Tunning
Race Director
Joined: Apr 2005
Posts: 11,274
Likes: 2,136
From: Bowling Green, Kentucky
Thread Starter
Drifting
Joined: Jan 2018
Posts: 1,256
Likes: 316
From: Western NY
Update.
Does not matter because Duke suggests swapping my OE VAC for the B26 but I tested my MS 236 16 with a mityvac. The plate appears to begin moving at 4 and is all in at 8 on the Mityvac scale. I let it be while I took a EMS call and when I returned 3 hours later, the vaccume had bleed down to 0. Could have been the tool or the VAC but it seems to hold steady pumped up to 8 for a solid 5 minutes before I had to leave.
Does not matter because Duke suggests swapping my OE VAC for the B26 but I tested my MS 236 16 with a mityvac. The plate appears to begin moving at 4 and is all in at 8 on the Mityvac scale. I let it be while I took a EMS call and when I returned 3 hours later, the vaccume had bleed down to 0. Could have been the tool or the VAC but it seems to hold steady pumped up to 8 for a solid 5 minutes before I had to leave.
Race Director
Joined: Apr 2005
Posts: 11,274
Likes: 2,136
From: Bowling Green, Kentucky
Update.
Does not matter because Duke suggests swapping my OE VAC for the B26 but I tested my MS 236 16 with a mityvac. The plate appears to begin moving at 4 and is all in at 8 on the Mityvac scale. I let it be while I took a EMS call and when I returned 3 hours later, the vaccume had bleed down to 0. Could have been the tool or the VAC but it seems to hold steady pumped up to 8 for a solid 5 minutes before I had to leave.
Does not matter because Duke suggests swapping my OE VAC for the B26 but I tested my MS 236 16 with a mityvac. The plate appears to begin moving at 4 and is all in at 8 on the Mityvac scale. I let it be while I took a EMS call and when I returned 3 hours later, the vaccume had bleed down to 0. Could have been the tool or the VAC but it seems to hold steady pumped up to 8 for a solid 5 minutes before I had to leave.
What this means is that your engine vacuum will have to get down to 7 "HG before the vac can will begin to cut back on the advance. Then at 4 "HG it provides no vacuum advance. So you can see that it want to "hang in there" for a long time during part throttle or wide open acceleration......thus it might create some part throttle detonation as the RPMs increase and the centrifugal advance increases.
The vac can that Duke and Lars recommends will drop out earlier and lessen this possibility.
Larry
Race Director
Joined: May 2000
Posts: 12,712
Likes: 2,270
Update.
Does not matter because Duke suggests swapping my OE VAC for the B26 but I tested my MS 236 16 with a mityvac. The plate appears to begin moving at 4 and is all in at 8 on the Mityvac scale. I let it be while I took a EMS call and when I returned 3 hours later, the vaccume had bleed down to 0. Could have been the tool or the VAC but it seems to hold steady pumped up to 8 for a solid 5 minutes before I had to leave.
Does not matter because Duke suggests swapping my OE VAC for the B26 but I tested my MS 236 16 with a mityvac. The plate appears to begin moving at 4 and is all in at 8 on the Mityvac scale. I let it be while I took a EMS call and when I returned 3 hours later, the vaccume had bleed down to 0. Could have been the tool or the VAC but it seems to hold steady pumped up to 8 for a solid 5 minutes before I had to leave.
It's okay. When I pump them down I just watch the needle for a few seconds and if I can't see it moving, it's good to go.
Duke
