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Old 05-16-2008, 11:18 AM   #16
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Originally Posted by ezveedub View Post
The K engines have two relief ports under the exhaust port. The head button is also changed. It runs the same balanced crank though.
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the vertical transfer ports have been switched to the other side of the horizontal transfers , on p5, p5x, p5xs, plus 21-5 the verticals are closest to the exhaust , on 21-5k they are closest to rear main intake with diverters in the block to match . new style thick top ring sleeves to hold pinch at peak performance pinch longer is also another difference .
plus 21-5 is a great engine and if you wanna buy a 7 port piston/sleeve or 421b (821b) p/s set and make it faster you can .
hope this helps ,
monty
I hope this helps. ezveedub and houston answered a couple days ago. Great info and very helpful. thanx again guys.
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Old 05-16-2008, 04:30 PM   #17
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hi Houston,

what is the main different between the plus21-5 and plus 21-5k? plus 21-5k is a newer engine compare to the plus21-5 , but strangely is that how come the plus21-5 is stil more costly.
mind sharing what is the major different between this two engine ?
on the other hand in buggy racing turbo or non-turbo are better?
hope u don't mind sharing your knowledge. thanks
are you talking about on track performance? the differences i noticed (pipe , clutch and plug being the same) between the two is that the k porting design is a little more efficient and a lil more explosive but longer powerband . just takes forever to break the piston/sleeve sets in i am making my favorite engine lately though (hope novarossi starts putting them out too) 421b (821b) p/s/r set in a plus k or plus 21-5 block with turbo button = bookoo power ( hope this helps )
happy motoring ,
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Old 05-17-2008, 12:17 AM   #18
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that is good elaboration. yeah i guess a turbo button is a better and more explosive on the plus 21-5kt.
thanks alot.


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Originally Posted by houston View Post
are you talking about on track performance? the differences i noticed (pipe , clutch and plug being the same) between the two is that the k porting design is a little more efficient and a lil more explosive but longer powerband . just takes forever to break the piston/sleeve sets in i am making my favorite engine lately though (hope novarossi starts putting them out too) 421b (821b) p/s/r set in a plus k or plus 21-5 block with turbo button = bookoo power ( hope this helps )
happy motoring ,
monty
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Old 05-17-2008, 08:07 PM   #19
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Turbo buttons offer more power though a better seal and combustion chamber, but can be more difficult to tune as they are more sensitive to weather changes. If you order an engine and want a turbo version, order it as such since its cheaper than getting a turbo head after.
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Old 05-17-2008, 09:03 PM   #20
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Turbo buttons offer more power though a better seal and combustion chamber, but can be more difficult to tune as they are more sensitive to weather changes. If you order an engine and want a turbo version, order it as such since its cheaper than getting a turbo head after.
definitely it will be cheaper to get a turbo engine straight away rather then add in the turbo button later.

by the way any tip in running in engine ?
how do u keep it idle coz usuali after i pluck out the glow heater its just die off and i got to pry the flywheel again.

does loosening of the plug helps?
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Old 05-17-2008, 10:01 PM   #21
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does loosening of the plug helps?
Yes. Plus a heat gun, or hair dryer to warmup the engine case and head first.
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Old 05-17-2008, 10:03 PM   #22
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Yes. Plus a heat gun, or hair dryer to warmup the engine case and head first.
ooooo. a hair dryer. i totally forget bout it. thanks
btw does you guys run it with 5 tanks of 125cc straight without letting it cool down first, or u guy do it run 1 tank then let the engine cool down and start it again ?
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Old 05-17-2008, 10:14 PM   #23
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That's a good question. I think as long as you get heat in the motor so the metals "seat in", then let it cool down a bit, but then get heat back in. That should do good for most engines out there. Heat cycling.

A friend told me today about a break in procedure by Drake. Apparently running the engine for 5 tanks straight, trying to not let it stall. He would vary the temp from 120 F up to 200 F by tuning the needles. I'm not sure though as I didn't read about it.
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Old 05-17-2008, 10:25 PM   #24
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You can heat cycle the first five tanks, then start to run it around rich, but keep the temps up. I always try to get the engines up to 200+F and I usually use a low nitro/high oil fuel. This way, I can lean the engine to keep it running and heat it up, but still keep it oily for the break-in.
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Old 05-17-2008, 10:26 PM   #25
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wow. Drake use such a run in procedure too. well i think he dont really need to run it in well. he is a sponsor driver.

i believe that we should run it 1 tank and let it cool and start it again.

well i have also heard of a guy running in engine with big tank and he uses a big fan to cool the engine when its still running.

just too many type of running engine.




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That's a good question. I think as long as you get heat in the motor so the metals "seat in", then let it cool down a bit, but then get heat back in. That should do good for most engines out there. Heat cycling.

A friend told me today about a break in procedure by Drake. Apparently running the engine for 5 tanks straight, trying to not let it stall. He would vary the temp from 120 F up to 200 F by tuning the needles. I'm not sure though as I didn't read about it.
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Old 05-17-2008, 10:31 PM   #26
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Onroad guys will bench the engine WOT for a few tanks, then run it.
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Old 05-18-2008, 06:58 AM   #27
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Onroad guys will bench the engine WOT for a few tanks, then run it.
yeah i guess on road engine is not so time consuming. just 1 or 2 tank and straight to the track and start leaning it down.
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Old 05-20-2008, 03:28 AM   #28
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I have a stock P5XS for my buggy and a RB mods P5X for my truggy. Any suggestions on Pipes and glow plugs? I run 30% sidewinder and JP-1-2-3`s on my other stuff?
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Old 05-21-2008, 10:19 PM   #29
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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?
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Old 05-30-2008, 01:32 AM   #30
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Okaaaaay. Had a look a the selection of Novarossi plugs. Yikes. So I guess I'll start with this question:

What are the differences between a #4,5,6,7,8 plug. All of them can come in standard plugs. Uhhhhhh....NEVERMIND. Geez, it pays to use the filters when searching online.

#4--Very Hot
#5--Hot
#6--Medium
#7--Cold
#8--Very Cold

And then you can select from Heavy Duty or Regular. Sorry guys.
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