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Triumph Torque    Cars    Stag  ›  Idle issues
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Mr Happy
August 6, 2017, 3:02pm Report to Moderator

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Hi all

My RV8 powered Stag is almost ready for its MOT.

However the idle becomes rough and the engine stalls when the electric fan comes on.  Any suggestions on how to resolve this would be appreciated.

(Range Rover Classic 3.5 pulsar - 390 Holley)

Thanks

LB


MKII Manual - Rover V8 conversion
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shenderson
August 7, 2017, 11:38am Report to Moderator

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Hi

The extra load on the alternator when the fan cuts in is probably causing the idle speed to drop too low.  A work-around might be to increase the idle speed, but that will increase overall fuel consumption and, if it's an auto, increase the jolt when engaging gear.
EFI models use a solenoid to increase the idle speed when ancilliaries such as fan, aircon etc cut in.  I've no experience with Holleys; maybe something similar already exists.  Devising one from scratch could take quite a bit of work.

Try asking one of the RV8 specialists for advice, e.g. RPI Engineering.

Steve H
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Mr Happy
August 7, 2017, 7:15pm Report to Moderator

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Hi Steve

Thank you for the response...it's a manual so should be ok with a higher rpm as Its sitting at approx 800.

Thanks

LB


MKII Manual - Rover V8 conversion
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roger keys
August 7, 2017, 7:15pm Report to Moderator

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Quoted from Mr Happy
Hi all

My RV8 powered Stag is almost ready for its MOT.

However the idle becomes rough and the engine stalls when the electric fan comes on.  Any suggestions on how to resolve this would be appreciated.

(Range Rover Classic 3.5 pulsar - 390 Holley)

Thanks

LB


Id suggest its overly lean, or possibly overly rich. Once the addtional load is added, it then struggles. Or its not idling on the idle jet, until the fan cuts in. Either way, id suggest a carb issue.

Ive got a holley on my stag V8 and its rock solid under all conditions. And ive got a kenlowe.



1980 Triumph Dolomite Sprint - broken
1974 Triumph Stag - 4 speed auto - sort of working
1970 Triumph 2000 - 3.5 V8 - in bits
1973 Triumph Stag - 4 speed auto.
1969 Dodge Charger RT/SE, complete.
2017 HSV Maloo
2016 Ford Mustang

RBRR 1990, 1992, 1994, 1996, 1998, 2000, 2002, 2004, 2006, 2008, 2010, 2014, 2016
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Mr Happy
August 10, 2017, 9:19pm Report to Moderator

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Thanks Roger.

BTW where did your engine originate from, and do you have PAS?


MKII Manual - Rover V8 conversion
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roger keys
August 17, 2017, 8:05pm Report to Moderator

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Quoted from Mr Happy
Thanks Roger.

BTW where did your engine originate from, and do you have PAS?


Its a stag engine, far as i know original. PAS as standard.

Put a rover V8 in my 2000. That has PAS too. Just used the original triumph system including the pump.



1980 Triumph Dolomite Sprint - broken
1974 Triumph Stag - 4 speed auto - sort of working
1970 Triumph 2000 - 3.5 V8 - in bits
1973 Triumph Stag - 4 speed auto.
1969 Dodge Charger RT/SE, complete.
2017 HSV Maloo
2016 Ford Mustang

RBRR 1990, 1992, 1994, 1996, 1998, 2000, 2002, 2004, 2006, 2008, 2010, 2014, 2016
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