300R vs 300X

[powerabout]

any design changes to help the propshaft live?

How about 1 piece race version?

[WILDMAN]

Steve Bishop ran 111.4 with the 300R on his 20ft Bullet and 106 with his 21ft Bullet. Both with a 34 x 15.25 Merc CNC or a Hill Signature 5 blade cleaver. They run the same speeds. I have run 4 21 and 22 Liberators with the same prop and 300R. All ran 111-113 with just me in the boat. On all these boats, the 300R was 10-12 mph faster than the 300xs.

[PRE-Z06]

Steve Bishop ran 111.4 with the 300R on his 20ft Bullet and 106 with his 21ft Bullet. Both with a 34 x 15.25 Merc CNC or a Hill Signature 5 blade cleaver. They run the same speeds. I have run 4 21 and 22 Liberators with the same prop and 300R. All ran 111-113 with just me in the boat. On all these boats, the 300R was 10-12 mph faster than the 300xs.

I saw that posted the other day, impressive that the 20’ Bullet was 8 mph faster than the 21’ same motor and prop.

[tripower]

Would like to know what they run with a regular working man's prop that's $500-$700 or so. Rocks happen around here, and $2K, $3K, $5K props ain't gonna happen for me :-)

[WILDMAN]

His 20 was 5 mph faster

I saw that posted the other day, impressive that the 20’ Bullet was 8 mph faster than the 21’ same motor and prop.

[powerabout]

Steve Bishop ran 111.4 with the 300R on his 20ft Bullet and 106 with his 21ft Bullet. Both with a 34 x 15.25 Merc CNC or a Hill Signature 5 blade cleaver. They run the same speeds. I have run 4 21 and 22 Liberators with the same prop and 300R. All ran 111-113 with just me in the boat. On all these boats, the 300R was 10-12 mph faster than the 300xs.

with same ratio and prop 300R v 300xs?

[JPEROG]

This has all been done with the 1.75 gear so far. The 1.60 should pick up another couple mph if it stays consistent with what mercury has seen in their testing.

Joe

[PRE-Z06]

His 20 was 5 mph faster

I missed that, was referencing Mercs 103 originally. Still didn’t realize there was that much difference between the two, how much do you think the lightweight batteries are worth? I’m guessing the ~3mph difference than what they got at Lake X?

[PRE-Z06]

Would like to know what they run with a regular working man's prop that's $500-$700 or so. Rocks happen around here, and $2K, $3K, $5K props ain't gonna happen for me :-)

Maybe someone else can tell what prop the 92mph referenced here was done with...
https://youtu.be/mQvtdoDfsIQ

[WILDMAN]

We have never found a cheaper prop that will hook up on a 300R. They must be over 15" diameter. I ran a 36x14.5 Dewald four blade and it was on the limiter at 90 mph. That's over 30% slip! Steve and I have spent alot of time testing the new motors. All the best speeds were with 5 blade cleavers by Mercury, $5500 or the new Hill signature 5 blade, I sell them for $2150 to your door. They run the EXACT same speed. I believe Steve's 106 on his 21 was with the trolling motor removed, but he still had two powerpoles on which creates alot of wind drag. I have tested the Mercury Max5 on 3 of the 21 and 22 Liberators and they all ran 103. A "Bullet" cut Performer 34x15.5 ran 106 and is about $900. I think Steve ran a little over 100 with the Performer.

[PRE-Z06]

We have never found a cheaper prop that will hook up on a 300R. They must be over 15" diameter. I ran a 36x14.5 Dewald four blade and it was on the limiter at 90 mph. That's over 30% slip! Steve and I have spent alot of time testing the new motors. All the best speeds were with 5 blade cleavers by Mercury, $5500 or the new Hill signature 5 blade, I sell them for $2150 to your door. They run the EXACT same speed. I believe Steve's 106 on his 21 was with the trolling motor removed, but he still had two powerpoles on which creates alot of wind drag. I have tested the Mercury Max5 on 3 of the 21 and 22 Liberators and they all ran 103. A "Bullet" cut Performer 34x15.5 ran 106 and is about $900. I think Steve ran a little over 100 with the Performer.

Have you run one of the new high pitch Bravo FS by chance that is 15.25” and Mercury claims is for the 300R?
http://www.mercuryracing.com/boat-pr...rd/bravo-i-fs/

[WILDMAN]

Steve has. He has also had Mercury modify them to test. I think he said they were OK with a tournament load. I don't think he broke 100 though. I will show him this thread. Maybe he can add some info.

[XstreamVking]

300R vs 300X ....Only explanation for faster speeds running the 300R is mo hp. Merc is the originator of underrating their engines. Wanna sell a crap load of new engines? Make them stronger than the old ones and still display the same hp stickers as the old ones had. The new motors are great, and fast. but let's be real here. Speed is a factor of power.

[powerabout]

300R vs 300X ....Only explanation for faster speeds running the 300R is mo hp. Merc is the originator of underrating their engines. Wanna sell a crap load of new engines? Make them stronger than the old ones and still display the same hp stickers as the old ones had. The new motors are great, and fast. but let's be real here. Speed is a factor of power.

my 4.0 v8 omc is killing the 150hp bass boat class..lol

[PRE-Z06]

300R vs 300X ....Only explanation for faster speeds running the 300R is mo hp. Merc is the originator of underrating their engines. Wanna sell a crap load of new engines? Make them stronger than the old ones and still display the same hp stickers as the old ones had. The new motors are great, and fast. but let's be real here. Speed is a factor of power.

I hear what you’re saying and agree, I just thought the 300X was pushing the 10% rule and that’s why I referenced it as the benchmark. Props and batteries contribute to speed as well as power. If the 20XD did 104mph with a passenger, 3 full size batteries and a non CNC prop with the old X, then it did 111 without a passenger, lightweight batteries and CNC prop with the R, how much of that gain was from HP alone? You’re right the numbers on the cowling don’t mean much as the new 300hp SeaPro, Pro XS, and R vary by 20hp each according to CARB reports. Some people question the accuracy of those but in this day and age of emissions, a manufacturer is paying for the amount of pollution their engine creates and horsepower is related to that so I don’t think they’re going to be fudging the numbers.