Mi16 New Dizzy Problems .

[Dazza 4]

Hi Guys , not been around for a while however ive a bit of a pain in the u know what with the 205 MI and need some assistance.

 

Ive a 205 MI16 Carb'ed track car and machanically its 100% , no problems there.

 

However there is a niggle that i simply cant resolve albeit obviously i believe its the dizzy

 

PROCESS OF TWIDDLEMENT !!!

 

New Recon uprated ( to suit adv curve of tuned engine) Dizzy Number 1 fitted , car tick's over and revs great , take it on the road and the tacho reaches 3-3500 and starts playing up and doesnt register true rev's kind of catching up sort of thing . Car goes like a rocket though ....

Secondary problem , Omex clubman shift light coming all light blackpool tower all the time at any revs and soft cut in and out causing mis-fire ....Doesnt like this dizzy at all , works fine with my standard dizzy.

 

Ok so , Fit old dizzy , problem fixed 100% ...."ok its the Dizzy" ....elimination thoughts and so on, car not as lively though.

 

Send Dizzy back to man who re-conned it and tell of tale of woes ...ok same dizzy back to me with new sender fitted ..checked by recon man says it 100% now ...

 

Fit to car ...same problem ! me not happy ....sends it back ...to same man ....

 

Totally new one arrives with ign amplified bolted to the dizzy housing ( very nicely done) , ok re-wires amp and fits to car ....same problem revs fine on driveway however take on the roads ...funny tacho readings ...and the whole Omex lights and soft cut all over the place .....pop .... pop ....

 

Speaks to recon man and he says the dizzy cant do that ..me says yes it is ... ok he tells me to fit a 12v to 9v surpressor or a 0.1 microfarrad capacitor and earth the dizzy plate to clean the signal up as the omex is reading the same dirty signal the rev counter is experiencing , yes i agree with this point as they share a common feed from the - on the coil.

 

I havent done this just yet as nobody sells these things anymore or at liest i cant find anyone yet...

 

Can you assist me guys whats your thoughts ? its coming spring and the trackdays are coming ....

 

The car goes much better with the uprated dizzy and that why i want to sort this one out, i know its this new dizzy but .....

Edited March 26, 2009 by Dazza

[Dazza 4]

As i thought its looking like a spike or interference from either a bad earth or some part of the altenator charging system .Iam going to be checking the HT side next just as a precaution as nothing can be out ruled.

Sounds strange but my local retired auto electrician says all dizzy's are different in relation to interference loadings and this one could be showing this as the rev's load the system more.

Edited March 28, 2009 by Dazza

[Tom Fenton 1,542]

Definitely sounds like interference, try running the wiring from dizzy to loom in shielded cable with the shield tied down to earth at one end only and see how you get on.

[Dazza 4]

Definitely sounds like interference, try running the wiring from dizzy to loom in shielded cable with the shield tied down to earth at one end only and see how you get on.

 

Ok Tom i will do , ive earthed the dizzy body today and took it 200 yds down the street albeit this isnt a true test.

 

Didnt have any problems though ...here's hopes its sorted ....

[Dazza 4]

Had a little play with the car and noticed that if i carefully remove any one of the negative spade connections on the coil the car cuts out ?

 

Is this correct as I was only aware this would happen on the positive side of the coil .

 

I have noticed the new dizzy is a newer model number and has minor differences in appearance , I wondered if this dizzy was ok or would cause compatability issue's ?

If i fit the old dizzy there are no problems what so ever its 100% perfect , rev counter is great and omex is great . JOB DONE ...

 

Why would 2 newly reconditioned dizzys give me these problems when iam told that they have only replaced everything for new and installed different weights and springs to allow more advance curve from static to full advance.....beats me .....

 

Iam giving serious thought to binning the new dizzy as i doubt a refund will be offered as they say its perfect which i have my thought on .....

 

If i was to fit the old dizzy and adjust it to give me the 32 degrees advance top end or as much advance pre pink symtoms would this match the modded dizzy's performance .

 

People have metioned fitting surpressors and all kinds , but whay does my 15 year old dizzy work 100% and 2 new £200 dizzy's dont ?

 

Whats your thoughts..

[PVFCpug 6]

Had a little play with the car and noticed that if i carefully remove any one of the negative spade connections on the coil the car cuts out ?

 

Is this correct as I was only aware this would happen on the positive side of the coil .

 

I have noticed the new dizzy is a newer model number and has minor differences in appearance , I wondered if this dizzy was ok or would cause compatability issue's ?

If i fit the old dizzy there are no problems what so ever its 100% perfect , rev counter is great and omex is great . JOB DONE ...

 

Why would 2 newly reconditioned dizzys give me these problems when iam told that they have only replaced everything for new and installed different weights and springs to allow more advance curve from static to full advance.....beats me .....

 

Iam giving serious thought to binning the new dizzy as i doubt a refund will be offered as they say its perfect which i have my thought on .....

 

If i was to fit the old dizzy and adjust it to give me the 32 degrees advance top end or as much advance pre pink symtoms would this match the modded dizzy's performance .

 

People have metioned fitting surpressors and all kinds , but whay does my 15 year old dizzy work 100% and 2 new £200 dizzy's dont ?

 

Whats your thoughts..

 

Having a very similar problem. MI16 on 45's with 8v Dizzy conversion. Killed old engine about 14 month ago and had new one built, decided to add external Omex Clubman limiter and set this to 7,700rpm. With this fitted I get soft cut off at anything ranging from 4.5K through to 6K but certainly not 7.7K. So far have added extra earthing to complete ignitin system, new ignition amp, new coil, new dizzy cap and rotor, new three wire cable from dizzy-amp, new leadset x 2.

 

Rev counter with or without Omex is fine up to approx. 4K then only very slowly increases bearing no relation to actual revs. Without Omex all is well and she pulls like a train, add the Omex and everything turns to rats*it. Have tried shielding to no avail. Next step is an Omex 100 I have come across with a coilpack but not sure which one would work. Also given that there is a hole in the right place for a CPS on the gearbox is it simply a matter of trial and error or does it have to be a certain CPS to work.

 

Should be fun as this Omex was fitted to a very similar engine so should run with map already in it.

 

Seems to me the only route is get rid of the dizzy!

[Dazza 4]

URRRRRRRRRRRRRR ... SO WE HAVE A COMMON PROBLEM THEN ! NEED TO SPEAK MATE ...

[Dazza 4]

Hi PVFC , just a quick ne , Who built this Dizzy for you and what was the spec .ie was the weights and springs altered to suit your 16v engine ?

 

Iam gathering this from your explanation that this is not the dizzy you had on the origional 16v Mi16 engine .

 

Iam 99% sure ive got to the bottom of this now, just need a reply to confirm this from you .

[Dazza 4]

Hi PVFC , just a quick ne , Who built this Dizzy for you and what was the spec .ie was the weights and springs altered to suit your 16v engine ?

 

Iam gathering this from your explanation that this is not the dizzy you had on the origional 16v Mi16 engine .

 

Iam 99% sure ive got to the bottom of this now, just need a reply to confirm this from you .

 

 

Now resloved .