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Advanced Dizzy


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#1 malc_west

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Posted 23 February 2021 - 08:32 PM

Looking in to how far to advance a dizzy on a supercharged 1275 metro engine running standard cam and a hif 44 carb.
Any advice is much appreciated

#2 Turbo Phil

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Posted 23 February 2021 - 11:32 PM

Something like 22-24deg maximum advance would probably be ok. But there’s so many influencing factors (fuel octane, charge temps, compression ratio etc) it would be best to get it on a rolling road to determine what’s safe.

Phil.

Edited by Turbo Phil, 23 February 2021 - 11:34 PM.


#3 malc_west

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Posted 24 February 2021 - 06:55 AM

Something like 22-24deg maximum advance would probably be ok. But there’s so many influencing factors (fuel octane, charge temps, compression ratio etc) it would be best to get it on a rolling road to determine what’s safe.

Phil.

cheers Phil, so should I finish the build as it is check it fires up and then get.it trailered to a specialist rolling road?

#4 Turbo Phil

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Posted 24 February 2021 - 06:17 PM

Are you buying a complete kit from the likes of Vmax etc? If so they should be able to give you some more accurate guidelines. But even so it’s probably advisable to get it to a good rolling road as soon as possible, it’s extremely easy to cause damage on a boosted engine.

Phil.

#5 malc_west

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Posted 25 February 2021 - 08:23 PM

Hi Phil it's a vmax kit but second hand so I'm feeling my way through it with the help of the forum and youtube. Once built I was going to take it to a specialist road and get it tuned and checked. Fingers crossed it'll be good. But at the very least it's kept me sane in lock down

#6 HUBBA.HUBBA

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Posted 03 March 2021 - 10:42 AM

This what you need.

 

www.ebay.co.uk/itm/Powerspark-Classic-1275-59D-Electronic-Distributor-for-Mini-and-Metro-D10-75/122102920950

 

Set it to 24 deg advance at 4000rpm with the vacuum advance unplugged. Then reattach the vacuum pipe. It'll retard perfectly under boost. People (I was one of them) try to be all cleaver fitting fancy ignition curve systems that in reality make sod all difference and is more to go wrong. People will spout on about having too much slack in the dizzy drive compared to a trigger wheel, but i real life driving you wont notice the difference. Perhaps on a highly tuned, high revving race engine, yes. But for normal sane people, no.


Edited by HUBBA.HUBBA, 03 March 2021 - 10:51 AM.


#7 mini13

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Posted 03 March 2021 - 10:49 AM

why is that what he needs??



#8 HUBBA.HUBBA

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Posted 03 March 2021 - 10:55 AM

 

why is that what he needs??

 

Elect dizzy for a decent spark, the vacuum advance works well when retarding. by the way - my source of this Info/guidance is Stuart Gurr. Its what he has on his own car. Works a treat.



#9 Rhcp4life

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Posted 03 March 2021 - 02:57 PM

Following



#10 malc_west

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Posted 21 March 2021 - 05:16 PM



This what you need. https://www.ebay.co....75/122102920950

why is that what he needs??
Elect dizzy for a decent spark, the vacuum advance works well when retarding. by the way - my source of this Info/guidance is Stuart Gurr. Its what he has on his own car. Works a treat.
Cheers mate, my car's booked in at regency autos to have the carb and timing sorted do you reckon I should buy and fit this dizzy 1st?




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