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Old 05-30-2008, 02:08 AM   #31
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Is the plus 21-5 crank the same as the 421b? Ie. Can I replace the p/s/r in my plus 21 with a 421 set?
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Old 05-30-2008, 09:52 PM   #32
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cranks are different but p/s/r set will fit in perfectly ! dont forget to have the bearings changed
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Old 05-31-2008, 04:33 AM   #33
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As long as both cranks measure 14 mm your fine, only thing you might want to do is measure the crank opening, hot cranks are in the 9mm range and the rest are 10mm or more .
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Old 05-31-2008, 06:04 PM   #34
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Quote:
Originally Posted by air8 View Post
There's NO WAY I'm going to try to mod a sleeve so this is just an off-topic question I guess--What effects will raising the roof of the exhaust port do?
Raising the roof of the exhaust port will increase max horsepower but that power will come at a higher rpm and with a more narrow power band.

Generally off road motors use shorter exhaust durations (lower port height) with longer intake durations (higher transfer ports) to get more bottom end torque and a broad power band. On road motors will use very long exhaust durations (high port) with shorter intake durations to make more max power.
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Old 05-31-2008, 06:54 PM   #35
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Air8, the #6 is the preferred all around plug on the 21-5k.

I have two of them in my vehicles (RC8 and 8T) and run them at the track three times a week. One I have been experimenting with glow plugs, the other I use recommended #6 in.

So far the only good match has been the Mcoy #59 plug. It runs as well as the nova plug if you don't have nova plugs available.
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Old 06-01-2008, 10:19 AM   #36
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As long as both cranks measure 14 mm your fine, only thing you might want to do is measure the crank opening, hot cranks are in the 9mm range and the rest are 10mm or more .
the plus cranks are 14.5mm and the old cranks are 14mm .
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Old 06-01-2008, 11:15 AM   #37
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Thumbs up Need some help with one of these....

I have a customer with one of these and his ear broke off the side of his case. Anyone have an older one they want to get rid of? What I am looking for is a case I can salvage. He might have 1 - 2 gallons left of the rest of his internals.
Let me know,
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Old 06-01-2008, 10:39 PM   #38
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Thanks for the response guys. I'm really liking the Plus21-5. I think it's a good match for me right now. I'd like to start acquiring pipes for different tracks. Most of the tracks I run at are mid sized to smaller, with the occasional RC Pro race track that is larger. So this engine will be a great performer everywhere.
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Old 06-08-2008, 08:40 AM   #39
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Ok this is my first nova based motor(21 plus 5 stock out the box) and need help with what plugs work with these motors do they like cold or hot? I'am in kansas so the weather changes alot from dry hot too humid hot, like 90-100 deg. I'm using jp2 pipe 25% byr. gen2 fuel.

Thanks For any Help!
Please ask if need more info.
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Old 06-08-2008, 12:24 PM   #40
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What's up buddy?

I had two flameouts during the Main yesterday. IDK. It sounded like the engine started getting lean on bottom after about 10 minutes into the race. But the same thing happened to two other guys. That Kansas weather---there's no way around it. LOL.
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Old 06-08-2008, 05:29 PM   #41
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Nova short bodied #7's.
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Old 06-08-2008, 05:50 PM   #42
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best plugs are mccoy mc8 or odonnell 77 no flames , great running and good performers !!!! plugs are important !!!
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Old 06-08-2008, 07:59 PM   #43
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Thanks HOUSTON for the reply I'll give them a try got some orderd.
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Old 08-22-2008, 11:01 PM   #44
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Ok Houston. I'm gonna try to stump you.

A few years back Novarossi made a 6-port blue head .21 called the N21B 2000, not the N21B 2001. I had a runaway right after I broke in that 6-port engine which scored the piston and sleeve pretty bad. Do you have any idea if a p/s from another engine will work in that 6-port case?

It's not a big deal since that engine is sitting in pieces and has been for a year now. Just wondering if a unique mill could be had by combining parts.

Good luck.
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Old 08-30-2008, 02:18 AM   #45
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I'd like to consider the 821 p/s switch. Is there anything else I need to switch at the same time? Like rod, crank, backplate?
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