Hey Guys!
Ok I dont know if it is a typo on the O.S. engines website but it is saying this for the OS.32

SPECIFICATIONS
Stock Number: OSMG1636
Displacement: 0.319 cu in (5.23 cc)
Bore: 0.769 in (20 mm)
Stroke: 0.689 in (18 mm)
Practical rpm: 2,500-21,000
Output: 1.1 hp @ 17,000 rpm
Weight: 4.92 oz (425 g)

and the dynamite engine says this:

2-stroke Marine
Displacement:32 cu in
Bore:19mm
Stroke:18.4mm
Total Weight:350g
RPM Range:28,000
HP:3.18 at 28,000 RPM
Cylinder Type:ABC
Carb Type:Rotary


I bought a used shockwave 36 a few months back and it had an OS engine in it... If thats the case arnt i seriously underpowered? anyone have some thoughts?

Shawn

OS tends to be pretty accurate about their HP estimates. Some other companies are ....

i replaced my dynamite .32 with an o s 32 in my tc31. the os makes more power for sure. i still run the stock prop.

Interesting... So Is the Dynamite website off on their HP ratings? Im Happy with the performance of my boat, just thought that was kinda weird numbers... not even close.

Shawn,

if you look at how piper_chuck ended his sentence that will give you the answer regarding Dynamite.

take care,

Dan.

My dynamite .32 claimed it had 1.19hp when I got it 1 1/2 yrs ago.

OK Thanks guys! ok here is another one. Why would a .32 os be underpowered compared to the .21 turbo... if someone wanted to get more out of their boat but not have to change much, would a downgrade to the .21 turbo os be worth it? Just throwin it out there.

to add a side note to my last post. The OS .21VZ-M Turbo puts out 2.5hp with 3.2cc of displacement, where as the OS .32 is 1.1hp at 5.4cc... what is the better engine for the power? is it HP over Displacement? or the other way around.

Shawn

I would run a .21 before I would run a.32. Even a .28 put out more power then the .32 ever makes.[8D]

MssHydro, Kudos on your Hydro build, Been reading that thread for awhile, you did an outstanding job.... ok so here is the question then, what would you guys put into a shockwave 36 to replace the engine if it happened to blow? And with that being said, if i were to race this at a club, i take it that its no longer classified as a stock non modified boat? Who builds .28? I guess what i am asking is what would be a fast engine to put into my shockwave that is below a 7.5? but makes the best bang for the money? I like the specs of the .21 turbo.

Cheers

Shawn

VZ-M 21 all the way.

I don't know why OS made the .32 that way, normally as you go bigger in engine it should be better, but sometimes bigger is not always better.

the VZ-m would be the better of the two, why is the 32 so low.........could be the number of ports, porting, timing, head volume etc.
I'm sure I forgot something.

CMB Valvola 21, NovaRossi 21 and the LS 21, MAC 21(the real MAC not the russian one) VZ-M, Modified TT Pro.
if you put a .28 I believe that you won't be running with the 21's but rather the 45's.

Dan.

If you look at most of the marine .32s you will see that they appear to be based on sport airplane engines. These engines are designed to be easy to run and reliable, not win races. Contrast this to the .21s and you'll see that they are designed more for racing. Also, there's no money in developing powerful .32 engines, the size doesn't work well in any recognized class. OTOH, there are lots of powerful .21 engines because it's a popular class.

Interesting, So if i am going to change engines, the os .21VZ-M Turbo is the way to go? Can this engine be turned into an outboard with the use of a lawless drive? or no?

Shawn

Shawn,
not saying the VZ-M is the only way to go.
I have given you a few names on my last post that are much stronger than the VZ-M but also a bit on the expensive side.

But in a way yes, if you were to buy the VZ-M it is also a good way to go.

Dan.

Thanks Dan and everyone for your input, its much appreciated i am still quite new to the boat scene. i have many questions and ideas, its great to be able to talk to people who have done this for years and can give you some pointers

all you guys who think the OS is better because its got more horsepower..

you need to keep your eyes on the RPM difference also

Nova Rossi makes a wicked .28 and STS makes a nasty marine .28 too.[8D]

not really sure to whom it was directed but regardless I'm not taking it personal.

if your comparing the two .32's that where mentioned at the beginning of the threads, than I tend to agree.
But if your talking about the VZ-M, the OS VZ-M 21 with Practical RPM Range: 3000-40,000 and
Power Output: 2.5 hp @ 33,000 RPM is by far superior than any of those two .32

Dan.

Anna,
your right they do,
but if Shawn wants to race it would be better for him to go with a 21.

Dan.

yeah

what im saying is.

you can have a 2 horsepower nitro engine and if the engine is only putting out 2K rpm.
Your not going to be seeing the performance out of your boat that you would if you had a 1.89HP engine
that spun 3,500 rpm.

and i was directing that towards the os .32 and the dynamite .32

Thats a big 10-4.

Dan.

I guess it can be a touchy subject as to what engine people prefer to use. I dont really have any brand, hence why i ask questions. This will be my first season racing this year.. so im not going to drop any amount of money on an engine until i know what i want to do in the end. I just might shoehorn a .21 into my new Miss Vegas.... We'll see.

From my experience, you will not be disappointed with a CMB, the OS is a good motor, but not in the same performance league as the CMB. I have no Novarossi, MAC or LS experience so I can not comment on them as engines.

Choice of engine must largely depend what you are going to do with this boat, all out racing will dictate an all out racing motor, which then needs the pipe and all the additional maintenance that goes with the territory to maintain reliability.

OS is a good compromise.

Glenn

Dan,If he races and has a.32? It wouldnt make a differance on running a.28. He would be in the same class as a.32. If could afford the Nova's.28 it wouldve been put in my vegas or my Oberto hydro. The Oberto would be my S**T and giggles hotrod hydro boat! Just to put on a show with it..

Anna,

I understand what your saying, the problem is that there are no .28 and .32 class meaning he won't be able to race in the 21 class and will have to race in the 45 class.

Thats what I was trying to say earlier, he will be out gunned in the 45 class.

Dan.