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Triumph Torque    Cars    2000/2500/2.5PI  ›  Pinking
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Davemate
July 16, 2017, 6:49am Report to Moderator


Posts: 3,460
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2.5 engine

When engine cold nothing in any gear at any rev
When up to temp no pinking at low revs in any gear when throttle pressed however hard
If I'm doing 60 ish or a tad more and if I give it full throttle and hold it I appear to have pinking, back of the go pedal and the pinking stops
So high end/rev pinking :- what causes this and how do I sort it

I only use "super" petrol and normally BP


Herald 1500,rallyfied- overdrive,swing spring with 1500 spit diff,440lb front springs, adjustable height spax on front and back, trunionless conversion,thicker arb,rear roll cage,harnesses,bucket seats,extra gauges,Vitesse steering wheel,genuine 5.5j smoothies wheels,4 branch manifold
Still for sale

Mk1 2000 saloon,now a 2.5   

Timing marshal CT autosolo Bovington 2011,2012,half of 2013,2014 and 2016
Marshalled Essex winter rally 2013
RBRR 2012, co driver
24th Nachtrit 2012, navigator
Chinese rally 2013, navigator
Essex winter rally 2014, navigator
HCR 2014, co driver
RBRR 2014, co driver
Essex winter rally 2014,navigator
Warwickshire winter rally 2016,driver
HCR 2016 driver
Essex winter rally 2016 navigator
Mr Radders official calm down buddy
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iggy
July 16, 2017, 7:58am Report to Moderator
Club Member
Posts: 400
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Dave your ignition timing might be a bit to far advanced, or the fuel mixture could be a bit weak


1972 Mk2 2.5 PI on carbs
2005 Fiat Stilo jtd                                              
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JohnD
July 16, 2017, 8:24am Report to Moderator


Posts: 6,565
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Iggy beat me to it - weak mixture.    
Does your 2.5 run on carbs,  Lucas Pi or modern EFI witchcraft?

Pi tends to run lean at the top of rev range, so should be SRT a bit rich at idle etc.
The details are in the Lucas Pi manual, but you might do best to send the Metering Unit to one of the specialists to be recalibrated.
Prestige and the other one have calibration rigs,   just tell them about your engine and how you will use it and it'll come back perfect!    
If carbs, set them a bit richer, if EFI ditto, at the high revs where you're going weak.

John


Serial Vitesse racer.

Old Blue.  1995-2001
Silverback. 2001-2007
SofS. 2007 - to date.

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Davemate
July 16, 2017, 12:51pm Report to Moderator


Posts: 3,460
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Good ol carbs with a pi cam and pi dizzy, I'll go one flat richer and see how that goes
Cheers chaps


Herald 1500,rallyfied- overdrive,swing spring with 1500 spit diff,440lb front springs, adjustable height spax on front and back, trunionless conversion,thicker arb,rear roll cage,harnesses,bucket seats,extra gauges,Vitesse steering wheel,genuine 5.5j smoothies wheels,4 branch manifold
Still for sale

Mk1 2000 saloon,now a 2.5   

Timing marshal CT autosolo Bovington 2011,2012,half of 2013,2014 and 2016
Marshalled Essex winter rally 2013
RBRR 2012, co driver
24th Nachtrit 2012, navigator
Chinese rally 2013, navigator
Essex winter rally 2014, navigator
HCR 2014, co driver
RBRR 2014, co driver
Essex winter rally 2014,navigator
Warwickshire winter rally 2016,driver
HCR 2016 driver
Essex winter rally 2016 navigator
Mr Radders official calm down buddy
Logged
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Jonny-Jimbo
July 17, 2017, 8:11am Report to Moderator

Club Member
Posts: 4,838
Posts Per Day: 1.23
Sounds slightly similar to my pinking issue Dave - I solved mine by knocking the advance back a touch.


62 Vitesse 1600 - Slammed & modified
66 Herald 1200 - Donor
67 2000 - Fitted with 2.5 o/d - 2012 RBRR, 2015 Essex Rally, 2016 HCR, 2016 RBRR
67 2000 Estate - Awaiting rebuild & modification
70 Herald 13/60 - First car, many bits
77 CZ 125 Sport - 70 miles on the clock
77 Kawasaki KM90 - Shop hack
81 Yamaha DT125 - Running
88 Ginetta G4/4 - Dead
88 BMW E30 320i - For Sale
90 BMW E30 318iS - Building to FIA spec
90 Mazda Eunos 1.6 - 'Popeye'
93 BMW 530i - Donor
95 BMW E34 540i - 4L V8
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JohnD
July 17, 2017, 8:28am Report to Moderator


Posts: 6,565
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Dave,
One flat richer will make the mixture risher right across the range.
A better solution would be a needle thinner towards the tip, so richer whe it's wide open.
But I left carb needles behind years ago. someone else can advise you better on choice.

John


Serial Vitesse racer.

Old Blue.  1995-2001
Silverback. 2001-2007
SofS. 2007 - to date.

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Davemate
July 17, 2017, 3:36pm Report to Moderator


Posts: 3,460
Posts Per Day: 1.22
The needles that are fitted are the ones mr Witor recommend.
I'd imagine at best there only a basic setting, a rolling session is required I think to get them bang on.
I would like to fit a 123 dizzy before that happens and at the moment it's way way down on my
things to think about list


Herald 1500,rallyfied- overdrive,swing spring with 1500 spit diff,440lb front springs, adjustable height spax on front and back, trunionless conversion,thicker arb,rear roll cage,harnesses,bucket seats,extra gauges,Vitesse steering wheel,genuine 5.5j smoothies wheels,4 branch manifold
Still for sale

Mk1 2000 saloon,now a 2.5   

Timing marshal CT autosolo Bovington 2011,2012,half of 2013,2014 and 2016
Marshalled Essex winter rally 2013
RBRR 2012, co driver
24th Nachtrit 2012, navigator
Chinese rally 2013, navigator
Essex winter rally 2014, navigator
HCR 2014, co driver
RBRR 2014, co driver
Essex winter rally 2014,navigator
Warwickshire winter rally 2016,driver
HCR 2016 driver
Essex winter rally 2016 navigator
Mr Radders official calm down buddy
Logged
Private Message Reply: 6 - 7
glang
July 17, 2017, 4:37pm Report to Moderator

Posts: 538
Posts Per Day: 0.63
I get the same if the carb dashpots are low on oil so the pistons lift too quickly when accelerating so weakening the mixture
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