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-   -   RB Concept Engine Thread.. (https://www.rctech.net/forum/offroad-nitro-engine-forum/251409-rb-concept-engine-thread.html)

flysullivan 06-05-2011 08:20 AM


Originally Posted by Midnight (Post 9211770)
Ok here is the deal. With odonell 30% (regular) in my ws7 I could get 11:00 easily and that's with a 7.5 insert in my rc8t odo 97t plug. Last night I could barely get 7 min when I ran the new 30% speed blend. It also went from 220 to 244-273 in temps. Is my tune off maybe. I also had to open the idle gap 6 hours.

And you flamed out once! I couldnt keep my Ws7 running. I am considering hanging up the nitro while i can still get good money for my stuff. Then again, i may regret it! Got to figure that out asap.

Midnight 06-05-2011 08:46 AM


Originally Posted by flysullivan (Post 9211807)
And you flamed out once! I couldnt keep my Ws7 running. I am considering hanging up the nitro while i can still get good money for my stuff. Then again, i may regret it! Got to figure that out asap.

I opened the idle gap and it stopped the cutting off at idle. I was always told with a proper tune u shouldn't have to touch the idle. Does anyone have a good base setup for the new fuel.

NitroKiwi 06-05-2011 09:16 AM


Originally Posted by Midnight (Post 9211912)
I opened the idle gap and it stopped the cutting off at idle. I was always told with a proper tune u shouldn't have to touch the idle. Does anyone have a good base setup for the new fuel.

I'm not sure on my exact needle settings but I just switched to the new 30% on my WS9 and had to lean out the low end and the top end quite a bit, I think it was close to 12 hours on both, sorry I can't be more precise.

Given your reduction in run time I'd say it's too rich now as well.

Perhaps leaning out the low end will help your idle too.

I run RB #7 plugs.

Midnight 06-05-2011 10:10 AM


Originally Posted by NitroKiwi (Post 9212017)
I'm not sure on my exact needle settings but I just switched to the new 30% on my WS9 and had to lean out the low end and the top end quite a bit, I think it was close to 12 hours on both, sorry I can't be more precise.

Given your reduction in run time I'd say it's too rich now as well.

Perhaps leaning out the low end will help your idle too.

I run RB #7 plugs.

I guess I could be really rich still which is causing it not wanting to idle which in turn threw off all my other setting. She had plenty of smoke just not my usual run time. Thanks for ur info bro. I guess its worth a try since I just bought a case of that speedblend

NitroKiwi 06-05-2011 05:50 PM


Originally Posted by Midnight (Post 9212187)
I guess I could be really rich still which is causing it not wanting to idle which in turn threw off all my other setting. She had plenty of smoke just not my usual run time. Thanks for ur info bro. I guess its worth a try since I just bought a case of that speedblend

Yeah, I'm sure you'll get there. The tuning window on these WS engines seems to be quite narrow.

I gave up with monitoring the temp on this engine, just made sure there was always a little bit of smoke. Maybe a colder plug is worth a try though if you're really worried about the temp but it will make the tuning and the idle harder to get right obviously.

Midnight 06-05-2011 10:08 PM

What if I went from a 7.5 to a 6.5 insert.

NitroKiwi 06-06-2011 02:00 AM


Originally Posted by Midnight (Post 9214686)
What if I went from a 7.5 to a 6.5 insert.

Less air, less draw on fuel (better consumption) but less power. It's all relative to the HSN setting. It will just change the air fuel mix you need to tune to...

Chris Peralta 06-06-2011 06:11 AM

You shoul dnot have to open your idle gap that much to make the engine stay running. The idle gap determines how much air the engine gets and that should always be close. Close your idle gap back to where it always was and lean the LSN to get the idle stable. From what I have heard from others running that fuel, you will also have to lean the HSN as well. Everyone I have seen post about that fuel gets better fuel mileage with the speed blend when compared to the old fuel so your tune has to be way off.

Chris Peralta 06-06-2011 06:14 AM


Originally Posted by pedrinho (Post 9206249)
First of all I'm sorry for my english mistakes,I'm from Brazil and only have 15,so give me a break.
Anyway,I have D8 with a RB hobby9, I only ran it two gallons.But last week I completely forgot to chek if my airfilter was decently oiled.The result,dirt in my engine and two burned glowplugs.So I got home and opened my engine cleaned everything the best way I could with my byron gen2.I don't have that much experience(neither my father) so I came here to ask what more could I do?And is the 'life' of my engine to compromised?
Final observations:I ran two or three tanks whith it that day.
Any help or coment will be very helpfull.
PS:If is a page talking about this sorry for not finding it,there are a lot of great stuffs in this forum,however is really hard to find.


It's possible that the engine will be ok but it's hard to tell. If it ingested enough dirt to kill 2 plugs it was probably quite a bit of dirt. After you clean it all real good, hold the case to your ear while turning the bearings... If it sounds crunchy that's bad!! Also look at the piston and sleeve for some obvious scratches.

Last thing you can try is to just run it again and see if it will run. If you cleaned it real good and it still wants to die all the time it is probably done. Good luck man!!

pedrinho 06-06-2011 09:17 AM

Thanks for the help.
I ran it yesterday I didn't have it any problem.The engine fire up always in the first try.I guess that I was lucky.Now I have to wate so see how long thi engine will hold compression.

Chris Reilly 06-06-2011 02:44 PM

Is anyone looking for a 9863 pipe and header set? Works really well with the WS7 series of engines. I have 1 NIB with long square header.

NitroKiwi 06-07-2011 05:46 AM

Do any of you use cheaper bashing/ practice engines and swap out for race?

I've realised how many gallons I've gone through on the WS9 already and am wondering if I'm better off race tuning the expensive engine and using a basher for the other mileage.

I love throwing cash at these cars of course but to keep costs down and make it easy it would be great to leave the pipe combo as is.

Any thoughts?

Chris Peralta 06-07-2011 06:26 AM


Originally Posted by NitroKiwi (Post 9221309)
Do any of you use cheaper bashing/ practice engines and swap out for race?

I've realised how many gallons I've gone through on the WS9 already and am wondering if I'm better off race tuning the expensive engine and using a basher for the other mileage.

I love throwing cash at these cars of course but to keep costs down and make it easy it would be great to leave the pipe combo as is.

Any thoughts?


I like to keep several practice engines around. What I do is just rebuild an old engine and use those for practice engines.

NitroKiwi 06-07-2011 06:39 AM


Originally Posted by Chris Peralta (Post 9221440)
I like to keep several practice engines around. What I do is just rebuild an old engine and use those for practice engines.

Thanks. All RB or others that work with these pipes?

I'm guessing the F11 is a good shout for this...

Chris Peralta 06-07-2011 06:44 AM

Ya, all I run is RB. The F11 would make a great engine at a good price!!


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