I agree, but until they do you can do it yourself with a 2 part metal/epoxy glue, i've used the plasticine like type mentioned and it works great.

http://www.rctech.net/forum/onroad-n...huast-tip.html

Manifold
 

Hi, Will the 41005 header make the most power on the .25 and .28 engines?
Thanks

Can someone z help the plus 4 t is the white carb restrictor
6 mm thanks

Yes it is :)

http://www.amainhobbies.com/product_...buretor-Insert

thanks Lille-bror appreciate that

No worries :)

BTW: If you REALLY want's to show your appreciation, you can send me 50 bucks!



JUST KIDDING :-D

I've been a firm believer in small venturies. Sometimes I need more power in the slower parts of tracks (so you don't have to use WOT to clear small jumps etc.). So from now on, I'll change to bigger inserts, if I haven't got enough acceleration. The mileage shouldn't be worse and you'll have extra power when you need it.

:D

Hi, I know that venturi measure do you recommend for the Roma, 6 or 5.4mm?

Thanks. Best Regards.

I did a search 1st and did not find anything on the +4 Keep-Off, other than the rear bearing post.

Walked into the hobby shop and everyone was tweaking on it, sooooo it came home with me.

Been doing P5's and keep seeing the +4's, BTTA or BTTS's and saw a Mugen version with weekend.

My boy (who run's +4 Tuned) has pretty much stop speaking to me since buying this motor. Anything I need to know about this motor? Do's/Don't's.

Hi Guys, Do any of you select your glow plug based on air temps as per the nova temp chart? Reason being, I had a flame out which cost me 4 places when my gut feeling said change from C6 to C7 due to high ambient temps. After the race, i spoke to a few guys who also run Nova and one said they never select plug based on air temps and he would have run the C5 in the hot conditions. The air temp was around 28 deg C so borderline on C6/C7 plug. The guy who ran C5 had a few flames himself... any advise?

R u in Australia, I'm in Brisbane And I tried the 5 in hotter conditions, but waited tilling was about 38 deg and felt it wasn't an improvement. I will be staying with the 6 plug probably all year round.

I only change to a colder plug, if the engine can idle for a minute or so and then take the throttle without farts and burbs.
Colder plug = a little leaner setting and better mileage

anyone want an ebmods powerplate for the novarossi 26mm bonito/keep off 7 port/ext.. bearing engines? I got one but did not realize it will not fit my beat 21-4bt. I put it on ebay item #111018876639 but make me an offer if interested.

thanks

The 7...:nod:

The 7mm? Not very big?

I have found that on the older carbs, and most track conditions the 7 is the ticket. If it is a a high traction track and fuel mileage isn't an issue the 7.5 is good

I have a P5 XLT with 1 gallon through it. It was broken correctly and I am running a turbo #5 in it. It ran great all though break in and ran great though its first race weekend but then I started to have issues. I believe I have a air leak somewhere because at times it will run strong but all of a sudden it will bog and flame out. I have replaced the fuel tank and fuel lines and I also have replaced the exhaust gaskets. Is it possible that the front bearing has gone bad? There is a little moisture around the bearing but nothing crazy. I went ahead a bought a #17011 bearing to replace it with. Are there any other things I could check? Like I said its a almost new motor and ran great up until this past weekend. Any help would be great. Thanks

Just watch for the lip on the inner race. You might already know but I wanted to warm you to be careful installing it.

sooooo many times i see where the high speed needle inlet gets a small particle stuck in there and it will wreak havoc on fuel supply

take out hsn , flush system and reset needle to 4 turns out from all the way in , if that doesnt help then yes i would guess either a) front bearing or b) tank/lines (fuel supply)


tip: before you ever hook up your lines , flush out complete fuel system from blowing on the pressure line and having the line that connects to the carb inlet either off to the side or even easier laying in a rag so it doesnt spill everywhere


novarossi carbs have a very fine passage way for fuel to enter through the hsn housing

I have a Plus 4BTT that's seems to always want to run hot and am not sure why ? It wants to always run at 275 with not even a race tune on it yet and too me that seems a bit hot ?

It has about 0.8 gallons through it now. Its been rebuilt with a new piston/sleeve/rod and bearings. Changed the carb out with another Novarossi one i had and still the same result.

Car is new MBX7 and drive train spins free as can be. Its also been made light at 3240g so its not like the engine is having to work hard to push it.

Engine has lost its metal pinch at TDC also. No air leaks in the fuel system.

I just don't know what it could be. Its blowing a nice thick smoke trail all the way from bottom to top end..... ?

Any ideas ? If i try to really race tune it it just gets even hotter pushing 300. But if i ritchen it i loose top end and power and run time.

Those temps are not unheard of on the new low cooling head design.

Can you get more airlfow over the head ? or thru the head ? these new low profile Nova's tend to get buried under the body and not get proper airflow thru them..... These are air cooled engines and they will run hot if you don't have proper airflow ....Low profile heads tend to not get as much airflow and will run hotter....... Increase the airflow and you should see a reduction in temperature....

Monty, how good is fuel economy on the Nova Roma .25? In Truggy.

For the time i ran one i noticed pretty good runtimes (9 1/2 ish) during break in wigh 9853ss/41021

That isn't to bad, considering not broken in totally. Its a beast too, isn't it?

its a hell of a motor.... 9 minutes i got with it i came in with fuel in the lines only.. LOL.. running 2096/021 on D8T

Lots of power? How does it compare to a Bonito?

i can drive my truggy with the bonito.. and cant with the Roma..

Thanks

Ok here are some pics of how it looks with body on. I have cut out a fair bit round the engine head. Cant do much with the hole in the front window as it is. The top of the head as you can see sits just about level with the roof of the body so there is not much air flow through the top.

p5xlt or 4btt
 

looking to buy a new engine and have decided on these two but would like to know which one is better for a buggy

thanks
andrew

btt.......

You need to understand the dynamics of each engine and THEN make up your mind. Both are very good in buggy. BTT has a smoother power delivery while P5 has more low end pop. Just depends what characteristics you want from your engine.

Can anyone tell me the Btta rear bearing size?

thanks

14x25.8x6mm

dang monty, give me 10 seconds to refresh the page :lol:

i was already in the offroad forum zane

lmao, not bad sir!
also, you coming to the nats warm up?

Sorry for being a noob but different venturi sizes are just for more power?

JJ

think of it as tuning the cfm displacement on a real carb of sorts

a properly jetted engine is most efficient and powerful at the same time

highly recommend the 8mm during first gallon then 7mm from there on out :nod: