impaired by improper oiling, rust, dirt, or shade-tree adjustments to the mechanism. Most of the used B distributors I have acquired suffer from such faults. Indeed, it is common for the advance pivot arms to be frozen or difficult to rotate. I have tossed more than a few frozen assemblies into the trash out of sheer frustration. I prefer the B distributor on my Model A and they work well provided the advance mechanism is up to spec.. As for the theory that B-distributors contribute to cracked Model B engine blocks, I have my doubts. Never attribute to physics what might as well be explained by human failures: poor maintenance, improperly timed ignition, or the results of monkey business in an effort to "improve" the B distributor advance. Note also Ford's attempt to utilize a new thin-wall casting process for 1932, which resulted in a number of problems for both the Model B and V-8 engines. |
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