Engine Flood prevention

[leeroy_25]

I thought I would post this as I don\'t know if it is a recommended standard practice with the RX7 that I had not been told about or whether it would spread some possibly helpful information to the rest of you. I heard along a grape vine from a friend who works at Fords that the recommended shut down procedure on the RX8 is to turn the engine off while at 300rpm. This is to help rid the chambers of fuel which could cause flooding upon restart. As I am sure you are all to aware the rotary is prone to flooding!

Let me know if you all new about this or if it is helpful. Or maybe you disagree hugely!?

Lee

[ro284]

Mines never flooded in 4 years, i think i read a post from Carl some time ago, that you would only need to do this if you were starting from cold, and only needed to move the car a few feet, and the engine has not had time to warm up, before you need to restart the engine,

[leeroy_25]

That\'s what I have heard from another source which makes a lot more sense as I would expect it to be more likely to flood on cold start.. maybe the grape vine was a little confused!

[Martiny]

I think you mean "from 3000 rpm" ?

[TonyC]

I think he does, and it\'s what I do when I run the car for brief periods.

[logicalChimp]

Hmmm

fwiw, I asked about this at Rotechniks, back when I was having probs with my engine.  They said that whilst it works on the RX7, it *doesn\'t* work on the \'8 - because as soon as you turn the key off, the throttle body slams shut (or something like that) meaning you don\'t get any air flowing through...  apparently the TB closes slightly slower on the \'7, meaning enough plain air is allowed in to help pump the \'cylinders\' dry.

don\'t know if that makes sense? I can sorta see how it works, but my understanding of engines kinda stalled about 15 years ago, when i looked at my mums 0.9 fiesta (which was so basic, you could run it without a battery once it had been jump-started!)

[JohnP]

solution: leave the car running for 5 mins before u turn it off. i do. never had a prob..., and whats 5 mins to prevent hours of deflooding!

[RemarkLima]

logicalChimp, that would make sense on the RX8 as it\'s "throttle by wire", so once the ignition is off, the throttle (controlled by the computer, not by the foot, connected to a cable) closes.

On "traditional" cars, the throttle is controlled by a cable attached to a pedal which your foot does it all

Now, it\'s just another sensor and the computer say "Hmmm, did he REALLY want full throttle there? I\'ll just give him 75% and ease it up to 100% for him when we have the grip available"

Hope that makes sense!

[craigr]

Hmm, interesting as I was advised by an AA mechanic to do the 3000rpm trick when he deflooded my RX8 roadside. It\'s apparently in their database along with the deflood procedure.

[RemarkLima]

I know the High Power RX8 has throttle by wire, but dunno about the lower powered one so could be for that?

[Martiny]

Well, perhaps on the RX8 it still helps a little - even though the Throttle closes - it could still push a lot of unburnt fuel out of the exhaust ports, and it could still help swish some air over those plugs to dry them.