Surely any kind of resistance in the pressure line will cause all the exhaust gasses to leave through the exit on the pipe, since there are only two outlets for the the gas pressure, the pressure line and the pipe outlet. Has anyone tried restricting the output on the exhaust pipe, causing more of the pressure be forced into the fuel tank?

I think you'd be screwing up the dynamics of the pipe design and that would not be benificial at all.

Any Additional restrictions to exhaust gas exiting the pipe to create more pressure to the tank would cause the motor undue restrictions to the air thru the engine and reduce performance. I am waiting on some parts try a few things to solve this problem. After much deliberation I think the problem could be cured with a simple check valve.

good idea [sm=idea.gif].

problem i had with Just the check valve, is after a bit of time, the engine would rich bog due to overpressureizing the tank. the extra pressure will do one of 2 things, either eventually pop the lid, or like i had happen, it would flood the engine. thats why i say you ll need both the check valve AND the relief valve. check it out, typically with these engines you ll get max 12 lbs of pressure in the tank. MOST common is about 8, pretty much as hard as you can blow into the pressure line. you start putting more pressure behind a fluid, that fliud will flow faster, and be pushed thru smaller areas at more volume, thus flooding these nitro engines. i could nt find a releife vavle small enough 3 months ago when i was tring to get one, so i set the project aside and started playing with the plane and heli, and now got the Baja. so the projects shelfed prolly till fall, or really crappy weather times... if you can find a small relief valve and set it to release pressre over 8.5 to 10 lbs. life would be fine as long as your fuel system is air tight. like thats a big change for nitro.
Timmahh

i found a check valve that dosent have a tight fit( lets the pressure out if theirs too much, i hope). tower sells 2 kinds one for glow and one for gas, the one for gas it says its not as solid as the glow and will let the pressure back out, how well it works i dont know but its worth a shot. i just dont want to canabalize another tank. but i think the in tank filter is the cause. when i removed it the brass pipe went all the way to the bottom of the filter and when i lifted it about 1/8 inch you could blow through it with no restrictions. i think cen should rethink the in tank filter and not use it and let the purchaser decide on an inline filter to use.

You guys should go to the glow airplane engine forum and search for pump and/or regulator. [link=http://www.rcuniverse.com/forum/forumid_114/tt.htm]http://www.rcuniverse.com/forum/forumid_114/tt.htm[/link]

I had problems with my 4-stroke dying after rolling and abrupt stops. I learned a ton of info from the plane guys. There are pumps and regulators available.

I started out trying the Cline regulator [link=http://www.billsroom.com/pcfs/]http://www.billsroom.com/pcfs/[/link] which is a one-way valve in the pressure line from the muffler to the tank and a pressure regulator to the carb. I had problems with it, maybe it was the spring loaded stopper on the tank or the size of the engine but I could not get enough fuel. It would probably work with the stock engine.

I actually have an electric fuel pump from a RC jet company now. It pumps from the tank and back to the tank with a tee in the line to the Cline regulator. The regulator now get a constant low pressure supply of fuel no matter what G-forces the truck sees. I don't have the pump info now but it is tiny and very low current at the approx 1.5 volts I'm running it at.

I also made a fuel bladder tank using an airplane tank and a plastic bag. It seams to be working very well and will keep running upside down while I leisurely walk over to get it

I can take some pics and get the pump info if anyone is interested.

Genesis Twin-- I would be interested in pics and info on that pump. Any idea or solution is worth a look.

OK, Here is the pump website: [link=http://shopping.netsuite.com/flightworks?whence=]www.flightworksinc.com[/link]
I got the 100-A. It's not exactly cheap. Sorry no pics yet.

So CEN doesnt actually visit this forum? I see they posted in the general MT section about the GST, but looked past the support issues. From the looks of this thread, quite a few people have this problem. I thought CEN was better than this.

SO, did anyone get this solved?

I found this and was wondering if it would help at all or if it's just garbage. It's not quite the same problem we seem to ahve... But could it help?

http://www.rbinnovations.com/catalog...products_id/48

Dustin, that is actually the valve I wanted to try, but I thought that was abit pricey for that valve, so I ordered acouple of the vavles mentioned earlier in this thread. However those valves require too much working pressure to be useful, so I am looking at this valve, it cheaper

[link=http://www.perrypumps.com/prod03.htm]VP-V2C check valve[/link]

Still working on it tho!!

Hi guys, I am having big trouble with my T-15 engine. My problem is that the engine is over heating to quickly and to suddenly, i have being every thing that the manual says i must do to prevent over heating but no matter what i do it creeps back at me, please tell me what i must do to stop this problem.

Hey Laurence. If the temps are constantly climbing, it may be time for a rebuild. I assume this is for the Magnum or Funfactor. Try setting the high and low needles back to factory settings. It should be running rich. Run it and retune the motor usind only 1/8 of a turn on the HSN at a time. Do high speed runs in between each adjustment. If still no good, you can seal the motor backplate and carb with a little high-temp sensor safe RTV sealant like you use on real automobiles. Just use a little and get a nice even coating. Too much will make a real mess. Also check your fuel line for air bubbles. You may have a leak in the fuel line or the fuel tank. Fuel line is really cheap, so if in doubt just replace it. Also, if you have an inline fuel filter make sure it is not sucking in air or leaking as that will effect your fuel flow. Next is the plug. Try going with a medium heat plug and see if that helps. But if you are still seeing the temps constantly climb and it is shutting down on you, it is most likely time for a rebuild.

