What's the differance... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Longhorn Man · 11-07-2005, 11:12 PM

I got a PM asking this, and I (think) I have it down...but was unable to put it into words....

What is the differance between a bog and a stumble?

Green Machine · 11-07-2005, 11:19 PM

I think a bog is a more severe form of stumble ??? Like maybe when it bogs, it doesn't hit on any cylinders for a while, a stumble is less severe, like maybe it hits on a few holes, for a shorter time, then recovers ???

shifty · 11-07-2005, 11:31 PM

i always thought a bog is when it was firing on all cylinders but the RPM's are low so it's running really "chunky" whereas a stumble would constitute misfiring or backfiring.

shoot me if i'm wrong.

69TowRig · 11-07-2005, 11:38 PM

Quote:

Originally Posted by shifty

i always thought a bog is when it was firing on all cylinders but the RPM's are low so it's running really "chunky" whereas a stumble would constitute misfiring or backfiring.

shoot me if i'm wrong.

When I go 4-wheelin' I bog the engine down when climbing hills sometimes (too steep!). When my buddies get water in their distributors from muddin' their engines stumble.

Longhorn Man · 11-07-2005, 11:52 PM

well ok, let me clerify.... bogging I am refering to is more like an off the line bog, when you are running too rich.... a stumble is supposed to be when you're too lean.
How does one tell a bog from a stumble?

hotrodmtodd · 11-08-2005, 12:30 AM

Andy,
This is how I see what you are asking. A bog is when the engine is getting more fuel than the RPMs can compensate for. (which is basically what towrig is saying in his particular case. (too high of a gear for the RPMs) A stumble is more of a lean condition problem, because you stomp the gas, and it takes a second for the fuel delivery system to catch up to the needs of the engine at a particular RPM. If I was going to describe it in a "sound",(don't laugh) it would be the difference between a "bowah"(bog) and a "phitwah"(stumble) You said you wouldn't laugh.... Just trying to put it in the simplest terms, since you asked. Take care, Mike

sdkid · 11-08-2005, 01:38 AM

Here's my take...

Stumble=lasts only a second, comes out of it, without getting out of the throttle.

Bog=Continues to pull down until you get out of the throttle.

Does that make sense to anyone besides me?

chevy_fatman · 11-08-2005, 01:47 AM

I think sdkid nailed it dude! but what do I know?

Russell · 11-08-2005, 03:32 AM

Bogging to me is working extremely hard, but not getting anywhere, while a stumble is going like crazy, but misfiring for a second or something.

11-07-2005, 11:12 PM	#1
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	What's the differance... I got a PM asking this, and I (think) I have it down...but was unable to put it into words.... What is the differance between a bog and a stumble?

11-07-2005, 11:19 PM	#2
Green Machine Senior Member Join Date: Jul 2004 Location: Estherville, Iowa Posts: 3,371	Re: What's the differance... I think a bog is a more severe form of stumble ??? Like maybe when it bogs, it doesn't hit on any cylinders for a while, a stumble is less severe, like maybe it hits on a few holes, for a shorter time, then recovers ??? __________________ 1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0

11-07-2005, 11:31 PM	#3
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,376	Re: What's the differance... i always thought a bog is when it was firing on all cylinders but the RPM's are low so it's running really "chunky" whereas a stumble would constitute misfiring or backfiring. shoot me if i'm wrong. __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.

11-07-2005, 11:52 PM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: What's the differance... well ok, let me clerify.... bogging I am refering to is more like an off the line bog, when you are running too rich.... a stumble is supposed to be when you're too lean. How does one tell a bog from a stumble?

11-08-2005, 12:30 AM	#6
hotrodmtodd 'Burban Legend Join Date: Apr 2005 Location: Mingo Junction OH Posts: 918	Re: What's the differance... Andy, This is how I see what you are asking. A bog is when the engine is getting more fuel than the RPMs can compensate for. (which is basically what towrig is saying in his particular case. (too high of a gear for the RPMs) A stumble is more of a lean condition problem, because you stomp the gas, and it takes a second for the fuel delivery system to catch up to the needs of the engine at a particular RPM. If I was going to describe it in a "sound",(don't laugh) it would be the difference between a "bowah"(bog) and a "phitwah"(stumble) You said you wouldn't laugh.... Just trying to put it in the simplest terms, since you asked. Take care, Mike __________________ '67 Chevy Iron City Beer Truck (9ft step) '67 Chevy Panel Truck 467 '68 Short Fleet 305v6 '68 McLaren Ramp Truck '68/'68/'70/'71 Burbs 292/366/402/454 '69 C-30 dump '71 C-50 dump and church bus '71 4x4 454 '72 Blazer (w/pop-up camper) $15 x-hooks '66 Chevy II 194/Weber '68 El Camino" 305v6 '69 Skylark 455 Buick '70 Chevelle 427 '71 Cutlass W-31 '71 GTO 400 2x2 "The 51" Chopped '51 Chevy (409) my first car OK Toad, we'll take 'em all... John Milner

11-08-2005, 01:38 AM	#7
sdkid Registered User Join Date: Sep 2004 Location: Pierre SD Posts: 1,533	Re: What's the differance... Here's my take... Stumble=lasts only a second, comes out of it, without getting out of the throttle. Bog=Continues to pull down until you get out of the throttle. Does that make sense to anyone besides me? __________________ I think the world needs a drink... Help somebody...If you can....VanZant We're not wrong, we're not sorry, and its probably gonna happen again. That's the truth about men. Tracy Byrd Member# 13924 '70 c10, 350/350 '68 c10 250/4spd '68 c10 no eng/trans fac ps/pb/ac/at (future father/sons project) '48 Chevy Loadmaster

11-08-2005, 01:47 AM	#8
chevy_fatman Where's my beer? Join Date: Aug 2002 Location: I live in the state of denial.... Posts: 5,621	Re: What's the differance... I think sdkid nailed it dude! but what do I know?

11-08-2005, 03:32 AM	#9
Russell Professional Grade Join Date: May 2003 Location: Fort McMurray, Alberta Posts: 7,915	Re: What's the differance... Bogging to me is working extremely hard, but not getting anywhere, while a stumble is going like crazy, but misfiring for a second or something. __________________ 1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap)



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