Search found 527 matches

by Vic Butler
Wed Sep 23, 2020 9:13 pm
Forum: MGB Technical
Topic: 123 ignition
Replies: 17
Views: 530

Re: 123 ignition

That's correct. It's switched by relays and the 12v comes from a separate contact on the starter motor. It's a complex set up which has been discussed in depth on the forum. The resistor on rubber bumper B's is a length of resistive wire in the loom.
by Vic Butler
Thu Sep 17, 2020 10:34 am
Forum: MGB Technical
Topic: 123 ignition
Replies: 17
Views: 530

Re: 123 ignition

It's only the coil that the ballast resistor circuit affects. Surely the distributor has its separate 12 volt supply. The Lumenition Optronic on my B takes its 12v supply from an ignition controlled source on the fuse box. The voltage to the coil doesn't, or shouldn't, affect the distributor. A conv...
by Vic Butler
Wed Sep 16, 2020 9:46 pm
Forum: MGB Technical
Topic: 123 ignition
Replies: 17
Views: 530

Re: 123 ignition

The lack of power after I fitted the 123 to the Land Rover was likely down to a lack of mechanical advance as the low compression engine (8:1) needs more advance than a higher compression engine.
A misfire developed though and I got my money back after I returned it to the supplier and they "lost it!"
by Vic Butler
Sat Sep 12, 2020 8:55 pm
Forum: MGB Technical
Topic: 123 ignition
Replies: 17
Views: 530

Re: 123 ignition

Presumably all was ok before the 123 was fitted.. I had one on my Land Rover a few years ago, worse than useless. The engine was down on power despite being set up exactly as in the instructions and then a regular misfire occurred. I returned it as requested by the supplier, they "lost" it and I got...
by Vic Butler
Wed Sep 09, 2020 7:34 pm
Forum: MGB Technical
Topic: Fuel tank change
Replies: 11
Views: 830

Re: Fuel tank change

Hi Vic, When you put back the tank in place, do you bolt it up, connect, fill with petrol and fire it up, or is there anything else or procedure you need to do? Thanks in advance Regards Mario Sorry for the delay in replying Mario. Fit the tank, connect everything up, double check and then put a co...
by Vic Butler
Mon Aug 31, 2020 4:43 pm
Forum: MGB Technical
Topic: Fuel tank change
Replies: 11
Views: 830

Re: Fuel tank change

The top is the vulnerable part because all the crud gets trapped. When I replaced the tank on my 77 BGT years ago I painted the complete tank with Hammerite black anti rust paint and then plastered the top with underseal. Of course that won't stop the inevitable corrosion from the inside. A galvaniz...
by Vic Butler
Mon Aug 31, 2020 4:38 pm
Forum: MGB Technical
Topic: trip counter
Replies: 12
Views: 2811

Re: trip counter

It appears there's a problem with the mechanism that operates the odometers in both cases.
Repair or replacement seems to be the remedy.
by Vic Butler
Tue Aug 11, 2020 8:13 pm
Forum: MGB Technical
Topic: Misfire on acceleration
Replies: 10
Views: 1387

Re: Misfire on acceleration

Going off topic Steven, I had a 123 that developed a fault on my Land Rover. The supplier asked me to return it, they lost it, I got a full refund and spent it on having a proper distributor rebuilt by the Distributor Doctor fitted with his Pertronix electronic ignition. That is still going strong a...
by Vic Butler
Mon Aug 10, 2020 1:39 pm
Forum: MGB Technical
Topic: Misfire on acceleration
Replies: 10
Views: 1387

Re: Misfire on acceleration

Sticking dashpot piston?.
by Vic Butler
Mon Jul 20, 2020 5:01 pm
Forum: MGB Technical
Topic: My 'New' engine.
Replies: 28
Views: 4589

Re: My 'New' engine.

I reckon the swarf wasn't thoroughly cleaned out after machining. As Ian said, a full strip down and a thorough clean is necessary. The crank, big ends, mains and small end bearings should be thoroughly inspected and dealt with as necessary.