It's all about the back fire...

[mr.modified]

Lets see your best back fire photos. Here's the best one I got so far. Stock 3 1/2hp briggs flat head. I had to hit the button on the camera just before I backed off on the throttle since there's quite a delay before it takes the picture. Photos probably look best at night of course.

 

[Le Plat]

My gift to you. Every pop was throwing flames but not all show on the vid in broad daylight.
‪Briggs Breaths Fire‬‏ - YouTube

Hope it works. Sadly this engine is having valve issues we need to fix

 

[HotRodDiesels]

Does this count?

 

[65ShelbyClone]

Wasn't a minibike, but it was a utility engine.

 

[C9H13NO3]

Wasn't a minibike, but it was a utility engine.

DAMN!

What was it??

 

[oldfatguy]

DAMN!

What was it??

I think we have a winner

 

[C9H13NO3]

I think we have a winner

Challenge accepted.

 

[oldfatguy]

Wasn't a minibike, but it was a utility engine.

I think that we have the winner

 

[65ShelbyClone]

DAMN!

What was it??

It was a Cushman Truckster with weak ignition on one cylinder, so it blew lots of air and fuel into the exhaust. Occasionally it would run-on and then backfire like a handgun. Anyone seen Uncle Buck? :1orglaugh:

 

[mmisterbungl]

‪volkswagen golf 900 bhp turbo dahlback‬‏ - YouTube

 

[mr.modified]

Nice. I tried for about 15 min to get a picture of my honda gc 160 back firing. Then I gave up and took a video...which I later erased by accident. :doah:

 

[novaracer]

‪volkswagen golf 900 bhp turbo dahlback‬‏ - YouTube

that it on purpose to cool the combustion chamber. not the best way to do it but it works. thats all in the ecu tuning and cam timing. i use hptuners for my car tuning. HPTuners.com >> Performance At Your Fingertips

 

[65ShelbyClone]

Like acceleration enrichment, there is also deceleration enrichment that is used to improve transient throttle response. It's good for exhaust fireballs in some very high performance applications. At the same time, auto manufacturers have been using "overrun fuel cut" since the advent of EFI in order to increase fuel economy. What it does is shut off the injectors completely under engine braking. That's why AFR gauges typically read off the lean end of the scale (20:1<) when decelerating with OEM injection systems.

On a side note toward the Dahlback Golf with a five-cylinder Audi engine....I love the sound of those odd-cylinder engines. The Group B rally Audis were incredible. The 1.5L supercharged triple Sea-Doos sound knarly too.

 

[mmisterbungl]

We need some sound!

‪Briggs animal night run‬&rlm; - YouTube

 

[Jeff Clark]

We need some sound!

‪Briggs animal night run‬&rlm; - YouTube

Cool mister..:smile:

 

[KustomKartKid]

 

[Modding_out]

My bikes don't back fire.....:shrug:

 

[mr.modified]

My bikes don't back fire.....:shrug:

I find that if an open pipe is too big, they won't backfire. Or sometimes where the carb is adjusted best for running, isn't rich enough for it to backfire. I've got to get some video of my 5 hp briggs db-30 at night...

 

[mr.modified]

Here's a view of the side pipe on my 5hp briggs powered DB-30 after dark.
Briggs back fire.wmv - YouTube

 

[mmisterbungl]

leave it to you to find something like this.:laugh: