Weber selection and initial jet tuning

[moelk]

9 minutes ago, blodi said:

Going to the dyno on Monday finally. I'll be sure to post the results. Car has been running great! 

Looking forward to it.

[240260280]

Ditto.  Glad it is working well and it will be nice to see the numbers.

 

Also a useful data set would be to record a street run using your A/F meter before or after the dyno run then compare to what the dyno a/f gives.

 

You may want to bring a selection of main jets to move the a/f up or down at the dyno. If you have lots of time and runs, a comparison of  F16 Etube vs F19 E tube with same air and fuel jets would be useful to see if F19 is "the one".

 

 

[240260280]

Just another thought.  What is the cam sprocket set to on your Z?   I wonder  if moving it will affect rich dip (possible exhaust event cause) at onset of run?  It could be something to play with this summer to completely flog this horse!

Edited June 14, 2019 by 240260280

[blodi]

I just have it scheduled for two power pulls. To do any tuning you need to rent the dyno for like half a day $$$.   Cam sprocket is stock and non adjustable. 

[240260280]

Super. For the cam sprocket, is it on position 1,2 or 3?

[blodi]

I didn't realize there were different positions. 

[blodi]

Now I found this info....I had no idea.....interesting.... 

https://www.zcar.com/forum/10-70-83-tech-discussion-forum/125282-cam-timing.html

I can try to take a look this weekend. 

Edited June 14, 2019 by blodi

[240260280]

BE CAREFUL. Chain tensioner must not pop out!

 

 

http://atlanticz.ca/zclub/techtips/timing/mechtime.html

 

 

[blodi]

I got bumped from the Dyno until next Saturday now.  Still haven't had a chance to look at the cam position. I do have a timing chain wedge tool if I do get a chance to look at it. 

 

[blodi]

Results are in!  195 rwhp and 175 Rwtq. 

Stock engine/carb setup made 128 rwhp on the same dyno 3 years ago.

It was breaking up a bit at the top end. Not sure if that is from fuel or ignition.  I’m not running a return line from the carbs...should I?  Or do I need an MSD or something ? Just running a perteonix electric point conversion.  

I still need to download the logs from the wideband. 

[240260280]

Weird, I was just thinking of you and this earlier today.  Must have been ths Z FORCE.

 

195RWHP is F'n AWESOME!!!!!

 

For the high RPM scatter, usually a distributor refresh with lube can help the high end.  Sometimes the spindle teeth meshing with the worm on crank snout cause timing variation at high rpms according to Frank Honsowetz. He recommends brass teeth. Also it could be poor electronic components in the Pertronix.

[240260280]

Did the Dyno use a wideband?  It would be interesting to compare.

I wonder where you can get 5 more HP?