Search found 98 matches

by Paul Hollingworth
Wed Sep 23, 2020 4:20 pm
Forum: MGB Technical
Topic: 123 ignition
Replies: 17
Views: 565

Re: 123 ignition

The resistor is in series with the coil so drops the voltage the coil sees to a nominal 6V. When cranking 12V is fed from the starter motor so in effect you are running a 6V coil at 12 V which is supposed to give a better spark. I think it just ensures a good spark if your battery is on the flat side.
by Paul Hollingworth
Mon Sep 21, 2020 2:49 pm
Forum: MGB Technical
Topic: 123 ignition
Replies: 17
Views: 565

Re: 123 ignition

My friends 68 B had had a ballasted ignition system fitted to it. I removed the resistor, wire down to the starter motor and fitted a new Bosch blue coil (as recommended by 123)
by Paul Hollingworth
Thu Sep 17, 2020 2:35 pm
Forum: MGB Technical
Topic: 123 ignition
Replies: 17
Views: 565

Re: 123 ignition

I helped my friend fit a 123 distributor to his mildly tuned MGB.(his engine is closest to a 1972 18V engine and has the larger inlet valves) He's tickled pink with it. We set it to curve 2 which is the 40897 advance curve standard for pre 1973 cars. Peter Burgess says in his book that this curve is...
by Paul Hollingworth
Wed May 27, 2020 11:19 am
Forum: MGB Technical
Topic: Spitting through HS4 carb
Replies: 29
Views: 5204

Re: Spitting through HS4 carb

I believe the default setting for the position of the jet is 0.060" or 1.6 mm down from the bridge. I find that although this might not be the optimum setting for every engine they normally run OK at this. Getting the mixture right on both carbs is the trickiest adjustment, each carb should be simil...
by Paul Hollingworth
Wed May 20, 2020 11:57 am
Forum: MGB Technical
Topic: oil draining back if left for a few days
Replies: 6
Views: 1468

Re: oil draining back if left for a few days

I had an issue with oil pressure when my engine had been rebuilt. I had been using Mann filters with no problem but it was rebuilt with a Unipart. I switched back again and the problem went away. It turned out that the steel tube in side the filter was sticking up too much and fouling the relief val...
by Paul Hollingworth
Tue Apr 28, 2020 11:18 am
Forum: MGB General
Topic: Drive it day
Replies: 10
Views: 3459

Re: Drive it day

The Midland Centre has a theme running on its Facebook group called 'On the drive it day'. Please feel free to add piccies of your car if you are in our region. Search for MG Car Club Midland Centre group and you should find it. May be of interest to all MG enthusiasts. Here's my photo On the drive ...
by Paul Hollingworth
Mon Mar 30, 2020 11:41 am
Forum: MGB Technical
Topic: An electrical puzzle?
Replies: 12
Views: 3617

Re: An electrical puzzle?

Ian- does your timing light have a connection to the low tension side and if so have you got it on the right side of the coil ?
by Paul Hollingworth
Sun Mar 29, 2020 3:10 pm
Forum: MGB Technical
Topic: An electrical puzzle?
Replies: 12
Views: 3617

Re: An electrical puzzle?

I've always connected my Gunson's autoranger meter positive to the bottom fuse, negative to a headstud on the engine. There's a third wire which goes to the coil on the side that leads to the distributor. Its always worked fine on my 71 MGB. In fact on many cars in the last 25 years. I've just conve...
by Paul Hollingworth
Thu Mar 12, 2020 4:14 pm
Forum: MGB General
Topic: Not MGB related but just a sign of the times.....
Replies: 3
Views: 1794

Re: Not MGB related but just a sign of the times.....

I once saw a MX5 with a sticker 'No hairdressing products left in this vehicle overnight'
by Paul Hollingworth
Fri Feb 28, 2020 4:43 pm
Forum: MGB General
Topic: WANTED Banjo axle diff
Replies: 16
Views: 5775

Re: WANTED Banjo axle diff

If the axle has half shafts in then you could do one turn on the halfshaft (remembering to lock the other one) and see how many turns the input flange does. With the banjo type it looks like you would have to remove the halfshafts to get it apart and even then you might not be able to see the pinion...