TNT triple yamaha pipe

[tntsuperjet]

Most the big twins I tested with PFP didn't break the 175hp mark.
Some where quite disappointing.
Several 900's don't have over 140hp.
Nothing with a B pipe broke 150hp mark.
As for the comment about twins not capable of 200hp.
My 1100cc twin snowmobile motor with turbo makes 336hp.
820cc arctic cat twin 218hp
860cc cat twin 231hp.
My dyno reads little low because I am at 3740ft elevation
830cc old cast dasa with alum sleeves nickel bore with new tnt pipe does 181.6hp at 7980.
That motor should rev 8150 so still working bugs out

 

[Quinc]

Now I know who to go to now for snowmobile work!

 

[Big Kahuna]

For those that do not know. There are a few people who when they post. It is best to listen to and pay attention to what they have to say. Tim is at.the top of that list. So is Chucky, Harry Klemm, Edbrig, Art, Randy (Watcon) and a few others that have been around for a while. Many do not post anymore or not on this site. I know Chucky stopped posting because members who honestly do not know squat were trying to tell him he did know what he is talking about. I know similar situations have happen with a few of the names mentioned. So. I Tim is telling you that several 1000's and 1200, s were disappointing in HP'S numbers. Listen to him. He has been doing this longer than many have been alive.

 

[waxhead]

As for the comment about twins not capable of 200hp.
My 1100cc twin snowmobile motor with turbo makes 336hp.
820cc arctic cat twin 218hp
860cc cat twin 231hp.
My dyno reads little low because I am at 3740ft elevation
830cc old cast dasa with alum sleeves nickel bore with new tnt pipe does 181.6hp at 7980.
That motor should rev 8150 so still working bugs out

Lets keep things in perspective here shall we. this is not a snowmobile forum and not many two stroke jetskis are running turbos that i know of

The comment was about the 62t based engines Tim.
Of course twins are capable of 200 just not the 118 bore centres we have with the 62t based platform.
There is not the volume in the transfers to support it and we cant get a proper shape into the transfer tunnels to allow the cylinders to get there.
this is why I said the laws of physics do not allow it.

 

[j0hnny]

mmmmmmm turbo 2 stroke blaster. that would be a death machine.

 

[tntsuperjet]

Thats a pretty bold statement..

Well I have sold three or 4 pipes to x members.
Pipe sales for yr 21
X member 4
53 water boxes
X members 0
Engines. 153 this yr
X members 0
Case trenching 46
X members 0
92 ported cyl
X members 0

I like the x it's great way to get interest going but not a lot of the members do business with us.
Also many of the members do not know that TNT was one of te first Yamaha performance shops in watercraft or what we do.
We stopped advertising in the watercraft market back in 1996 and out focus was in other sports. We have always kept some of our watercraft based customers and they sub let work to us.
Most of what TNT does is sold under different company names as

 

[tntsuperjet]

Wax, you are on the right path, it's not going to e easy to get a watercraft motor to the 200hp mark.
But in my personal attempts I am not going over 860cc for the very reason you mentioned. Why try to feed a 88mm bore with small transfer ports. Bigger the bore gets smaller the transfer tunnels get.
I also believe the exhaust port shape is very wrong on most the billet cyl. I have had 18hp gains on a 900 I welded up the exhaust changed the shape.
I am going to do some work on a tpe cyl with 84.5 mm bore and 8mm stroker and i will post the results.
I will also post a actual dyno run graph as well. I do this because it's my stuff and if it gets negative feed back it's not bashing on anyone else trying to do this sport good.
My approach maybe different then others. I want more efficient eng not the biggest eng on the market.
I will not build a 62t based motor bigger then 880cc regardless of the customers request. Will turn that work away for many other who do build solid 900+ CC engines.
There are some very good engine builders still playing with watercraft engines but like most of us we are limited in what we can produce if we want to turn even the smallest of profits.
But watercraft biggest nemisis is pipe design and exhaust design. No other two stroke uses the exhaust manifold designs that watercraft engines do, am watercraft make the lowest hp to CC of most 2stroke race engines.
Why??
Example. Moto GP was in the 200 HP range in late 80's with 500cc
That technology is quite easy to obtain today with most the great two stroke GP guys floating around no longer working for top secret factory teams.
Why is it not finding it's way into watercraft in past 20yrs ??
Master blast. Thank you for comments.

