 Mallory Unilite Distributor, Where to attach the vacuum line? |
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| Joseph Mills |
 Sep 5 2003, 04:40 PM
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#1
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on a Sonoma diet now...  Group: Members Posts: 1,482 Joined: 29-December 02 From: Oklahoma City, OK Member No.: 39  |
Am finally going to install my Mallory Unilite distributor (w/vacuum), and HYFIRE CD box.
I installed the lighter gray springs that alters the advance curve that is more suitable for the T4. As I understand it, the vacuum line will improve gas mileage a bit and run a little cooler also, while improving the smoothness of throttle response. Here is my delimma: The 44 IDFs I previously installed came with an extra hole tapped with about a M4 screw, which I assumed could be removed and fitted with a brass nipple and used for the vacuum line. However, I have not been able to locate a small enough brass fitting (for the vacuum line) to fit into that small a hole in the carbs. I've checked hardware stores & FLAPS with zip results. Anyone know of a source for such a small size? I am wondering if that small a size will even allow enough air to work? An alternative I'm considering is just drilling a larger hole in the manifold itself and tap it for a larger fitting. Any reason why this wouldn't work? Anyone have experience with this? Good idea? Bad idea? Any advice mucho appreciated! (IMG:style_emoticons/default/pray.gif) |
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| Mockmaw |
Sep 6 2003, 01:12 AM
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Member Group: Members Posts: 163 Joined: 18-March 03 From: Berkeley/San Diego, CA Member No.: 438 |
Uhh, my understanding is that you just remove the screw and slip your vacuum line over the brass extension.. that's how I've done it at least. Unfortunately, I don't have a shot of my carbs to show you what I'm talking about.
When you speak of a hole that's tapped... is it just hole in the side of your carb with a screw in it, or is the screw inserted into a small brass fitting that extends about 3/4" from the carb body? |
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| Joseph Mills |
Sep 6 2003, 07:26 AM
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#3
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on a Sonoma diet now... Group: Members Posts: 1,482 Joined: 29-December 02 From: Oklahoma City, OK Member No.: 39 |
QUOTE(Mockmaw @ Sep 6 2003, 01:12 AM) When you speak of a hole that's tapped... is it just hole in the side of your carb with a screw in it, or is the screw inserted into a small brass fitting that extends about 3/4" from the carb body? Yes, it is a hole in the side of the carb with a screw in it. It is listed in my Tomlinson weber manual as a "blanking" screw. It is immediately to the right of the idle mixture screw. To the left of the idle mixture screw is the air bypass screw. My carbs do not have a brass fitting that extends 3/4". This blanking screw is about 4mm, or 3/16" - just doesn't seem like there is much room there for an air passage. I'm beginning to think that this "blanking" screw location is not intended for a vacuum line? If I drill and tap a hole in the manifold, any idea as to the size it should be? Thanks. |
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| Tom Perso |
Sep 6 2003, 08:47 AM
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#4
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Crazy from the Cold... Group: Members Posts: 647 Joined: 8-August 03 From: Kalamazoo, MI Member No.: 1,003 |
I think you have an old set of 44's. They did not have vac. fittings.
The question is, I think you need vaccum *above* the throttle plates - I need to do some research to find out what works the best. The new 44 IDF's with vac. connections have a small hole that is just above the throttle plates in the carb body. Lemmi find out. Tom |
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