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Forum: Engines

08-17-2014, 01:58 PM

Replies: 16

lack of power

Views: 4,500

Posted By Fippe

Most of the time I cursing around in 7mph but...

Most of the time I cursing around in 7mph but sometimes I also cruising in 27-30mph but never faster than 32mph at this pion the engine revs about 3100-3500 rpm if I remember correctly this might be...

Forum: Engines

08-17-2014, 06:56 AM

Replies: 16

lack of power

Views: 4,500

Posted By Fippe

I also changed the diameter of the prop from 15...

I also changed the diameter of the prop from 15 to 14,75 four bladed, according to the propshop I could expect about 400rpms increase, maby they gave me the wrong info,

When I tested the boat...

Forum: Engines

08-16-2014, 03:26 PM

Replies: 16

lack of power

Views: 4,500

Posted By Fippe

I've tested a 14,75 diameter and a 15P 4 blade...

I've tested a 14,75 diameter and a 15P 4 blade and the rpm didn't change much.
The new prop has a smaller diameter and pitch but I couldn't get the rpm increase I thought a should, only about...

Forum: Engines

07-20-2014, 05:57 PM

Replies: 16

lack of power

Views: 4,500

Posted By Fippe

Thanks for the info, if he has a 5.0 engine ain't...

Thanks for the info, if he has a 5.0 engine ain't that engine delivered with a 1,62:1 gear ratio
and therefor needs a bigger prop?

This forum and it's members are great.

Found a chart that...

Forum: Engines

07-17-2014, 08:07 PM

Replies: 16

lack of power

Views: 4,500

Posted By Fippe

I've spent most of my day searching around in the...

I've spent most of my day searching around in the forum and net to learn about propeller diameter and pitch how it affects rpm and used several prop calculation programs and got me wondering if my...

Forum: Engines

07-17-2014, 12:58 PM

Replies: 16

lack of power

Views: 4,500

Posted By Fippe

Thanks I appreciate that. I'm eagerly waiting for...

Thanks I appreciate that. I'm eagerly waiting for the info to se if my engine is good or bad.

Forum: Engines

07-16-2014, 04:58 PM

Replies: 16

lack of power

Views: 4,500

Posted By Fippe

It's correct alpha one from 97. Why won't...

It's correct alpha one from 97.
Why won't higher hp increase rpm at WOT?
If I get more hp wouldn't that make it possible to rev higher when the extra power gives the boat a extra push in the water.

Forum: Engines

07-16-2014, 02:47 PM

Replies: 16

lack of power

Views: 4,500

Posted By Fippe

I think it is 1,47:1 Last time it was 2...

I think it is 1,47:1
Last time it was 2 persons and normal gear,
When the boat was put in the water the crane driver told me my boat was around 6250lbs and that's with around 60-100L fuel, no...

Forum: Engines

07-16-2014, 09:27 AM

Replies: 16

lack of power

Views: 4,500

Posted By Fippe

lack of power

Hello,

I have a mercruiser 5.7 2bbl mercarb thunderbolt 5 wo knocksensor in a maxum 2400scr from 97.
I have rebulit the engine after a blown headgasket,
when i bought the boat it only rew...

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