2.5R motor

[dgcooper]

Any one dropped in a 2.5R motor. Just picked one up. Havent put it in yet, will in make a big difference?

[GASSHEAD]

not really the only difference is a 60 doller cooling head.

[Efox575]

I think the piston, sleeve and head are diffrent I heard that it should make some diffrence

[cholyoake]

apperently the piston and sleeve are the same in the 2.5 and the 2.5r.

[arceeguy]

As stated, the only difference is the cooling head. At one time, there was a slight difference in porting, but instead of having to produce two different parts, they are just tossing the "R" parts in "regular" engines now.

If you send in a toasted 2.5 via the engine replacement plan, Traxxas will send back a 2.5R - with the fancy $60 head.