single or twin engine...? ----- Original Message ----- From: Marc Rovner<mailto:[email protected]> To: [email protected]<mailto:[email protected]> Sent: Friday, September 11, 2009 1:00 AM Subject: [UnifliteWorld] Re: Prop pitch, GPH, cruising speed, RPM
I get 24 mph on gps running at 3400 - 3500 rpm with my 318. thats with 3 or 4 people and lots of stuff. prop is 16x15 not cupped. something is wrong with your numbers. i will be playing with my timing and plus tomorrow and hope to get a steady 25mph at 3600, with engine purring On 2009-09-10, at 11:01 PM, dodgetkboy78 wrote: > > I have recently bought a 1970 hardtop express. It is registered as a > 28', 9'8" beam boat, from what I can tell, it is a 27'3" boat. > > But thats not the question. > > It came with a 225hp 318, and recently has had an update to a 360. The > transmission, prop, ect, was all left alone. > > Top speed, if you got the guts to rev it that high, is around 24kts, > at 5100rpm. Yeah, ouch. > To stay on step, it takes 3300rpm, at about 13kts. > I have been cruising at 7-8kts, at 1800-2000rpm. Throttle is barley > open, and it burns around 4GPH at this speed. > > Here is my question. > > Does that sound right? It takes the 4bbls open a bit to keep it at > 13kts. I just cant bring myself to run it that hard, for long periods > of time. > Could I pitch the prop to make it cruise better at 12-13kts? Or would > it just take more throttle at less RPM? > > Either way, the 360 almost seems to big/too little. > > I can be happy with it at 7-8kts, but was wondering if it was, well, > normal. > > Other than that, this is the nicest handling, roomy, well built, > smooth riding boat I coould ever imagine, takes 4' following chop like > a champ, turns on a dime, and has a real "Heavy" safe feeling in the > water. My plans are to put a 330hp cummins in it eventually, that > should push it 15kts, and burn the same as the 360 at 8 I bet, but for > right now, I want to get the most out of my 360. > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "UnifliteWorld" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/unifliteworld?hl=en -~----------~----~----~----~------~----~------~--~---
