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RE: Official RB Engine Thread! - 12/16/2007 9:35:17 AM   
squeeguk



Posts: 483
Joined: 3/21/2004
From: Camberley, UNITED KINGDOM
Status: offline 		Hey Ttoks, I'm with you on the Holden mate, love those beasts.

As for the left turn lean, I had the pressure line short and same issue. It does it even when the tank is low, which means that no fuel should be able to get into the pressure line which means that the pressure in the tank can't be causing it, so not sure if that is the reason?????

We're off to the track soon, so I'm gonna go cut my fuel lines short like I had them before.

By the way, what are the symptoms of a leaking front bearing??


_____________________________

Traxxas Revo 3.3 with RB TM523 - Spektrum DX3.0
Hobao Hyper ST Pro - Spektrum DX3.0

(in reply to snoking16)
       Post #: 176

RE: Official RB Engine Thread! - 12/16/2007 10:26:24 AM   
ttoks



Posts: 3665
Joined: 3/15/2007
From: leongatha,VIC, AUSTRALIA
Status: offline 		even with an almost empty tank you can experience this problem, think about it, there can be a few G's involved in a high speed turn, and is certainly enough to get the fuel moving around the tank, although during break in the engine should be rich enough that you can't notes the issue, so i could be that your are to lean, no matter what you do you'll always experience it (i did get it with my RB when i was to lean).

the only other thing i can suggest is trying a lap around the tank in a counter clockwise diction from the pressure tap to try and fix the problem, otherwise you can either put up with it, experiment with pressure line positioning, or do the tekno tank conversion.

a leaking from bearing is the same as any other air leak, the idle will not stay steady, it will constantly be changing between a high to low idle, and it will not hold a tune, also of your running in dirt, you'll get a lot of dirt sticking to the front of the crankcase near the flywheel.

< Message edited by ttoks -- 12/16/2007 10:28:35 AM >

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       Post #: 177

RE: Official RB Engine Thread! - 12/16/2007 12:46:26 PM   
megamaxx


 

Posts: 1790
Joined: 3/20/2007
From: tampa, FL, USA
Status: offline
quote:

ORIGINAL: ttoks

well not really, the 523 does have a little more top end, but performance wise the 323 and 523 are not that dissimilar, the biggest difference to reliability, the brass carb slide on the 323 was prone to wearing out quickly, while the chrome plated one on the 523 is much much more durable.

now beer, about the holden and ford, you better be for the winning team (which be the holdens)

just ran into that issue a couple weeks ago on my 323,the carb off a 523 should fit the 323,right?


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       Post #: 178

RE: Official RB Engine Thread! - 12/16/2007 4:48:48 PM   
supertib


 

Posts: 3380
Joined: 3/30/2004
From: , MB, CANADA
Status: offline 		post edited.....

< Message edited by supertib -- 12/17/2007 1:13:24 AM >

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       Post #: 179

RE: Official RB Engine Thread! - 12/16/2007 7:25:53 PM   
ttoks



Posts: 3665
Joined: 3/15/2007
From: leongatha,VIC, AUSTRALIA
Status: offline 		now now tib this isn't a thread discussing which is better, this is simply an information thread for owners of the RB engines.

but running head to head i have seen the RB outperform the picco in most situations, out of the hole the picco gets the RB, but the RB is much smoother and more controllable, similar to why people run .21's instead of .28's, and also pulls harder on the top end, perhaps the dyno's are saying different, but we all know the dyno number are just a reference to an engine performance.

oh and the TM523 has been changed very dramatically to the sirio, the 323 is very similar to the sirio, but the 523 has little goodies like a 14.2mm crank, of course 9 port sleeve, and RB's MES, you should know all this already?

oh yeah and mega the 523 carb is a direct fit to the 323.

< Message edited by ttoks -- 12/16/2007 7:29:00 PM >

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when the cop pulls you up doing 234 km/h and asks if you knew how fast you were going, say "yep i had cruise control on

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       Post #: 180

RE: Official RB Engine Thread! - 12/16/2007 7:30:48 PM   
squeeguk



Posts: 483
Joined: 3/21/2004
From: Camberley, UNITED KINGDOM
Status: offline 		Well I cut my lines down as short as they can possible be. Was at the track and noticed that she was running really lean, loads of smoke, but all the usual symptoms, cutting at WOT, popping on the overrun. Checked the temps and they were around the 245 mark. Hope I didn't do much damager as it was less than 1/2 tank like this and not much WOT, strange thing is, there was still a ton of smoke coming out the exhaust.

I hadn't touched the needles at all since last time and then it was so rich, it was actually 4 stroking, must have been because the temps were really low today, down at around 4 C.

I richened it up a half turn at a time and considering she was at around 6 turns out to begin with, I ended up at around 8 turns out. She's running slightly rich, but rather that than lean.That makes it 12 tanks now. I think I'm going to run it like this until it get's warmer and then start leaning it. After richening temps were around the 180F-190F mark. I didn't get much chance to check out the leaning issue, as the track was really muddy and by the time I got her running right, we had to leave, I only got through 2 tanks today. I will check it out next week and see, but it did seem to be better????

Oh and I think my front bearing is OK as it holds an idel perfectly.

