Pirata, need better fuel economy

[Sdc77]

Tune it ! Pirata/Saltare with 454 are efficient boats.
Mine went from 8 gallons/hour to ... 4.75 gallons/hour ! With the factory 13x13 propeller. I will change it next season to see if I get even better milleage.
With a good carburetor rebuild : pay big attention to the secondary lock arm, tends to bend and let air/fuel passing through even when primary is closed (my issue for 2 years, fixed last season).
Add a new $50 car HEI ignition (plus a few upgrade to marinize it, follow Michael post : https://forum.supraboats.com/showthr...ferrerid=14935 ), new plug wires, new sparkplugs. Go to 12° BTDC (instead of 8° in the repair manuel) will save tons of fuel.
Good luck

[lively]

Tune it ! Pirata/Saltare with 454 are efficient boats.
Mine went from 8 gallons/hour to ... 4.75 gallons/hour ! With the factory 13x13 propeller. I will change it next season to see if I get even better milleage.
With a good carburetor rebuild : pay big attention to the secondary lock arm, tends to bend and let air/fuel passing through even when primary is closed (my issue for 2 years, fixed last season).
Add a new $50 car HEI ignition (plus a few upgrade to marinize it, follow Michael post : https://forum.supraboats.com/showthr...ferrerid=14935 ), new plug wires, new sparkplugs. Go to 12° BTDC (instead of 8° in the repair manuel) will save tons of fuel.
Good luck

I'm interested in the hei , I bought one like 2 years ago and tried to fit it up but the thermostat housing was in the way , I had MS mill a aluminum spacer and it worked ok , but may try the msd setup on the new build . Any clearance issues on yours ?


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[Sdc77]

Hi Lively,
No celarance issues on a 454, the thermostat housing is on opposite side of the engine.
Chears