Valve overlap and Manifold vacuum
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From: Abilene/Lubbock, TX
Valve overlap and Manifold vacuum
More valve overlap=less vacuum right?
Would around 70 or so overlap provide over 14" of vacuum? can anyone elaborate on the relationship? and what vacuum is required to operate power accessories?
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89 RS parts car
Daily driver 91 RS auto LO3 70k, 14x3 K&N Open element, cat-back delete, Richmond 3.42's, Zexel Torsion posi.
Coming soon: 350, headers, loudmouth exhaust, gutted cat.
Would around 70 or so overlap provide over 14" of vacuum? can anyone elaborate on the relationship? and what vacuum is required to operate power accessories?
------------------
89 RS parts car
Daily driver 91 RS auto LO3 70k, 14x3 K&N Open element, cat-back delete, Richmond 3.42's, Zexel Torsion posi.
Coming soon: 350, headers, loudmouth exhaust, gutted cat.
Thread Starter
Member
Joined: Jan 2001
Posts: 389
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From: Abilene/Lubbock, TX
ttt
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89 RS parts car
Daily driver 91 RS auto LO3 70k, 14x3 K&N Open element, cat-back delete, Richmond 3.42's, Zexel Torsion posi.
Coming soon: 350, headers, loudmouth exhaust, gutted cat.
------------------
89 RS parts car
Daily driver 91 RS auto LO3 70k, 14x3 K&N Open element, cat-back delete, Richmond 3.42's, Zexel Torsion posi.
Coming soon: 350, headers, loudmouth exhaust, gutted cat.
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Joined: Jan 2001
Posts: 1,978
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From: PA
Car: 88 Firebird WS6
Engine: 350 TPI
Transmission: T56
Axle/Gears: 3.42
Duration also plays a role, so overlap isn't the only factor. More duration with less overlap could net less vacuum.
Also the same cam installed in a motor with more cubes will have more vacuum.
And, whether the cam is installed straight up or advanced changes vacuum also...
Also the same cam installed in a motor with more cubes will have more vacuum.
And, whether the cam is installed straight up or advanced changes vacuum also...
Thread Starter
Member
Joined: Jan 2001
Posts: 389
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From: Abilene/Lubbock, TX
Can anyone give some examples, like give your engine specs, vacuum numbers, and streetability?
------------------
89 RS parts car
Daily driver 91 RS auto LO3 70k, 14x3 K&N Open element, cat-back delete, Richmond 3.42's, Zexel Torsion posi.
Coming soon: 350, headers, loudmouth exhaust, gutted cat.
------------------
89 RS parts car
Daily driver 91 RS auto LO3 70k, 14x3 K&N Open element, cat-back delete, Richmond 3.42's, Zexel Torsion posi.
Coming soon: 350, headers, loudmouth exhaust, gutted cat.
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