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  1. Replies
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    2.4L stock block with any tuner and tighter head...

    2.4L stock block with any tuner and tighter head is 125-6 hp
    2.5L Mod is 160 hp big time on the fun meter
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    When I raced SST70, it was to be 2.4 stock block....

    When I raced SST70, it was to be 2.4 stock block. I filled the odd side reed block with epoxy so no air flow. Then just put a drop of epoxy in the carb inlet needle seat to not allow fuel to that...
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    I know if you run starboard bank, 1.3.5 the...

    I know if you run starboard bank, 1.3.5 the engine will not rev as high. We always figure it was piston face to pipe length.
    We always race 2,4,6. low bank, port side
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    1/2 v-6

    Port bank of cylinders and Port side of exhaust. Shortest piston to pipe length.
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    more phots

    2.4 and 2.5 the most fun you can have with just 3 pistons.
    Always use the port bank when running left handed. It makes more power.
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    phots i think

    See if this worked7711677117771187711977120
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    Photos?

    can some one tell me how to add photos? Or someone I can send them to, that could post them for me.
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    Sorry I don't have answer to either question.

    Sorry I don't have answer to either question.
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    That was for the OMC 56 ci. The Merc .5 V-6...

    That was for the OMC 56 ci. The Merc .5 V-6 required no crank changes or issues. That half a V makes a great running inline 3. Fun stuff
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    I don't do anything with the crank, Static...

    I don't do anything with the crank, Static balance the crank and flywheel together. I do balance the rods end for end. The engine has a harmonic problem at 4000 and 8000. If you try to run at...
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    Yes

    Yes
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    Yes, I build two to three each year of that type...

    Yes, I build two to three each year of that type engine. I have to build two in a couple weeks to go overseas.
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    We also built a Force 95 crossflow. In some Mod...

    We also built a Force 95 crossflow. In some Mod porting it was very strong down low but could not run the top speed for solid wins. Would not turn any rpms so needed 17 prop with 14:15 gears in #6...
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    The SST 70 class was a later evolution of Mod 50....

    The SST 70 class was a later evolution of Mod 50. But guys got fatter so the size went up. OMC Mod 50 was a looper, 650-700X Merc was cross flow. The V-6 was nice Looper the you could just leave one...
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    The SST 70 class was stock block with tighter...

    The SST 70 class was stock block with tighter head and any tuner.
    mine made about 126 hp. the 2.5 I built was with small reed block as I needed great hole shot and the rest was like a mod u...
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    1/2 v-6

    I built them and raced many very successfully. SST 70 class was 75 cubic inch and below. Used a 2.4 Bridgeport as it had better porting than any three cylinder. I still have two engines. 2.4 Stock...
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    Effective Compression Ratio is the same as...

    Effective Compression Ratio is the same as Trapped compression ratio. ECR or TCR. It is when the exhaust port closes. If you raise the E port you are compressing less, so you can make the head...
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    More to think about: Fuel and compression...

    More to think about:
    Fuel and compression ratios. I'm assuming most motorheads here are playing with these feature.

    If a Gas piston temp is a base, Alcohol piston temp are much cooler so for...
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    Buy three different brands of pistons for the...

    Buy three different brands of pistons for the same model engine.
    Measure and record the A,B, C and D dimension. You will find a difference.
    Some is due to the different alloys may have different...
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    Important points on fitting Pistons

    Piston Fitting 101 from WPT, Mike Wienandt


    Bore in mm 62.28 ,+.020
    Stroke mm 55.6
    Con Rod Length, mm 111.2

    Cylinder # 1 ...
  21. I used to work at Mercury Racing. That is where I...

    I used to work at Mercury Racing. That is where I learned the system. They used a 30min total on all 2.5 race engines. It was a hurry out the door issue yet verifying everything was going to right...
  22. When doing three cylinder engines like OMC 50 cu...

    When doing three cylinder engines like OMC 50 cu or SST60 type engine be carfull of the engine vibration at 4000 rpms. We avoid that rpm.
    run 3500 at 3/4 throttle
    1 minute idle
    3500 at WOT
    1...
  23. This is the dyno break used by WPT for Tohatsu...

