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Topic: Stumble valve
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Page 1 of 1 of 19 replies
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June 06, 2012 at
02:50:09 PM
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on a sprint car where do you put a stumble valve and how do they work? Never heard of one till last week
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June 06, 2012 at
03:17:18 PM
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Plumb a "T" on the line BETWEEN the fuel pump, and main pill holder... Than off the "T" plumb a shut off valve, than the stumble valve. Than you can run it back to the tank, a fuel block, or "T" it back into the main pill holder line AFTER the main pill holder....
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June 06, 2012 at
05:57:54 PM
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can you explain the purpose other than the obvious
The greatest knowledge is to know that you know nothing
at all.
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June 06, 2012 at
06:06:54 PM
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The way I understand it.... You open the shut-off valve a lap before start/restart then close it soon after you take the green... Essentially its a backwards high speed, Its OPEN untill a set pressure, than it CLOSES.
I might have this all wrong.... I just had Tim send me one last week and have yet to plumb it up... It should cure all stumbling problems..
Alex Pettas
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June 06, 2012 at
10:11:50 PM
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Are you talking about a "Low Speed" bypass?
Never hit stationary objects!
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June 07, 2012 at
07:34:25 AM
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I've been running a stumble valve for about 13 years. It usually "opens up" after about 15 Coors Lights lol
do it in the dirt
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June 07, 2012 at
08:48:14 AM
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Reply to:
Posted By: Sprinter 79 on June 06 2012 at 10:11:50 PM
Are you talking about a "Low Speed" bypass?
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No it doesn't sound like it 79..Sounds like what they are doing is bleeding fuel thru a hose with no pill or spring in the line to get rid of more fuel at drop of green.Better hope the driver remembers to close it off!
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June 07, 2012 at
08:59:14 AM
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You could do the same thing with a dial-a-jet and save the extra plumbing.Just leave 1 hole in the dialajet empty,"no pill',and have the main pill you want to run in the hole next to it.Have the driver start on the empty hole then click it over to your main pill after taking the green.
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June 07, 2012 at
09:20:29 AM
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This message was edited on
June 07, 2012 at
09:23:08 AM by Sprinter 79
Doesn't that sound like a whole lot of extra work? I mean, man if the driver forgets to shut that back off you could have some real engine troubles. Also, wouldn't it just die if you tried to run it without a pill in a dial-a-jet. I know that if we try to run our low speed without a pill it just stumbles and dies. Then again our injection or our pump may not be working properly.
Never hit stationary objects!
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June 07, 2012 at
10:46:08 AM
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This message was edited on
June 07, 2012 at
10:47:37 AM by buzz rightrear
i don't know if i am understanding things correctly, but it seems simply having the driver close the fuel shut off a little going from the pump to the barrel valve would do the job. that is what we always did to take off if we were a little rich on idle and the car loaded up a bit on restarts.
the driver can control the fuel going to the motor by simply closing the fuel shut off a little. that also keeps system pressure up and creates back pressure against the fuel valve so the system can recover quickly when the valve is fully opened. the driver just leans the motor down on the yellow flag laps with the fuel shut off, then as they hit the throttle on the restart they open the valve back up.
no extra plumbing, and as i said it keeps system pressure up so you get a good shot to the nozzles when you open the valve back up under acceleration.
to indy and beyond!!
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June 07, 2012 at
10:46:50 AM
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Reply to:
Posted By: Pettas on June 06 2012 at 03:17:18 PM
Plumb a "T" on the line BETWEEN the fuel pump, and main pill holder... Than off the "T" plumb a shut off valve, than the stumble valve. Than you can run it back to the tank, a fuel block, or "T" it back into the main pill holder line AFTER the main pill holder....
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just found out from Engler. You do not need a shut off valve. You T of main pill feul line to the pill holder. You then T it back in behind main pill holder. Stumble valve only works at lower feul pressur. It closes as soon as pressure gets so high. Object is to bleed off excess fuel on restarts for a quicker restart. You can put a shut off valve on if you want to just run main pill. This would be true if engine was running hot on say a yellow flag. The main pill holder lets car run rich at low speeds. Stumble valve leans mixture for starts.
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June 07, 2012 at
11:58:54 AM
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Reply to:
Posted By: meatbag on June 07 2012 at 07:34:25 AM
I've been running a stumble valve for about 13 years. It usually "opens up" after about 15 Coors Lights lol
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Now that is very funny,,I like it...
