User Tag List
Thanks: 0
Results 1 to 15 of 20
Thread: First impression of 300 V8
-
09-12-2019, 06:10 AM #1
First impression of 300 V8
So we decided to replace our 13 year old pontoon powered by a 150 Yamadog (which has been a great engine even if slow on a 24' pontoon) with a 25 footer with 300 V8. I never knew I could like a 4 stroke this much. It's really smooth and torquey. I would have loved to have waited for a 450 but the price tag leaves me chilly and would have to go to 27' to get the rating which makes the price even worse and the bigger boat won't go in our boathouse. Seems odd that all of the dealers around here seem to be rigging these with the Merc 3 blade Evolutions, but it doesn't have any tendency to fan in a sharp turn. It's got a 17 on it and turns about 6200 at 45 MPH or a little more, so assuming 1.85 gears it's slipping upper teens although I'm not feeling it. I'm thinkin' about trying a 19 on it but the dealer thinks I should leave it alone. Pluggin' that into the prop calculator it looks like it oughta' drop the RPM down to about 5600 if it doesn't increase the speed which I would guess it would slightly. I'm just not sure how these newer engines with all their smarts start adjusting themselves to more load but I don't like the idea of turning it past the factory recommended redline o 6000 frequently and I doubt we'll be pulling anything with it.
Membership upgrade options: http://www.screamandfly.com/payments.php
-
Glasstream15 liked this post
-
09-12-2019, 06:50 AM #2
So you bought a ECO motor, show some pictures,
Last week I'm stopped at a light and this pontoon boat looked like 28 ft, SLEEK looking sun roof then I see a 627 Seven Marine on the back
NEVER saw that before.
Of course the motor matched the boats color,GOLD.Last edited by CUDA; 09-12-2019 at 07:05 AM.
We have invented the world; WE see
-
09-12-2019, 06:56 AM #3
I got a buddy running a 2019 250 pro XS 4 stroke on his caymas, it was rigged with a 23 p prop. Why are the new mercs running such low pitches? Any thoughts?
97 xb2002 15" 300x w 1.62 sporty
( Haulin Bass) (108 mph so far
(Rip. Whiteally02) -dad
They call it the American dream, to bad you have to be asleep to believe it. - George Carlin
-
09-12-2019, 07:42 AM #4
I was entertaining the Seven marine notion on my toon. There is a 27 Playcraft that was built a couple years ago with a 627 on it and it only runs around 62. The same boat with a 400 on it runs about the same. That extra 400 lbs makes a big difference. The seven sure sounds nice.
2005 APR FORMULA 2 ROOKIE OF THE YEAR
-
09-12-2019, 07:52 AM #5
I haven't gone completely into over the hill mode YET. Still have the Talon with the twin 280's and the Eliminator with the twin 700's. My buddy Chris thinks I oughta' sell the 280's and put twin 300 V8's on the Talon, but I'm still really likin' the 2 strokes. When I win the lottery and buy a HUGE block of Brunswick stock we're gonna' go back to building 280's, 300 Drags and S3000's again.
Membership upgrade options: http://www.screamandfly.com/payments.php
-
powerabout, Frank Molé, David - WI, Capt.Insane-o, delawarerick, Da Bull, Glasstream15 liked this post
-
09-12-2019, 07:57 AM #6Screaming And Flying!
- Join Date
- Dec 2001
- Posts
- 9,502
- Thanks (Given)
- 23
- Thanks (Received)
- 271
- Likes (Given)
- 191
- Likes (Received)
- 1976
- Mentioned
- 0 Post(s)
- Tagged
- 0 Thread(s)
ya need to sell ya Merc....3.4 stuff..... just old no good gas eatin junk..... I don't want it maybe someone does.....
-
09-12-2019, 08:03 AM #7Membership upgrade options: http://www.screamandfly.com/payments.php
-
09-12-2019, 08:53 AM #8Screaming And Flying!
- Join Date
- Dec 2001
- Posts
- 9,502
- Thanks (Given)
- 23
- Thanks (Received)
- 271
- Likes (Given)
- 191
- Likes (Received)
- 1976
- Mentioned
- 0 Post(s)
- Tagged
- 0 Thread(s)
just looknnn for old no good t4 ....they were too lazy to put shifters on em'.........
-
09-12-2019, 09:45 AM #9Membership upgrade options: http://www.screamandfly.com/payments.php
-
09-12-2019, 08:17 PM #10
Only Mercury Racing 300R’s are available with 1.60 and 1.75 gear ratio, the Mainline Mercury 300 has 1.75 gears. Unfortunately that’s 21% slip with your numbers.
I do know heavy RIB’s with props that small benefit from Enertia ECO props. They’re only 3-blades, but they’re huge diameter, 16” I think. I put one on my friend’s deck boat in a 17P and it runs well.
Hope this helps.A problem is only a problem when viewed as a problem...
-
Glasstream15 liked this post
-
09-12-2019, 08:56 PM #11
The Mercury Marine website shows the two ratios available as 1.75 and 1.85. QUOTE FROM MERC WEBSITE:
I tried to call Mercury today from that website phone number but it's worthless. Sometimes it does fast busy and other times it just disconnects after ringing one time. The boat doesn't seem to ventilate the prop at all, even in a sharp turn but I'm afraid in going to a 19, which shows as less diameter than the 17 it may lose some bite. I couldn't find the diameters on Merc's website, so relying only on what the dealer said.Gearcase ratio - 1.75:1 or 1.85:1
Membership upgrade options: http://www.screamandfly.com/payments.php
-
09-12-2019, 09:59 PM #12
So you have the 300 Verado, not the basic 300 4 Stroke with the conventional mid section. The regular 300 only comes in the 1.75 ratio, the Verado has the optional 1.85 gears. They both use the 5.44” lower which usually likes a 15” or larger diameter prop so the Enertia @ 16” should be fine. You might want to try a 19P Revolution 4.
Mark
-
09-12-2019, 10:03 PM #13Membership upgrade options: http://www.screamandfly.com/payments.php
-
mjw930 liked this post
-
09-13-2019, 08:40 AM #14
-
09-15-2019, 05:07 PM #15
Not sure about the 300, but I know on the 450's, the ECM will pull percentage of power at WOT so to not hit the limiter. Basically, reduces HP rather than slamming the typical "rev limiter" we're used to on the 2 strokes. Only way to know for sure is either up the pitch or plug in the computer.
2006 Spectre 24' SCS
2020 Mercury 300 ProXS
2001 Allison XB2003
2006 Mercury 250XS
1988 22' Velocity (sold)
1995 Allison Grand Sport (sold)
1998 Mercury Stock 2.5-260 SS
1990 Velocity 30' - 502's (sold)
Go Daddy Go! Racing
-
HydroSkreamin liked this post
Similar Threads
-
First Impression Carbon-Core
By One Oldman in forum Fiberglass and Composites DiscussionReplies: 8Last Post: 12-04-2016, 12:40 PM -
Steve Bridges as Obama - Comedy Impression - (EXCELLENT!)
By Robby321 in forum The Scream And Fly LoungeReplies: 0Last Post: 07-21-2010, 07:01 PM -
Performance Pontoon ride today, my impression
By JW in forum General Boating DiscussionReplies: 21Last Post: 04-21-2009, 01:35 PM -
My best Impression of Michael Dixon.....
By Ospreyproduction in forum General Boating DiscussionReplies: 5Last Post: 12-09-2005, 01:54 PM -
Optimax 115...first impression...
By sosmerc in forum General Boating DiscussionReplies: 3Last Post: 09-21-2003, 10:13 AM