Re: Treadle Vac Conversion
Posted by HH56 On 2022/2/3 12:23:32
One thing I am curious about with the small 5/8 bore master is the total fluid volume out with the stroke that will be available. On one of the earlier posts where the 3/4 master was tried, a comment that some of the Stude conversions did not allow a full stroke to actuate both pistons in a dual master was noted. I would wonder about that here too -- particularly with any kind of decreased stroke forced by the ratio change.
As to volume, during some of my early experiments a crude test measured the BTV output at approx 20ml at full stroke. A properly adjusted drum arrangement should be able to cope with some reduced volume but if any disc conversion is also contemplated then I would be concerned.
The decreased stroke was one of the issues I ran into with some of my experiments. To compensate I made extensions to mov the pedal pivot higher and outward. Due to the AC that part was limited but I was able to lengthen the arm to increase the ratio as well as made the arm angled to raise the pedal from the normal location relative to the floor board to get more stroke. That location also requires the foot to lift but at least the pedal pad stayed in the same relative position adjacent to the accelerator -- similar to where a manual brake pedal would be so was not a very noticeable change.
If I were able to do any more experiments (age makes that less probable) I would like to redo what I have now because the current arrangement is much too sensitive. What I would like to do is revise the current linkage to use an Electroboost instead of using the vacuum booster now on the car. I currently have the booster and master mounted at a severe angle pointing to the starter and to get the decent ratio, the takeoff and a bellcrank is hidden in the vent opening (vent is still totally functional because of factory AC) with the actuating rod going down to the booster. I would like to mount an Electroboost at the same level as the bellcrank but at 90 degrees parallel to the firewall where it could be hidden under the AC blower or at least be much less visible than the current vacuum booster conversions which use the vent space. The current vent conversion is not possible with AC because the vent is needed.
Here are a couple of shots in mockup and in the car. As I mentioned, still a work in progress.
Attach file:
IMG_0280.jpeg (94.38 KB)
IMG_0285.jpeg (41.44 KB)
IMG_0300.jpeg (117.39 KB)
IMG_0292.jpeg (105.67 KB)
IMG_2514.jpeg (184.32 KB)
IMG_2516.jpeg (217.75 KB)
As to volume, during some of my early experiments a crude test measured the BTV output at approx 20ml at full stroke. A properly adjusted drum arrangement should be able to cope with some reduced volume but if any disc conversion is also contemplated then I would be concerned.
The decreased stroke was one of the issues I ran into with some of my experiments. To compensate I made extensions to mov the pedal pivot higher and outward. Due to the AC that part was limited but I was able to lengthen the arm to increase the ratio as well as made the arm angled to raise the pedal from the normal location relative to the floor board to get more stroke. That location also requires the foot to lift but at least the pedal pad stayed in the same relative position adjacent to the accelerator -- similar to where a manual brake pedal would be so was not a very noticeable change.
If I were able to do any more experiments (age makes that less probable) I would like to redo what I have now because the current arrangement is much too sensitive. What I would like to do is revise the current linkage to use an Electroboost instead of using the vacuum booster now on the car. I currently have the booster and master mounted at a severe angle pointing to the starter and to get the decent ratio, the takeoff and a bellcrank is hidden in the vent opening (vent is still totally functional because of factory AC) with the actuating rod going down to the booster. I would like to mount an Electroboost at the same level as the bellcrank but at 90 degrees parallel to the firewall where it could be hidden under the AC blower or at least be much less visible than the current vacuum booster conversions which use the vent space. The current vent conversion is not possible with AC because the vent is needed.
Here are a couple of shots in mockup and in the car. As I mentioned, still a work in progress.
Attach file:
IMG_0280.jpeg (94.38 KB)
IMG_0285.jpeg (41.44 KB)
IMG_0300.jpeg (117.39 KB)
IMG_0292.jpeg (105.67 KB)
IMG_2514.jpeg (184.32 KB)
IMG_2516.jpeg (217.75 KB)
This Post was from: https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?post_id=240866