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Thread: 300R vs 300X

  1. #1
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    300R vs 300X

    Does the new V8 make as much hp as the old 2-stroke? Just curious if anyone has dynoed both on the same dyno or ran both on the same boat for direct comparison as comments like the one below saying the R makes more than the published 316hp and the X made 326hp according to DBR, not sure if numbers are corrected the same or not. The X ran 104mph on 20’ Bullet and the R 103mph on a 21’ Bullet, so it seems maybe it is pushing the 10% limit like the X was.

    http://www.bbcboards.net/showthread.php?t=972249
    http://www.davebushracing.com/mercur...0x-update.html
    http://bassboatexchange.com/bullet-b...ph-20xd-bullet

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    I have known from the 1st tests of the new motors that they were very underrated to insure beating the XS 300's. If they didn't, no one would buy them.....I would guess they push 330hp...

    83 V-King, 96 Mariner, 200 hp ff block 2.5 w/a 28p choppa
    We gotta clean this liberal mess up, VOTE TRUMP TO MAGA!
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    Maybe he will see this and pipe up but Wildman has run both the X and the XS against each other on a few different hulls and he said there was at best a couple mph difference during those test sessions if I recall. He is now all over the R motors comparing those as well.

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    Quote Originally Posted by XstreamVking View Post
    I have known from the 1st tests of the new motors that they were very underrated to insure beating the XS 300's. If they didn't, no one would buy them.....I would guess they push 330hp...
    I have no doubt the R makes more than the XS, based on results below even though they’re not same day as when the R went 103. I’m just curious if the ranking below of the 300hp Mercs would be correct?
    300 SeaPro<300 PRO XS<300XS<300R<300X

    http://bassboatexchange.com/300xs-op...ne-test-review
    Last edited by PRE-Z06; 04-03-2019 at 09:10 PM.

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    I have several X motors and can tell you the R makes more power, more torque, has better manners in every aspect, and is way better on fuel, but they are expensive. Randy has run 5 or 6 mph faster then he went with any previous motors X, XS, and 400R on his 21 liberators. Steve has run 110 with his Bullet bass boat. They are the best answer out there today and I was never a 4 stroke fan when the inline 6 was our only option.

    Joe

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  8. #6
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    Quote Originally Posted by JPEROG View Post
    I have several X motors and can tell you the R makes more power, more torque, has better manners in every aspect, and is way better on fuel, but they are expensive. Randy has run 5 or 6 mph faster then he went with any previous motors X, XS, and 400R on his 21 liberators. Steve has run 110 with his Bullet bass boat. They are the best answer out there today and I was never a 4 stroke fan when the inline 6 was our only option.

    Joe
    Thanks Joe, I have no doubt the 4.6L V8 makes more low end torque even with the R’s shorter intake runners and cams that shift the power curve up. I never liked the supercharged 6s because of weight and heat from compressing the air, but to hear the 300R outperformed the 400R has me questioning the quality of fuel used. Both on 87 octane I could possibly believe enough timing was pulled to even things out as CARB reports show it making 390hp@7000rpm, granted the 300R is ~150lbs lighter than 400R. Looks like same prop only saw a 1-2mph gain from 300XS with 300R, the 5-blade CNC cleaver gave it an extra 3-4mph. Is that the same prop on the Bullet with 300R that went 103?

    http://www.mercuryracing.com/liberated-300r/
    Last edited by PRE-Z06; 04-03-2019 at 10:19 PM.

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    Mercury states the 300R went 97mph with it’s non CNC 5-blade below, which means similar gains as with the CNC prop on the Liberator. The 21’ Bullet with 300XS did 96 in the test above which is similar to the 1-2mph difference mentioned in the Liberator comparison with the same prop. How many hp is needed at triple digits to pick up a mph?
    http://www.mercuryracing.com/boat-pr...board/max5-st/

    Doesn’t look like taller gear ratios are coming with the release of taller pitch props...
    http://www.mercuryracing.com/boat-pr...rd/bravo-i-fs/
    Last edited by PRE-Z06; 04-04-2019 at 12:12 PM.

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    I always wondered if Wildman has ever run an X, an XS, and an R on the exact same hull over the years and kept the data.

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    I know Randy ran an XS and an R motor on the same 21 Liberator for a comparison. Remember the R was faster, but Im sure he will be along shortly to share the particulars.

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    Quote Originally Posted by Beak Boater View Post
    I know Randy ran an XS and an R motor on the same 21 Liberator for a comparison. Remember the R was faster, but Im sure he will be along shortly to share the particulars.
    I have no doubt the R is faster than the XS, the X was faster than the XS too correct?

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    8cyl Vs 6cyl...

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    Quote Originally Posted by LMT383 View Post
    8cyl Vs 6cyl...
    4-stroke vs 2-stroke...which ~50% more displacement is usually needed to equal the power output being combustion happens half as often, hence 3.0/3.2 vs 4.6

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    Only advantage to a 4s is the ease of huffing them.

    83 V-King, 96 Mariner, 200 hp ff block 2.5 w/a 28p choppa
    We gotta clean this liberal mess up, VOTE TRUMP TO MAGA!
    Rebuild thread:
    http://www.screamandfly.com/showthre...-it&highlight=
    http://www.screamandfly.com/showthre...cs.&highlight=
    Videos

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    They will never run that much better then an X or an XS without having them propped correctly and the engine height being up to get the bigger case to surface. These new gear cases are .600 bigger in dia. so you need to go at least that much bigger in prop dia. to compensate then they also take advantage of being able to turn a 5 blade for hook up and efficiency on top of that.

    There is no sense in commenting about them unless you have experienced it. Both Randy and I were anti four stroke and never had an appreciation for a 400R in a single application. -I didn't think they were ever going to come out with anything better then an X again "I was wrong".

    These motors are also set up in a totally "de-tuned" form so that they can run on swamp fuel-There should be very little warranty claims in this form. Give it a little time and see what happens when someone puts some compression, cams, and head work into the picture. It will be the ultimate outboard under 550 lbs. and will make the best river rat motor ever.

    Joe

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  19. #15
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    Sounds awesome, can't wait... Just wish mine would show up... Praying like crazy up here in the north...

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