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#1
02-24-2026, 08:25 PM
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WOT manifold vaccum
Probably discussed previously but I got tired searching.
What is an ideal manifold vacuum at WOT? I read some online blurb where a guy was using manifold vacuum to size a carb. That is a WOT vacuum of 3" would indicate the carb is too small and is creating too much restriction. Currently my vacuum goes to 0" when I go WOT. 825 Demon on a 461. Frank
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Frank M. 75 Firebird 68 Firebird 400 RAIII 66 Chevy II 461 Pontiac in AZ |
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#2
02-24-2026, 09:37 PM
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0.5" or less is ideal
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#3
02-25-2026, 05:29 AM
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As stated in the above, for maximum wide open throttle hp .5 hg.
Attaining this though can leave you with degraded torque production in lower rpm ranges . For pure street motors only that are making 500 hp or less out of 400 cid or less I would live with 2 inches hg .
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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