Go Back   The Ford Barn > General Discussion > Early V8 (1932-53)

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Display Modes
Old 09-25-2020, 09:21 AM   #21
Brian King
Member
 
Join Date: Jan 2014
Location: Napa, CA
Posts: 50
Default Re: new engine start-up problems

I agree - weak/improper ignition will allow the plugs to be wet.
Two ideas come to mind: either throw another crab distributor on there, or throw another intake on there (stock with a single carb.
Another distributor sounds easiest at this point.
Brian King is offline   Reply With Quote
Old 09-25-2020, 09:27 AM   #22
joe 1950
Senior Member
 
Join Date: Mar 2013
Location: Green Bay Wi
Posts: 275
Default Re: new engine start-up problems

Do you have good blue spark at the plugs
joe 1950 is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 09-25-2020, 09:49 AM   #23
glennpm
Senior Member
 
glennpm's Avatar
 
Join Date: Sep 2014
Location: Wiscasset, Maine
Posts: 925
Default Re: new engine start-up problems

Pull any plug. Ground the plug to the block. See if you have a spark from spark center electrode to the side ground electrode.
glennpm is offline   Reply With Quote
Old 09-25-2020, 10:21 AM   #24
Step-down
Senior Member
 
Step-down's Avatar
 
Join Date: May 2012
Location: Hat City (Danbury CT)
Posts: 577
Default Re: new engine start-up problems

For guys like myself I always start with a single carburetor, narrowing down the confusion and break-in.
__________________
"I can't cry as long as I know the Lord has risen "
Step-down is offline   Reply With Quote
Old 09-25-2020, 12:35 PM   #25
Chris Marshall
Senior Member
 
Chris Marshall's Avatar
 
Join Date: May 2010
Location: Overbrook, Ks
Posts: 140
Default Re: new engine start-up problems

Here's a long shot. A malfunctioning tach can cause all kinds of odd ignition issues. Disconnect the tach and give it a try.
Chris Marshall is offline   Reply With Quote
Old 09-25-2020, 12:51 PM   #26
tubman
Senior Member
 
tubman's Avatar
 
Join Date: Dec 2013
Location: Minnesota, Florida Keys
Posts: 6,678
Default Re: new engine start-up problems

Sponsored Links (Register now to hide all advertisements)
Quote:
Originally Posted by Chris Marshall View Post
Here's a long shot. A malfunctioning tach can cause all kinds of odd ignition issues. Disconnect the tach and give it a try.
Maybe not such a long shot; I had this exact thing happen to me.

From my long experience with fouled plugs in snowmobiles, I don't think it would be a bad idea to buy a fresh set of plugs to try.
tubman is offline   Reply With Quote
Old 09-25-2020, 04:36 PM   #27
Don
Senior Member
 
Don's Avatar
 
Join Date: May 2010
Location: Ashland KY
Posts: 1,099
Default Re: new engine start-up problems

Change out rotor,,easy to do,,had same problem but using single carb,,,
__________________
DON P
Don is offline   Reply With Quote
Old 09-26-2020, 03:28 PM   #28
Ggmac
Senior Member
 
Join Date: Jul 2016
Location: Lake worth Florida
Posts: 565
Default Re: new engine start-up problems

[QUOTE=Brian King;1934985]OK here is the latest:
-Unplugged the outer carbs and then covered their inlet with tape.
-Checked voltage at the coil and it's got 9 volts.
-Tried to fire again but it acted exactly the same.
-Cut the pressure regulator to it's lowest setting (.5 lbs) and even drained the bowls of the outside carbs.
-Just like last night, it goes from firing and sputtering for 10 secs to nothing on about a half dozen attempts.
-Plugs look wet, but not sure that tells me anything since it's pumping fuel but not firing - of course they're wet.

And no I am not running stainless from the firewall to the carbs. I bought one of Charlie Price's stainless lines that comes from the mechanical fuel pump (with the regulator in between).
Tape is not a good choice ! A little fuel oe vapor will cause the glue to go by by and the tape could be sucked into the motor . Did you disconnect the progressive linkage when first trying the tape ? If its not the tach causing problems I still think its TOO MUCH fuel . It starts normal and after 10 seconds it goe to crap , tells me its spark and plugs are ok for the first start up then it floods . Take the outer 2 carbs off , it doesnt take much to wash the cylinders out requiring rings or at least a rehone .
Ggmac is offline   Reply With Quote
Old 09-27-2020, 11:08 PM   #29
Brian King
Member
 
Join Date: Jan 2014
Location: Napa, CA
Posts: 50
Default Re: new engine start-up problems

I only used tape to cover the velocity stacks, not down on the intake where it could be sucked in. Besides, there are screens on the mouths of the carbs.

