I tried to revive my original cen mt-16 engine by upgrading to the .18 piston, sleeve and con rod.. I was under the impression that it was a direct fit, but I have no compression and when I finally got it started with a strarter box, It spit fuel everywhere.... Most of it coming out from under the head.... Do I need to get an .18 head with this... I thought it worked without it...
After a very frustrating 4 hours of bs , I put back the original and it started on first pull as usual and no leaks...
I think i'm just going to get the O.S. .18 cv... poor judgement.. which is the correct model? with rotary carb...I think I'll take your advice and finally get the engine...

its the OSMG2104 - www.osengines.com/engines/osmg2104.html altho i am using the slide carb version, doesnt make too much difference i guess, but the rotary is supposed to be more suited to offroad, and uses a slightly more straight forward linkage.

it drops straight in mate, u may need to shim ur pinions a bit tho.

seems odd that the cen 18 doesnt work right... i dont have any experience of the 18 conversion, maybe someone out there can shed a bit more light on it before u pay for the os...?

Check out the thread:

Cen MT2- NT-16 to 18 conversion results

According to that you should be sweet with the stock head, but its worth a read maybe.

I think doesn't work right is an understatement.... this may work if the engine is brand new but most certainly not with a well worn one... The stock head won't seal correctly no matter which way I place it... I was working on this with my racing friend and between us we have 30 years of nitro experience...
Basiclly, I wasted about $40us on parts which is no big deal.... I will take poor judgements advice and go with O.S.... ordering tonight and can't wait for the delivery....

u dont fancy testing a os21rgx in there do u? go on!! give it a go!!!

poor judgements... You know I love my mt2.... If I run that motor in the truck.. I will never be seen on the site again... I will bust up the truck so bad, I will throw it away... I have several .21 motors that don't even have a home and not once did I consider putting them into the truck... Its stupid fast with the .16... I'm hoping a bit more from the O.S. .18... I don't need to be doing back flips... I have a highly modified Electric Rustler for the thrills... Sorry, can't be the test dummy this time around... Besides, you know the truck can't handle the engine without major changes... I'm still trying to figure out the guy with the .28.... must have stock in cen and gets parts cheap!!!!!!

lol - yea the 18 is enough.... i guess. im tempted to try the 21 tho. i got away with putting all the os 18s power thru 2 wheels, so if i keep it in 4wd the driveshafts at least will be ok, as should the diffs. with the gen spurs i reckon it might be a goer - what do u think? pushin my luck or worth a shot?

how deep are your pockets?????? and you wanted me to try it first... mine isn't nearly as modded as yours.. and mines a monster truck with the huge tires... yours i think is a buggy... a fair bit lighter... If you are crazy enough, give it a go.. whats the worst that happens.. you break something....
wish me luck with the new OS engine... I cant wait... i am keeping the nt16 with original piston back in it.. I don't know what to do with the .18 piston, sleeve and con rod...

my pockets are looking for a decent tax return, i need to spend it before the missus finds somethin to spend it on! i was only teasing with the 21 mate... although auto2 from the "old" wildhobbies forum did fit one to a mt2 and only blew diff cups. with the cup mod i would expect the shafts to be next. he had standard diffs tho...

buggy? i have the tmaxx wheels on mine... u must be thinkin of mine with the rally suspension setup? its silly fast like that with the 18, the tmaxx wheels do slightly overgear it for the 18, not much, but it is there...

enough of my ramblings... get that os motor in there! im sure u wont have any probs with it, maybe a twisted driveshaft here and there on high traction surfaces - thats all mate, so yea, best of luck with it - especially if there is a tmaxx about, the owners faces are a picture after they have been laughin at ur cen...

my racing buddy has a highly modified t-maxx with an italian .21... claimes around 3hp or something like that... So far all the truck does with that combo is around 45mph... I was expecting more... it will pull the fronts but not too good... He just picked up the genesis and completed break in... I am impressed to say the least... Its a beast!!!!! still running rich.... I want one... I don't know what all the complaints were about... this is veery solid... tons of power and not even tuned for it yet.. pulls wheelies on command... shifts into 2nd no problem.. haven't adjusted for third as its a bit unstable at fast speeds in the parking lot... really doesn't even need third gear IMO... steering servo is the only upgrade it really needs..

what? a happy genesis owner? lol glad to hear it. i hope cen have got the early bugs ironed out, and ur mate has got one from the latest batch there.

yea u will kick his tmaxx tattooed ass mate... i hope![X(]

Do you have the head gasket in place? It has to have one to seal properly and make sure that it is not damaged. I also recomend using a small amount of silicone sealer on the shim just to help with the sealing and while you are messing around with the sealer, seal up the carb and backplate.
I have done the .18 conversion and it works just fine. I ran aproximatley 7 gallons of fuel through the stock motor with no after run procedures so it was definetly worn out.



rolland

I called cen and spoke with mike, he told me I would need the .18 head to ensure a tight fit.... i left whatever head gaskets were in place from the nt16 in place... I don't know if its bent or not.. doesn't matter anyway as my os engine arrived today... won't get a chance to do much until next week as I hve to go to Boston for the weekend... Girlfriends family stuff..... I will not give up on the cen engine, I'll get a new gasket and try it.. maybe i'll compare the 2...

I am not using the .18 head and am having no problems, but I also used a little bit of copper silicone sealant on the head shim and on the underside of the sleeve. On the old Wildhobbies forum their also was a few people that did the .18 conversion and are using the stock head with no sealing problems.
A comparison would be great. The O.S. engine will have more top end but I am not sure about torque.


rolland

I took my head apart last night and I don't have a copper gasket..... I don't ever recall seeing one there... that would explain the lack of compression... I'll call cen and see if I can get one sent to me...

well... got back from boston and had time to install the os 18 cvr into the truck before bed... took less than 30 minutes from start to finish... talk about drop in... only changes were linkage adjustments and longer fuel tubing due to the input nipple having to face the rear because of the header pipe... the clutch and bell fit perfectly and NO shimming was needed... I'm not crazy about the HUGE air cleaner and will get a motorsavor to fit.. will try and fire first tank this evening if no rain... can't wait...