The iboats forum moderators are excited to announce that at this time it appears the iboats forums posting pictures function is working once again. Though we cannot promise for how long, we're hoping for indefinitely.
I have a 13.75x21 now on a 89 maxum with a 5.7 and run 4200 RPM at wot but I do not have a very good hole shot and thought about going with more pich but 21 is a big pitch will it hurt to go more or stay with this prop???
you need LESS PITCH the motor if runnning correctly should run about 4800 rpm <br /><br />did the boat ever run at higher rpm or was 4200 allways max<br /><br /> http://www.iboats.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=36;t=000030 <br /><br />this is good prop info from the faq section<br /><br />tommays
this was the original prop on the boat when i got it bout original on the boat not sure? what pitch would you get to have a good hole shot i am not to worried about top end speed as much.
its really trial and error the boat should reach its nameplate WOT with its normal load to give the best performance<br /><br />i am asking how well the motor runs because if its in good shape and tuned well it should have no problem with 13.75 x 21 the next size down is a 14*19 and that seams small for a 5.7 motor<br /><br />how big is the boat<br /><br />tommays
sorry guys just getting back busy week the motor runs good it may need a tune up the plugs are a little bit black. The boat is 20' and with 4 people it just dont want to get up to plain it is used to ski and tube.
well you can try a 14*19 its the next size smaller and will give a better hole shot<br /><br />if you have not done a tune up in a long time i would try that first 5.7 is plenty of motor for a 20 foot boat i have a 1995 maxium 20 ft with a 3.0 and it will push the boat just fine i think it would jump out of the water with a 5.7<br /><br />tommays
