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Highest Col a PI can take


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#1 John L

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Posted 04 July 2018 - 08:26 PM

Whats the highest Alps Col can a well setup PI at sea level manage without being overly rich and causing problems?

I managed 2326 meters  Col de la Cayolle today, but didn't think I would try the next 2750 meters.

John


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#2 nowtelse2do

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Posted 04 July 2018 - 08:49 PM

I've done the Stelvio twice, fully loaded and with a passenger, we just made it both times.
Grossglockner twice, same again, fully loaded and passenger, see avatar.

Dave
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David


#3 john.r.davies

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Posted 05 July 2018 - 02:26 PM

In a 2.5L, Lucas Pi powered Spitfire, Jonathan Binnington and I got up the Col d'Iseran, the highest through pass in Europe at 2770m, but only just. This was on a Club Triumph '10 CR" in ?2006?
John

Edited by john.r.davies, 05 July 2018 - 02:29 PM.

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#4 roy53

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Posted 06 July 2018 - 01:04 PM

I've done the Stelvio twice, fully loaded and with a passenger, we just made it both times.
Grossglockner twice, same again, fully loaded and passenger, see avatar.

Dave

Did exactly the same as you Dave with no problems.What was alarming was when we entered the tunnel at the top of the Grossglockner [  cool air  ] was how the car accelerated, like a turbo kicking in.

 

Roy


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#5 Andy Moltu

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Posted 09 July 2018 - 07:33 AM

If properly set up they should do the mountain passes, however they will run very rich. You will need to keep the revs up and expect to guzzle petrol.

 

The standard Lucas PI system as fitted to the TRs had no compensator for atmospheric pressure (apparently one or 2 units with a compensator do exist) so the metering unit is "tricked" buy low atmospheric pressure into fuelling as if the throttle was open further than it was. So at altitude they run very rich almost as if the choke was out.

 

For high altitude markets like Switzerland Triumph simply set the metering unit to run relatively leaner, which was fine until the car was dropped to lower altitude so the car then runs very lean.

 

Leicester Group parked at the top of Stelvio image004.jpg


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Andy M
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#6 nowtelse2do

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Posted 10 July 2018 - 05:44 PM

Did exactly the same as you Dave with no problems.What was alarming was when we entered the tunnel at the top of the Grossglockner [  cool air  ] was how the car accelerated, like a turbo kicking in.

 

Roy

 

Roy, this was 1st week in June 2013, 5 minutes later it was a blizzard and the car (Jag) was on summer tyres. To say the least....it was interesting and the temp was dropping ;)

 

Dave

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Edited by nowtelse2do, 10 July 2018 - 05:45 PM.

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David


#7 ianc

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Posted 13 July 2018 - 08:27 PM

The 2.5PIs on the World Cup Rally had a cable-operated control to the metering unit to help compensate for high altitude in the Andes.  See Graham Robson's excellent book on the Rally.

Ian Cornish


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