View Full Version : 2.5R revo motor
09-18-2005, 01:26 PM
I'm picking one up for a good deal. Can I just get the 4400# kit for the trx 2.5 conversion for my nitro sport?
I was going to do an OS .18 CRV but this is a pretty good deal and I've heard the R 2.5 is more powerfull than the regular 2.5
09-18-2005, 05:30 PM
The 2.5r is not more powerful than the 2.5. It has the exact same porting on the sleeve. There used to be a minor differnce, but they changed it back to being indentical. The only difference is the cooling head.
09-19-2005, 12:46 AM
Well either way I'm doing the swap. I won the e-bay auction.
This thing already hauls pretty good but is kinda slow to get up to speed. Hopefully this adds some pep. Its got the old old .15 sport in it.
09-19-2005, 03:12 PM
So uhhhh... how much faster is this thing gona go? I got the 4400 conversion kit coming too.
09-19-2005, 04:59 PM
There will be a significant difference in acceleration and top end. The 2.5 is a much more powerful engine than the .15 and Pro .15. Just make sure to do the proper break-in so you dont damage the engine. You'll be very satisfied.
The only down side that I hear on a constant basis is that the 2.5 is more tempremental with its needles settings compared to the old .15s. But that's to be expected with a slide carb engine that greatly overpowers the old engines.
09-19-2005, 06:31 PM
Very cool. Thank you.
Its one thats already broke in so I can just let-r-rip.
09-21-2005, 06:19 PM
Hopefully it's not broken in too much! I seem to always regret buying used engines, but maybe your luck will be better. The 2.5 in a Rustler is a real power house, it's kind of overkill actually. I'm building one up now, but plan on running some bigger diameter tires for bashing, and I'll gear down to a 16t C-B.
09-22-2005, 12:15 AM
I have a 22T on it now. It takes forever to get up to speed and has bad low end. But once it gets up there it moves.
Think I should get an 18T with the 2.5R?
09-22-2005, 03:14 AM
The stock 2.5 Rustler runs a 20t, which makes for wheelies with the batteries in the stock rear location. I think if you moved the battery pack to the front shock tower, an 18t would work fine.
09-22-2005, 03:07 PM
Sweet. I'll just run a 20 then. The other thing is that I'm at high altitude. I'm sure it messes with these things like it does with racing real cars.
09-22-2005, 04:00 PM
It does! We used to go camping at this lake that was at only 3500 feet elevation, and both our outboard motor, and our R/C boats didn't have the power they did near sea level.
09-25-2005, 11:48 AM
The nitrosport is really light in the front. Its gonna be tuff keeping the front wheels on the ground. I had the 2.5 in my nitrosport with a stinger exhaust. I needed a new set of tires every 3 runs :D I wish I didnt have to sell it:(
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