Good luck and let us know how you make out with it.

I personally dont have any problem but just wondering. i am pretty sure the CEN factory guys were using the stock tank during races. I wonder what they do to the tank. someone asked them?

RC30GTR - We all run the stock tanks at the Silver State. With the new ROAR Rules though, 220cc is no longer legal at any race. So most of the CEN Racing team has switched to the spyder tank (which is 175cc rating, or the legal limit).


Everyone - Even with the larger tank, our drivers haven't reportd problems. We belive this is the case because they are advanced level r/c hobbyist. They understand the changing dynamics of nitro engines and that nitro powered ANYTHING will require constant vigilance if optimum performance is desired. Racing or bashing.

This is true with any manufacture.

Also our engine is unique in the car/truck industry. No one is even close to the .46 in size. It is more of a small airplane motor stuffed into a truck. So tuning this beast is different from anything else you will tune in a car or truck. Saying that your LST and Savage doesn't have the same problems is comparing an apple to an orange.

It takes patience to get things right. We recommend getting the engine warm first then begin to tune from a FULL TANK and get your temps around 220-230. Buy then end of the tank the temp will have risen to 250-260 and maximum power. I really don't see an issue with this.


CEN Racing.

that was well spoken i must say

Bravo CEN!! Couldn't have been stated better!! The Idea Of A Hobby is Having fun with it..no matter what your pleasure is!! ie. I really enjoy tinkering!!! But all of my tinkering is just to keep my fertile(Read Aging) mind occupied during slow moments.. I am thrilled to death to be able to Play like that...And CEN Manufactures Some Badass Toys For Us To Tinker With!!!!

I deffinently agree with CEN, and I would also like to say that my motor seems very easy to tune, and very powerfull. The one time I took it to the track, the guy at my lhs helped my get the tune perfect, we leaned to top end, and richened the cr*p out of the bottom end. It would run at 240, and it was a freakin rocket ship, all day long, through multiple tanks. Everyone at the track was amazed at the speed of the beast, and its ability to gobble up the whoops ( or whatever rc people call them, multiple jumps in a row) which gave everybody else heck, and the only thing holding it back was my cr*py driving. it has teken tons of abuse and liked it, I love my genesis.

Ok fellas, I've got it solved!!!! A check valve is the answer!! I tried several. I was about to give up when I ran across this filter primer setup for an Ofna!! I was skeptical but had to try. I mounted the filter and took it out for a tuning session. With alitttle leaning on the high speed side and less leaning on the low side, this thing no longer flames out at half tank. And it idles forever without heating up. Woot Woot!!!

Oh yeah cant forget the addition runtime...gotta get numbers for ya...

Sweet... dogman you rule!
ordering one right now. this tank thing has been my only issue with the gen.
btw, cool intake. notice any difference over stock?
or are you setting it up as a snorkle?

Thanks Dustin, the intake tube helps with the dust and dirt I get out here in the desert. When Running the stock air filter I was cleaning it after every run but as soon as I put in the snorkle/cold air tube and moved the filter forward, I can go several runs without worring about it..so long in fact sometimes I forget to clean it!!!!lol

Thats good to hear you have the problem under control Dogman. And thanks for posting it. Unfortunately i've pretty much given up on mine.

CENracing, i gotta tell ya, thats a funny reply. 3rd world countries? Now, if you could practice that line, and get an infomercial together, im willing to bet you could raise that 40k you need for the new mold. Think of all the Genesis owners you'd save, and all the CEN customers you might be able to save. For just a nickle a day.... LMAO... Isnt it Sally Struthers that does those infomercials? You could get Courtney Day to do one for ya. LOL.... That would be brilliant. But seriously now... You guys dont expect to fix issues with your vehicles, then dont expect a loyal fan base. Your CS is a total Joke. Im sorry to anyone here who is offended by me telling CEN this. Thanks to anyone who helped with replies. Except for the useless, yet entertaining reply from CEN customer service. lol. You make it all too easy to stay away from your products. Just when the GST almost lured me in with all that fancy green bling, i find this old reply. Thanks CEN, you've saved me alot of money!

No hard feelings, and Merry Christmas! I've got new toys to play with.

What a complete load of crap.. This is the absolute WORST customer "service" I have ever seen, and now know why you guys get trashed all over the forums! Would love to know how that meeting went.
"Hey, apparently we are having problems with our engines/fuel tanks." .... "NO!... Its all the new people to the hobby that don't have a clue what they are doing. Only our racers are experienced enough to figure them out. And that is good enough for me."

thats funny thermal.....coming from a guy like you who has 1 of everything monstr truck i d be more inclined to listen to your opinion than the other guys half assed remark.....i have a bud with a hobby shop and he got 7 of the genesis's when they hit the market a couple of years ago all but one came back to him with problems....not typical the customer is an idiot problems but real genuine problems with the trucks....cen did nothing for him or the customers..my buddy lost a few customers over that ...then 2 years ago at the rc show in chicago my buddy saw the owner of cen face to face and let him have it(verbaly)...if the .46 engine needs to be tuned like an airplane than it should be marketed to airplane guys not mt guys....nothing like selling an rtr that requires expertise in another field of the hobby.........mayby it should be sold as a training tool to teach lazy people to fix their stuff since from what ive seen this is all a cen is good for.........