Getting my 1st 300R V8 this week.

I believe he said these

http://www.mercuryracing.com/boat-pr...board-cleaver/

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My new addition the the 300R cowl

Quote:

Originally Posted by WILDMAN

I'll take a 300xs off a 21 Liberator and put the 300R on. It will be an exact comparison other than props.

Quote:

Originally Posted by WILDMAN

Yes it has the 1.75 gears, but it will work on the 21. Top end on the 21 with a 300xs was always 103-105 as of 3 years ago. Since then, it seems to be 100-101. Mercury says they did not change anything, but the weight, prop, setup, etc is exactly the same. I'm hoping the boat will pick up about 4 mph based on a couple other boats I know of running the V8's. The 300R is about 3K more than the 300xs. I hope it's worth it, but then again, we have no other choice! I will be running a variety of 32" and 34" props.

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Originally Posted by JPEROG

I won't be an exact comparison until we get exact gearing but I want to go out with you when it shows up. We will run a few of big boy wheels.

Joe

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Originally Posted by altamate

If the motor is 4-5 mph faster then the 300xs that would be an improvement, kind of expensive but a welcome improvement. If it was 7-8 mph faster that would be impressive. We all just have to wait and see.

Quote:

Originally Posted by WILDMAN

To compare the 300r and 300xs, you need 2" more pitch on the 300R due to the lower gear. I will test 32's and 34's on the new motor. I know 8-10 people with DBR mods, and not a single one even gained 1 mph. That's just what I've been told. I did have a pair of DBR modded 300xs motors and they ran the exact same speed as stock motors.

Quote:

Originally Posted by Greg G

I may have lost this back earlier in the thread but what is the lower unit diameter of the 300XS Sportmaster versus the 300R's Sporty? Also, is the skeg itself longer/deeper?

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Originally Posted by engineermike

4.8" vs 5.44"

Quote:

Originally Posted by WILDMAN

Joe and I are planning to do some prop testing this morning. 32 Spinnelli DR4, Mercury CNC 34 x 15.25, BBlades Blaster 34 x 14.5, and Drag 5 31 x 14.5

Quote:

Originally Posted by WILDMAN

OK, here's the results. This lake is only 1.25 miles long, so I re-ran the MAX5 for a baseline.

Mercury MAX5 102 at 6150 rpm
Mercury CNC 5 blade 34 x 15.25, 105.5 at 6300 rpm
Drag 5 30 x 14.5 90 on the limiter
Spinelli 32 x 14.5 DR4 88 slipping on the limiter

Joe and I will post videos later

A grab bag of data from Wildman's test series comparing the 300XS to the 300R. Not sure if there was other data later into this year.

I'll have data on a pair of 300R's in a couple weeks on a new 25 Liberator

Quote:

Originally Posted by WILDMAN

My new addition the the 300R cowl

cant wait to see a V8 stacker..lol

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I got four more 300R's and a 400R today!

4 x 4.6ltr and 1 x 2.6 ltr

Quote:

Originally Posted by WILDMAN

Looks like the 300R's are going to run good on all the 21 Liberators. This was the first time out on this boat and it was very windy. More speed to come!

This may have been mentioned or talked about before but I couldn’t find it. Do you run the camber skag on these single 300R/400R boats? Or have you felt it would help at all?

Yes, you must run a cambered skeg (Also known as a Torque tab)

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Yay!

https://www.boatingmag.com/new-gear-...y-racing-300r/

https://www.screamandfly.com/attachm...1&d=1560185391