Page 2 of 6 FirstFirst 123456 LastLast
Results 11 to 20 of 53

Thread: Performance Improvements possible with newer 4 stroke outboards

  1. #11
    Team Member
    Join Date
    Sep 2008
    Location
    Singapore/Melbourne/Italy
    Posts
    1,142
    Post Thanks / Like

    Default

    I heard Merc tried to mod that 4s60hp lump on the European F4, it kept blowing up so it went back to stock?
    Goes into gardian mode just getting off the dock and maybe down the straight, dont know if they fixed that?

  2. #12
    Team Member
    Join Date
    Sep 2008
    Location
    Singapore/Melbourne/Italy
    Posts
    1,142
    Post Thanks / Like

    Default

    Quote Originally Posted by Hounddog View Post
    Up here the new generation of racers are not interested it the old school 2 stroke motors. They would like to use their lap top and reprogram their motor same as they do with their cars. They don't mine throwing lots on money into their modifications. There is a very good supply of rebuildable 4 stroke outboards on the market for them to work with. The problem is there is limited information on what can be done to improve the performance or any OEM or aftermarket parts. Maybe there is not enough market for companies to spend the R&D money necessary to develop the products. Years ago the same could be said about the small Honda cars.
    To-day that is a BIG business.
    We need find ways to get these new people racing. Are you seeing the same thing in your area?
    Any suggestions?
    If they want to spend money get them to make EFI kits for old 2 strokes
    create a new EFI controller for etec injectors now ya talking
    Likes Ron Hill liked this post

  3. #13
    Team Member
    Join Date
    Aug 2014
    Location
    Naples Florida
    Posts
    84
    Post Thanks / Like

    Default

    I'm sure someone knows how to work those heads. It would be a fun project to play with.
    Likes Ron Hill liked this post

  4. #14
    Administrator Ron Hill's Avatar
    Join Date
    Nov 2004
    Location
    Tustin, California
    Posts
    8,337
    Post Thanks / Like

    Default Schneider Race Cams in San Diego Knows Cams

    Quote Originally Posted by Tiller guy View Post
    I'm sure someone knows how to work those heads. It would be a fun project to play with.
    I think his name is Jerry. Been grinding cams since the Kenny Harmon days. Kenny welded cam's lobs on 250 Honda Motorcycles and then re ground them. Lit those 250's up. Jerry regrinds the cams and sells valve springs. We gained 10% with this cam on a 40 HP.
    Flashing the computer helps ZERO UNLESS THE VALVE SPRING ALLOW HIGH RPM'S.
    Last edited by Ron Hill; 05-21-2019 at 07:46 PM.

  5. #15
    Team Member
    Join Date
    Sep 2008
    Location
    Singapore/Melbourne/Italy
    Posts
    1,142
    Post Thanks / Like

    Default

    Quote Originally Posted by Ron Hill View Post
    I think his name is Jerry. Been grinding cams since the Kenny Harmon days. Kenny welded cam's lobs on 250 Honda Motorcycles and then re ground them. Lit those 250's up. Jerry regrinds the cams and sells valve springs. We gained 10% with this cam on a 40 HP.
    Flasing the computer helps ZERO UNLESS THE VALVE SPRING ALLOW HIGH RPM'S.
    but you had gears....

  6. #16
    Team Member
    Join Date
    Sep 2008
    Location
    Singapore/Melbourne/Italy
    Posts
    1,142
    Post Thanks / Like

    Default

    Quote Originally Posted by Tiller guy View Post
    I'm sure someone knows how to work those heads. It would be a fun project to play with.
    I think the issue might be most of the engines are highly optimized to do the job they were designed for hence as light as possible.
    Its not a LS3 where GM knows they will be getting a hard time.
    IMHO you might find there are many weak links in the chain if you make more power and revs and those parts are going to cost way more than the old 2 stroke when it goes bang.

  7. #17
    Administrator Ron Hill's Avatar
    Join Date
    Nov 2004
    Location
    Tustin, California
    Posts
    8,337
    Post Thanks / Like

    Default Ron Hill is A Two Stroke Man, and Always Has Been and Always Will Be!

    The problem with 2 strokes, right now, there are no new one in America. And they haven't made any for 15 years or so.

    The people I deal with race hard in drag racing with their two strokes, but they do blow engines up and parts are getting harder to find.

    Guy buy new four strokes, put them on a boat that went 50 MPH and the new Four Strokes go 42 MPH. With the help of the Signature Propellers we have been making, we have the speed up 12 MPH.

    Looking the heads over, figuring compression ratios, porting the heads, grinding the cams, changing the valve springs, we will gain power!

    For how long? That is the question!

    Prop looks somewhat like this, but this is not the "HOT PROP" for 50 HP 4 strokes.
    Attached Images Attached Images  

  8. #18
    Team Member
    Join Date
    Mar 2018
    Posts
    14
    Post Thanks / Like

    Default

    Quote Originally Posted by Ron Hill View Post
    The problem with 2 strokes, right now, there are no new one in America. And they haven't made any for 15 years or so.

    The people I deal with race hard in drag racing with their two strokes, but they do blow engines up and parts are getting harder to find.

    Guy buy new four strokes, put them on a boat that went 50 MPH and the new Four Strokes go 42 MPH. With the help of the Signature Propellers we have been making, we have the speed up 12 MPH.

    Looking the heads over, figuring compression ratios, porting the heads, grinding the cams, changing the valve springs, we will gain power!

    For how long? That is the question!

    Prop looks somewhat like this, but this is not the "HOT PROP" for 50 HP 4 strokes.


    Hi ron, Are the semi cleavers performing best on the merc 4 strokes? If Evinrude would release a mid hp with a short shaft and a good lower unit that would be great, but dosent look like that will happen, we can only hope mercury makes some smaller lighter more powerfull 4 strokes, the 300r seems to be pretty awesome, just put some of that tech into the smaller engines and there may be some hope.

  9. #19
    Administrator Ron Hill's Avatar
    Join Date
    Nov 2004
    Location
    Tustin, California
    Posts
    8,337
    Post Thanks / Like

    Default "IF EVINRUDE" Since 1966 I've Been Saying That...

    Go with a winner and Mercury and Yamaha are the winners....well Tohatsu has some "hot" 40-50 HP four strokes with that 2.23 gear ratio...But with Evinrude, let's just say "If Evinrude"....

    Look on Facebook for Kent Foreman, Foreman Marine. He seems to win all the races.

  10. #20
    Team Member
    Join Date
    Sep 2008
    Location
    Singapore/Melbourne/Italy
    Posts
    1,142
    Post Thanks / Like

    Default

    How about the sound, a modded v8 merc will sound good, but the rest, yuk!
    Look what happened in FIA F1 when they dropped the v8
    Nascar with a v6?

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. 4 stroke gearcase on a 2 stroke outboard
    By omcstratos in forum Technical Discussion
    Replies: 0
    Last Post: 04-13-2016, 04:31 PM
  2. Want To Buy a newer model Yamaha 50 4-stroke lower unit
    By Mod40yammy in forum Lower Units and Outdrives
    Replies: 0
    Last Post: 07-21-2014, 08:57 AM
  3. The Harrison Racing Outboards - Legendary Birmingham Metal Products Alky Outboards
    By John (Taylor) Gabrowski in forum Outboard Racing History
    Replies: 169
    Last Post: 11-12-2008, 11:34 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •