Hey there CEN MT2 fans. I would like some help in properly tuning my Fun Factor MT nitro trucks. I have tuned my engines many times before, but, lately, they are not running right. I have double checked the engine manual, but, I must be missing something. Hopefully someone out there can help me. Here are the fact. I own 2 CEN MTs. Both have the same factory NT-16 installed engine. Both have the same engine settings, and both seem to be running very sluggish. The HSN's are set for 3.5 turns out and the LSNs are set at 1/2 turn in from flush, or 2.5 turns out. The Idle Screw is set for 1.5mm open. Does anyone else have some suggestions? Both CENs seem to ide very well, but, I do notice that both seem to have lots of fuel/vapor coming out of the exhaust. So I think that Im running them too rich on the LSN? If I turn in the LSN more, then the engine will run about 250 to 270 degrees. The manual says the recommended engine temp for the NT-16 is 220 degrees. Can anyone tell me if this is correct? or is the 220 degrees juse during the break in period. Also, if anyone can give me the LSN proper setting in turns, say 2.5 or 3 turns out, that would be helpful. Saying that the LSN should be flush with the control arm, is a bit vague. Im from Los Angeles and usually running my CENs in 75 to 80 degree weather. I would like to know the best recommended HSN and LSN settings. I would love to hear any and all suggestions provided. Thanks.

flush on the low speed needle is best to get that snap off the line... I have run my nt-16 in the 270-280 range all the time.. I think 220 is too rich... you say it ran better in the 270 range so put it back there.. you may have to adjust the hsn after the lsp to control the temp...

Hey. Thanks for the reply back. Yes, my CENs were running better at 250 to 270 range, then I double checked the NT16 manual. Said that recommended temp was 220. Probably during the break in period? I will try keeping my LSN at flush and increase the HSN slightly, until I get back to where I was, running around 250 to 270 range. Just for the sake of total understanding, can you tell me how many turns from closed, is flush for the LSN. I have it noted as 3 turns out to flush. A few people have recommended going 2.5 turns out on the LSN for an extra snap or fast on the line. Since both my NT16 engines are well broken in, what would you recommend for the HSN setting? I have mine set a 3.25 to 3.5 turns out, depending on the oustide weather. Should I go 4 turns out on the HSN to keep the engine cool? or is that running too rich. Also, just a last quick question. About the exhaust. Is it normal to see a constant fuel/vapor type exhaust coming out. Its not flooding out, but it is a regular mist/fuel vapor. should the exhaust be just the normal blue smoke trail, or is a moist fuel exhaust considered normal. Hey, Thanks a million. I cant wait to get home after work, and re-adjust my CEN's...

I just kept it flush with the LSN and adjust HSN accordingly.... Mine always had some junk comming out of the exhaust when running.. I now run an OS .18 cvrx and its much easieer to deal with besides more power.. I still have my nt-16 but it was getting old...about 4 gallons at least thru it..

Thanks Again for the info. I will adjust my CENs tonight. I actually own 3 CENs. My other MT2 has the EPIC .18 Big Bore engine and it totally rocks... I did not mention it before because I was asking about NT16 engine issues. I never have any problems with my Epic .18 so I figured that I was doing something wrong when setting the NT16s. I will let you know how they run after making the proper adjustments.....

I was going to get the epic .18 but changed my mind at the last minute and put in the OS.... I have quite a few trucks and I don't have the time to jerk around with quirky engines... I have an hpi .21 in one of my trucks and that thing is a bear to tune... the OS seems to hold a tune forever and I have a few of them in various trucks....

