In the 1978 race, an AMC engine built by Navarro produced at 8500 rpm with ( 24.6 lbs ) of manifold pressure.
22.
I raised the prop rpm and manifold pressure for climbout, angled for a climbing right turn off the south flank of Mt.
23.
We are getting about 45 inches ( of manifold pressure or boost ) but I have no assurances that everyone is getting 45.
24.
Things like the fuel pump, which has been giving us some problems by losing pressure, and the pop-off valve ( controls manifold pressure ).
25.
The accelerator pump is either mechanically connected to the throttle, or it is operated by sensing the manifold pressure change when the throttle is opened.
26.
A new engine was introduced in 1937 : the six-cylinder C6S-4 model, rated at 400 hp at 3300 rpm and 70 in of manifold pressure.
27.
The supercharger provides near-instant manifold pressure ( eliminating turbo lag, which would otherwise result when the turbocharger is not up to its operating speed ).
28.
The higher manifold pressure in turn allows more air to enter the combustion cylinders, and thus additional fuel is required to balance the combustion reaction.
29.
The engine alteration will involve reducing the maximum manifold pressure, or boost, from the current 37 inches to 36 in an effort to contain horsepower.
30.
One problem for just about everyone in the qualifying session was the popoff valves used to limit manifold pressure to the turbochargers on the Indy cars.
