OzVMX Forum

Marque Remarks => CZ => Topic started by: tony27 on February 04, 2017, 02:22:59 pm

Title: 400 Falta timing
Post by: tony27 on February 04, 2017, 02:22:59 pm

I've just received a Falta head to go with my Southbay modded Falta cylinder & have come across a couple of different ignition timing figures
Some sources like the Clymer manual say all 380s/400s should be timed 3.4-3.6mm but I've also seen a spec sheet that listed the Faltas as 3.8-4.0mm
Compression on the Falta was listed as being higher than the earlier models
What sort of timing figure are people using in their Faltas?

Title: Re: 400 Falta timing
Post by: tony27 on February 05, 2017, 04:33:38 pm

Something strange I came across today, normal B8HS sits 2 or 3 threads up but a B8ES sticks out by about the same amount. I think the easiest way around this will be to turn up a 2.5mm thick washer to run under the longer reach plug

(http://i788.photobucket.com/albums/yy166/tony27_photo/CZ%20981%20random%20stuff/Falta%20head/20170205_103822_zpsi9ajtezm.jpg) (http://s788.photobucket.com/user/tony27_photo/media/CZ%20981%20random%20stuff/Falta%20head/20170205_103822_zpsi9ajtezm.jpg.html)
1/2" reach plug fitted
(http://i788.photobucket.com/albums/yy166/tony27_photo/CZ%20981%20random%20stuff/Falta%20head/20170205_103621_zpszxxifnas.jpg) (http://s788.photobucket.com/user/tony27_photo/media/CZ%20981%20random%20stuff/Falta%20head/20170205_103621_zpszxxifnas.jpg.html)
3/4" reach plug fitted

Title: Re: 400 Falta timing
Post by: Wasp on February 05, 2017, 05:14:43 pm

Tony , make the spacer with a inside thread , so it can not fall off by mistake . Especially if you are in the pits or in a hurry .  I have to do the same on my 998 engines to clear the valves .

Title: Re: 400 Falta timing
Post by: tony27 on February 07, 2017, 07:41:13 pm

Unfortunately now that I don't work as a toolmaker I don't have access to a 14mm spark plug tap, will just bore it to a good size over the thread

Title: Re: 400 Falta timing
Post by: tony27 on July 01, 2017, 11:55:22 am

3.5mm spacer lined things up nicely
(http://i788.photobucket.com/albums/yy166/tony27_photo/CZ%20981%20random%20stuff/Falta%20head/Long%20reach%20plug%20with%20spacer_zpsfrjbzewh.jpg) (http://s788.photobucket.com/user/tony27_photo/media/CZ%20981%20random%20stuff/Falta%20head/Long%20reach%20plug%20with%20spacer_zpsfrjbzewh.jpg.html)
Picked up another Falta head that has the same machined recess, haven't tried a plug yet to see if the same problem exists