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Ribbed for who's pleasure?

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B

Bayer-Z28

RCTalk Basher
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  1. Bashing
That HPI pipe certainly isn't ribbed for the engine's pleasure. There's no cone and it's just straight through/wide open. I was thinking about this on my way home earlier.

Following 2 cycle engine theory:
Q:Why is it bad for a 2 stroke to have little or no back pressure?


A: Burnt piston. If there is little back pressure, there is nothing to really hold the 'fire' in the cylinder. Over time it can errode the clynder near the exhaust port and you will lose compression, scar the cylinder, scar the piston wall(s).. etc etc.

Also. When there is lower back pressure, you lose the torque, or the low end, off idle grunt. Wanted the ofna pipe, but I wanted something different for now.

Just picked up an HPI Tuned pipe. Going to take the truck out now.



-=EDIT=-
Gotta wait till tomorrow to re-tune it. Can't see the exhaust or the car and it's getting cold. Supposed to be nice tomorrow! :D 47*! It fired right up a couple minutes ago. Plugged the exhaust just long enough to push some fuel into the lines, sputtered, waited and fired up.

I gotta find a small piece of aluminum tomorrow to measure and cut to 1mm so I can measure the throttle spacing. Re geared it and installed new clutch shoe springs. Got a servo-saver kit, but I'll install that tomorrow or this weekend.
 
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Mine has just been nothing but buggy with the pipe. Gonna tune it tomorrow. Supposed to be 50!! Maybe I'll take the car out! :D :D

And thanks for the paper clip idea!
 
i liked my ribbed pipe as well. the hpi polished runs similar, but isnt quite as loud.
 
^ I can get it to run great. Pulled wheelies when I first got it when I retuned i, then shut it off went to run it the next day, bogged and sputtered.
 
Same altitude. Same temps. No back-pressure just bothers me on this. There probably is some. I mean, enough to supply pressure to the tank for the fuel. It's nice today. Gonna take it out soon and retune it for the new pipe.


-=EDIT=- This will be the first and last Nitro truck I get. Spend more time messin with it than I do running it. I can't leave well enough alone... No 2nd gear now for some reason. Gettin a brushless EREVO next.. No time soon though @ $600.
 
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i have a ribbed pipe, on mine since i first got it. never a problem. loud lil thing tho.
not a performance difference just louder. lol I really think its your engine and/or tuning and not the pipe.
 
I've been running the ribbed pipe for a long time now. Noticed a big boost in low to midrange. For a monster truck, and the way I bash I think it's just about right.
 

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