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Old 06-10-2018, 11:19 PM   #1
mightynova63
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Default Motor won't run

I have a 1928 sport coupe that I'm trying to get running. I 99.9% sure on the timing 99.9% on the carb I rebuild and I have good compression. I replaced the oil pump drive gear that was extremely worn, installed an updated pionts system and rebuilt the carb. The motor is spitting and sputtering but won't kick over. The head is getting warm and the plugs are kinda dry. It has plenty of turning power with the 12v upgrade. Right now I'm leaning that the carb is not feeding the right fuel flow or the coil is not powerful enough. Any help will be great.

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Old 06-10-2018, 11:54 PM   #2
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Default Re: Motor won't run

An updated ignition system congers up mixed pictures in my mind.
I have successfully got original configured motors going using the basic parts then I could start modifying. A picture of your project motor would give us a place to start from.
You can test for spark and good fuel flow as a starting point.
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Old 06-11-2018, 12:45 AM   #3
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Default Re: Motor won't run

if it is fuel it will run ok on a shot of starting fluid.
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Old 06-11-2018, 12:51 AM   #4
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Default Re: Motor won't run

I don't have a pic of the distributor but is is a normal nu-rex system.

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Old 06-11-2018, 01:00 AM   #5
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Default Re: Motor won't run

I have spark but still nothing with starting fluid other then spitting and sputtering. I have built race cars for over 20 years and this little motor is killing me lol. I have spark, compression and fuel it should run but nothing.

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Old 06-11-2018, 01:06 AM   #6
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Default Re: Motor won't run

Need a good spark at the right time.
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Old 06-11-2018, 01:30 AM   #7
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Default Re: Motor won't run

Did you set the timing with the lever set to full advance and not full retard
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Old 06-11-2018, 01:45 AM   #8
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Default Re: Motor won't run

Full retard

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Old 06-11-2018, 05:22 AM   #9
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Default Re: Motor won't run

If it wont start with starter fluid then it is not a fuel problem. Sputtering and just won't catch tells me timing.


http://www.abarnyard.com/workshop/timing.htm
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Old 06-11-2018, 07:46 AM   #10
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Default Re: Motor won't run

Could the timing somehow be 180 degrees off?
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Old 06-11-2018, 08:40 AM   #11
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Default Re: Motor won't run

Pull the side timing gear cover and check the condition of the large timing gear.
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Old 06-11-2018, 09:10 AM   #12
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Default Re: Motor won't run

Quote:
Originally Posted by mightynova63 View Post
I have spark but still nothing with starting fluid other then spitting and sputtering. I have built race cars for over 20 years and this little motor is killing me lol. I have spark, compression and fuel it should run but nothing.

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where do you have your GAV at if it's closed?

open the GAV up about a full turn and see what happens
had one that would not run tell i did that

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Old 06-11-2018, 09:16 AM   #13
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Default Re: Motor won't run

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Originally Posted by mightynova63 View Post
Full retard

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Spark lever should be all the way up when setting timing
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Old 06-11-2018, 10:05 AM   #14
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Default Re: Motor won't run

The gear is good.

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Old 06-11-2018, 10:19 AM   #15
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Default Re: Motor won't run

If the timing pin drops into the cam gear dimple, and your rotor is in this exact position, then the timing is great. Your points gap looks good.
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File Type: jpg Timing Rotor Position.jpg (66.7 KB, 40 views)
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Old 06-11-2018, 11:40 AM   #16
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So it looks close. I'll check that when I get home but that's a picture I took yesterday.

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Old 06-11-2018, 12:01 PM   #17
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Default Re: Motor won't run

[QUOTE=mightynova63;1638921]So it looks close. I'll check that when I get home but that's a picture I took yesterday.

Looks like it could arc from the condenser nut through the rotor contact to the #1 plug contact.

