one thing you might want to test before you invest lots of your time is how the PVC material reacts around gasoline. Don’t know the answer to that question. Good luck on your experiment.
jimlj66":33985rwy said:With the venturi out, can you take a hole saw and run through it to open it up? May be easier than trying to build a new one. You could take sand paper and wrap around a piece of pipe or dowel and smooth the bore out after running a hole saw through it.
Creechn32":14m1hhxq said:jimlj66":14m1hhxq said:With the venturi out, can you take a hole saw and run through it to open it up? May be easier than trying to build a new one. You could take sand paper and wrap around a piece of pipe or dowel and smooth the bore out after running a hole saw through it.
The stock Venturi is made of a thin plastic. Before removing this was one of my ideas, just open the stock version up but it just doesn't have the material in place to be able to do it. I did have the idea of opening the throttle bore up just a little. At that point I would need a throttle plate to match though. If this little experiment works out though a person, for very little money could open their stock 1100 up for a performance boost. Could even be done on a multi carb setup. With all my thought process lately I've wondered what two of these carbs ran synchronously and not progressively could do on one of our engines.....
peeeot":2x3ia7l2 said:Creechn32,
The concern with enlarging the Venturi too close to your throttle bore size of 1.4375” is not that you would lose velocity specifically, but that you would weaken the vacuum signal to the main fuel circuit, resulting in poor throttle response and fuel economy. The new insert you are making from PVC needs to imitate the profile of the stock insert you removed, with the narrowest part at the same height as the stock insert so that the booster Venturi cast into the air horn will still be able to amplify the vacuum signal.
All that being said, there is no harm in experimenting, so good luck and have fun!
Georgia200":1seonvhu said:What schedule pipe are you using?
wsa111":1wmkhguk said:Very nice piece of craftsmanship.
You really need to upgrade to a later distributor to take advantage of the extra CFM air flow.
Your 1/4" oil drive is the ???? Either bite the bullet on a DUI or ream the block to .517-.518" so you can use the 5/16" oil drive with an oil pump to match & a distributor @ half the cost.