5 replies to this topic

[holmesy]

this us one for the more technical of us

what im after is the advance curves for some dizzy's I know my mg metro dizzy pulls very well in my hot 1310 but I know it can be tweaked to improve. im running mappable ignition so I want to transfer the data over. I'll also make up the maps for other dizzy's for people that need a better base map on their mappable ignition system.

I would like :

mg metro 1275

aldon red and yellow and any of their custom ones would be great if you have the specs of them.

standard 1275

standard 998

and metro turbo

if you have anything else then please don't hesitate. Thank you

[KernowCooper]

Have a look at some I have may help

Attached Files

•  Early Distributors Advance Curves.jpg   81.45K   247 downloads

[carbon]

Following data from ARG Metro repair manual supplement AKM4694/8 (1984).

 

MG Metro 1300 and Vanden Plas with 10.5:1 CR, Lucas 59D4, 41979

20-22 deg @ 4800

14-18 deg @ 2800

10-14 deg @ 1500

4-8 deg @ 1000

0-2 deg @ 600

no advance below 400 (all above are in crankshaft rpm)

Vacuum advance 6-12-9 (starts at 6inHg, ends 12inHg, total 18 degrees crank advance)

Timing at 10 deg btdc @ 1500 rpm, vacuum disconnected

 

Metro 1300  HLE with 9.75:1 CR, Lucas 59D4, 41938

16-20 deg @ 5500

10-14 deg @ 4000

2-10 deg @ 2000

0-2 deg @ 1000

no advance below 500 (all above are in crankshaft rpm)

Vacuum advance 6-15-9 (starts at 6inHg, ends 17inHg, total 18 degrees crank advance)

Timing at 9 deg btdc @ 1500 rpm, vacuum disconnected

 

Vanden Plas 1300 with 9.4:1 CR, Lucas 59D4, 41864

24-28 deg @ 5200

23-27 deg @ 4800

16-20 deg @ 2500

8-12 deg @ 1600

0-4 deg @ 700

no advance below 300 (all above are in crankshaft rpm)

Vacuum advance 3-9-8 (starts at 3inHg, ends 9inHg, total 16 degrees crank advance)

Timing at 11 deg btdc @ 1500 rpm, vacuum disconnected

 

MG Metro Turbo, Lucas 59DM4 electronic, 41932B

15-19 deg @ 4900

13-17 deg @ 3900

11-15 deg @ 2800

9-13 deg @ 2300

2-6 deg @ 1400

no advance below 600 (all above are in crankshaft rpm)

Vacuum advance 1-7-12 (starts at 1inHg, ends 7.5inHg, total 24 degrees crank advance)

Timing at 7 deg btdc @ 1500 rpm, vacuum disconnected

 

Metro 998, 8.3:1 CR, Lucas 59D4, 41857

20-24 deg @ 4800

14-18 deg @ 2800

10-14 deg @ 1500

0-2 deg @ 600

no advance below 400 (all above are in crankshaft rpm)

Vacuum advance 4-11-7 (starts at 4inHg, ends 11inHg, total 14 degrees crank advance)

Timing at 15 deg btdc @ 1500 rpm, vacuum disconnected

 

Metro 998, 9.6:1 CR (99H907P), Lucas 59D4, 41857

16-20 deg @ 4800

11-15 deg @ 2800

3-7 deg @ 1500

0-2 deg @ 600

no advance below 400 (all above are in crankshaft rpm)

Vacuum advance 3-9-8 (starts at 3inHg, ends 9inHg, total 16 degrees crank advance)

Timing at 15 deg btdc @ 1500 rpm, vacuum disconnected

 

Metro 998, 10.3:1 CR (99HA06P), Lucas 59D4, 41857

20-24 deg @ 4800

14-18 deg @ 2800

10-14 deg @ 1500

0-2 deg @ 600

no advance below 400 (all above are in crankshaft rpm)

Vacuum advance 4-11-7 (starts at 4inHg, ends 11inHg, total 14 degrees crank advance)

Timing at 7 deg btdc @ 1500 rpm, vacuum disconnected

 

Metro 998 HLE, 10.3:1 CR (99HA06P, 99HA08P), Lucas 59D4, 41907

16-20 deg @ 4800

15-19 deg @ 4000

13-17 deg @ 3300

11-15 deg @ 2800

6-10 deg @ 2000

3-7 deg @ 1500

1-5 deg @ 1200

0-2 deg @ 600

no advance below 400 (all above are in crankshaft rpm)

Vacuum advance 3-9-8 (starts at 3inHg, ends 10inHg, total 16 degrees crank advance)

Timing at 7 deg btdc @ 1500 rpm, vacuum disconnected

[holmesy]

thank you both very much. I'll get making some maps :) still looking for a performance dizzy advance curve if anyone has some. I will have a look on aldon's website at lunch

[ACDodd]

Why on earth are you using dizzy maps?  Doing a full map is nothing like a dizzy map, thats the whole popint of having a mappable system.

 

Have it mapped you won't look back.

AC

[holmesy]

im building some base maps to get basic setups running correctly. mine goes on the rr on the 29th