1930 Model AA Cant Get Her Over 25 MPH

[pat in Santa Cruz]

check timing for sure, as too retarded will rob top end power.. Its not an uncommon situation. Your leaky manifold will decrease power too. Check it when you get the new one and be sure both manifolds are flat and with the ports in a straight line. You might have to have them surfaced. Check that your brakes are not dragging. A compression check never hurts, and it will give you a starting indication of the internal condition.

Once you get it running right, you can make it stronger with high compression head, cam, better breathing.

Once you get it up and running strong, you can always get a Mitchell Overdrive for it. I know someone around here with a 31 AA flatbed that goes 70.

[Working Class Zero]

Originally Posted by pat in Santa Cruz

check timing for sure, as too retarded will rob top end power.. Its not an uncommon situation. Your leaky manifold will decrease power too. Check it when you get the new one and be sure both manifolds are flat and with the ports in a straight line. You might have to have them surfaced. Check that your brakes are not dragging. A compression check never hurts, and it will give you a starting indication of the internal condition.

Once you get it running right, you can make it stronger with high compression head, cam, better breathing.

Once you get it up and running strong, you can always get a Mitchell Overdrive for it. I know someone around here with a 31 AA flatbed that goes 70.

Ok now I'm getting some hope back. lol. This girl does have a '32 head on it, don't know if that is an improvement or not. Gonna look into the mitchell overdrive. Does it screw with the stock look at all? 70MPH? Whoally Crap.

[pat in Santa Cruz]

a 32 head makes little difference. It breathes a bit better, but only raises the compression from 4.2 to 4.4 or 4.5 ( can't remember right now), not much.. A Mitchell OD has another shift lever in the cab, which is the give away. Two shift levers in an AA cab is not as unusual looking as in a car. The undercarriage will look different. The OD unit replaces the intermediate shaft behind the transmission. They'll have to know which shaft you have, short or long.

before you start adding power accessories to the engine, you must determine if its basically sound. That is, strong crankshaft and bearings, good compression, good valves, good cooling system, good steering and brakes etc. Beefing up a worn truck will just cost you money and increase the stress on the truck. But if you want to learn more, join the AA Truck Club. Website here:
http://www.fmaatc.org/

[pat in Santa Cruz]

high ratio ring and pinions can be found. Ask around the AA club site.