Joined: Apr 2018 Posts: 70 Threads: 20
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Having only recently starting using my mk2 Ruby on longer runs after a long restoration, I have noticed that it sometimes pops from the exhaust on overrun.
The car runs very well, the timing appears to be about right ( electronic ignition so difficult to set bang on ? ) and the mixture may be a little rich.
Is this normal and, if not what action is recommended ?
Thanks
Joe.
Joined: Mar 2015 Posts: 5,204 Threads: 223
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Location: Scotchland
You may have a slight induction leak, possibly on the carb or inlet flange.
Joined: Apr 2018 Posts: 70 Threads: 20
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Thanks Ruairidh.
I did check the carb flange for flatness and the carb spindle is as new but I will double check to see if I have missed anything.
The popping is only slight and is probably at its worse when the engine is not fully warmed through.
I have spent many hours tracing and rectifying the sources of rattles and bangs on my car and it is now "almost" on the verge of sophistication !!!
Thanks again
Joe.
Joined: Aug 2017 Posts: 1,230 Threads: 33
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Location: Salop
Car type: '28 GE Cup. '28 AD Chummy '30 RL Saloon. '34 RP Saloon. Too Many toys!
my daughters RP does it if you lift off instantly while pulling hard. Its excellent for putting the wind up cyclists riding 2 abreast when you overtake. Just lift off the throttle and it. Goes 'pop. pop' with the occasional muffled 'bang'.
Joined: Aug 2017 Posts: 1,668 Threads: 46
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Location: Auckland NZ
Car type: 36 Nippy, 31 RM, 38 Special, 24 Works Rep
If you do not find an air leak I would suggest you look at the timing and the advance curve of your distributor.
Black Art Enthusiast
Joined: Aug 2017 Posts: 90 Threads: 2
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Joe check that you don’t have an exhaust leak between manifold and silencer. It can have the same effect
Joined: Jan 2019 Posts: 1,482 Threads: 17
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Location: Bala North Wales
Car type: 1933 RP Standard Saloon
I recently had the same sort of problem with my RP. Tightening the manifold to downpipe flange cured it.
Joined: Aug 2017 Posts: 1,230 Threads: 33
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Location: Salop
Car type: '28 GE Cup. '28 AD Chummy '30 RL Saloon. '34 RP Saloon. Too Many toys!
my issue is the throttle spindle
Joined: Aug 2017 Posts: 772 Threads: 26
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Location: On a hill in Wiltshire
On mine, if I rev it and then go to maximum retard as I lift off I can get a lovely loud BANG! from the exhaust.
Naughty, but a real head turner, used in the right place.
Joined: Aug 2017 Posts: 1,230 Threads: 33
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Location: Salop
Car type: '28 GE Cup. '28 AD Chummy '30 RL Saloon. '34 RP Saloon. Too Many toys!
Ken Fox does that with his Indians on the wall of death