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Old 06-11-2018, 12:01 PM   #18
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Is the fuel line pushed too far into the carb?
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Old 06-11-2018, 03:36 PM   #19
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Default Re: Motor won't run

After re reading other posts I see that you have spark so this info is not needed ...


Is this nut OR any tabs, lugs or wires attached to it below touching or very close to the dist casting?

Can not post photo with arrow pointing to part ...

Referring to photo in post 16 with orange wire.

Talking about the NUT under the brass part of the rotor ....
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Old 06-11-2018, 03:44 PM   #20
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Default Re: Motor won't run

Quote:
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Pull the side timing gear cover and check the condition of the large timing gear.
does the timing gear spin when you crank the engine
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Old 06-11-2018, 03:54 PM   #21
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Default Re: Motor won't run

Did you remember to tape the original condenser tab on the lower dist. plate.
Here is the Nu Rex video link. Keep us posted, Chap
https://www.youtube.com/watch?v=3txC9E4mlp0&t=27s
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Old 06-11-2018, 04:53 PM   #22
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Default Re: Motor won't run

From the pics you don't have the fuel adj (GAV) rod in place to adj the GAV. Have you tried opening it manually?? Disc the fuel line and look for a GOOD solid fuel mflow.
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Old 06-11-2018, 06:35 PM   #23
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Default Re: Motor won't run

When my A would not start I found that there was a ground in the distributor.
A slight adjustment and it was OK
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Old 06-11-2018, 10:23 PM   #24
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Default Re: Motor won't run

After work I went to a buddy of mine who has a 31 that we just completed a 12v conversation on. His car to has not ran in 30+ years. We completed the wiring and was able to start it for the first time. That being said I know I'm doing the timing right. My new concern is that his motor turns over considerably slower than mine. With my experience this is telling me that my compression is lower then his and may possibly be my problem. If I have a bad head gasket I may be leaking between cylinders causing the back firing through the intake.

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Old 06-11-2018, 10:56 PM   #25
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Default Re: Motor won't run

What is your compression read? Maybe you have sticky valves or broken springs.
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Old 06-11-2018, 11:22 PM   #26
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Quote:
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What is your compression read? Maybe you have sticky valves or broken springs.
Good call!
Sticky valves or broken springs would cause spitting and back fire would it not?

Lower compression also as does Post 24 and leak between two cylinders !
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Old 06-12-2018, 09:18 AM   #27
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Default Re: Motor won't run

I would take a fresh look at everything. Timing looks good per pics, check compression in each cylinder with a compression tester, just takes a few minutes and gives you a ton of info. Lift the spark plug wires a 1/4 inch and crank it to check for nice hot spark, put your hand over air intake and crank to see if gas is there. If all this tests out, it should run.
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Old 06-12-2018, 10:47 PM   #28
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I made a simple Press On adapter for a 0 to 100 PSI gauge and tested all four cylinders. Each cylinder has between 25 and 35 PSI

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Old 06-13-2018, 12:15 AM   #29
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Wow, thats not much. Time to see if its valves or ?? If it was headgasket should only be a couple cylinders. Pull the head and look it over. Lapping the valves isn't too big of a job. Be careful if the head is stuck, you can wreck stuff by driving in screwdrivers and prying.
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Old 06-13-2018, 12:56 AM   #30
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The timing gear could be off a tooth or two. You should see more compression than what you have. Did you test with some oil in the cylinders for sealing?
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Old 06-13-2018, 10:34 AM   #31
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Default Re: Motor won't run

I did not pour any oil in at that time. I did pour oil in prior to trying to rotate the engine over for the first time.

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Old 06-13-2018, 10:36 AM   #32
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how long has this motor been sitting?
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Old 06-13-2018, 10:48 AM   #33
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Prior to my purchase of the car maybe 30-40-50 years. I think my goal to try and get it running as a survivor may be lost.