Hey, Thats Cool. I have not had any problems with my Epic .18. I am curious to know, what issues were you having? I have never tried an OS engine. Does the OS .18 directly bolt onto the CEN MT2s, just like the Epic? I would consider buying one. Sounds like your just as hooked into nitro trucks as I am. To be honest, I have 15 vehicles acquired since I began this hobby a year ago. I like CEN MT2s, XTM Mammoths, HPI MT2s, Traxxax Emaxx, For the quick RC fix at night when noise can be an issue with the neighbors, and just got my new Jato last week. I dont deal with pull starters though. Ive put either a roto start or the tiger drives onto the nitro trucks. I dont like playing the, "lets pull start the engine," game. What other trucks do you recommend? I have always wanted to get one of those Schumacher 3-speed deals, or I have heard some good things about XTM's new XLB 1/7th scale buggy. Thanks again for the info. I would like to hear about your opinions in regards to the Epic .18 vs the OS .18. OS is easier to tune? Sounds good to me.

Hey Cen Racer 1, I was checking out the OS .18 engine at tower hobbies. I could always use a spare engine anyhow. The OS .18 CV-R looks like a great engine. Its a direct fit as well, right? I noticed that OS makes 2 versions of this motor. Can you tell me the different from the CV-R and the CV-RX.. ? Anything beside the specs that I read, where the CV-R puts out 1.35hp @ 30,000rpm's and the the CV-RX puts out the same HP @ 28,000 rpm. The CV-R also has a max rpm's of 30,000, where the CV-RX rpm's max at 32,000. Heck, for the extra $10 dollars at Tower Hobbies, personally, I would go with the better RPM handling engine, so my choice would be the CV-RX. Which motor do you have? or is this the same motor, just a little beefier crankshaft or other internal parts on the CV-RX. Tower Hobbies sells the CV-R for $89 and the CV-RX for $99. Just curious to know if there is really any difference in these motors. Oh Yeah, It must be the pull starter :-)) Cause with the CV-RX you get a new pull starter, where the CV-R does not include it. Heck, I would end up using a Tiger Drive or Roto Start Adapter anyhow. I would end up selling the Pull Starter back on Ebay :-) to recover some $$. Hey Man, Thanks again for all the good feedback. You have been very helpful.....

I got the cvrx and the pull starter is the only difference... They are direct fit and I had no mods except to cut one exhaust stud... everything else was direct fit... I will tell you this... My engine starts EVERY time on 1 light pull....... roto start is a waste of time with a properly tuned engine....... I got mine from tower for $99.00 with some rebates... incredible deal... everyone else charges 160 to 180.

I got my CV-RX for $85 off EBAY!! Now thats a bargain....will run it in very soon....

get some pics on here!

I'm working on the pics... I've been very busy at the car dealership selling the Dodge, Chrysler and Jeeps.... At least I sell cars that people want!!!!! The new chargers are wild.... I will post pics maybe this weekend...

i had a little run in a bmw m6 the other day at work - traction control would appear to be there for a reason... couldnt understand that meself...

what happened

thats what i said... 500hp deserves a little more respect apparenty

that sounds like some of the stuff I pulled with a viper last summer.... forgot what 500 hp and 500 torque will do to the tires even at 50 mph... almost spent $85000 on that one...

Hey Everyone. Thanks to all who replied. I finally got the MT2 running good. Basically Im running it 3 turns out on the LSN and 3.25 turns out on the HSN. Works like a champ. For those who need the number of turns to make it flush on the LSN, just as I preferred, its 2.5 to 3 turns out on the LSN. The Idle Screw should be set around 1.5mm out of closed on the carburetor opening. It was recommended that I try the OS .18 CV-RX Engine, so I bought one for my other CEN MT2. I will spend the weekend braking it in properly. Even from opening it from the box, I love this engine. A much larger blue heatsink to help keep the engine cool. Much better than the factory NT .16 engine. Does anyone know of a larger aftermarket finned heatsing for the factory installed CEN MT2 engine? Thanks again to all..

CEN has a larger aluminum head that you can use. But it can over cool the motor and cause tuning problems. It was primarily designed for racing where a motor is running wide open for an extended period of time.



rolland

Thanks Rolland. I usually run my MT2 pretty hard anyhow. I run mine at the local high school so I have lots of straight away room for really opening up the engine. What aluminum head should I be looking for? Do you possibly have a part number? Thanks again, [sm=thumbup.gif]

Part No. G70345