Looking for a 7.5 OB
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RE: Looking for a 7.5 OB
I am currently looking in to the Rossi. I believe it would push a piped 7.5 tunnel over 50mph easily. I'm still in the same boat as you, and would appreciate any info on 7.5 mod power heads including the difference between these two Rossi's. Is one slightly newer than the other?
http://morrishobbies.com/product_inf...ducts_id=14004
http://hyperprod.bizhosting.com/7_5_...powerhead.html
Ryan
http://morrishobbies.com/product_inf...ducts_id=14004
http://hyperprod.bizhosting.com/7_5_...powerhead.html
Ryan
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RE: Looking for a 7.5 OB
Geets,
How close are you to Russelsheim or near Weisbaden? I'm near Hanau and always looking for people to run with.
Jamie
Did you get to go to Heilbronn?
How close are you to Russelsheim or near Weisbaden? I'm near Hanau and always looking for people to run with.
Jamie
Did you get to go to Heilbronn?
#6
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RE: Looking for a 7.5 OB
First ..... thanks Ryan and Ron for the info`s
Wiesbaden is just 35 minutes driving ( on the german Autobahn ) , my hometown is between Darmstadt and Mannheim !
Yeah , i was in Heilbronn on Saturday and i talked to some dutch guys who run MAC 21 outboards ..... nice boaters !
But no one knows anything about the Rossi`s Powerheads ... so i have to contact you guys in the great US [8D]
Wiesbaden is just 35 minutes driving ( on the german Autobahn ) , my hometown is between Darmstadt and Mannheim !
Yeah , i was in Heilbronn on Saturday and i talked to some dutch guys who run MAC 21 outboards ..... nice boaters !
But no one knows anything about the Rossi`s Powerheads ... so i have to contact you guys in the great US [8D]
#7
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RE: Looking for a 7.5 OB
They appear on the outside as only having the different colored heads. They did this also with their .21's, the Niagara's, Piranha's and Minarelli's all have the same exact specs, just different colors.
The first site is a new update though could it's possible that it is their latest release.
It's too bad that Andy and the gang at CMD didn't make a MAC .45 OB as there is a shortage of fast engines made. The class has just about died off because most people were using the K&B's. When they were sold to MECOA, it was (and still is) a shortage of parts.
The first site is a new update though could it's possible that it is their latest release.
It's too bad that Andy and the gang at CMD didn't make a MAC .45 OB as there is a shortage of fast engines made. The class has just about died off because most people were using the K&B's. When they were sold to MECOA, it was (and still is) a shortage of parts.
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RE: Looking for a 7.5 OB
Thanks for the info. Do you have, or have seen the performance of a Rossi O/B? I only have experience with their 40 size aero engine. It performed well and seemed to be excellent in fuel economy.
Also, what is a good pipe to match the Rossi up with? I've been looking at the Silver Bullet by Precision Boats.
Thanks,
Ryan
Also, what is a good pipe to match the Rossi up with? I've been looking at the Silver Bullet by Precision Boats.
Thanks,
Ryan
#9
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RE: Looking for a 7.5 OB
The Silver Bullet should be a good pipe to use on it. Jim Irwin did a lot of work with the Rossi's and found that they like to run a little on the warm side so if you dare to, restrict the water flow a little. I've found with my Rossi .21 that it seems to take forever to break them in, a good gallon or more of fuel so if you get one, don't be surprised if it takes a while for it to get up to speed. You may find that after break-in, you might be able to swing a larger prop than what others do. Start small then work your way up as the break-in continues.
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RE: Looking for a 7.5 OB
I'm having trouble postings pics. If you click on the photo in this [link=http://morrishobbies.com/product_info.php?products_id=14004]LINK[/link] it will be enlarged to a more viewable size.
Ryan
Ryan
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RE: Looking for a 7.5 OB
ORIGINAL: ryan_t888
Hey Mark
How much are they, and where do u get them? Do you have any experience with them?
Ryan
Hey Mark
How much are they, and where do u get them? Do you have any experience with them?
Ryan
$350 for the power head alone, no carb, no lower. Gary Prusse at G&M Models builds them. He can be reached at (630) 279-2451. Yes, I do have one on my 34" WOF.. Still breaking in the motor, taking it easy for now. Trying to get a bounce condition worked out. Might move the motor over to a Aerotech hull to see if that'll work.
As for the Rossi, check with Jul (wave waker on RCU). He has a Rossi 7.5 OB. From what I've heard about Rossi's are they are set to run alcohol, not nitro. One other item with Jul's is that there was a missing rubber seal on the water jacket. This could be the cause of some of the problems getting that motor to work. I've also heard from other racers, on the Rossi's 3.5, that the carb is junk. Replace it with a K&B or other and it'll work fine.
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RE: Looking for a 7.5 OB
I was looking at a tunnel that sold a while ago on another forum/site with a Nelsen 7.5. I really like the look of the block but it is a bit out of my price range. What are your speed predictions for the Nelsen?
Ryan
Ryan
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RE: Looking for a 7.5 OB
ORIGINAL: ryan_t888
I was looking at a tunnel that sold a while ago on another forum/site with a Nelsen 7.5. I really like the look of the block but it is a bit out of my price range. What are your speed predictions for the Nelsen?
Ryan
I was looking at a tunnel that sold a while ago on another forum/site with a Nelsen 7.5. I really like the look of the block but it is a bit out of my price range. What are your speed predictions for the Nelsen?
Ryan
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RE: Looking for a 7.5 OB
isaw OB NUT's Nelson engine and how it performed, this is for a real serious boater, kinda intimidating for a newbie though....lot of power on it, good lookin powerhead..
here's a pics of rossi,,,ready to go this weekend...
here's a pics of rossi,,,ready to go this weekend...
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RE: Looking for a 7.5 OB
Does anyone know a link to the Nelson motor or any info`s about it ?
By the way the rossi looks great [8D]
So i'm looking for a detail report after the weekend wave waker
By the way the rossi looks great [8D]
So i'm looking for a detail report after the weekend wave waker
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RE: Looking for a 7.5 OB
As for the site, yea, it's a few years old. There are no sites for the Nelson motor..