how heavy can my frame be??

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DirtyDamage

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Now I haven't read all the comments, as im hard on time right now but look at it from a different perspective. Instead of worrying about the total weight, build it how you'd like and then consider the total weight and look for an engine/tranny combo that would conform to the needs. Now of course a picture would help me and others understand exactly what this is going to be like, but probably nothing too extreme if your original plan was to use a Pred in the first place. Now you can always source a snowmobile engine pretty cheap, depending on location of course, if ones not available can always use a old dirtbike or motorcycle engine as well, look at Upap for good deals!

I'm also inferring this is going to be used off road as you claim it's going to have a roll cage, so perhaps the use of an actual transmission and the availability of a legitimate first gear would be beneficial. But then again you have to account for budget as well.

Now, ignoring that, if you want to stick to a pred, it's not just a question about how powerful the engine is, but also what gearing you're looking to run. Gearing can and is essential to get right for a productive and usable cart. You can always gear it to go 5mph and climb like no other, or you can gear for it to go 30mph but probably not climb as well due to the limitations on power. If you don't know what you want, you can always get a split sprocket and hub to mess with gearing -- unless you're getting a torque converter.
 

chancer

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Guys guys guys. You're flooding the guy with a theory about composites. Just tell him how to build a normal DIY go kart!

He started it!
Anyway that is cool info. and all the facts were given.
Like the 40x cost. $$$ meaning a 200 dollar frame would now be $8000.00 USD carbon fibre!
 

OzFab

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He started it!

The OP didn't start it, Damian Laffrey did; a whole page wasted bickering over a pointless process which would add unnecessary weight & cost to the project...

We here at DIY go karts are avid believers in the KISS method, KEEP IT STUPID SIMPLE! No useless, heavy reinforcing, just a basic frame using the correct material & you're good to go...

The most important thing to remember is it's better to use larger thin wall tube than smaller thick wall tube; ie: 1.5" tube with 1/16" WT is preferable over 1" tube with 1/8" WT...
 
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