For those who don't know me, I am an engine guy that got tired of building disappointing numbers in my watercraft engines so I decided to make my own pipe to give me an edge over competition. But I learned over the yrs it doesn't matter how much faster your boat is then your competitors you can't win of you can't stay on it.
In 94 jammer rode one of my engines at world finals and after a yr of bad luck he finished back on top with a boat that was 5mph slower then I floundered on all yr on tour. His boat was carb orated mine where EFI.

 

[j0hnny]

like i learned years ago in cars. make all the power you want. without chassis and suspension its a waste. aweome set of posts.

 

[waxhead]

We are in total aggreense ? is that a word. I have long said that big bores are a waste of time on the 62t platform due to it reducing the transfers which are already a weak area in this platform. Stroker is a much better option, when you clock up the angles that the stock yamaha and alot of aftermarket cylinders aim there transfers you can see for some reason they seem intent on blowing the fresh charge straight out the exhaust. it leans the rising coloum of air right at the exhaust port. It astounds me that some people dont take this into consideration when they design a new cylinder.
as far as the exhaust port yes I agree with you there. the tpe with the triple is a much better design and it helps blow down time so much.
I have ported alot of motor bike engines and other cvt based engines much as your self and it astounds me the cylinders we have in the pwc.

I am keen to see what you do with the triple yamaha engine pipe. I posted a link before that shows you the ski I have built as well as the engine mods, re the porting etc. have a look if you have time I go over the directions of flow. Im sure i not showing you anything but just my findings

 

[waxhead]

like i learned years ago in cars. make all the power you want. without chassis and suspension its a waste. aweome set of posts.

But leaving black lines from the exit of one corner to the entry of the next is great fun

 

[Quinc]

If snowmobilers are taking the Polaris 1050 and 1200 cc watercraft cases and then using snowmobile cranks assembled into a triple crank and snowmobile cylinders. Why can't we do the same and put them into a jetski?

Edit: Most guys are saying these are good for 200hp + at 8-9k rpms

Might even fit in a blaster or sxr?

 

[scottie mac]

I have dyno tested few of the big 1000 and 1200 motors and been quite disappointed in there performance.
Most of them don't out perform the older 785cc race motors.

Been saying that for years........

SM

 

[tntsuperjet]

Quince that's been done. The old factory Polaris triples where the snowmobile cyl with triple pipes.
Problem is in a sled your clutching let's motor free spin to 3800-4800rpm without load.
Watercraft direct drive.
Back in the day one of the sled companies out a clutch in the sit down but no one could ride the boat.
In watercraft you have to have decent power by 4000rpm or it will be really lazy, getting a pipe to work good at that low of rpm is difficult and still make rev.
8250-8500 rpm is where all my higher hp sleds run. But they are 12 to 21 hp less at 4200 then good watercraft motor.
Direct drive is a problem for tuning

 

[Quinc]

Could fill the outside of a barn with what I don't know. Thank you for the clarification.

 

[waxhead]

Been saying that for years........

SM

Dont you know race engines have no bottom end power Scottie

 

[scottie mac]

^^^NONE. All top end.

SM

 

[tntsuperjet]

Ok so looks like I may need to change my voice in concern to customers from the X
I have received 8 emails about the triple Yamaha pipe in just a few hrs.

 

[j0hnny]

some of us are just looking for the right info and parts plus ur not competing against "well everyone runs a limited FP and they are awesome" in the triple world lol

 

[waxhead]

All the cool kids run the yamaha platform. I hope you got my email

 

[tntsuperjet]

Wax, I did.
I will also being doing all of Rob Flores yamahas for next yr.