SO Yamato Rule Changes

[42R Dad]

I thought he ran and set the OSY 3/4 record with a 302 in Alexandria?

J. Michael did set the record with the 302. He has not run the 102 for 3 years.

He won OSY 2002 Nationals with a 302 beating some very fast 102's

The 302 has come a long way, and should continue to get faster.

I ran the 30H had to go buy a 102 then I bought the 302. The Mercury is collecting dust and so is the 102.

Jeff

[14-H]

*** I haven't spent anywhere near $10,000 as far as my wife knows..... ***
Scott

Scott: The last three new boats I bought, I paid $995.00, each. Ed.

[DougMc]

So OSY Nationals was won with a 302 in:

1. 2002 (Kelly)
2. 2004 (Allen)
3. 2005 (Allen)

There is no height limit for either model in OSY.

Should I be running a 302?

[drbyrne55]

102 ... 302 Parity?

1) it still is up to the driver in making his height setup, but is limited to 1/2"

2) the tucking issue exists only in the OMC 15 classes, since people were jacking and tucking to get the "bullet" out of the water, in short definition. People still "tuck" in other classes, as well.

3) shaving the gearcase basically has nothing to do with lowering the center of gravity (only a very few did that), but "streamlining" the shape of the case. You can "shave", but it still has to meet "specs" for the class. All of these "modifications" that are allowed, as brought about so that each owner of a Yamato would have the ability to make their motor the same as the next guys, due to manufacturing variances. BUT, alot of it has gone to far. What Ed has stated is that these "modifications" have put the motor FAR from "stock", which is what the class is supposed to be. Hell, I bet most of the "stock" guys have more money into their "stock motors" (i.e, blueprinting, etc) than some of the "mod guys" have into their engines and that is not the intent of the class. But, since all these motors are "production built", the engines will never be identical and YES, one motor will be faster than another.

maybe OCD has set in trying to figure this out....

Premise ... 102 ... 302 parity


1. It seems that over tucking a propeller can be more dangerous than raising a level prop shaft to hydro bottom ..."0"depth. If so, was the 1/2" rule created for some other than a safety reason?

2. Can any one objectively verify 302's ran at "0" depth started to outperform the 102's the year prior to the 1/2" rule.

[Cameraboy]

So OSY Nationals was won with a 302 in:

1. 2002 (Kelly)
2. 2004 (Allen)
3. 2005 (Allen)

There is no height limit for either model in OSY.

Should I be running a 302?

I asked that question. We've got one of each, they both spin over 7K, and we will keep working to go faster with both. I say leave things alone for now; I hear 102s are faster, but I see faster 302s all summer.

[csh2z]

I would suggest that the only proposal for next year in the Yamato classes be to allow an external water pick-up. I have 2 302's they both run very well. If a water pick-up is allowed it would open the door enough that I think the 302 can become the dominant choice. I'm going broke re-ringing motors to stay competitive. I also believe that when a new guy gets a new motor, he should be able to put it on any "C" boat at the maximum height set-up without cooking his motor. New drivers should not have to deal with this type of problem.
John Runne 2-Z

[Lights]

Proposal

I would suggest that the only proposal for next year in the Yamato classes be to allow an external water pick-up. I have 2 302's they both run very well. If a water pick-up is allowed it would open the door enough that I think the 302 can become the dominant choice. I'm going broke re-ringing motors to stay competitive. I also believe that when a new guy gets a new motor, he should be able to put it on any "C" boat at the maximum height set-up without cooking his motor. New drivers should not have to deal with this type of problem.
John Runne 2-Z

I second that proposal. Leave the rest alone

Mark

[dholt]

For drbyrne55

Here's the deal...hope this clears it up.

For the Y 102, 302 and 80 there are certain specs on the gearcase. Overall thickness, radius at leading edge, skeg shape, and more.

Everyone who wants to run fast would have their gearcase shaped to those tolerances.