< Message edited by squeeguk -- 12/16/2007 7:32:13 PM >


_____________________________

Traxxas Revo 3.3 with RB TM523 - Spektrum DX3.0
Hobao Hyper ST Pro - Spektrum DX3.0

(in reply to supertib)
       Post #: 181

RE: Official RB Engine Thread! - 12/16/2007 7:31:04 PM   
megamaxx


 

Posts: 1790
Joined: 3/20/2007
From: tampa, FL, USA
Status: offline 		thanx ttoks.appreciate it


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       Post #: 182

RE: Official RB Engine Thread! - 12/16/2007 7:43:41 PM   
ttoks



Posts: 3665
Joined: 3/15/2007
From: leongatha,VIC, AUSTRALIA
Status: offline 		hang on hang on, first things first, ALWAYS keep the temps above 230, to cold will ware the engine out very very quickly.

now, here what i'm having a bit of trouble with here, 8 turns this engine shouldn't even run, 8 turns out shouldn't be slightly rich, 5 turns out would be close to slightly rich even at 4 C, so theres a problem (oh and that poping, or should i say stuttering sound when you let off the throttle isn't a sign of being lean, that's in fact the exhaust system doing that, has nothing to do with the engine whatsoever) i'm thinking you may have an air leak if at 6 turns out you were getting it cutting out at high RPM.

i suggest doing the soap test, take the engine out, clean it, then cover both the exhaust port and the carb intake with your fingers, turn the crank to bottom dead center, then place some fuel line on the carb nipple and blow into it, while blowing brush some soapy water around the front bearing, the carb (paying special attention to the high and slow speed needles) and backplate and look for small bubbles, if you see bubbles you have an air leak, if you have an air leak, call RB and i have no doubt they'll treat you well.

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when the cop pulls you up doing 234 km/h and asks if you knew how fast you were going, say "yep i had cruise control on

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       Post #: 183

RE: Official RB Engine Thread! - 12/16/2007 7:51:25 PM   
squeeguk



Posts: 483
Joined: 3/21/2004
From: Camberley, UNITED KINGDOM
Status: offline 		Yowzers, I was wanting to take it out anyway as the track was so darned muddy. I will definitely do that leak test, but tomorrow evening. I was quite surprised myself that at 6 turns out it was so lean. I thought that popping sound was a lean condition that Traxxas talks about in the manual, go figure, they talk about a popping or clattering sound, it stopped when I was running rich, that's why I thought that's what they were talking about. I know that with my TRX I was running at around 4 1/2 turns out and that was ideal.

Thanks very much for the advise ttoks, I will definitely have a gander and check it out. Will let you know.


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Traxxas Revo 3.3 with RB TM523 - Spektrum DX3.0
Hobao Hyper ST Pro - Spektrum DX3.0

(in reply to ttoks)
       Post #: 184

RE: Official RB Engine Thread! - 12/16/2007 7:55:18 PM   
ttoks



Posts: 3665
Joined: 3/15/2007
From: leongatha,VIC, AUSTRALIA
Status: offline 		your welcome, oh yeah, and check the fuel and exhaust system for leaks as well, they will cause the engine to run lean if the fuel tank or exhaust gaskets are leaking, or if you have a split fuel line.

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when the cop pulls you up doing 234 km/h and asks if you knew how fast you were going, say "yep i had cruise control on

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       Post #: 185

RE: Official RB Engine Thread! - 12/16/2007 8:05:18 PM   
squeeguk



Posts: 483
Joined: 3/21/2004
From: Camberley, UNITED KINGDOM
Status: offline 		Cheers will do, I think the fuel lines are OK though as I put new lines on today, but will check all the other stuff too.


_____________________________

Traxxas Revo 3.3 with RB TM523 - Spektrum DX3.0
Hobao Hyper ST Pro - Spektrum DX3.0

(in reply to ttoks)
       Post #: 186

RE: Official RB Engine Thread! - 12/16/2007 8:16:05 PM   
ttoks



Posts: 3665
Joined: 3/15/2007
From: leongatha,VIC, AUSTRALIA
Status: offline 		hang on, what's happend here, seems a mods decided to mvoe this thread to the engine forum even though it was made by jarret to specifically discus the RB Tm 323 and TM 523 in traxxas vehicles...

to whomever it was that moved it, it would be nice if it was moved back to the traxxas forum.

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when the cop pulls you up doing 234 km/h and asks if you knew how fast you were going, say "yep i had cruise control on

(in reply to squeeguk)
       Post #: 187

RE: Official RB Engine Thread! - 12/17/2007 8:28:58 PM   
squeeguk



Posts: 483
Joined: 3/21/2004
From: Camberley, UNITED KINGDOM
Status: offline 		Hey ttoks. I haven't had a chance to check for leaks yet, the carb retaining bolt stripped when I tried to remove it, go figure. I think my Schumacher hex head crew driver is a little stuffed.

I did however manage to get the EZ start off and am a little concerned. There was a lot of grey residue, you know like when you wet sand aluminium or something. Should I be concerned or is this normal. I just been flushing out my engine with some WD40. The engine still has tons of compression, but the pinch seems to be minimal. I cannot believe that this engine can be that worn out after just 12 tanks. Any advice?

I haven't opened the engine to check it out inside yet.

< Message edited by squeeguk -- 12/17/2007 8:30:11 PM >


_____________________________

Traxxas Revo 3.3 with RB TM523 - Spektrum DX3.0
Hobao Hyper ST Pro - Spektrum DX3.0

(in reply to ttoks)
       Post #: 188

RE: Official RB Engine Thread! - 12/17/2007 8:39:44 PM   
squeeguk



Posts: 483
Joined: 3/21/2004
From: Camberley, UNITED KINGDOM
Status: offline 		Ok, just had a look inside the engine through the exhaust outlet. I can see a few very fine scratches on the piston and on the sleeve in the pinch zone. The pinch zone looks highly polished. What could be causing the fine scratches. There are not many, just a few that I can see. Without taking the whole thing apart, I cannot tell how the rest of it looks. I am thinking of sending the engine in and asking them to giv