NitroHammer .18

[t3NHRacer]

I might put a hyperformance .18 in my Nitrohammer. I am worried about stability. :o What could I do to help the stability at full speed if I got this engine? Big tabs turn fins? Any suggestions?

Here is the engine http://hyperprod.bizhosting.com/pull_start_15_inboard.html

[ejp]

Save your self 25.00. The o.s. .18cvrx I think it is puts out the same amount of power. It is aircooled but a kid on another forum put one in his NH and it runs great. WAY FASTER THEN STOCK he says. A way to get more stability? Surface drive??

[t3NHRacer]

This one puts out more rpm and the same hp. Are you talking about the rc universe post "JUst a Thought"? That kid did look like he had some luck with a air cooled motor but I would like to stick with water cooled. I have no money problem at the moment and I think I will put in the extra $25. I would also like to avoid doing a surface drive if at all possible.

[ejp]

Ummmmm. How about the bigger tabs and fins you were talking about then. Why not the surface drive???

[t3NHRacer]

I would do a surface drive but I dont want to put too much money in the boat. Where can I find bigger tabs?

[ejp]

You can make them really easily. Or you could buy some from offshoreelectrics.com

[t3NHRacer]

Thanks ejp

[water dog]

I might put a hyperformance .18 in my Nitrohammer. I am worried about stability. :o What could I do to help the stability at full speed if I got this engine? Big tabs turn fins? Any suggestions?

Here is the engine http://hyperprod.bizhosting.com/pull_start_15_inboard.html
Thats a nice motor .I believe its a rossi .I have seen the 18cvrm O.S. for 180.00 .This engine is for 125.00 .Not a bad price.They both produce about the same H.P..I would be happy with both of them.

[t3NHRacer]

Do you think the engine could push the boat into the low thirties?

[water dog]

I think it could .What does the hammer do in stock form?.

[t3NHRacer]

In stock form probably mid twenties.

[CFRACR]

The Hammer does about 25mph stock & running right in the right conditions. A high performace .18 may get it to 30, or even a smidge more. You will need to make bigger tabs though to keep the hull down. Easy to do!!!!

I would go with the water cooled from Hyperprod, that is if speed is what your wanting. The difference between the two is that the OS is more of a sport engine & the Rossi for racing!!!

There you have it :D

[Micho523]

What would be the advantages of having the Rossi over the OS (and vice-versa)? I am looking at getting a new engine myself :rolleyes:

[water dog]

I am putting a cen 18 in my boat this weekend .I sent it out for some porting and crank work and I just got a macs pipe and header for it today.Can you say PONIES!!.

[CFRACR]

A OS is considered a sport engine & Rossi, Picco, Mac, CMB, & other racing.
The racing engine typically will produce more rpm. The sport engines a little less rpm. The racing engines will normally wear out faster than the sport ones.
You can port and timing change the sport engines, but sometimes @ a cost. They are not really made/designed to produce the higher rpms like the racing ones are. So they have a tendency to blow up if you push them to far.

To some it up, if you are going to race then the racing engines are needed to be competitive. If your just going to run & race with buddies ect., then sport engines will do just fine & last longer.

[t3NHRacer]

Well after a lot of thought and changing of ideas I have decide I am going to buy the rossi motor and put it in my hammer. Is there anything else I could do to add stability besides trim tabs? Cfracer how fast is your nitro hammer (I think you have one right?), and did you change anything to keep it stable?

[water dog]

I have my 18 in now and I am not sure if the boat is really that much faster or not.I do notice that when I hit it from a cwal the motor cavitates a little and then takes off like a shot.

[t3NHRacer]

Did you get the rossi engine, or the cen .18?

[Watercadet]

if the RPM's of the motors are the same (which they prolly are) then why would it go faster with the same prop??? Stick a bigger prop on there to take advantage of the HP and torque of the larger displacement motor.

