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4 stroke thumper in tmaxx

4 stroke thumper in tmaxx

Old 08-05-2003, 07:32 PM
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Default 4 stroke thumper in tmaxx

i have a old tmaxx from when they first came out so its got the old .15 motor and narrow suspension. i was looking into getting a new motor for it and wanted something differnt, what better than a 4 stroke.

besides the mags who have built them has anyone else had any luck in putting a 4 stroke in a maxx?
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Old 08-08-2003, 10:03 PM
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A 4 stroke conversion is a pretty large undertaking. You'll probably have to get a longer chassis even if your using a .26. not to mention they have strange crankshaft dimensions or something.

I would suggest putting a .15 CV-R in there and adding the traxxas 2.5 suspension kit. Not the pro-line one, I've got it and the parts are really really flexible, and they look kinda funny too.

CV-R's are awsome!, btw.
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Old 08-08-2003, 10:12 PM
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im mechanicaly inclined so i can do the install

as far as the suspension this is what i was thinking-
1)pro line maxx susp. (or traxx's if they sell a kit?)

2)big bore shocks or losi truck shocks unless someone else has any ideas?

3) mip cvds

4) new tires maby pro line 40 series?

5) and a longer chassie

i have the 2 mags that did the install so i have a basic idea of what i need the only probl is the gearing. dont know i was just tossing around the idea and wanted to get some feed back, money wont be an issue ill just do one thing at a time so the maxx wont be transformed over night. i got the maxx to just to bash on the days i cant get to the track and race my xxxt.
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Old 08-08-2003, 10:18 PM
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I've never run big joes, but I've seen a maxx running them, and it wasn't to pretty. They are so heavy when the truck is in the air a tiny bit of throttle will nearly flip the truck over. And the extra weight puts more strain on the suspension parts. Plus in my opinion they look really horrible in person. Pro-line does make some nice "normal" sized maxx tires.

Big bores and Losi shocks are both good, but so far my stock plastic shocks have worked very well.

Thats my input for now!
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Old 08-08-2003, 10:20 PM
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cool thanks

if i do get the 4 stroke ill be sure to post some pics.
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Old 08-09-2003, 10:18 AM
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.26 Converstion Here is a kit for the .26 four stroke motor in the tmaxx.

.40 kit Heres a .40 kit
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Old 08-09-2003, 05:34 PM
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i hate posting links but in this case it helps on rcrevolution.com they have a 4 stroke forum that was based off of the old four stroke forum from maxxtraxx.

me having installed and ran and built a fourstroke maxx i can give you some advice

first its a pretty big undertaken that gonna cost a bit to finish

you can buy 4 stroke engine mounts and mount them to an extended chassis or buy the kits as posted. you will need to have a much lower gear ratio to compensate for the lack of rpm from the fourstroke. and also having to adjust and deal with the 2 speed

if you are going to do a thumper get the .40 works a whole lot better but even the .26 could pull 200 pounds on a skate board with a 66/20 gearing the only reason it couldnt pull more was because of the slipper melting. .....


also figure out some way to get a little more cooling out of it by installing a fan or something like that.

check out that fourm on rcrev they have a few guys on there helping out alot.
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Old 08-09-2003, 05:39 PM
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i know its going to cost a lot to do it and i realy got the tmaxx just to bash, so i dont know how quick ill get it done.

my main question is how was the performance of the motor in the truck aside from pulling 200 lbs

is it fast?

how hard is it to tune the motor?
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Old 08-10-2003, 03:41 PM
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tunning it was a lil tricky, it being a 4-stroke and all. i ran the new era extended chassis and that 20/66 gearing it wouldnt pull wheelies but it would accelerate pretty hard. it topped out a lil faster than a stock maxx and just seemed to jave alot of bottom and mid range power
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Old 08-10-2003, 11:27 PM
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when you say stock tmaxx did you have the 2.5 motor or the orig. 15?
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Old 08-11-2003, 12:18 AM
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Tuning is easy. Simple OS carb and only single needle.

A 4 stroke is not necessarily going to be jaw dropping fast or anything. What it does have is a bunch of torque, good fuel economy and the uniqueness of owning a 4 stroke.

If I had a T-Maxx, I'd go with a .40. (I run a .26 on my FW04)

Oh yeah, almost forgot, you "may" need some sort of cooling fan. I'm not sure how bad it will be without one though.
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Old 08-12-2003, 02:02 AM
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original .15
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Old 08-12-2003, 11:24 PM
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4 stroke kewl!!!
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Old 09-19-2005, 04:47 AM
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as far as ive heard around 22/66 gearing is a good starting point. with any project there is always going to be alot of trial and error.
good luck.
p.s keep me informed on your progress would love 2 here how you go.
cheers
matt
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