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Old 06-13-2018, 10:56 AM   #34
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Default Re: Motor won't run

Pull the manifolds and valve chamber cover and "squirt" the valve guides liberally with PB blaster or equivalent and hand crank till you get the valves freed up. JMO
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Old 06-13-2018, 11:14 AM   #35
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I have been in the valve cover when I changed out the oil pump drive gear all of the valves move great and there was no sticking valves. When trying to start the motor the oil fill spout cap pops open from the crank case pressure. I believe that I may have bad rings. Or cylinder walls are worn out.

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Old 06-13-2018, 11:52 AM   #36
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I think you need to get a proper compression gauge so it will hold the pressure
for a few revolutions.


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Old 06-13-2018, 12:02 PM   #37
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Sticky rings?
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Old 06-13-2018, 12:21 PM   #38
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Default Re: Motor won't run

Quote:
Originally Posted by mightynova63 View Post
I have a 1928 sport coupe that I'm trying to get running. I 99.9% sure on the timing 99.9% on the carb I rebuild and I have good compression. I replaced the oil pump drive gear that was extremely worn, installed an updated pionts system and rebuilt the carb. The motor is spitting and sputtering but won't kick over. The head is getting warm and the plugs are kinda dry. It has plenty of turning power with the 12v upgrade. Right now I'm leaning that the carb is not feeding the right fuel flow or the coil is not powerful enough. Any help will be great.

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You did a lot of changes to this car! The one that stands out is ignition changes. The car is spitting back. head is warm, which to me converts to the engine is really out of time. Get # 1 piston at the top on compression stroke. There are plenty of posts on how to accomplish. Then assure your distributor is set up to fire on #1 and that the distributor wires (brass flat wires) are going to the right spark plugs. Once that is complete and you are sure you have the engine timed right, then do the starting thing again. Hope this helps
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Old 06-13-2018, 12:23 PM   #39
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Default Re: Motor won't run

Bob C is right. 35 with the reading going back to "0"each time is not a compression reading as such. A compression tester has a chack valve so the second and third and fourth hits accumulate for the final reading. Then you release the reading and go on to the next hole. Tool shouldn't cost more than $30 $45. Write down the readings and then do it again wet ( 2-3 squirts motor oil).
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Old 06-13-2018, 12:28 PM   #40
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Time to remove the head and take a look at the gasket and rings...remove the nuts and soak the head bolts with pb blaster or Marvel Mystery Oil for a couple of days and then remove the head...if the problem is mechanical, you'll learn quite a bit by taking a look. Make sure your pan is clean and the little pipes that go from the value area to the mains seem to be free of junk. Take the timing gear cover off and take a look, turn the engine over with the crank and then you should know if you have a mechanical problem. If the timing is good, take the carburetor apart and clean it out...Make sure all you cable connections are clean and tight. Take the dash panel off and make sure the nuts on the amp meter and ignition switch are clean and tight. Ernie
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Old 06-13-2018, 12:43 PM   #41
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The things that Ernie is saying are good, but for later. Don't ever pull the head before you know what the compression is.One exception on his list is running the engine for any period of time with potential trash and metal in the pan. Just changing the oil won't remove trash, pan got to come off. Ok to get to stsrt and that is going to require a suitable tester.
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Old 06-13-2018, 01:15 PM   #42
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If you do indeed have low compression then you should do a leak down test
to see where the problem is.


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Old 06-13-2018, 02:52 PM   #43
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Default Re: Motor won't run

Yeah, compression gauge needs schrader valve to be accurate, but most important is consistent readings across all cyls. Oil test if there is a difference to determine rings or valves at fault.

Back to coil - I assume you replaced both coil and dist. wire when you converted to 12V, so not likely to be the problem... Disconnect the battery and check the resistance across the ignition switch, should be nearly zero ohms. Could be the contacts are corroded, which would cause a weak spark.

What a beautiful car! When you get it ticking, polish up that rust and go! Around here you'd need a front bumper and horn to be legal, though. Brake light would be a plus.
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