Overrunning
Turbo Mini Forums

I can't stop my car overunning after turnoff; a common problem I know. (non turbo 998 with 10.5:1CR)

Not entirely sure what's causing it, changing the plugs seems to help for a bit.

I thought I'd try using a solenoid valve on the carb breather to see if this helps. Anyone any thoughts on the subject?

Also, anyone got one knocking around they'd like to sell me?

Cheers
Wil

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

metro and a scrappy is what you need

Works a treat!

Alex

AlexF

PM me your adress wil, 90% sure i got at least one at home.

I used to get this on a 10.8:1 1100cc engine I built a while back, nothing I seemed to do to the ignition timing etc would seem to cure it.
The MG metro anti-run on valve cured it once and for all though, I plumbed it into the servo take off on the inlet manifold, you may find that the carb breather isn't large enough diameter to flow enough air to make any difference.

just use secong gear like i used to and turn engine off then lift up clutch at the same time it works a treat once you get the hang of it.

always looking for them bigger bunches of bannanas

HA ha ha ha at hoggy, I used to do the same thing, turn it off and then stall it against the handbrake at the same time!

been there too lol a good handbrake and select 2nd lol.... I found it occurs when mini gets hot, and the timing is slightly off. could a collapsed or failing lead be the culprit ? or perhaps a coil on its way out just some thoughts. if it is a
+ would the vacume pipe affect this ? (on the dizzy)

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MikeRace, Mini13

its to do with setup in the ignition/idlespeed/mixture department. Can be exaggerated by excessive combustion chamber build up, but in my experiance is a right pita to sort properly. Try dropping the idle speed if you can, obviously to an extent which doesnt start damaging the engine or stalling. This is the bigest contributor as far as i can tell from my own efforts.

I've seen the future and tbh its Pie

i had a 12G940 headed 998 a while back (ran around high 11's CR) it over ran on every shut off too. i jsut got used to stopping the car with it in gear and one foot on the brake and one on the clutch "stalling" the run-on. :S

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

check your points for the right gap that can nock timing out you can run a run on valve from metro or fiesta the ones with x/flow engines when you fit it check for air leak at the flap end of the valve when engine is running because old valve can leak

1293 Turbo mini

Got no points, I run a megasquirt. So it's nowt to do with ignition.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

Hi,
Wrong heat range plugs? Mines caused by low octane fuel!!!!
Cheers,
Gavin. :)

Edited by Bat on 4th Jan, 2006.

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The metro anti-run on valve will cure it once and for all...........

the valve wil...

go looking buddy

the plug ranges help but......... use OCTANE !!!

but the cheap option is the scrappys ...if you can sneak by the gaurd dog...lol

Well I run NGK BPR6ES plugs and always add VSP (measured out) to 95RON fuel to give 97RON.

Hummm...

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

the only trouble with the anti run on valves is they have a tendancy to get leak pass, so misture will lean out whilst running, but a good cure as long as you get a good one.

always looking for them bigger bunches of bannanas

wow, my car did this ages ago, people used to look at me when i stalled in car parks lol.

mine was cased by one of the following (cant specify as they were all fixed on the same day so the prob stoped)

*points gap incorrect
*timing advanced
*mixture too rich
*exhast blowing at manifold

very much doubt it will be any of these on your car though

WIL,..... 95 ron as a base line fuel....

i thought you would be a optimax man 99 ron

i use champion N9Y CC

with tetra boost measured out to 105+ ron with optimax as my base fuel.
http://tetraboost.com/

Edited by BENROSS on 5th Jan, 2006.

Well on the TT we use nothing but optimax and CVL which gives us about 102ron. But for a NA 998 and the daily drive optimax is not worth it.

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http://www.hillclimbandsprint.co.uk/default.asp

A man without a project is like a like a woman without a shopping list.

As Ben says, It's the daily hack I can't stop overunning, and that dosen't get posh fuel.

Bud has sent me a valve though (nice fella) so I'll give that a go.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

top guy

I had probs with over run last year the valve didnt help, the next time I had the head of I removed all the sharp edges on the head that were caused by refacing the problem went away.

http://www.rabdunn.co.uk/

Im lucky if mie runs let alone overruns!

Whats going to break next!?

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mine used too do it cuz it was ticking over a little too high.
i think weve all done the stalling trick

Edited by ben doodar on 12th Jan, 2006.