[t3NHRacer]

At least I know that the rossi engine will have more power then the stock .15

[Watercadet]

What makes you all think that the motor here: http://hyperprod.bizhosting.com/pull_start_15_inboard.html
is made by Rossi??? I don't even know of a Rossi .18. Is this all just going off what some guy said a few posts back?? The same guy that says OS is just a sport engine manufacturer?? That motor pictured looks to me like a a thunder Tigre motor that the Dynamite .15 is based on. Besides didn't you find that the motor that motor that Hyperperformance carried was a rear exhaust motor by XTM??

[t3NHRacer]

Umm I thought a few people said it was a rossi in this post and in a few other posts. My only guess would be that it is a .18 xtm custom water cooled motor, because I emailed them and that is waht is in the bruzer. Another clue is that it has the same hp and rpm as the .18 xtm car motor. I still know that the .18 would have a lot more hp and rp then the stock .15. I believe that watercadet put an xtm .18 in his miss bud which he then after a while sold to ejp, and it must of been a much better motor then the stock dynamite .15 in the miss bud, which is stronger then the .15 in the nitro hammer. So I beleive it should increase my speed by a good amount. But you are probably right, it probably isnt a rossi engine. Either if it is a rossi or the xtm engine I am still sure that it would increase my boats speed.

[CFRACR]

Well after a lot of thought and changing of ideas I have decide I am going to buy the rossi motor and put it in my hammer. Is there anything else I could do to add stability besides trim tabs? Cfracer how fast is your nitro hammer (I think you have one right?), and did you change anything to keep it stable?


Well I do have one, & run it here and there. As for speed, 25mph average.
I have done alot to this little boat, mostly to make it a trouble free little runner. I lightned the boats weight considerbly in many ways. Even got rid of the battery & replaced with re-chargable lighter pack.
I made my own sets of trim tabs, I made three different ones and gave them a shot. I have found the one shape/size that seems to work out perfect. NO REAL TURN FINS!!

[CFRACR]

What makes you all think that the motor here: http://hyperprod.bizhosting.com/pull_start_15_inboard.html
is made by Rossi??? I don't even know of a Rossi .18. Is this all just going off what some guy said a few posts back?? The same guy that says OS is just a sport engine manufacturer?? That motor pictured looks to me like a a thunder Tigre motor that the Dynamite .15 is based on. Besides didn't you find that the motor that motor that Hyperperformance carried was a rear exhaust motor by XTM??


Well I was said "Rossi" based on what was said before about that engine. I may be mistaken. I also might be confusing with another post. That dealer is a Rossi dealer so that may be how I thought that. My bad if its wrong.

And unless I am wrong, OS's are considered sport engines.

[t3NHRacer]

Cfracer how big were the trim tabs that worked best for you? So your boat still runs at stock speeds?

[water dog]

Did you get the rossi engine, or the cen .18?
I have the cen 18 1.2@20,000 rpm .My old 16 was 1.0 @20,000 .I have a carbon fiber 40mm prop onit now .its a3/16 shaft .What kind of prop would be a good upgrade?.

[CFRACR]

Cfracer how big were the trim tabs that worked best for you? So your boat still runs at stock speeds?


I am not sure of the exact size, just bigger. Longer & wider, also got rid of the turn fins.

Stock speed, not sure, never radarded it with the stock engine. I don't have the Aquacraft engine in mine. I have the Dynamite with a Mac pipe.

[water dog]

I am not sure of the exact size, just bigger. Longer & wider, also got rid of the turn fins.

Stock speed, not sure, never radarded it with the stock engine. I don't have the Aquacraft engine in mine. I have the Dynamite with a Mac pipe.How do you like the mac pipe ?.I have one and I trimmed a little off of it and so far I have found it to be nothing that great.Maybe I need to trim off some more .

[CFRACR]

I like it better than the stock one for sure. Its got a better sound(louder though) & gives way better throttle response.

I did not cut the pipe at all, just the header to make adjustments with the coupler.

[GRANT ED]

A friend of mine has a hammer with a mac's pipe and manifold while mine has the stock system. He has better throttle response but I have a higher top speed. He is going to start experimenting by shortining his manifold.