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June 07, 2012 at
12:11:42 PM
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So what is the advantage to this over a low speed coming off the barrel valve?
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June 07, 2012 at
03:42:49 PM
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Reply to:
Posted By: 88sprint on June 07 2012 at 12:11:42 PM
So what is the advantage to this over a low speed coming off the barrel valve?
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The low speed bypass is not open and bypassing fuel as you are idleing around to take the green.It only comes in to play when you are running higher rpm's and then get off the throttle,until then you don't have enough fuel pressure to pop off the 35# spring in the low speed.I wonder how many of the people with the stumbling problem are using too heavy a spring in the main?
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June 08, 2012 at
12:04:51 AM
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Reply to:
Posted By: meatbag on June 07 2012 at 07:34:25 AM
I've been running a stumble valve for about 13 years. It usually "opens up" after about 15 Coors Lights lol
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LOL
Outlaw-Kart Crewchief
Sprint-Car Crewchief
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June 08, 2012 at
09:33:16 AM
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My question is why are they running the barrel valve so fat it won't take off? This open stumble valve is basically just leaning out the barrel valve when idling. Why not not just lean out the barrel itself a little? On our 360 we set it fat enough where the motor cools some on yellows but not so fat to cause a stumble on take off. If it cools off too much the driver just closes the shut off a little until ready for the restart. It seems to work fine. What am I missing?
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June 08, 2012 at
11:43:39 AM
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Reply to:
Posted By: MoOpenwheel on June 08 2012 at 09:33:16 AM
My question is why are they running the barrel valve so fat it won't take off? This open stumble valve is basically just leaning out the barrel valve when idling. Why not not just lean out the barrel itself a little? On our 360 we set it fat enough where the motor cools some on yellows but not so fat to cause a stumble on take off. If it cools off too much the driver just closes the shut off a little until ready for the restart. It seems to work fine. What am I missing?
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That is sort of where I was going with my previous question. It has only been recent years that I have heard of people putting a stumble valve on, seems like cars were ran for a lot of years without a stumble, so why aren't they running correctly now? It seems to me that something else is out of adjustment if you need to add this to make it take off??? Maybe I am wrong....I am sure someone will tell me if I am. Hopefully I don't have any grammar errors in my post either. HA!
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June 08, 2012 at
11:52:19 AM
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Reply to:
Posted By: 88sprint on June 08 2012 at 11:43:39 AM
That is sort of where I was going with my previous question. It has only been recent years that I have heard of people putting a stumble valve on, seems like cars were ran for a lot of years without a stumble, so why aren't they running correctly now? It seems to me that something else is out of adjustment if you need to add this to make it take off??? Maybe I am wrong....I am sure someone will tell me if I am. Hopefully I don't have any grammar errors in my post either. HA!
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I could point out a few grammatical errors, but I also realize that I'm dealing with a driver. 
Member of this message board since 1997
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June 08, 2012 at
02:00:23 PM
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Reply to:
Posted By: Hawker on June 08 2012 at 11:52:19 AM
I could point out a few grammatical errors, but I also realize that I'm dealing with a driver.
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LOL. I will remember that next time I find a fuzzy spot in one of your pics....
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June 08, 2012 at
06:28:01 PM
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Reply to:
Posted By: 88sprint on June 08 2012 at 11:43:39 AM
That is sort of where I was going with my previous question. It has only been recent years that I have heard of people putting a stumble valve on, seems like cars were ran for a lot of years without a stumble, so why aren't they running correctly now? It seems to me that something else is out of adjustment if you need to add this to make it take off??? Maybe I am wrong....I am sure someone will tell me if I am. Hopefully I don't have any grammar errors in my post either. HA!
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Don't know if there is any truth to what I'm about to say, but it's the little bit that (I think) I've been taught thus far....
If you were to lean out the barrel valve, it would hurt the top end power. In fact we are running ritcher on our barrel valve now than ever before. Before, It was about finding a balance between your top end power, and low end.. Everyone "delt" with it before, than ONE guy had something better than what everyone else had and now everyone uses it... I think the heads, cams, and injection has changed more in the last 6 years than the previous 20 years... I might be completley wrong with all of this... Like I said earlier, we just got a stumble valve last week and have yet to race with it. I just hope it helps clean up our starts... If anyone else has any thing they can teach, I'm all ears..
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