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Discussion Starter · #1 ·
hey i can dream right.........??



do they use intercoolers, do they have to run race gas all the time??
 

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hey i can dream right.........??



do they use intercoolers, do they have to run race gas all the time??
I don't know much about turbos on ATVs, but I've seen the ones for the Rhinos and they are intercooled and designed to run on high octane pump gas.
 

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Discussion Starter · #3 ·
little turbos for Volvos at the junk yard are cheap, and an intercooler could be added in (safer/more power anyways)


93 oct would be doable. could also use the ricks timing guide and wire in a resister to reduce timing if needed.


idk, just kinda gets me thinking.
 

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Discussion Starter · #5 ·
you da man.

and NO WAY would i pay that price. dang some atv parts are more than car parts. im sure i could get the exhaust shop to weld/fab me up piping for less than 100. a few hundred for the intercooler and turbo, bov's are cheap (dont know if i really need one)



how strong do you think the factory rod is?? i see they offer a new/stronger rod with the 390 kits but not the 355's. bbk that is.
 

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I wouldn't pay that price either.

how strong do you think the factory rod is??
I don't really have any idea. I always stay stock and I've never broke a rod so I don't know.
 

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Discussion Starter · #7 ·
well yea, if you broke it stock, i might be looking for another machine......haha


for the price of it, it would probably make more power than bbk. i come from a supercharged car, and well boost is cool. something i wanna look into.





ON a side not tho, i noticed the fourtrax bbk kits goes up to 390 and the 300ex bbk goes up to 355 or so. pretty much you can bore the fourtrax out to more cc's. is it cause the fourtrax has more stroke??? if so, if i put a 300ex topend on it, that would raise my cc's then.

i need to find the website to compare the bbk.
 

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Discussion Starter · #8 ·
ah, yea after looking at it, to get 390 out of a 300ex you need a stroked crank (dont need that for the 300 fourtrax) SO im guessing if i get a 300ex topend, i need the piston also cause my 300 fourtrax piston is smaller, i guess?? if so, they bolt to the rod the same??
 

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SO im guessing if i get a 300ex topend, i need the piston also cause my 300 fourtrax piston is smaller, i guess?? if so, they bolt to the rod the same??
Yeah, if you use the 300EX jug and head, you would need the 300EX piston, because it has the valve reliefs cut into the top of the piston and the Fourtrax 300 piston doesn't.
 

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Bore and stroke is the same on a Fourtrax 300 and a 300EX. This is from the manuals.

Fourtrax 300 Bore and stroke = 74.0 x 65.5mm (2.91 x 2.58 in)

300EX Bore and stroke = 74.0 x 65.5mm (2.91 x 2.58 in)
 

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Discussion Starter · #12 ·
either way, i would need the 300ex cylinder for the valve relifs. but for curiosity sake, why the need for the stroked crank??
 

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I recently read on another forum about someone who used 16 oz NOS tanks on his utility quad he used for mud bogging. He spent $30 total to make the rig. I don't remember what forum it was though.
 

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is the cylinder walls thinner then??

Welcome to Four Stroke Tech.net!

why does the 300ex need a stroked crank to make the same cc's as the fourtrax would on the stock crank.
I guess the cylinder walls on the 300EX are thinner and it can't be bored as much. That's the only reason that I can think of.
 

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relihave to be for clearance i would think do they have same compression ratio
Fourtrax 300 compression ratio = 9.0 : 1

300EX compression ratio = 8.9 : 1
 

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Discussion Starter · #17 ·
I recently read on another forum about someone who used 16 oz NOS tanks on his utility quad he used for mud bogging. He spent $30 total to make the rig. I don't remember what forum it was though.
cheap and effective, just not all time power.

I guess the cylinder walls on the 300EX are thinner and it can't be bored as much. That's the only reason that I can think of.
if there the same size crank then that is probably the case.
 

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if there the same size crank then that is probably the case.
That's the only thing I can figure, since the bore and stroke are the same.
 

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That's a Fourtrax 300, too. I wonder how it ran?
 
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