Yes final measurement is .70mm, 03001 is .10mm and 03005 is .30mm. You can buy them at amainhobbies in packs of 5.:)

thanks maddog ! I went ahead and took them off my old P5 ! its 2 aluminum and 1 brass ! Thanks

Wow a 4.7mm venturi, that would be fun to tune.
http://www.novarossi.it/eng/news/read.php?newsid=191

engine damage regardless... Who needs lubrication when you have that kind of fuel eco. lets run 4mm worth of head shims, a short header and A fuel eco pipe. Heck we may only get a gallon of fuel and no power out of it but it will get 12 minutes. :D

if you ran the new carb with the 5.4 inserted you may think differently.. no power loss.. temps were the same.. but only a slight increase in runtimes.. nothing to warrant getting the new carb.. these inserts maybe only intended for the new carb.. which become standard on nova engines soon...

Guys whats the pipe combo for the p5 in a truggy. I don't need a lot of top end. I prefer bottom end....Thanks

9901 pipe/021 header

Or, 2096 pipe/ 41021 header , either one you can't go wrong. By the way, these are Nova Rossi pipe/header as are 9901/41021.

I really look forward to try one. An OS 5,5 are just great on a Nova with a significant powerloss. The tuning window are narrow but I really likes it, because you "easily" can hear, when the tuning has changed e.g. during a race day.

Many Danish drivers runs 7 mm in their RB and SH engines and gets +9 min of runtime - the same as I do with my Nova Plus 4 Team with 5,5 mm venturi.

I'm gonna try try both 4,7 and 7 mm venturies to see the difference :tire:

9853ss/41021 :nod:

roma
 

anyone got any feedback on the roma? what insert is working the best?
what runtimes are people getting and what pipe configuration are most running or is it to early to ask?
feedback on my roma is 9886/21 25% nitro 7mm insert with around 2 gallons /8ltrs on it #6 nova plug 14t bell ls needle just on flush hs needle just out from flush runtime about 8 mins temping about 250f making awesome power right thru comparing with a curret os speed the rpm sounds a little higher at the end of the straight I just changed to tko ceremics f/r all is working well
I might try the 6.5 insert to see any difference in RT and power not game to try the 5.4:eek:
cheers

I have a quick question. I just purchased a 21 4c. I am using houstons break in method (heat cycle method) and have just finish my three on the box heat cycles. I just did my first heat cycle 10 min run on the ground. I was having a hard time keeping the engine at 210. It would hover right around 230. 80 degrees ambient and humid. I tried to richen the low speed and lean the high. And vise versa. I cant keep it running if i try to run it richer. Loads up and dies. At 230 it is plenty rich. Tons of smoke and oil coming out the exhaust. I am just concerned that it is a little to hot. Am i being paranoid?

Yes.... You will be fine... Just don't run it blubbery rich...

hotter plug ;)

c5tgc or odonnell 97t for break in

I'm running the Roma with 6.5 Venturi, 48/14 in losi truggy. Am about to try a 15t bell. Don't think it will work at our track. Should be quite quick top end I reckon. Using 2069/21 30% nitro x fuel. 245-255 f and getting around 7.50 rt. needles are pretty much the same. About 6 l through it now.

Im having a bit of trouble breaking in my plus 4t. I preheated the engine fired it up it ran less than a minute then killed the glow plug. I put in another plug and the same thing happened.

My needle settings were set by the sheet that came with the engine. 5 turns out on the LSN and 3.5 out on the HSN.

Way to lean on the HSN. Should be a little past flush for break in, approx 5 to 5.5 turns out from closed. Thank the nitro gods your plugs blew. Once broken in the 3.5 turns out from full closed sounds lean to me. Think its closer to 4 turns for factory settings.

Yeah the runTime isn't the best I am about 8min on 25% 14tbell is the best I reckon I am nearly at 8 ltrs still happy with it in the truggy :nod:

I had a bit of dirt get in the front bearing after just 4 ltrs. Changed to 17011 and seems fine ATM. Did consider blocking vacuum return valve but decided that if it wasn't serving a purpose then novarossi probably wouldn't use it.

I have also used 1/10 tire foam around the head. works a treat to keep temps up

Thanks beidle. I richened up the HSN and put in a Werks 6 (only thing I had on hand) and things are going smoothly now.

I hate to be doing this but I recently picked up an Alpha sponsor and my roma 25 does me no good just sitting. Here is the link so lmk if anyone is interested.

http://www.rctech.net/forum/r-c-item...d-fs-only.html

no problems. Keep the temp between 190 and 210 for the first 8 or so tanks. The werks plug is fine to use. you could use a Od 97T for break in, but I don't trust them much past that. once I was broken in and on a race tune. switched back to Nova plugs. worth the extra $5 a plug. They make the engine run super smooth and will last a lot longer. DO NOT USE AN OS PLUG!

I'm getting a CRE Roma and I'm hoping I get 10 mins if not then I will enjoy the mill and pit early and fast:nod:

DO NOT USE AN OS PLUG!

just wondering why you say not to run the OS plugs?? thats all my LHS stocks, what should i run in my nitrotec r21?

The Nitrotec #6 plug.

Not made to fit the novarossi engines. The OS plugs don't seat correctly and could damage the nova head button.

let us know how you go with runtimes I will have a more accurate time next weekend as I have a big meet.

the os plug has a different taper and more than likely you will get a leak or stuff your head button, best to get the oddonnell 99t or 97t if nothing else available but the nova #6 is the best:nod:

Nova crank differences
 

Could Maximo or Houston please respond to this inquiry.

What is the physical difference in the 15009T and 15007T cranks? Timing? They look identical and use the same rear bearing size. They appear to be interchangeable with the naked eye.

What performance difference would you see using the 15007T over the 15009T?

Thanks!

Turbo head button
 

I've got a new Plus4 buggy engine, and want to swap to a turbo head button.

After looking at several engine specs, it looks like I can run the 28028 turbo head button with this engine? Will the stock Plus4 Buggy head fit on that button?

Or, what would be the proper turbo head button for the Plus4 Buggy and fit the stock head? 28002?

Thanks.

I'm a nitro newb, I just bought a 2 gallon
+.21-4c team, What Venturi should A newb be using?
It came with 5.5 through 8.0 in .5 increments? It had a 5.5 installed an I changed it to the 8.0, I just have no idea which I should be trying.
Thanks

Depends on track, driving style, and what kind of run times you need and want. I think (and use) the 6.5 as a good compromise

Thanks jnorwood, I'm just trying to tune the thing right now. It was way off but it's better now. So does putting a bigger Venturi lean it slightly since its adding more air?

Hi.

I actually tried to go from a 5,5 mm venturi to a 7,0 mm two days ago. I had to richen the HSN ½ to 3/4! You'll gain a lot more power with the bigger venturies :tire:

i.d. of the crank bore

Yes it will lean it, so compensate by richining the HSN

yes the NVR28002 will work:nod:

Monty, quick question. I went to the long header from the short. I wanted some more bottom end since the track is more tighter and smaller. Now, all factors the same except the header, which way can I expect to adjust my tune? Just wondering, so I can forsee adjusting my needles if necessary. Thanks.

Usually you will richen lsn

That makes perfect sense, thank you Monty.