Bertram33 User Forum

Anybody running 315 6bta with 2.08 relationship? One prop is gone so I decided to change both. Every "specialist" gives me different suggestions, from 23x27 (not enough in my mind) to 24x28 I was running 23x26 and was not getting out of the water at 2500 - 16knts. That is the most RPMs I w...

Hi, Just found this thread that would have been very useful as I had the same problem and a big part of it was what is described here, but not all. If you don't have the upper deck completely enclosed (as I didn't used to) I found that water comes from the upper deck through the sides dripping on th...

Thanks, That is what the calculator is telling me. I will need new props, adding 3 inches is too much for what I read too. I,m getting 4knots less than all of you. I'll speak with the service guy coming next week and check the engines first, then make a decision. Thanks to all, been extremely helpful.

Buzzk and Dougl, Thanks for all the data. I Dived down and found all prop data. I'm running 23x26 with 2.08 relationship. Based on the data you gave me and the fact that I'm not even close to your speeds is clear that I need new props or cups. I'll get the engines phototached next week that I'm doin...

Please delete this post.Appologies

Anybody running 2:1 ratio on 315hp 6bta? That's what I have and I'm very slow compared to the numbers I've seen here so I'm trying to figure out if I have the right props. Thanks

Hi IRGuy, I was told also that is what we should run in rpms, however was given cruising speeds that seem much faster to what I'm reaching. Do you know at what speed your cruise for a certain rpm? Thanks

Chris, I bought an 89 converted to diesel with twin Cummins (6BTA). Would like to know if I have the right props, can you give me details of what you put in yours? Thanks

Hi, I have rain water coming in in the bottom right corner of the front window. The window itself is all sealed. I don't know what else to do. Has anyone had a similar problem? Thanks