49.7 using 4.00" rods

**OUTBOARDER** · 05-11-2009

Going to go mod a piston for 49.7 ci triple to accept 4.00" rod

any thoughts out there?

Thanks
Anthony

**Phil McDaniel** · 05-12-2009

All you have to do is find the right piston/wrist pin hole size,,,wrist pin location,,, skirt porting,,,etc.
Which rod are you planning to use????

You know, several years ago OMC and all it's money and capability invested time in their motors to stay ahead of their competition. They had far more than the average lay outboard person. From their tech. and available parts today which will make the 49.7 an O.K. racer. You are still going to wind up with the same distance from the center of the rod to the top of piston as in all other piston/rods available. My thoughts are"If it ain't broke---don't fix it"
Hope this saves you a lot of time and money. Phil

**Bunker Hill** · 05-12-2009

What's the objective here, what are you trying to achieve?

**OUTBOARDER** · 05-13-2009

Originally Posted by Phil McDaniel

All you have to do is find the right piston/wrist pin hole size,,,wrist pin location,,, skirt porting,,,etc.
Which rod are you planning to use????

You know, several years ago OMC and all it's money and capability invested time in their motors to stay ahead of their competition. They had far more than the average lay outboard person. From their tech. and available parts today which will make the 49.7 an O.K. racer. You are still going to wind up with the same distance from the center of the rod to the top of piston as in all other piston/rods available. My thoughts are"If it ain't broke---don't fix it"
Hope this saves you a lot of time and money. Phil

want to use improved 56ci rods that are 4" center to center, like a number of others, please dont tell anyone it's a secret

thanks Phil

**David Mason** · 05-13-2009

It has been tried many, many times by many racers. You are wasting time and a customers money.

**F-12** · 05-13-2009

Good advise , David. There are many more things you can waste time and money on than this.

**OUTBOARDER** · 05-14-2009

Originally Posted by Bunker Hill

What's the objective here, what are you trying to achieve?

To put the rod to stroke ratio where it needs to be for relibility, saftey as well as performance. FEH is a great class since you have the freedom to do this. Design the engine from the ground up.
Had to make a 45ss from scratch from ground up for FEH and it performed well.

Any way I found a prospective piston available in 76-76.5-77-77.5-78mm
will take a look and see if it will work for my application.

The local outboard junk yard has 4.000" 56ci rods, less expensive , in better condition and more robust than the 3.688" rods that originally came from a
2cyl crossflow making about 10 or 15 hp hp per hole.

Would never use antique parts for a "new" engine not in FEH

Thanks,
Anthony McCulloch

**Bunker Hill** · 05-14-2009

Answers my curiosity, Thanks

Bunker

**David Mason** · 05-18-2009

You deliver a reliable product. If you are building for reliablilty why are going through all the trouble to make it for racing ? Is it going to be a front runner or field filler ? A simple stock powerhead put together with stock parts with no porting or special parts will run just fine and offer very little issues. Much cheaper than going through the work you have mentioned. Is this your motor or are you charging someone to build them one ? If so, can you name your customer ?

**OUTBOARDER** · 05-18-2009

Originally Posted by David Mason

You deliver a reliable product. If you are building for reliablilty why are going through all the trouble to make it for racing ? Is it going to be a front runner or field filler ? A simple stock powerhead put together with stock parts with no porting or special parts will run just fine and offer very little issues. Much cheaper than going through the work you have mentioned. Is this your motor or are you charging someone to build them one ? If so, can you name your customer ?

Already answered Dave, it is less expensive since locally we do not have FEH race ready powerheads lying around. have already discussed the cost effectivene$$ of burning down ten $tocker$ a in one $eason vs say a Runne 49.7 .............

Quote: Much cheaper than going through the work you have mentioned?????
A: I did not mention work???

Q: Is this your motor or are you charging someone to build them one ? If so, can you name your customer ?
A: talk to me at the races or call 757 338-2008

PS: Let me know how much for one of yours and what it will do