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Old 11-20-2007, 07:56 PM   #136
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yeh just ordered the boca bearing for mine the rear bearing in my plus21-5t was getting a bit rough at the 3 gallon mark

never had a problem with flame outs and I'm running #7tc's all year round
and easy to tune

so definately run your plus 21-5 or you wont know what you've missed
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Old 11-20-2007, 08:19 PM   #137
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hey retro , what is the weather like where you are ??? nova 7 plugs are pretty much unrunnable everywhere i have been !!! they are so cold you have to leave the igniter on the plug for like 10 sec. or more or else the engine dies nova 6 , odo 77 , or mccoy mc8 are my three fav plugs mccoy mc59 or mc9 suck though
later , monty
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Old 11-20-2007, 08:28 PM   #138
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Houston, can you really tell the diffrence from the 5, and the 5k?
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Old 11-20-2007, 08:38 PM   #139
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yes the cases are a lil different , seperate diverters for fuel flow on the 5k block .
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Old 11-20-2007, 08:39 PM   #140
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How much performance could there really be?
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Old 11-20-2007, 09:48 PM   #141
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Keep your eye on the front bearing as well. Mine leaked. Replaced with the Boca front bearing and it's a perfect seal.
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Old 11-21-2007, 01:00 AM   #142
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Boy, i better change the bearings on my motor while im ahead.
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Old 11-21-2007, 04:15 AM   #143
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My 21-5K is a 'Hot Mod' motor. Bearings have been replaced...
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Old 11-21-2007, 11:32 AM   #144
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Originally Posted by freefallmarine View Post
Boy, i better change the bearings on my motor while im ahead.
Hey, let us know how the bearing feels or the wear if you take it out.
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Old 11-21-2007, 03:06 PM   #145
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I can't understand why I have seen so many bad rear bearings in the plus engines??? I have all the original 14mm cranks in all my Novas so I have not seen this ,well except for one- My Crono RS 7 litteraly granaded !! rightfully so though ,that engine would turn !!!! And with the heavy crank in it ,it just killed the bearing and it self. Piston and sleeve still good though
One day last summer I decided to try this piston/sleeve in another engine block to see what results I might get ? Well I put it in a 421B block (and crank) Well the results were simply stunning to say the least!! Took some doing to get it tuned ,had to start wicked rich and snuck up the final result.
8 plus minutes of run time and the SMOOTHEST power you can imagine !
It was so smooth and did I mention FAST!!! YEAH BUDDY FAST !! You could accellerate through a corner like nothing you ever saw. I would still be running this combo but it likes to be rich on the bottom, and here in NE it gets too cold at night and I had issues keeping it lit (temps under 60). So I went back to the original 8 port sleeve. Not nearly as much topend but more dependable in the cold
So as far as piston/sleeve swaps you can put a 5 port sleeve in a 7 port case all day long ,going the other way though ?? The transfer port fins(if your engine has them) may cause an issue with blocking ports.
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Old 11-21-2007, 08:35 PM   #146
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Quote:
Originally Posted by houston View Post
hey retro , what is the weather like where you are ??? nova 7 plugs are pretty much unrunnable everywhere i have been !!! they are so cold you have to leave the igniter on the plug for like 10 sec. or more or else the engine dies nova 6 , odo 77 , or mccoy mc8 are my three fav plugs mccoy mc59 or mc9 suck though
later , monty
Hey houston,

I'm in New Zealand, and our temps range from around 10-12 degC in winter to around 25-30degC in summer but pretty humid all year round

the 5T seems to run pretty well on the cold plugs all year but is a little harder to fire up over winter and I've never suffered a flame out with this engine yet -Go figure haven't tried a 6 yet but definately will

I just got my hands on a Collari B7evo and it wont run with 7s at all and 5s are way to hot and I've been waiting for 6tc's to come back into stock localy for awhile

I also use 7tc's in my gotech 7port turbo with no probs

adrian
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Old 11-21-2007, 08:44 PM   #147
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id get rid of it ay

IMO Novarossi's new .21 offroad plus series motor's are Junk at the moment nothing like the old P5X theres a thread on the new 367 with nothing but problems
the P5X hands down is the greatest engine novarossi ever made...
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Old 11-21-2007, 08:51 PM   #148
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the P5X hands down is the greatest engine novarossi ever made...
Amen to that
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Old 11-22-2007, 02:13 AM   #149
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hey Houston,

have you tried the 9901 pipe or a nova 2052 with the square header on a plus5t before if so what where your thoughts as you seem to know more on rossi's than anyone on here

any help would be great TIA

adrian

Last edited by RETRO RC; 11-22-2007 at 02:25 AM.
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Old 11-22-2007, 11:56 AM   #150
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i havent personally drove the car , truhe was driving , i was testing / tuning it with my plus 21-5 and the 9901 made good smooth power with no real powerband effect (which i like) like the 86 pipes . it was smooth which might go better with the standard tri-angle crank design of the p5 and such engines , not too good for the full face plus cranks in my opinion . as far as the 2052 , i havent tried or tested one . sorry man .my favorite pipe of all time is the RScompetition efra-rs2032 if you can still find one buy one , it is a badass pipe and killer in the buggy with square header and in a truggy with a round(jammin style) header !!! i would buy 4 or 5 if i could find em .
later ,
Monty
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