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Forum: Early V8 (1932-53) 01-19-2024, 08:20 PM
Replies: 206
Views: 17,162
Posted By Old Henry
Re: 47 V8 ignition mystery

Thanks. I believe that we will have all of that and more.

(Congratulations! Your post was the 200th of this thread that was thought would never end. Maybe now it can.)
Forum: Early V8 (1932-53) 01-19-2024, 06:52 PM
Replies: 206
Views: 17,162
Posted By Old Henry
Re: 47 V8 ignition mystery

Well, it looks like we have finally concluded that the rough running is nothing to do with anything exterior like ignition, carburetion, or external vacuum leaks. Everyone now seems to be suggesting...
Forum: Early V8 (1932-53) 01-19-2024, 09:53 AM
Replies: 206
Views: 17,162
Posted By Old Henry
Re: 47 V8 ignition mystery

So? What causes that and is it the cause of the engine running rough at all speeds? And, how to fix it?
Forum: Early V8 (1932-53) 01-18-2024, 10:45 PM
Replies: 206
Views: 17,162
Posted By Old Henry
Re: 47 V8 ignition mystery

Tonight I tested for vacuum leaks around the manifold and carb as follows:

Ran the engine at full idle speed (throttle plates totally closed).
Squirted some starter fluid into the carb to make...
Forum: Early V8 (1932-53) 01-18-2024, 10:39 PM
Replies: 206
Views: 17,162
Posted By Old Henry
Re: 47 V8 ignition mystery

The spark plug wires are all plugged in correctly. If any were swapped I think I'd get bad backfires.
Forum: Early V8 (1932-53) 01-18-2024, 10:38 PM
Replies: 206
Views: 17,162
Posted By Old Henry
Re: 47 V8 ignition mystery

Brian has also mentioned the heat riser but I don't understand what that has to do with the engine running rough. I would not want to run my car at below 0 temperatures without the heat risers.
Forum: Early V8 (1932-53) 01-18-2024, 10:35 PM
Replies: 206
Views: 17,162
Posted By Old Henry
Re: 47 V8 ignition mystery

The distributor and coil are creating reliable and steady spark as shown by HT wire from coil near head bolt when cranking and steady spark to all plugs except #6 mostly, #3 a little and #7 & 8 very...
Forum: Early V8 (1932-53) 01-18-2024, 10:29 PM
Replies: 206
Views: 17,162
Posted By Old Henry
Re: 47 V8 ignition mystery

In response:

Reading the timing light for each cylinder shows #6 missing the most followed by #3 some and #7 & 8 very rarely.

This video shows the vacuum gauge at full idle, i.e. throttle...
Forum: Early V8 (1932-53) 01-17-2024, 08:14 PM
Replies: 206
Views: 17,162
Posted By Old Henry
Re: 47 V8 ignition mystery

I hooked up my vacuum gauge and drove the car around looking for anything unusual like bouncing, etc. to indicate a valve problem. All was smooth and normal even though the engine ran as rough as...
Forum: Early V8 (1932-53) 01-17-2024, 08:09 PM
Replies: 6
Views: 494
Posted By Old Henry
Re: Rear axle nut torque

Got it.

Went down to the hardware store and got a couple of Grade 8 5/8" washers half as thick as the stock washer. Added them to the stack and got the hole lined up with the slots just fine at...
Forum: Early V8 (1932-53) 01-17-2024, 06:35 PM
Replies: 6
Views: 494
Posted By Old Henry
Re: Rear axle nut torque

I just saw where Mart, back in 2020, recommended Philidas brand aircraft locking nuts (https://philidas.com/wp-content/uploads/2020/03/all-metel-self-locking-nut-scaled.jpg) instead of the...
Forum: Early V8 (1932-53) 01-17-2024, 06:20 PM
Replies: 6
Views: 494
Posted By Old Henry
Rear axle nut torque

