NOVAROSSI Engine thread....
#1488
#1490
Did you break it in Or just start racing it ? How tight is the pinch ?? I know.with my btt it was super tight which caused idle issues ,I just turned it up till it broke in. The way you describe your situation tho I think its a tune issue .your going thru plugs ,don't idle and it has no power . This engine.has a smooth bottom end but plenty of power and the top end is Insane . Btw OS plugs in a nova is a no no stick to nova ,many people say od
works I have no experience with them so I can't comment on.them
works I have no experience with them so I can't comment on.them
#1492
Holycrap it is taking for ever to break this BTT in. I have something like 34 tanks on it and it is still detroying my starter box wheel. I sure hope it is worth it in the end. I would love to race it but it seems down on power still too.
#1493
Or you've got a bad starter box

34 tanks is about 20 beyond where the engine will start running nicely
#1494
Hi, I have a new (2 race) novarossi plus 21-4btt on my mbx6 and I really disappoint with it
My idle is very unstable
My top end is very bad
I have a lot a flame out in my last race
I use it with the 41039 manifold
I put it another .1 shim because the engine broke 4 plug
But Nothing seems to work
I use p3 p4 from os
i use novarossi 5 6 7 plugs and nothing
I test the 9901 and 9853 and was a little better with the 9901 (to end)
What is wrong? I test the fuel with my other engine (ninja) and work fine
I really disapoint
What else I can test?
Thanks in advance
My idle is very unstable
My top end is very bad
I have a lot a flame out in my last race
I use it with the 41039 manifold
I put it another .1 shim because the engine broke 4 plug
But Nothing seems to work
I use p3 p4 from os
i use novarossi 5 6 7 plugs and nothing
I test the 9901 and 9853 and was a little better with the 9901 (to end)
What is wrong? I test the fuel with my other engine (ninja) and work fine
I really disapoint
What else I can test?
Thanks in advance
Use 0.80mm total head shim stack. .30/.30/.20 for 30% nitro.
Use 0.75mm for 25% or 0.70 for 20%
Use Novarossi C6TGC glowplug, or OD77T; or OD97T. C6TGC preferred; otherwise start with 77T.
I assume you meant 41029 manifold for Mugen?
Pair with 9901 pipe.
Remove fuel tank from vehicle. Pressure test the tank in a soapy water solution (submerge tank). Place finger over fuel pickup, apply pressure by blowing on the pressure line. Observe results to see if any bubbles are seen escaping the tank. Any kind of air leak will cause tuning issues.
Run all fresh pressure/fuel lines on the car.
Replace all clutch shoes and ensure they are operating properly.
The following statements are based on running the engine in a 1/8th buggy on a typical dirt-track in a racing environment...and the engine being broken in (at least 2-quarts of fuel or more).
6.5mm carb insert.
Place LSN 1/8th turn in from flush.
Place HSN 1/2 turn in from flush.
Set idle speed to have 0.50mm air gap (set with restrictor removed), or start the engine and adjust it accordingly once warmed up to operating temp on the starter box. (I'm betting it's way off).
Once running at operating temp, adjust the HSN until proper performance is achieved. With a head temp of 220F- 260F; the idle speed should be stable and fairly low.
#1495
Personally, I would not run a ceramic front bearing due to dirt intrusion. The steel balls take the abuse slightly better than ceramics, which hate any kind of dirt; but that's your call. I'd run steel in front.
9901/41021 still the setup to use.
#1496
Heat gun and a mugen box. It is still so tight. Right now I am thinking it may not like the Werks Clutch. I'm gonna try a regular three shoe and she if she wakes up. The clutch is the only thing I have not changed or tried yet.
#1497
some fuels are horrible for breakin...OD fuel for example lubricates soo well that engines take forever to loosen up.......breakin times can be doubled just by what fuels you use,,,,
#1498
Never run OS plugs in a Novarossi. Taper is different; now that you have seated an OS plug into the button, you may have to buy a new button.
Use 0.80mm total head shim stack. .30/.30/.20 for 30% nitro. I had 0,80mm, but the plugs become broken, but I will test again
Use 0.75mm for 25% or 0.70 for 20% Ok I will test, i used to run 25%
Use Novarossi C6TGC glowplug, or OD77T; or OD97T. C6TGC preferred; otherwise start with 77T.
I assume you meant 41029 manifold for Mugen? Yes
Pair with 9901 pipe.
Remove fuel tank from vehicle. Pressure test the tank in a soapy water solution (submerge tank). Place finger over fuel pickup, apply pressure by blowing on the pressure line. Observe results to see if any bubbles are seen escaping the tank. Any kind of air leak will cause tuning issues. , Ok I will do it
Run all fresh pressure/fuel lines on the car.
Replace all clutch shoes and ensure they are operating properly.
I will check all, but I dont have any issue with my other engine
The following statements are based on running the engine in a 1/8th buggy on a typical dirt-track in a racing environment...and the engine being broken in (at least 2-quarts of fuel or more).
6.5mm carb insert.
Place LSN 1/8th turn in from flush.
Place HSN 1/2 turn in from flush.
Set idle speed to have 0.50mm air gap (set with restrictor removed), or start the engine and adjust it accordingly once warmed up to operating temp on the starter box. (I'm betting it's way off).
Once running at operating temp, adjust the HSN until proper performance is achieved. With a head temp of 220F- 260F; the idle speed should be stable and fairly low.
