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Home > General Chat > Hot start issues - has this been done / will this work?

MarkGTT

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Hi, after some more messing with the fuelling i took the car out for a blast last night, stopped for a few minutes but it wouldn’t start back up.. im sure i could hear the fuel boiling in the carb.

Thinking of adding a few pc case fans and some ducting in the engine bay that i can keep on after a run to keep the carb cool.. has this been done before if so will it shift enough air to make a difference.

cheers.


Prawn

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I always thought hot start issues were due to a reluctance to actually turn over? I know mine turns over MUCH faster when it's hot.

Also, surely the carb doesn't get hot enough to boil the fuel in the float? I know it's n/a, but my weber is STONE cold after an enthusiastic drive....

surely the carb won't be reaching temps much above the average charge temp?

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turbodave16v
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It has been done many times.

A fan of some kind works - and was even standard fit on vehicles like the R5GT and montego turbo.

Personally - 30/60 seconds before I shut down, I knock off the fuel pump. If i need to re-start, I turn on the pump, and fresh (cold) fuel flows into the carb and makes starting a doddle.

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theoneeyedlizard

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Having a turbo directly beneath the carb at a few hundred degrees helps to increase the temp somewhat.

Have you got a heatshield on the carb Mark?

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apbellamy

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I've seen pic of one on a nice green mini van. Have a search...

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MarkGTT

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On 28th Jul, 2009 theoneeyedlizard said:


Have you got a heatshield on the carb Mark?


yeah.. but its not the best.

might try the fans then, already have the pump wired to the fuel pressure switch so not sure if i want to stick an inline switch in as well.

did have a search but couldn’t find the pic of the mini van..


MarkGTT

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On 28th Jul, 2009 Prawn said:


Also, surely the carb doesn't get hot enough to boil the fuel in the float? I know it's n/a, but my weber is STONE cold after an enthusiastic drive....

surely the carb won't be reaching temps much above the average charge temp?


welcome to the world of turbo's :)


Turbo Phil

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Press the throttle wide open when cranking the engine for a hot start. Obviously quickly let the throttle off once it fires.
Never have any trouble when I do this, infact it's the recommended procedure in the Metro Turbo handbook.

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MarkGTT

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On 28th Jul, 2009 Turbo Phil said:
Press the throttle wide open when cranking the engine for a hot start. Obviously quickly let the throttle off once it fires.
Never have any trouble when I do this, infact it's the recommended procedure in the Metro Turbo handbook.


Cheers Phil, probably down to my inexperience of using the car then..


Mr Joshua

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Rover did this to the Maestro Turbo. I have the complete set up in a box somewhere.

Edited by Mr Joshua on 29th Jul, 2009.

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Miniwilliams

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yes a fan will be good, some turbo cars have then. Have you done the old carb trick of getting rid of the bio metallic strip on the jet? this isn't ideal for hot starts.

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stevieturbo

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Ideally, drive about for a bit to let things cool down before shutting off.

Although Daves idea of shutting fuel pump off, to allow carb to run dry is a good one.

I doubt a PC fan would shift enough air to be very viable, unless it was properly ducted with cool air.

A heat shield under the carb will make a huge difference though., or possibly an escape path for the heat through a vented bonnet

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1972-ANGUS

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or possibly an escape path for the heat through a vented bonnet

interesting, does anyone have a good pic of this done on a standard T3 setup????

Ive never seen a heat shield on the plenum either if anyone has a pic handy?? please please!!! *Yes*


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Loads good comments in here:

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=3279

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Ben H

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We had this exact problem on the TT years back. It is not a matter of cooling the car down before shutting off as it is the heat soak that causes the problem. We sometimes had to pour water over the carb to get it started.

Two hole directly above the carb in the bonnet solved the problem. I think that a small fan probably would help, so long as you have a heat shield too.

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MarkGTT

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cheers chaps, plenty i can do to help this then.


stevieturbo

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On 30th Jul, 2009 1972-ANGUS said:
or possibly an escape path for the heat through a vented bonnet

interesting, does anyone have a good pic of this done on a standard T3 setup????

Ive never seen a heat shield on the plenum either if anyone has a pic handy?? please please!!! *Yes*


Regards
Colin


I drilled a series of holes above my car in the bonnet.....which at the time seemed like an ok idea.


With hindhsight it looked totally shite. A proper grill or louvre of some sort would be more appropriate.

Although contradictory to above, I found that driving normally for a couple of minutes before shutdown, meant that it always re-started upon request.

If you shutdown with the turbo glowing....there were times I had to wait some 20-30mins before it would re-start. Although I did keep a bottle of water in the car as well....

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James_H

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Could this be the main reason for the ERA bonnet vent...


Ben H

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On 31st Jul, 2009 stevieturbo said:


Although contradictory to above, I found that driving normally for a couple of minutes before shutdown, meant that it always re-started upon request.


I think the problem with ours was that between runs was maybe an hours tops two hours so it never really cooled hence the starting problems, also I think that the GRP bonnet insulates much better than metal one, although that is just a guess.

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1972-ANGUS

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On 31st Jul, 2009 stevieturbo said:



though contradictory to above, I found that driving normally for a couple of minutes before shutdown, meant that it always re-started upon request.




lol what are we like? "driving normally" lol

i know what you mean.

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