But there was no spec on the overall height of the gearcase...from the bottom of the skeg to the top of case...where it bolts onto the towerhousing.

Some (it was believed) were shaving the TOP! of the case...thus reducing the overall height of the gearcase. So, when you bolt it onto the towerhousing, the prop shaft is now higher. HIGHER prop shaft means faster speeds. So, a 1/2" height rule for prop shaft in relation to bottom of boat was enacted to take away the advantage of shaving top of case.

[seanp3]

I asked that question. We've got one of each, they both spin over 7K, and we will keep working to go faster with both. I say leave things alone for now; I hear 102s are faster, but I see faster 302s all summer.

Mike - I'm with you. I'm happy with my 302, and my brother's 302 for that matter. One seems a bit faster than the other, and unfortunately Dan has the faster of the two. It just shows no two are the same. I don't really want to see a bunch of changes go in for next year. I ran mine at 1/2" all season and didn't experience any trouble. I ran it on 3 different boats and it didn't seem to make a difference - no overheating problems! Experience and better starts are going to be what is going to make me faster next season and my goal is to be competetive with anyone out there. And I don't feel I need to get a 102 to do it

[Cameraboy]

I would suggest that the only proposal for next year in the Yamato classes be to allow an external water pick-up. I have 2 302's they both run very well. If a water pick-up is allowed it would open the door enough that I think the 302 can become the dominant choice. I'm going broke re-ringing motors to stay competitive. I also believe that when a new guy gets a new motor, he should be able to put it on any "C" boat at the maximum height set-up without cooking his motor. New drivers should not have to deal with this type of problem.
John Runne 2-Z

Just to play devil's advocate, John - should new drivers have deal with figuring out how to add an external water pickup, in addition to shaping the gearcase, changing the shaft, and blueprinting the head on one of Montoya's in-the-box motors?

[Brian10s]

This is just a thought but since everybody seems to be in agreement that a change to all Yamato's is needed to provide durability and surviveability to the engines for years to come, as well as tighten up the parity between the 102 & 302. And the thoughts are for a change in the water delivery system as provided from the manufacture, why not just do it right and allow the Mod Yamato case that are run in C & B mod into Stock and to it right. The Mod case difference is a bullet shapped nose cone (epoxy or other) with low water pick up on a factory case. It would fix your pumping issues, as well as drastically improve the handling and tracking of the Yamato's.

My thought is, if you are going to make changes on this magitude (and changing the water delivery method in a stock class is big), then I think we ought to get the most out of it. And my reinvent the wheel when there is a proven method out there that already works, and works well.

Just a thought.

[bill boyes]

Are proposing to allow a nose cone with a water pickup for a 302 and a 102?

[csh2z]

A simple water pick-up mounted on the boat with a hose going to the back of the tower housing (water inlet) is all that is neccessary. Far cheaper than a gear foot job. As for the other questions, we all have contacts for people who currently do all these other modifications we just have to help the new guys out.
John 2-Z

[DougMc]

How about making the 202 legal in stock?

[DougMc]

This is just a thought but since everybody seems to be in agreement that a change to all Yamato's is needed to provide durability and surviveability to the engines for years to come, as well as tighten up the parity between the 102 & 302. And the thoughts are for a change in the water delivery system as provided from the manufacture, why not just do it right and allow the Mod Yamato case that are run in C & B mod into Stock and to it right. The Mod case difference is a bullet shapped nose cone (epoxy or other) with low water pick up on a factory case. It would fix your pumping issues, as well as drastically improve the handling and tracking of the Yamato's.

My thought is, if you are going to make changes on this magitude (and changing the water delivery method in a stock class is big), then I think we ought to get the most out of it. And my reinvent the wheel when there is a proven method out there that already works, and works well.

Just a thought.

I thought we were all in agreement now that the 302 has already become the dominate motor, expecially in OSY winning most of the recent nationals?

Why do we need a water tube if the 302 can dominate OSY on a national level in a class without a height restriction?