Laid Back Boaters

Droop & diverter

Good Job Timmy. Now get it back on the boat and the engine in so we can go burn some fuel!!!

Olds 455 manifold

That looks awesome I wish I was closer so I could get mine done before I put it on... I like that.

Ride plate reinforced and coated with a wrinkle finish.

Just a reminder to start thinking about winter projects. I can do valve covers, intakes, brackets, timing covers, bellhousings, etc.

My alternator and new pulleys. Hope it still works


Old Eastman Kodak film can

fleetimus wrote:My alternator and new pulleys. Hope it still works

Damn, that's a huge pulley on that alternator. Are you trying to slow the rpm's of the alternator way down?

It will now run the same rpm as engine. two 5" pulleys. Before, it had a 7" and 2.5". At 6000 rpm the alternator was turning 16,800 rpm!!!!!!!!!!

fleetimus wrote:It will now run the same rpm as engine. two 5" pulleys. Before, it had a 7" and 2.5". At 6000 rpm the alternator was turning 16,800 rpm!!!!!!!!!!

That has to be good on the alternator bearings.

fleetimus wrote:It will now run the same rpm as engine. two 5" pulleys. Before, it had a 7" and 2.5". At 6000 rpm the alternator was turning 16,800 rpm!!!!!!!!!!

You need the alternator to spin faster than the engine in order to perform properly. Here is a quote from Super Chevy magazine:

"Alternators must spin faster than the engine. The speed of the alternator is a function of the pulley ratio between the crankshaft and the alternator pulley. This ratio from the factory is usually 3:1, which means that the engine's crank pulley is three times the diameter of the alternator pulley. Stated another way, at 1,000-rpm engine speed, the factory alternator spins 3,000 times a minute. Alternator idle performance is proportional to the pulley ratio and the engine idle rpm. Because high output alternators have a very steep idle performance curve, it is critical that the alternator spin at a minimum of 2,400 rpm. If alternator rpm drops below 2,400, output capability will quickly decrease.While underdriving a vehicle's accessories can boost performance at higher engine RPM, it will sacrifice charging at idle. By keeping a small pulley on the alternator, 10 or more additional amps (at a given engine rpm) can be created. March Performance and others offer V-belt and serpentine drive pulleys that are as much as 15-percent smaller than original equipment. Using overdrive pulleys, as opposed to underdrive pulleys, will improve the charging system's performance, but keep in mind that it is recommended alternators operate below 18,000 rpm, so if your engine spends a lot of time past 6k, keep your pulley ratio lower than 3:1."

Thought you might be interested.

Good info man, on my 460 the crank pulley is 8" and my alt was 2". at 5k rpms the fan would ring, because it was spinning so fast! the 3" one I have now is much quieter,