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MG TD TF 1500 distributor springs BBS discussion at MG-Cars.info
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MG TD TF 1500 - distributor springs
| hello.I would like your comm ents and advice re distributor D2a40368 specially the size of the advance springs. Thank you in advance. Picture. thoralf. NORWAY. TD 4490 
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| Thoralf Sorensen (TD4490) |
| Thoralf
I don't know much about TD's but I would think the springs in that dist. are way too heavy/strong Specially the heavier one--normally you would see more movement available in the long slot of the that heavier spring The smaller spring usually works alone up to say 2500 engine revs and then the stronger one contacts the peg and works from then on Having said that, the advance curve of these old distributors even in perfect original condition needs changing to suit modern fuels I would suggest something like Idle----10-12deg Fulladvance--34-35deg total and all finished by 3000-3500rpm The original advance curve was set up for very low octane fuel A good modern distributor advance curve will make a big difference to how your car goes willy |
| William Revit |
| Hi Willy What’s a good modern distributor advance curve please?? Thanks John |
| J A Davies |
| John Compared to a std. TD curve, which when new didn't complete it's advancing till about 5000 revs to allow for running the fuel of the time which was only about 70-something octane--- A more modern curve as mentioned with- 10-12 idle and 34-35 total advance all up and all finished by not much after 3000 is more suitable for these engines on today's fuel willy |
| William Revit |
| One spring is supposed to be thicker than the other. Most I have seen the thick spring has a longer eyelet which allows advance to be controlled by the small spring until higher revs, then the strong spring engages. It appears your strong thick spring is already engaged, which would prevent advance at lower RPMs. |
| George Butz |
| Buy some new springs from the Distributor Doctor. He will sell you the correct ones, they don't cost very much and they will make a big difference to the running of the engine. Jan T |
| J Targosz |
This thread was discussed between 29/10/2017 and 01/11/2017
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