VC1862 vacuum cannister install
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Joined: Sep 2004
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From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
VC1862 vacuum cannister install
well got around to installing the vacuum cannister Mr Lars recommended, just had to wait for the local Napa warehouse to have it in stock so i didn't have to pay for shipping ....which was as much as the unit....heres the pictorial scoop about 8 mins worth of work...very easy to install
heres the scoop, this is a comparison of the vacuum cannisters under a load condition, it is the same initial timing,i didn't change anything other then switch vacuum cannisters: (gear/degrees/inches of vacuum/rpm): with the proform adjustable vacuum cannister connected R/35*/17"/800 rpm, N/35*/17"/1000, D/35*/15"/800
with the VC1862: R/44/14"/850, N/44*/17"/1100, D/44*/14"/900
for some reason my base timing is higher then before with the new cannister, i am theorizing this is because the plunger rod of the new cannister is a little longer then the old cannister increasing the timing , so i reset everything with vac can disconnected to base timing of 22* at 900 rpm ,this gave me 24*/1100,26/1300, 28/1500, 30/1700,32/1800, 34/2000, 36*/2400. with vac can connected it gave me 39*/1000/18"...i will drive it tomorrow and test it all then re adjust speed demon for the new cannister
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heres the scoop, this is a comparison of the vacuum cannisters under a load condition, it is the same initial timing,i didn't change anything other then switch vacuum cannisters: (gear/degrees/inches of vacuum/rpm): with the proform adjustable vacuum cannister connected R/35*/17"/800 rpm, N/35*/17"/1000, D/35*/15"/800
with the VC1862: R/44/14"/850, N/44*/17"/1100, D/44*/14"/900
for some reason my base timing is higher then before with the new cannister, i am theorizing this is because the plunger rod of the new cannister is a little longer then the old cannister increasing the timing , so i reset everything with vac can disconnected to base timing of 22* at 900 rpm ,this gave me 24*/1100,26/1300, 28/1500, 30/1700,32/1800, 34/2000, 36*/2400. with vac can connected it gave me 39*/1000/18"...i will drive it tomorrow and test it all then re adjust speed demon for the new cannister
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Last edited by bobs77vet; May 28, 2005 at 06:13 AM.
Thread Starter
Race Director
Joined: Sep 2004
Posts: 11,874
Likes: 263
From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
good morning , heres where we are today
played around for hopefully the last time and this is what we have:
19* base timing, v/c disconnected, heres the advance curve
20/1200, 22/1300, 24/1400, 26/1500,28/1700, 30/1800, 32/1900,34/2300, 36/2400......38/3300 and its maxed out
vac can hooked up in park 35*/1050/18" of vacuum
so then i adjusted carb and this is what i got
Park, 35*, 975-1025, 17+"
Reverse, 750-775, 14"
Neutral, 975-1025, 17+"
drive, 750-800, 14"
and i discovered that my cars tach is off by about 200rpm compared to my tuneup meter...
so i have 19* base + 17 centrigugal + 16 vacuum= 52*
with the 36 centrifugal coming in at 2400...and and extra 2* at 3300
eng specs, 355, xe268h, fuelie heads, speed demon, headers,2 1/2 duals, performer intake
played around for hopefully the last time and this is what we have:
19* base timing, v/c disconnected, heres the advance curve
20/1200, 22/1300, 24/1400, 26/1500,28/1700, 30/1800, 32/1900,34/2300, 36/2400......38/3300 and its maxed out
vac can hooked up in park 35*/1050/18" of vacuum
so then i adjusted carb and this is what i got
Park, 35*, 975-1025, 17+"
Reverse, 750-775, 14"
Neutral, 975-1025, 17+"
drive, 750-800, 14"
and i discovered that my cars tach is off by about 200rpm compared to my tuneup meter...
so i have 19* base + 17 centrigugal + 16 vacuum= 52*
with the 36 centrifugal coming in at 2400...and and extra 2* at 3300
eng specs, 355, xe268h, fuelie heads, speed demon, headers,2 1/2 duals, performer intake
Last edited by bobs77vet; May 28, 2005 at 06:22 PM.
Pro
Joined: Sep 2004
Posts: 579
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From: North Texas
Interesting Bob, thanks.
I'm doing this same project -tuning this weekend. I have to run 30* initial for best vacuum and thought that was crazy but it looks like your running 35* with the vac can.
Have you road tested this? Notice any changes?
I'm doing this same project -tuning this weekend. I have to run 30* initial for best vacuum and thought that was crazy but it looks like your running 35* with the vac can.
Have you road tested this? Notice any changes?
Thread Starter
Race Director
Joined: Sep 2004
Posts: 11,874
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From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
Originally Posted by Nate 76x
Interesting Bob, thanks.
I'm doing this same project -tuning this weekend. I have to run 30* initial for best vacuum and thought that was crazy but it looks like your running 35* with the vac can.
Have you road tested this? Notice any changes?
I'm doing this same project -tuning this weekend. I have to run 30* initial for best vacuum and thought that was crazy but it looks like your running 35* with the vac can.
Have you road tested this? Notice any changes?
Thread Starter
Race Director
Joined: Sep 2004
Posts: 11,874
Likes: 263
From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
Originally Posted by lars
Bob -
The numbers all look good. It should run very well for you in that configuration.
Lars
The numbers all look good. It should run very well for you in that configuration.
Lars
