selena1718

hi i am thinking about getting a os 18 tm engine for my 3.3 revo is it faster than the 3.3 and is it easier to tune also is it a direct fit in the revo can i still use the easy start or maybe the os .21 any help would be appreciated thanks.

Danju

im not an owner of a 18tm (soon to be) but heres what everyone says: its direct fit, it can use traxxas EZ start and PS, easy to tune (come on its OS), and it has just a tiny bit more power than the TRX 3.3. people say it has a "different power curve than the 3.3"..(whatever that means)

weez440

i have the os and never owned a 3.3 and i can voucher that it is a direct drop in and from what i heard they are really close on top end but on bottom end the os has a lil more grunt. and of corse the easy tuneability. i think traxxas should just start selling rolling chassis so we can put our own motors in.

atownspy

yes. other than what is already said, the os 18 has better low end but a little less top end compared to the 3.3. and another thing is that os engines are built very well.

DaveG55

A different power curve means just what people are saying.
The 3.3 makes a bit more power near the upper end of it's rpm range, The TM is stronger in the lower rpm range.
If you were to plot on a graph the power at specific rpm's for each engine then those plottings would produce a curve shape. Since the two engines produce different amounts of power at the different rpm test points the power curve for each will be different.

For MT's it's better overall to have a strong low end because then you can get a good strong take off and still gear the engine to have a decent top end. Where an engine that makes it's power up high will be weaker on take-off but can be geared to go faster. That's what makes the TM a great engine for MT's because they need the power to get them moving.

Don't expect the TM to be a big difference from what you're used to though.
If you want more power you will need to go up in engine displacement. The Picco Maxx .26 is a lot more powerful and almost a direct drop in as are the RB 323 & RB523 - all three use the ez-start but the Picco needs a new motor mount.

Danju

ok.thanks i get it now

crazzyrevo

Yoy should get the os21tm i have them for sale $260 us plus postage $15.00 us $275 in your hands.
It leaves the 18 tm for dead.

selena1718

thanks for all the info