I have a new 34 pict-3 that has no hole in the upper right spot where a vaccum port should be. There is the place for it, just not drilled. I need the upper vaccum for my auto-stick. Can I drill the hole through? If so, what size hole should it be?
Eddie. ???
I did this modification. I did mine with a 2mm, though a 1mm or 1.5mm might be better.
won't you be able to use the left front vacuum port?
this is the left port I was pertaining to.
That port must be larger or below the butterfly. If I try that port, it lets the clutch out really hard.
Eddie/Dennis,
You will find that particular port runs all the way down to below the butterfly. It's a vacuum retard port for the DVDA distributors. Hook your CV feed to that and your shift's will pretty well be rubbish.
In answer to Eddies same question on Thesamba :
Drill a 4mm hole, 8mm deep into the blank boss. Drill through to the venturi with a 2mm drill. The spigot should have a "jet" inside it of 1.5mm. You'll either have to shut off one end (if you use typical 4mm OD x 3mm ID tube) to close it down to 1.5mm or (in Dennis' case) you could use a Mig gun tip of 1.4mm wire size, bore that to 1.5 and turn the OD down to fit. I hope you didn't lose it already ;D
The only real critical part is the 1.5mm "jet" in your spigot, the through hole would be nice since 2mm is the standard size.
You need to have 5-6 in/Hg to fully activate the CV diaphraghm when you open the throttle to accelerate.
I put my spigot in using Loctite Super Bearing mount. You could pein it in if you wanted to.
Volkenstein
Thanks Volkenstein. I am going to do that and will post my results. Thanks again.
Eddie.
Hiya Eddie,
Sean's (Volkenstein) advice is right on target, as usual. However to help a bit with translation (he's down in Oz) this might be helpful........ I used a 3/16 bit to drill into the boss and finished it out with a 9/64. Worked quite well for me.
Thanks Mike. I was just going to a conversion chart. Ha.
Eddie.