Use 0.80mm total head shim stack. .30/.30/.20 for 30% nitro. I had 0,80mm, but the plugs become broken, but I will test again
Use 0.75mm for 25% or 0.70 for 20% Ok I will test, i used to run 25%
Use Novarossi C6TGC glowplug, or OD77T; or OD97T. C6TGC preferred; otherwise start with 77T.
I assume you meant 41029 manifold for Mugen? Yes
Pair with 9901 pipe.
Remove fuel tank from vehicle. Pressure test the tank in a soapy water solution (submerge tank). Place finger over fuel pickup, apply pressure by blowing on the pressure line. Observe results to see if any bubbles are seen escaping the tank. Any kind of air leak will cause tuning issues. , Ok I will do it
Run all fresh pressure/fuel lines on the car.
Replace all clutch shoes and ensure they are operating properly.
I will check all, but I dont have any issue with my other engine
The following statements are based on running the engine in a 1/8th buggy on a typical dirt-track in a racing environment...and the engine being broken in (at least 2-quarts of fuel or more).
6.5mm carb insert.
Place LSN 1/8th turn in from flush.
Place HSN 1/2 turn in from flush.
Set idle speed to have 0.50mm air gap (set with restrictor removed), or start the engine and adjust it accordingly once warmed up to operating temp on the starter box. (I'm betting it's way off).
Once running at operating temp, adjust the HSN until proper performance is achieved. With a head temp of 220F- 260F; the idle speed should be stable and fairly low.
Use 0.80mm total head shim stack. .30/.30/.20 for 30% nitro. I had 0,80mm, but the plugs become broken, but I will test again
Use 0.75mm for 25% or 0.70 for 20% Ok I will test, i used to run 25%
Use Novarossi C6TGC glowplug, or OD77T; or OD97T. C6TGC preferred; otherwise start with 77T.
I assume you meant 41029 manifold for Mugen? Yes
Pair with 9901 pipe.
Remove fuel tank from vehicle. Pressure test the tank in a soapy water solution (submerge tank). Place finger over fuel pickup, apply pressure by blowing on the pressure line. Observe results to see if any bubbles are seen escaping the tank. Any kind of air leak will cause tuning issues. , Ok I will do it
Run all fresh pressure/fuel lines on the car.
Replace all clutch shoes and ensure they are operating properly.
I will check all, but I dont have any issue with my other engine
Another test will be the short manifold for mugen
Last edited by Arushmen; 09-20-2011 at 06:25 AM. Reason: lipo
#1499
I've run the Werks setup with two different spring setups; both work very well. The Werks clutch comes with 4-aluminum shoes and killer strong springs installed right out of the bag. If that's how youre using it on a Buggy, it's not going to work as nice as it should.
I'm running the "medium" flywheel.
2-carbon
2-aluminum
I've run it with all greens springs (which I think are 1.0mm, I forget). This is a good, soft setup that is fine for most tracks, some may not like it because it's not very "punchy" in the bottom end, but it doesn't spin either, which helps with mileage, tire wear, etc. I run on a tight, short, slick track and I make all our jumps with ease. No need for a looser clutch really.
The other setup I used was Carbon/Green; Aluminum/Silver (1.1mm I think) This setup was slightly looser and had a bit more punch, but once I put a couple runs on it, it seemed a bit too loose for my liking.
I'm running it on an MP9 and was trying to replicate the feel of the Losi clutch. (Carbon/black; Aluminum/Green, heavy flywheel).
It's pretty close but not quite as nice. But much better than a 3 shoe.
I would not recommend running all aluminum shoes in a buggy with the Werks clutch. Truggy, ok, but not in buggy.
If you're preheating with a heat gun, ensure that the engine block has had time to saturate/get hot. I'm not saying this is the case for you, but I've seen guys that get the head "hot" and read a flash-temp but the block hasn't saturated, thus it isn't really preheated/hot enough to crank easily.
#1500
Arushmen: If you're actually breaking glowplugs, you have other issues.
It can be caused by any of the following:
(a) you're hydrolocking the engine during startup (too rich)
(b) leaving the glow ignitor on the plug for a long time without the engine running, thus weakening it/burning it up prematurely
(c) the engine isn't broken in and/or is improperly tuned and you're busting them at high RPM.
And to clarify the shimming figures I gave you, they're based on using a Nova C6TGC plug. This is based on being 1,000 feet or less above sea level. Higher elevations you'll have to adjust down accordingly.
All fuels are different too. Most modern race fuels are low oil content.
For 25/11 fuel (Byrons) run .70 shim
For 25/9 run .75
For 30/11 you can run .75 or .80
For 30/9 run .80
It can be caused by any of the following:
(a) you're hydrolocking the engine during startup (too rich)
(b) leaving the glow ignitor on the plug for a long time without the engine running, thus weakening it/burning it up prematurely
(c) the engine isn't broken in and/or is improperly tuned and you're busting them at high RPM.
And to clarify the shimming figures I gave you, they're based on using a Nova C6TGC plug. This is based on being 1,000 feet or less above sea level. Higher elevations you'll have to adjust down accordingly.
All fuels are different too. Most modern race fuels are low oil content.
For 25/11 fuel (Byrons) run .70 shim
For 25/9 run .75
For 30/11 you can run .75 or .80
For 30/9 run .80



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