SUGO CDI for Borut... (ignition curves)

[mellorp]

We have an electronics genius in our midst :-)

[SP]

Really nice data Juergen...! 

Now, can't understand what is going on my SP.. I use TPS fixed to the MAX advance ...

[41juergen]

The elctronic genius here of course are Oliver and Louis, not me...  I'm a mechanical engineer who tries to understand a bit more.
@Neal: you might be right, my boss is telling me several times not to do the "German over engineering" 
So I'm preparing the -40 data into the excel which takes a lot more time as the air solenoids are switched on / off like crazy. Will post soon...

[Yuri]

The cdis are getting close

[41juergen]

Good news Yuri, looks like I will be back already on Thursday evening... so let's see!

[stroker3xv]

If you need i can send you a 9A cdi just let me know

[Yuri]

The cdis have arrived !

[41juergen]

So made the first tests with the -00 and -9A CDI from Yuri. I also reviewed a bit the -10 and -40 data I made some time ago. So here it is... Of course the readings on the degree whell have some inaccuracy, but I let the data as shown. To put them in a programable CDI one have to smooth them out a bit. Will do the -7K next. Challenging are the air solenoid data. At the -00 the jap engineers kept it simple, but for the -40 the guys went nuts...

[Yuri]

Nice this is really interesting !

[Paul]

Well done and such nicely presented data!!
That 9A is Avgas. Surely.

[Yuri]

Well done and such nicely presented data!!
That 9A is Avgas. Surely.

Yes but to make it work the heads must still be cut =
How to process/built-in the cylinder for SS race (94 model)
1) To process Head cylinder
First of all, measure the capacity of combustion chamber. (Spark plug should be NGK BR9ECM)
Then sharpen the face matching to the cylinder until it's 9.5cc capacity of combustion chamber.
When do this, adjust a speed of cutter to make the surface as smooth as it is original, otherwise it could cause a leak of gas/water.
The smallest combustion capacity should be 9.3 otherwise the upper wouldn't grow.
For instance, to sharpen 0.1mm can make 0.25 less in combustion capacity with NGK BR9ECM.
Use the spark plug NGK BR9ECM only for measuring the combustion capacity, not for racing.
(The letters next to the drawing: Shave off this part)
2) To process cylinder
About the extra exhaust port
Make the port width wider as if it's parallel shift. (A part)
Make the pointy part that is caused from processing smooth. (B part)


I think this is the reason thy do so well on unleaded

[ybk]

Nice one Juergen! Interesting to see how much more advance the sugo has vs the other stock cdi's! Pretty much what we expected but now with actual vales makes it very useful. Would be interesting to see the 7K advance values compared to the 9A, seeing that the 7K is for unleaded.

[41juergen]

Thank's to Yuri, he was so kind to send the CDI's... 
And here are the data of the 7K, looks like the Yam engineers tried to put a little more heat into the pipes...

[Yuri]

It can be that the heads are not cut in the sugo manual of the spr so it can use more advance
I will like to see neel's leaded cdi map

[maccas]

Fantastic stuff!!

Dan