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leyland brother
 Post subject: Hot Engine
PostPosted: Thu Aug 31, 2006 12:12 pm 
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Location: Melbourne, Craigieburn
When the engine is running a little hotter than normal (ie: in heavy traffic) when i go to take off from stand still it seems as the fuel is vaporising before it actually gets to the cylinders.

I say this because when i attempt to move off, the car almost wants to stall, but if i rev it higher and ride it out no probs... The car is fine when cold or normal operating temp.

Can fuel evaporate from heat in the manifold???

Thanks people.

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Stuwey
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PostPosted: Thu Aug 31, 2006 12:15 pm 
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Always did that when i had it, too...

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cush
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PostPosted: Thu Aug 31, 2006 12:38 pm 
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running lean makes the car run hot... check the mixture...

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kazjim
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PostPosted: Thu Aug 31, 2006 1:10 pm 
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Vapour lock

Electric Fuel pump

No More Vapour Lock.

J

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Stuwey
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PostPosted: Thu Aug 31, 2006 1:18 pm 
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Its already got a 'leccy SU-type pump off an MGB. Seemed to feed the weber/1293 fine :?

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leyland brother
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PostPosted: Thu Aug 31, 2006 1:23 pm 
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I replaced the spark plugs on the weekend, haven't driven it in traffic yet, but the old N9YX's were black on the tips and threads... I thought that indicated rich mixtures :?

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Stuwey
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PostPosted: Thu Aug 31, 2006 1:45 pm 
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Its was dyno'd about a month before you got it. I tried NGK plugs, but they fouled up pretty quick. Useless for stop/start driving.

The ol' Champion N9Y's worked much better. Never had a problem with them.

What plugs are you running now?

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czerial
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PostPosted: Thu Aug 31, 2006 1:47 pm 
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i think its the NGK 6BPES that is the best for a mini they dont foul up like the cooler plug does
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leyland brother
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PostPosted: Thu Aug 31, 2006 2:06 pm 
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BP7ES from memory... I asked for a colder plug than the equivalent of the N9Y's which is the the 6ES like Chris said.

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Stuwey
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PostPosted: Thu Aug 31, 2006 2:07 pm 
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Could be the problem. Cooler plugs will foul easier...

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leyland brother
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PostPosted: Thu Aug 31, 2006 2:09 pm 
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I've only just put these plugs in... I haven't driven the Mini since Saturday night when i had the problem. Plugs went in Sunday.

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czerial
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PostPosted: Thu Aug 31, 2006 4:41 pm 
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the 6ers are a hotter plug i beleive
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leyland brother
 Post subject:
PostPosted: Thu Aug 31, 2006 6:00 pm 
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czerial wrote:
the 6ers are a hotter plug i beleive


Yes, thats why i bought the 7ES's, i was told they were one colder than the 6's...

Still... The above mentioned problem happend before i changed the plugs, basically, the same components that were in the car when i bought it.

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drmini in aust
 Post subject:
PostPosted: Thu Aug 31, 2006 7:48 pm 
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leyland brother wrote:
czerial wrote:
the 6ers are a hotter plug i beleive


Yes, thats why i bought the 7ES's, i was told they were one colder than the 6's...

Still... The above mentioned problem happend before i changed the plugs, basically, the same components that were in the car when i bought it.

If it was fouling with 6ES you need a hotter plug, not colder. Try BP5ES. :wink:

Note NGK's plug numbers are arse-about compared to Champion (or Bosch).

Hotter
Champion N11YC = NGK BP5ES = Bosch W8DC
N9YC = BP6ES = W7DC
N6YC = BP7ES = W6DC
Colder

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aaron
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PostPosted: Thu Aug 31, 2006 7:56 pm 
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if your running unleaded and even more so premium unleaded you will need to run a hotter plug, BP5ES, for the simple fact that unleaded petrols have a high combustion point to the old stuff. The higher the Ron the higher the flash point. Hotter plug is needed to get a hot enough spark to ignite all the fuel in the cylinder, otherwise you get black sooty plugs.

Cheers
Aaron

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