AC canister vacuum?
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AC canister vacuum?
Fat chance I’ll get an answer but here goes: I have a 1970 Caprice with a 350 and air conditioning. It has a vacuum canister to run the dashboard selector for heat or cool. Wondering if anyone knows the minimum vacuum needed to run this control as I am modifying the engine which will drop the vacuum to 15 inches. Will I need a vacuum assisted pump?
Last edited by 70caprice; May 15, 2021 at 8:03 AM.
CF Monarch
Joined: Jul 2011
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From: kevinkpk
Fat chance I’ll get an answer but here goes: I have a 1970 Caprice with a 350 and air conditioning. It has a vacuum canister to run the dashboard selector for heat or cool. Wondering if anyone knows the minimum vacuum needed to run this control as I am modifying the engine which will drop the vacuum to 15 inches. Will I need a vacuum assisted pump?
CF Junior Member
Joined: Jun 2014
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The idea is that the vacuum reservior will be drawn down
to "peak vacuum" (checkball feed) so that you have useful
vacuum reserve for next braking.
If you -never- get above 15"Hg vaccum then a pump might
be handy. But cams only depress low-RPM vacuum and
normal driving may be enough to keep the reservoir
"charged".
to "peak vacuum" (checkball feed) so that you have useful
vacuum reserve for next braking.
If you -never- get above 15"Hg vaccum then a pump might
be handy. But cams only depress low-RPM vacuum and
normal driving may be enough to keep the reservoir
"charged".
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