I just torqued the axle nut on my rear axle to 200 ft/lbs and the cotter pin hole in the axle landed smack dab in the middle between two slots on the nut. The nut won't tighten any further (I set...
Forum: Early V8 (1932-53) 01-17-2024, 09:08 AM
Replies: 206
Views: 17,162
Posted By Old Henry
Re: 47 V8 ignition mystery

I did that before all of this started and replaced all the replaceable parts but will probably do it again.
Forum: Early V8 (1932-53) 01-17-2024, 09:06 AM
Replies: 206
Views: 17,162
Posted By Old Henry
Re: 47 V8 ignition mystery

The problem is always there – hot or cold – far or near.
Forum: Early V8 (1932-53) 01-16-2024, 10:08 AM
Replies: 206
Views: 17,162
Posted By Old Henry
Forum: Early V8 (1932-53) 01-16-2024, 12:56 AM
Replies: 206
Views: 17,162
Posted By Old Henry
Re: 47 V8 ignition mystery

Today I did it. I added 6 oz. of MMO in the 15 gal. gas tank and filled it up. Then, while idling the engine, I drizzled 4 oz. of MMO into the carburetor - both sides. I was hoping there would be...
Forum: Early V8 (1932-53) 01-16-2024, 12:47 AM
Replies: 206
Views: 17,162
Posted By Old Henry
Re: 47 V8 ignition mystery

I feel like I made a major breakthrough today in the mystery!

As I was driving home from the 3° in Boise today (not in Old Henry) the thought came to me, "What if the stumbling problem of the...
Forum: Early V8 (1932-53) 01-13-2024, 11:04 AM
Replies: 206
Views: 17,162
Posted By Old Henry
Re: 47 V8 ignition mystery

Will do. Thanks for the reminder.
Forum: Early V8 (1932-53) 01-13-2024, 12:52 AM
Replies: 206
Views: 17,162
Posted By Old Henry
Re: 47 V8 ignition mystery

Thanks for the idea. I have actually been running it without the air cleaner for a week. I just put it back on. No difference.
Forum: Early V8 (1932-53) 01-13-2024, 12:19 AM
Replies: 206
Views: 17,162
Posted By Old Henry
Re: 47 V8 ignition mystery

I just rebuilt the carburetor at the beginning of all of this and it seems to be working just fine. Any carburetor problems I've ever had caused gradual or sudden loss of power, not this "stumbling"...
Forum: Early V8 (1932-53) 01-13-2024, 12:13 AM
Replies: 206
Views: 17,162
Posted By Old Henry
Re: 47 V8 ignition mystery

I haven't had any response from Michael regarding my distributor that he worked on to see if he thinks anything could be wrong with it causing my chronic missing problem. Hopefully, he'll respond...
Forum: Early V8 (1932-53) 01-13-2024, 12:10 AM
Replies: 206
Views: 17,162
Posted By Old Henry
Re: 47 V8 ignition mystery

I hadn't done a compression test but just did. It showed the following pressures in each cylinder:

1-90
2-90
3-90
4-100
5-90
6-96
7-95
8-95
Forum: Early V8 (1932-53) 01-08-2024, 08:18 PM
Replies: 206
Views: 17,162
Posted By Old Henry
Re: 47 V8 ignition mystery

Thanks for your suggestion. Early on I switched spark plugs around and it made no difference. In fact, I pulled the wires off the spark plugs and held them near head bolts and the intermittent...
Forum: Early V8 (1932-53) 01-08-2024, 06:16 PM
Replies: 206
Views: 17,162
Posted By Old Henry
Re: 47 V8 ignition mystery

Thanks for the thought. I have bypassed my coil resistor several times to see if it makes any difference. The problem is actually worse without the resistor which surprised me. It certainly didn't...
Forum: Early V8 (1932-53) 01-08-2024, 04:09 PM
Replies: 206
Views: 17,162
Posted By Old Henry
Re: 47 V8 ignition mystery

I recognized this pattern long ago which suggested a cock-eyed distributor cap. I removed the old worn gasket and installed the cap without one just to be sure it was absolutely flat. Again, it...
Showing results 1 to 25 of 500

 
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