rear 3 cylinders running rich

Engine Oily Bits, Ignition, Fuelling, Cooling, Exhaust, etc.
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GSouthee
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Location: Hawkhurst Kent

rear 3 cylinders running rich

#1 Post by GSouthee » Thu Jul 12, 2018 5:11 pm

Hi just back from Le Mans classic and found the engine when very hot ran on a bit after switch off. I have now checked the timing, and it was a bit advanced so adjusted it, checked the plugs and these were at 27 thou so reset to 25 thou, however I noticed that the rear 3 plugs were black and smelt a bit of fuel. I did tune the carbs when engine rebuilt 1200 miles ago. Could I have that wrong or is there a simple check on the carbs mainly the rear carb ( I guess) I can do.

Cheers for any assistance.

Gary
1949 Ac saloon with 2.6 Triumph engine/gearbox.
Land rover SII with V8 power.
1955 AC saloon pickup project also to be Triumph powered.

A car is not an investment it is for driving.

Clifford Pope
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Re: rear 3 cylinders running rich

#2 Post by Clifford Pope » Thu Jul 12, 2018 5:23 pm

Float needle valve sticking open?
Choke sticking on?
Dashpot diaphram perished? (Not sure which carb)

It can't have spontaneously gone out of adjustment - must be something sticking or not working properly?

GSouthee
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Joined: Wed Nov 08, 2017 9:20 am
Location: Hawkhurst Kent

Re: rear 3 cylinders running rich

#3 Post by GSouthee » Thu Jul 12, 2018 7:19 pm

Cheers Clifford,

They are SU hs6's, they were rebuilt by a specialist at time of engine rebuild. Guess could be sticking float or needle will check them. I have checked the air flow with a hose and the ear both seem to sound the same. Choke looks ok but will check again.

Cheers G
1949 Ac saloon with 2.6 Triumph engine/gearbox.
Land rover SII with V8 power.
1955 AC saloon pickup project also to be Triumph powered.

A car is not an investment it is for driving.

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