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  1. #1
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    Reed change lose power?

    Has anyone ever heard of a Mercury V6 losing high-end horsepower by switching to after market reeds? I "upgraded" to carbon fiber reeds awhile ago, and while the engine seems to run better at displacement speeds and seems to have better low-end throttle response, I've lost 2 mph and maybe 300 rpm at WOT. I don't know what else could have caused this. I'm going to check compression tomorrow.

  2. #2
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    A reed change can cause a drop in power if the new reeds are too stiff.
    Erik Kiser

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  4. #3
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    We were doing some extensive Dyno testing in May and June. And when it came to the Reeds we noticed 11HP variance between different thickness and stiffness of Reed materials.

    Quote Originally Posted by patchesII View Post
    A reed change can cause a drop in power if the new reeds are too stiff.
    Bud Conner "Heathen" "Defending Our Constitution"

    FOR ALL ENGINE APPLICATIONS
    DRY Film Lubricant for Piston Skirts & Cranks + Thermal Barrier Ceramic Coatings for Piston Tops, Combustion Chambers, Valves etc !!



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  6. #4
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    Someone on here did a reed comparison years ago, it was very informative. Reeds are critical....

    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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  7. #5
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    Eric is correct too stiff a reed will limit ability of a stock engine to “draw” vapor into intake I use only TDR reeds and a .022” composite reed I do NOT use carbon fiber reed valves on any motor I build , race or recreational for that reason ...JMO

    Jay
    Jay @ JSRE


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  9. #6
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    I just reviewed the reed tests, very interesting.

    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:
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    http://www.screamandfly.com/showthre...cs.&highlight=
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  10. #7
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    Have a link to the reed tests?

  11. #8
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    Quote Originally Posted by Radiant View Post
    Have a link to the reed tests?
    https://www.screamandfly.com/search....archid=4961162

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    I gave up on the search and went google. Typed scream and fly reed tests. https://www.screamandfly.com/archive.../t-206831.html Near the end of the thread

    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

  13. #10
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    Quote Originally Posted by XstreamVking View Post
    I gave up on the search and went google. Typed scream and fly reed tests. https://www.screamandfly.com/archive.../t-206831.html Near the end of the thread
    That was VERY interesting. I wish I hadn't thrown away my stock steel reeds or I'd swap them and check numbers again.
    I have a 2.0L 150 XR2, so the reeds are horizontal. I hate to say it, but the reeds are CCMS reeds. It runs a little better at displacement speeds and "seems" to have better low end throttle response, but the boat is at least 2 mph slower and was turning up 6200-6300. Now I'm only getting 5900. I want my old reeds back!

  14. #11
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    Quote Originally Posted by croSSed View Post
    That was VERY interesting. I wish I hadn't thrown away my stock steel reeds or I'd swap them and check numbers again.
    I have a 2.0L 150 XR2, so the reeds are horizontal. I hate to say it, but the reeds are CCMS reeds. It runs a little better at displacement speeds and "seems" to have better low end throttle response, but the boat is at least 2 mph slower and was turning up 6200-6300. Now I'm only getting 5900. I want my old reeds back!
    2.0 150 XR2 is a vertical front motor...
    Josh Peterson

  15. #12
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    Quote Originally Posted by croSSed View Post
    Has anyone ever heard of a Mercury V6 losing high-end horsepower by switching to after market reeds? I "upgraded" to carbon fiber reeds awhile ago, and while the engine seems to run better at displacement speeds and seems to have better low-end throttle response, I've lost 2 mph and maybe 300 rpm at WOT. I don't know what else could have caused this. I'm going to check compression tomorrow.
    . Please don’t take this as I’m being a smart a$$. Just want to add my experiences. Unless you tested and changed reeds. ASAP. Like I. 30 min went right back I. To test. Lots of other variables could affect your performance. Weather waves etc.
    Nitrous is like a slut. u wanna hit it but you know there will be consequences.

  16. #13
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    Quote Originally Posted by nitro_rat View Post
    2.0 150 XR2 is a vertical front motor...
    You are correct. Sorry. Semantics problem. As to the other comment from bigblue454chevy, I get it. But, you're full of it. I've operated this motor on this boat with this set-up for at least 10 years. It doesn't run like it used to, BUT...I haven't taken a compression reading yet.

  17. #14
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    Give a call so we can figure this out,Chris,305-394-3354

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  19. #15
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    Was their a change in temp and humidity from the higher numbers. 90-100 temp can rob 500 rpm vs. 50-70. Some older carb motors even have cold hot stop levers so you don’t over run when it’s cool out.

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