Search found 125 matches

by Paul Hollingworth
Fri Jul 16, 2021 2:44 pm
Forum: MGB Technical
Topic: Crankshaft pulley change
Replies: 3
Views: 219

Re: Crankshaft pulley change

We cant have Americanisms here. Harmonic balancer indeed. The correct name for that part is torsional vibration damper which perfectly describes what it does. Its an absorber tuned to the crankshafts torsional natural frequency. This frequency is excited by harmonics of the firing torques of the eng...
by Paul Hollingworth
Sat Jul 03, 2021 10:24 am
Forum: MGB Technical
Topic: Electronic Ignition, yes or no?
Replies: 12
Views: 762

Re: Electronic Ignition, yes or no?

I'm running with Luminition magnatronic at present. I cant say I've noticed any improvement over the points set up. With points you need to renew every 6000 miles or so, check your dwell is in tolerance and then set your timing (dynamic is best). You obviously don't have to do any of this with elect...
by Paul Hollingworth
Sat May 22, 2021 1:57 pm
Forum: MGB Technical
Topic: Light knocking noise in the engine.
Replies: 27
Views: 4034

Re: Light knocking noise in the engine.

When I got our B in 2000 it burned quite a bit of oil, about 500 miles to the pint although the compression wasn't that bad. People complained if they had to follow me. I decided to rebuild what I could with the engine in the car. I honed the bores and fitted new rings. Although the oil consumption ...
by Paul Hollingworth
Thu May 20, 2021 11:43 am
Forum: MGB Technical
Topic: Bench test
Replies: 4
Views: 745

Re: Bench test

My friend and I fitted a 123 distributor to his B and it has been excellent. We set it to curve 2 which is the original 25D curve 40897. He had HS4 (later HS6) carbs but originally had a 45D distributor which just don't go. I couldn't justify spending £270 on a 123 for my old girl so I fitted the Lu...
by Paul Hollingworth
Wed May 12, 2021 4:18 pm
Forum: MGB Technical
Topic: King Pin Top Bolt
Replies: 4
Views: 796

Re: King Pin Top Bolt

I had one side of mine that wouldn't shift. The problem is that its not firm enough for a strike from a lump hammer to shift it. No amount of soaking with penetrating oil helped. I ended up taking one of the arms off the damper and with the four retaining screws out I could push the rubber bushes th...
by Paul Hollingworth
Sun May 09, 2021 11:31 am
Forum: MGB Technical
Topic: Running on suddenly.
Replies: 19
Views: 2712

Re: Running on suddenly.

I would have thought a standard B series with a compression ratio of 8.8:1 would be happy on regular unleaded (95 RON) without retarding from factory settings. A lot of engines have been re- bored and had their heads and blocks skimmed so may be over 9:1 now. Certainly mine has, however I still use ...
by Paul Hollingworth
Sat May 08, 2021 12:33 pm
Forum: MGB Technical
Topic: Running on suddenly.
Replies: 19
Views: 2712

Re: Running on suddenly.

I managed to get the graph to post this morning
by Paul Hollingworth
Thu May 06, 2021 12:03 pm
Forum: MGB Technical
Topic: Running on suddenly.
Replies: 19
Views: 2712

Re: Running on suddenly.

Well done Mike. My Factory workshop manual only goes up to 1972 which is fine for my car but it means that I have to rely on Paul Hunts Bee & Vee site for data. I found the data in the Haynes manual confusing and I don't have Not_Anumbers engine number. Vic is right in that the 45D distributer c...
by Paul Hollingworth
Wed May 05, 2021 11:00 am
Forum: MGB Technical
Topic: Running on suddenly.
Replies: 19
Views: 2712

Re: Running on suddenly.

The 45D distributor has a radically different advance curve to the 25D and is not recommended by Peter Burgess. The early 18V engines (72-74) had the 25D. One can only presume that the 45D curves are an attempt to reduce emissions and improve economy. The other advantage of the 25D is that it has a ...
by Paul Hollingworth
Sun May 02, 2021 11:28 am
Forum: MGB Technical
Topic: Running on suddenly.
Replies: 19
Views: 2712

Re: Running on suddenly.

Given that your running on problem started when you changed distributors it seem likely that it is timing related. Is your vacuum advance working ? this should help stop running on. From what you say your engine runs on for a long time with the ignition off suggesting you may have a problem with cok...