Backfiring going down hill
Forum rules
If you need help logging in, or have question about how something works, use the Support forum located here Support Forum
Complete set of Forum Rules Forum Rules
If you need help logging in, or have question about how something works, use the Support forum located here Support Forum
Complete set of Forum Rules Forum Rules
-
Topic author - Posts: 10
- Joined: Wed Jan 09, 2019 3:53 am
- First Name: Dennis K
- Last Name: Anderson
- * REQUIRED* Type and Year of Model Ts owned: 1927 Mail truck
- Location: Maryville TN
- MTFCA Number: 50262
- MTFCI Number: 23263
- Board Member Since: 2010
Backfiring going down hill
What makes a model t engine backfire going down hill. The throttle is all the way up. Is it carburetor or timing?
Dennis K Anderson
Maryville Tn
Dennis K Anderson
Maryville Tn
-
- Posts: 6430
- Joined: Sun Jan 06, 2019 11:18 am
- First Name: Scott
- Last Name: Conger
- * REQUIRED* Type and Year of Model Ts owned: '13, '15, '19, '23
- Location: Clark, WY
- Board Member Since: 2005
Re: Backfiring going down hill
Running very lean under those conditions. My Austin Healey would do that too, when downshifting. Never done that in the T.
Scott Conger
Tyranny under the guise of law is still Tyranny
NH Full Flow Float Valves
Obsolete carburetor parts manufactured
Tyranny under the guise of law is still Tyranny
NH Full Flow Float Valves
Obsolete carburetor parts manufactured
-
- Posts: 284
- Joined: Sun Jan 06, 2019 4:36 pm
- First Name: Don
- Last Name: Demio
- * REQUIRED* Type and Year of Model Ts owned: 1919 T
- Location: Tennessee
- MTFCA Number: 27167
- MTFCI Number: 20405
Re: Backfiring going down hill
Dennis,
I am not a mechanic just a parts changer. If you are referring to that beautiful Postal Truck you built I think the issue may be a loose nut behind the wheel buddy. Seroiusly, call me, I have a spare rebuilt carb you can borrow to see if yours needs to be rebuilt.
May best to Ms. Connie,
Dom
I am not a mechanic just a parts changer. If you are referring to that beautiful Postal Truck you built I think the issue may be a loose nut behind the wheel buddy. Seroiusly, call me, I have a spare rebuilt carb you can borrow to see if yours needs to be rebuilt.
May best to Ms. Connie,
Dom
Last edited by Don D on Tue Sep 28, 2021 12:16 am, edited 1 time in total.
-
- Posts: 4070
- Joined: Tue Jan 08, 2019 1:39 pm
- First Name: Norman
- Last Name: Kling
- Location: Alpine California
Re: Backfiring going down hill
If the spark is retarded going downhill, the spark will come late, causing some of the fuel to ignite in the manifold or muffler.
Norm
Norm
-
- Posts: 302
- Joined: Sun Jan 06, 2019 2:24 pm
- First Name: Bill
- Last Name: Robinson
- * REQUIRED* Type and Year of Model Ts owned: '21 Depot Hack, '25 Touring Car, '26 Roadster Pickup, '27 Tudor, & another '27 Tudor
- Location: Salty Bottom, ALABAMA AL
- MTFCA Number: 22487
- MTFCI Number: 17887
- Board Member Since: 1999
- Contact:
Re: Backfiring going down hill
Dennis- I'll bet that you are not running a standard Model T muffler. I'm running a muffler for an 8N tractor on most of my T's and they all backfire going downhill, but only if the timing is retarded. They are tough mufflers- much tougher than the Ford take-apart mufflers that are destroyed by a backfire.
When my granddaughter was young we'd be on a tour and I'd make the car backfire and she be in the back seat yelling "do it again, Poppy!"
Cows on the roadside hate it.
When my granddaughter was young we'd be on a tour and I'd make the car backfire and she be in the back seat yelling "do it again, Poppy!"
Cows on the roadside hate it.
-
- Posts: 2952
- Joined: Sun Jan 06, 2019 4:06 pm
- First Name: Jerry
- Last Name: Van
- Location: S.E. Michigan
- MTFCA Number: 24868
Re: Backfiring going down hill
Describe what you mean by "backfire". Do you mean explosions in the muffler, or "popping back" out of the carburetor? Each has a different cause.
-
Topic author - Posts: 10
- Joined: Wed Jan 09, 2019 3:53 am
- First Name: Dennis K
- Last Name: Anderson
- * REQUIRED* Type and Year of Model Ts owned: 1927 Mail truck
- Location: Maryville TN
- MTFCA Number: 50262
- MTFCI Number: 23263
- Board Member Since: 2010
Re: Backfiring going down hill
The backfiring is in the muffler. I am running one of those stainless steel mufflers. I don't think it will burst apart, but popping like that can't be too safe. Your commits are helpful and I will continue to chase this problem. Dom, I have been looking for that loose nut behind the wheel for a long time. Can't seem to find it. Thanks.
Dennis K Anderson
Maryville Tn
Dennis K Anderson
Maryville Tn
-
- Posts: 638
- Joined: Mon Jan 07, 2019 7:40 am
- First Name: CHARLIE
- Last Name: BRANCA
- * REQUIRED* Type and Year of Model Ts owned: "27 Tudor / "23 Touring
- Location: Brick N.J.
- MTFCA Number: 28967
- Board Member Since: 2010