About this flooding business
 

I sell Mazda's and we often move cars around on the lot, including the 8's. They rarely even get warm, let alone run for 5 minutes or more.

If you gently rev up to 4000+/- rpm then turn off the key while its reved you should not have any problems with flooding. By having it reved and turning off the key, the rotors spin down while the fuel pump and injectors are shut off... This blows out most of the un-needed fuel.

Your results may vary... but all of ours start smoothly every time now.


BTW... I've got a red GT 8 out in the garage that I "borrowed" for a day or three to see if I really want to buy one.... it's hard to give up my supercharged Tacoma.

is that the reason why everyone revs up a little bit b4 shutting down the engine? i see(hear) everyone does it, (even with other cars) and i do it too but i never knew what the reason was

I do the same thing and never have the flooding. I run it about a minute. Then rev it up a few times and shut it off. My Honda Accord would flood every time if you just started it backed it out of the garage or in and then shut it off. It just would fill with fuel due to the cold start injector. I would have to floor it and hold it down until it finally started. You just have to let it run a bit. Good for any car keeps the gas from deluteing the oil.

Thanks for the good suggestion...I used to just let it sit for a few minutes...will start reving it....never had a problem flooding...just hesitation if not fully warmed up!

Thanks for the tip, I'll keep that in mind.

Re: About this flooding business
 

Good tip - and it's part of the official Mazda procedure to follow if you only run the car for a few minutes!

Regards,
Gordon

Nope - in piston engines, it's pretty useless to do that. Probably more harmful than anything, and there's no benefit. Way back in the days of carburetors, it was relatively common practice, but even then it probably resulted more in fouled spark plugs than anything else.

Regards,
Gordon

It's a good tip/reminder

I think unless I worked for a dealership and had to move cars short distances all day long, that I'd still be tempted to use the excuse to drive it around the block once or twice to warm it up instead though. :)

This is funny. For years we RX-7 owners never figured out this would work. I just read a few days ago someone dissing this technique, and even I didn't figure out why it would work. It makes perfect sense. Kudos to Mazda for coming up with that! See, even us old farts are benefiting from the RX-8 ;-).

I used this trick in my FC back about 10 years ago. I havent bothered in my 8 though. I have no issues with it (i usually drive to and from work which is 20 miles each way, and it warms up a bit before i even start driving it).

nice bumping up a 7 year old thread.

I bought a 73 RX3 new in Austin tx, and learned the first summer that you don't shut off car and try to start 10 minutes later on a hot day. I never had any cold starting trouble.

I'd have to do the hot flooded start, by holding throttle to the floor and cranking for 15 or 20 seconds.

Since it had a carb, I'm pretty sure the gas just evaporated out into the manifold flooding it when it was real hot.

I wish I'd thought about premixing, also. Might have had better hot starting compression.

Back in the day, the exhaust port was Peripheral. The excess gas would just get thrown out of the rotor housing automatically. So, it was a bit harder to flood those on a cold start then it would be on ours *Side Exhaust Port".

Either way, flooding is a big issue with Rotary Engines of all generations.

holy....how did i even come across this thread? Sorry about that. (though apparently it has new life! iiiit's ALIIIIIIVE!)...anyway, sorry.

I got 75k miles out of the 73 rotary until the water seals let go. I could keep driving it, and as long as I kept it hot it would hold water to not over heat, but when it cooled down over night, water would seep into the chamber and wet the plugs.

So I had flooding by water, but I could drive across Texas to see a friend, take out the 4 plugs (very easy then) in the morning, then heat in their oven to dry. Would start right up!

The next engine blew the apex compression seal while I was holding 7krpm on a high speed top out, but I loped it home and 40 miles over to a mechanic to do a transplant with RX4 rotary.

This is the beauty of the rotary; most of the time you can limp home when you've blown the engine, but never on a piston.;)

LOL. :yelrotflm

It's all good, this thread's teachings actually came up useful to me.