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VMI75

08-12-2018 11:54 AM

1987 WellCraft Portofino

Need help determining most efficient fuel speed RPM for this boat with planning hull and gross weight is 10 tons

Powered by 2 Mercrusier 454 , with Borg Warner velvet drives.

Quinlan

08-13-2018 07:27 AM

We have an 87- Planing Speed!! Now that is Funny
I usually run about 2000RPMs- I will push to 3500 sum times But she is a Big Beeeeach

First pic is On Plane :cool:https://cimg5.ibsrv.net/gimg/www.off...fafdedd6fb.jpg
https://cimg0.ibsrv.net/gimg/www.off...cedd42a70d.jpg

Rookie

08-13-2018 08:26 PM

Quote:

Originally Posted by VMI75 (Post 4643205)

most efficient fuel speed RPM for this boat
454's

454's, there isn't one. lol Have a friend with gas engines.
I just sea trialed one with 425HP 3208 cat diesels. Cruise 25 mph at 1mpg topped out around 30 mph. (owners log shows 1mpg average) This will probably me my first diesel purchase. These boats are the size of an early 80's mobile home.

Griff

08-14-2018 12:14 AM

No way it will even get plane. It will just push the water out of the way.

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