    This is the dyno break used by WPT for Tohatsu Sport C two cylinder.
    Break in setup

    Main Jets # 220
    Spark Advance 1/8 back from stop
    Fuel 93
    Oil Ratio 16:01

    The...
  24. Breakin new pistons

    Jeff, here is what i have learned over the 45+ years doing this
    Start the engine, verify it is cooling correctly. Only idle as long as it take for general check over. Make sure spark timing is with...
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    With the water pickup so far back on the torpedo...

    With the water pickup so far back on the torpedo I find it hard to believe you have enough water pressure in positive trim position. Caution
    Use water pressure gauge. not less than 15 psi about...
  26. All very important points here. To convert a...

    All very important points here.
    To convert a modern carb to alcohol is a task. Flushing engine with gas as Rob mentioned is a must. Most fuel pumps won't work for this. That is why Pro engines...
  27. As a rule of thumb, the fuel volume is 2.1 times...

    As a rule of thumb, the fuel volume is 2.1 times more than gas. So with the same size carb, the main nozzle and main jet must be increased. A typical gas engine is about 6:1 effective compression...
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    No OD, Merc racing did not use letters when they...

    No OD, Merc racing did not use letters when they issued S/n that I know of. The Mercury Racing outboards were never followed very good in the EPC. You can only look up parts by model, it's not...
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    The 7 18 03 is the date the engine was made. ...

    The 7 18 03 is the date the engine was made. The S/n is 037625
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    I wish I knew how to make an attachment, I could...

    I wish I knew how to make an attachment, I could supply drawing or photo.
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    I never make the chamfer to the deck less then...

    I never make the chamfer to the deck less then 1.400. The real port is lower yet. I don't raise that at all. I leave stock and do all the work with the chamfer. Raising the root of the port kills...
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    Is that Bridge port or oval port? That's higher...

    Is that Bridge port or oval port? That's higher than any mod Bridge port I make and if it's an Oval port that's still high even in the middle of the port. Remember the higher you make the port, the...
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    If you can pull a good prop load at 7800 rpms, I...

    If you can pull a good prop load at 7800 rpms, I would agree don't shorten it. With the longer pipe it will, get on plane better and have more low end power with the long pipe. you may want to...
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    No problem Phil. Im going to guess here but I...

    No problem Phil. Im going to guess here but I think for best engine performance the tuner length to powerhead should be maintained. For a 20 " would usually be on a larger boat that would require...
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    Yep you got guys

    Yep you got guys
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    Are both head gaskets the same quality material. ...

    Are both head gaskets the same quality material. The really old black OMC ones were best but can't get them anymore. As far as the thickness, Check the squish clearance. Don't want less than...
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    Measure the length from powerhead gasket to the...

    Measure the length from powerhead gasket to the end of the tuner. Make it 1" longer than the SST 60 spec for a V bottom. It will have more bottom end yet rev high enough to make you go fast.
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    Yes, that sounds like good idea.

    Yes, that sounds like good idea.
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    The early 56 block was not sand cast. It was...

    The early 56 block was not sand cast. It was permanent mold. The surface was smooth and shaped very well. The proto type engine tested for SST 60 was made of this, but when the engine was...
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    When milling the head, if you make it very tight...

    When milling the head, if you make it very tight spec the head will flex and not hold head gasket seal. That is one reason why I weld the thermostat hole. To give the head strength there. Would...
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    The SST 45s we build today are 71-73 hp at the...

    The SST 45s we build today are 71-73 hp at the crank. Takes some careful details to make that happen. Always on the search for good parts.
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    The best block for mod engines is the early 56 ci...

    The best block for mod engines is the early 56 ci permanent mold block, not the foam block. Bridge port, not oval port . I think about 87-88 I have built with all of them . The transfer ports are...
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    Was reading one of the other posts, The engine...

    Was reading one of the other posts, The engine has a bad harmonic vibration that you must avoid to prevent damage of the engine. 4000-4300 it shakes so bad it screws up the fuel in the float bowl...
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    there are two main kinds of carbs, What I call 2...

    there are two main kinds of carbs, What I call 2 jet and 3 jet. The 3 jet is from SST 45 and also older 50 ci engines. I have never been able to make 56 ci engine run on the 3 jet carbs correctly.
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    I have built over 15 national championship...

    I have built over 15 national championship winning SST 60s. The last 8 years I have run been about 100 - 102 hp at the crank. We dyno with the exhaust housing and gearcase so we match correct...
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