Worked on it some this weekend, though I let myself get distracted with other chores on a new build (ie: bleeding brakes, greasing zercs, etc.). But I did:
- completely disconnected both outer carbs from the fuel line
- checked the needle/seat in the center barb (not plugged)
- checked spark (looks to be good)
- disconnected tach
I too have to believe it is too much fuel. Tomorrow I'll pull the center carb and have a look.
I can't slap another distributor on there - had to machine this one to accept an altered spacer plate...this is what happens when you mistakenly put an early came in a later motor and the crab won't seat.
Brian King is offline   Reply With Quote
Old 09-27-2020, 11:21 PM   #30
JSeery
Senior Member
 
JSeery's Avatar
 
Join Date: Nov 2012
Location: Wichita KS
Posts: 15,080
Default Re: new engine start-up problems

Just taping the top of the outside carbs will not stop a fuel or air leak. You need to block off the manifold with something solid, like a thin metal plate. You can slip it between the carbs and the manifold.
JSeery is offline   Reply With Quote
Old 09-28-2020, 07:28 AM   #31
glennpm
Senior Member
 
glennpm's Avatar
 
Join Date: Sep 2014
Location: Wiscasset, Maine
Posts: 925
Default Re: new engine start-up problems

Hi,


Regarding "I can't slap another distributor on there - had to machine this one to accept an altered spacer plate... this is what happens when you mistakenly put an early came in a later motor and the crab won't seat"



Are you sure that you have your distributor mounted correctly with the rotor pointing to #1 on the cap for the power stroke? Not sure if your spacer would change how the crab tang mounting would be affected.


I had questions about finding #1 power stroke and there are good methods in this thread:


https://www.fordbarn.com/forum/showt...ht=TDC+glennpm
glennpm is offline   Reply With Quote
Old 09-28-2020, 06:15 PM   #32
Ggmac
Senior Member
 
Join Date: Jul 2016
Location: Lake worth Florida
Posts: 565
Default Re: new engine start-up problems

What Jseery said ! Leave the center carb , remove the 2 outer carbs by butting aluminum or something solid between the carb and manifold. By just taping the top of the carb you made it worse , now its just suckingfuel , unless you emptied the bowls and disconnected the lines . Reducing the fuel press isnt good enough.
Ggmac is offline   Reply With Quote
Old 09-29-2020, 12:17 AM   #33
Brian King
Member
 
Join Date: Jan 2014
Location: Napa, CA
Posts: 50
Default Re: new engine start-up problems

I gotta try and capture everything I've tried here:
-all 3 carbs disconnected from fuel lines
-spark is strong
-advanced the crab distributor
-checked and rechecked firing order
-rehooked up center carb only and it ran for about 30-45 seconds before finally succumbing to my tuning.
-backfired like a son of a gun. I could never get it to clear out.
Sooo..... it HAS to be ignition! Tomorrow I'll run a compression check to make sure we are ok there. For the life of me I can't figure out the backfire.
Brian King is offline   Reply With Quote
Old 09-29-2020, 06:09 AM   #34
glennpm
Senior Member
 
glennpm's Avatar
 
Join Date: Sep 2014
Location: Wiscasset, Maine
Posts: 925
Default Re: new engine start-up problems

"Are you sure that you have your distributor mounted correctly with the rotor pointing to #1 on the cap for the power stroke? Not sure if your spacer would change how the crab tang mounting would be affected."
glennpm is offline   Reply With Quote
Old 09-29-2020, 09:08 AM   #35
Brian King
Member
 
Join Date: Jan 2014
Location: Napa, CA
Posts: 50
Default Re: new engine start-up problems

Checked and triple checked that the distributor is pointed at #1 when the thumb blows off #1 spark plug hole. The spacer should make no difference.
It acts as if the cam is off a tooth, to be honest. But not sure how I could have screwed that up during assembly - all you have ot do is line up the dots when installing the cam gear.
Hopefully the compression test today doesn't reveal anything.....
Brian King is offline   Reply With Quote
Old 09-29-2020, 09:09 AM   #36
glennpm
Senior Member
 
glennpm's Avatar
 
Join Date: Sep 2014
Location: Wiscasset, Maine
Posts: 925
Default Re: new engine start-up problems

Good Brian, thanks for the reply.
glennpm is offline   Reply With Quote
Old 09-29-2020, 09:12 AM   #37
Mart
Senior Member
 
Mart's Avatar
 
Join Date: May 2010
Location: Solihull, England.
Posts: 6,721
Default Re: new engine start-up problems

The fuel regulator set to 0.5 lbs might not actually be delivering any fuel. Set it to about 2 lbs.
Mart is offline   Reply With Quote
Old 09-29-2020, 11:00 AM   #38
Brian King
Member
 
Join Date: Jan 2014
Location: Napa, CA
Posts: 50
Default Re: new engine start-up problems

I took the pressure regulator off. Just a mechanical pump feeding directly to one carb.
Whether I had all three carbs or one on, or whether I had a pressure regulator or not, or whether I poured gas in from the top or pumped it in.....it all acted the same. Thus ignition(?)
Brian King is offline   Reply With Quote
Old 09-29-2020, 11:28 AM   #39
JSeery
Senior Member
 
JSeery's Avatar
 
Join Date: Nov 2012
Location: Wichita KS
Posts: 15,080
Default Re: new engine start-up problems

Another long shot, there were a couple of post about timing gears being mismarked. Not sure if they just thought they were mismarked or they actually were mismarked.

I don't remember, but have you run a compression test? A valve sticking might lead to a backfire.

Also, depending on the carb type, a backfire can damage the power valves and cause them to leak.
JSeery is offline   Reply With Quote
Old 09-29-2020, 03:10 PM   #40
glennpm
Senior Member
 
glennpm's Avatar
 
Join Date: Sep 2014
Location: Wiscasset, Maine
Posts: 925
Default Re: new engine start-up problems

He plans to run a compression check today from post #35
glennpm is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 03:09 AM.