seems like the only RX-7s i see doing the flame spewing are FC and FD...isn't the FB capable of this as well?? what is necessary to get my 12A to do it? (i can hear some slight backfiring when off the throttle in 2nd gear around 4,000-5,000rpm...)

 

yea a 12A can make flames. if its getting a healthy supply of fuel and has a straight thru exhaust you should get some nice flames when you let off the gas. i got mine to shoot a little flames stock with the RB presilencer and muffler, which isnt straight thru.

 

are you talking about flames from the exhauste.....? if you are then you need to buy a kit that allows you to split a spark plug wire to run back to you tail pipe which ignites the excess fuel, providing a cleaner and neater ride, there are choke kits which is like a mini carb you install on your exhauste which can throw flames upto 40 ft or so, i cant remeber the site off hand that provides these kits but ill post it if you want me to.


hopefully this is what your were talking about

 

Rx-7's don't need a kit to throw fire....

 

fa sho

 

Adjust your car to run very rich... i guess my AFM (EFI of course) on my car went out causing mine to run rich, i'd let go of the gas and it'll still dump fuel into the engine, as soon as i tapped the gas it sounded like a 12 gauge being fired with a huge flame to accompany it.

 

get a full exhaust (strait through), fuel system and rejet the carb.

Great for that *** hole thats riding your ***.

 

We can shoot flames until our exhausts EXPLODE!


8 months later, still driving it like that.

 

this topis has come up alot lately..

but yeah run ur car rich.. and redline it in 2nd for a few secondds then let go and it should fire..

or if ur cars running **** like mine and the trailing plugs are hardly working it will back fine every 2 seconds..

i got a nice video of mine throwing a few shots. i will try and upload em ..

 

 

Backfiring is caused by unburned fuel going through the exhaust and burning in the last muffler (or somehere in between, but then you only get a bang, no flame)
It's basicly the evidence that you are doing something wrong. Fuel is supposed to burn INSIDE the engine, not in the exhaust. Appart from the fact that it can blow up your exhaust (see above) it's also pretty silly to to burn fuel without making any power out of it. An overly rich running engine is making way less power then a engine running as poor as you possibly can (without damaging the engine of course, that 'd be TOO poor, which again is stupid). It's not uncommon for RX7's to have backfiring during warm up, which is caused by the overlap between intake and exhaust in combination with enrichment during warm-up cycle. If it keeps backfiring all the time you're running too rich, or have a faulty ignition timing.
Deliberately causing a car to spit flames is more rice then any other thing I know. Sorry, but if you actually are willing to loose power in favor of exhaust flames, then, you are ready for buying a riced out Honda. Or have an IQ test taken.

 

right click and save this movie of my car busting some phat flames. yo

 

i have both but.. i'm changing my dizzy this week and.. and once thats sorted out i will fix my air/fule..
so i guess i can say bye bye to flames..

 

So how come factory backed Mazda racecars pop flames?

 

Well Mr Smartass, because they are running OVERLY rich(at "low" rpm). (almost) All racecars pop flames, for the simple reason that overlap is huge. In a psiton engine this is caused by cam timing, in a rotary by port overlap. In race cars mostly by PP setup, which lets a lot of intake gasses go out through the exhaust (both are opened and closed by the apex seal, so plenty of overlap)
The new Renesis engine has all ports in the side housings just to reduce overlap to minimal. Results: MORE power, LESS fuel consumption.
Racing engine's must run at high RPM all the time, so a lot of overlap is built in. As a result, when deccelerating, they'll blow out unburned fuel.
But comparing a street engine with a race engine isn't really smart, unless you're planning weekly rebuilds...
And just for your information: race-cars do not need Mazda factory backing to pop flames, nor a rotary engine for that matter.

 

All of them with straight exhaust will do that. You should see mine on the track! 2-3 foot flames everytime I decelerate. A ferrari driver once commented to me that he kept his distance till the straight away to pass me because the flames were a bit large LOL.

 

I've seen Carl's flamethrower bananamobile firsthand. Tis truly a thing of beauty

 

When I was looking to buy my car, it had been parked beside a quonset for about a month. It was November and fairly cold out, but it started right up and ran fairly well. My dad was standing behind the car, about two feet away. When the car was warmed up, he told me to give it some revs.

I did.

He nearly caught fire. The car shot a three foot flame when I let off the gas, nearly igniting his pant leg. Needless to say, I bought the car. It doesn't do that anymore, but I have high hopes for it when I get my new Magaflow muffler.

I wonder if there's a penalty in AutoX for melting cones?

 

hahahaha melting cones

 

It's 2 seconds per cone.... don't ask me how I know.

 

I was under the impression that RB mufflers ARE straight through. Is there a different one for FB's? I know mine are.

 

 

well, don't worry. they do shoot pretty good. my daughter and i call it farting. cause it doesn't sound like a backfire, more like a deep hot fart.

 

quote:
--------------------------------------------------------------------------------
Originally posted by CrazyJoe12a
So how come factory backed Mazda racecars pop flames?

Actually, Mr. Smartass, the carbed race cars are blowing flames on decel because they have no decelleration dashpots, and the immediate closing of the throttle valves is causing a hurrendous amount of vacuum signal to act on the idle circuit, which sucks a ridiculously rich mixture into the engine.
There is no power to be harnessed from this fuel source.

 

However thay can be quite intimidating to cars following closely as I previously posted.