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Old 06-10-2021, 11:21 PM   #1
hope
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Default break-up at WOT

i know i saw a discussion before on this subject, but ran it thru SEARCH and didn't come up with anything.
So i'm asking what's the cause of Break-up at WOT.


Thanks: to all the people with the Knowledge.




HOPE
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Old 06-11-2021, 12:07 AM   #2
J Franklin
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Default Re: break-up at WOT

When I look up WOT I get world of tanks, is that anything to worry about?
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Old 06-11-2021, 03:48 AM   #3
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Default Re: break-up at WOT

Wide open Throttle?
If so it might indicate a lack of gas or a collapsing spark due to the higher compression
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Old 06-11-2021, 06:34 AM   #4
Bored&Stroked
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Default Re: break-up at WOT

Depends on how high WOT is . . . can be a lot of things . . . and different depending on the engine, components, tuning and other specs.

It can be fuel starvation, it can be ignition points that are floating, it can be valves that are floating . . . it can be various other ignition or fuel issues.

So what RPM are we talking about and what are the specs on the engine???

Last edited by Bored&Stroked; 06-11-2021 at 08:15 AM.
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Old 06-11-2021, 06:41 AM   #5
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Default Re: break-up at WOT

wot sounds like tranny etc
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Old 06-11-2021, 06:42 AM   #6
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Default Re: break-up at WOT

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I have experienced problems where a misfire would occur at wide open throttle.
In my case at least it was associated with weak High Tension side of then ignition.
The amount of voltage required to make the spark jump the gap goes up as the compression pressure gets higher in the cylinder. At wider pedal angles the voltage requirements are at their highest.
All the time the spark is trying to find the easiest way to ground. If there is a weakness in the HT side of the ignition the spark will take that route and not fire the plug.
In my experience the problem gets worse until the car becomes undriveable.
Once all has cooled down you can generally make way again until it occurs again.
I'd be looking at distributor cap, leads and rotor arm.
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Old 06-11-2021, 08:33 AM   #7
1931 flamingo
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Default Re: break-up at WOT

No help on the question.


Did you get the brakes fixed???
Paul in CT
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Old 06-11-2021, 10:44 AM   #8
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Default Re: break-up at WOT

What RPM?
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Old 06-11-2021, 02:46 PM   #9
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Default Re: break-up at WOT

RPM will have to wait until i get to a trial run again. Did not notice rpm break-up the last time.
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Old 06-11-2021, 03:10 PM   #10
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Default Re: break-up at WOT

Quote:
Originally Posted by 1931 flamingo View Post
No help on the question.


Did you get the brakes fixed???
Paul in CT
Brakes not fixed yet, i do try different things when i can. But other things come first, like coil getting boiling (burning hot).
I think i finally found the right combination, with a Bosch coil, a trash can condenser and the right resistor.
After a trial run ,coil was only luke warm to touch and NOT burning. And not stalling.

And now on to the brakes and WOT problems. When i can!!!!!!!!!!! i can cope with the problem of movement, but my Brain at 85 is going-going almost gone.


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Old 06-11-2021, 07:44 PM   #11
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Default Re: break-up at WOT

I think it is fantastic that you're giving it a solid go at 85 - so more power to yah! If I was anywhere close to you, I'd lend a hand. If the BARN can help in any way, just ask. If you need some personal help, feel free to drop me a PM. Best of luck - you'll be cruising with it soon!
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Old 06-12-2021, 03:17 AM   #12
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Default Re: break-up at WOT

May I add that the problems I was describing are not at high revs. It's at wider throttle openings at lower revs. That's when the HT weakness shows up.
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Old 06-12-2021, 10:42 AM   #13
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Default Re: break-up at WOT

Had similar problems. Replaced spiral wound ignition wires with solid copper and reset spark plug gap from 0.035 to 0.025". That cured the high rpm breakup, but the lack of static suppression in copper wires completely jammed my radio. So, I went back to a short spiral wound wire only for coil to distributor. That got the radio back and it still revs smoothly to near 5,000 rpm.
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Old 06-12-2021, 11:44 AM   #14
J Franklin
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Default Re: break-up at WOT

Now that I am back on track I agree with drolston's experience. That is a symptom of bad plugs, cap, or wires. I was taught that in auto shop class in high school. More compression directly affects ignition.
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Old 06-12-2021, 07:04 PM   #15
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Default Re: break-up at WOT

Replace the points.
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Old 06-12-2021, 10:06 PM   #16
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Default Re: break-up at WOT

Quote:
Originally Posted by Bored&Stroked View Post
I think it is fantastic that you're giving it a solid go at 85 - so more power to yah! If I was anywhere close to you, I'd lend a hand. If the BARN can help in any way, just ask. If you need some personal help, feel free to drop me a PM. Best of luck - you'll be cruising with it soon!
Thanks for the thought of helping, BUT i think with the help from the BARN i'll eventually conker these gremlins, i've already got a lot of help from the Barn.


Like the Gunny says :Carry-on:


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Old 06-12-2021, 10:07 PM   #17
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Default Re: break-up at WOT

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Originally Posted by Kidwalt View Post
Replace the points.

Thanks.
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Old 06-12-2021, 10:08 PM   #18
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Default Re: break-up at WOT

Quote:
Originally Posted by J Franklin View Post
Now that I am back on track I agree with drolston's experience. That is a symptom of bad plugs, cap, or wires. I was taught that in auto shop class in high school. More compression directly affects ignition.

Thanks.
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