IF YOU COULD ONLY DO 1

[stroking]

if you could only do one for a drag bike which one would you gain the most from ......... stroking a motor 5mm or boring it 5mm ?

[blowit]

if you could only do one for a drag bike which one would you gain the most from ......... stroking a motor 5mm or boring it 5mm ?

 

 

 

 

Is that really a question. :biggrin: :biggrin: :biggrin:

 

 

 

 

 

 

 

B

[2001Stroker]

Stroke it 4mm. A 5mil is a waste. You have to trench your cases, and don't gain much at all, over the 4mil.

[stroking]

i used 5mm as an example

 

and you do NOT have to trench for a 5mm

 

i wanted to know which will give the BIGGEST gain..........STROKING OR BORING

[blowit]

i used 5mm as an example

 

and you do NOT have to trench for a 5mm

 

i wanted to know which will give the BIGGEST gain..........STROKING OR BORING

 

 

 

Where do you want the GAIN? Who does a 5mm stroke anyway? Pipes, carbs, reeds, track, budget, goal??

[Ieat4strokes]

ive seen people being told a million times boring does nothing on a stock cylinder but waste the life of your cylinder. stroke it with a nice port job and you'll be happy. just my .02

[AKheathen]

simple question; simple answer.

stroke it.

 

 

 

stock is already at the end of the bore/stroke spectrum.

[FireHead]

Stroke it 4mm. A 5mil is a waste. You have to trench your cases, and don't gain much at all, over the 4mil.

That's not true.....

 

A Twister 5mil crank will go into most OEM cases without trenching them.... :geek:

[FireHead]

Where do you want the GAIN? Who does a 5mm stroke anyway? Pipes, carbs, reeds, track, budget, goal??

Knowing your goal is a good thing...........

 

In the two stroke world there are two conceptual ways to make power: Piston speed and/or combustion chamber volume. I am a piston speed type of guy, so I would be looking at a small bore with alot of stroke, or a big bore with not much stroke. The OEM Banshee config. does not support a bore large enough without extensive modification to make sense, so if you were to do just one thing, adding stroke is how to get the job done.

 

 

[2001Stroker]

Ok. Calm the hell down. The only person I seen on here with a 5mil, had to trench. I'm guessing it just depends on the pin size?????

[stroking]

Iwas on a website that offers alot of different engine combos and all with the stock cylinders are stock bore with lots of port work but different crank sizes

 

they have a

4mil stock bore

5mil stock bore

7mil stock bore

even a 10mil stock bore on stock cylinders

 

 

 

 

and FYI hotrod makes a 5mil that will drop right in.

 

 

 

[stroking]

Where do you want the GAIN? Who does a 5mm stroke anyway? Pipes, carbs, reeds, track, budget, goal??

 

this is with ALL things being = except one has been bored 5mm and one stroked 5mm.........which would show the most gain on a dyno ?????

[FireHead]

Ok. Calm the hell down. The only person I seen on here with a 5mil, had to trench. I'm guessing it just depends on the pin size?????

I don't think any of the crank manufacturers offer a larger pin size......... If the guy had to trench for a 5mil, he probably had a mismatched set of cases or they were tweaked. You should only have to trench for a 5mil if your cases are junk. :biggrin:

[FireHead]

and FYI hotrod makes a 5mil that will drop right in.

...............and no, they don't. Hot Rods makes a 5mm longer rod crankshaft which puts the rods at 115mm in length. The only stroker crankshaft they make is a 4mil. :ermm:

[blowit]

this is with ALL things being = except one has been bored 5mm and one stroked 5mm.........which would show the most gain on a dyno ?????

 

 

 

Well, is that on stock ports, mild ports, or highly modded ports? That will make all the difference of how each performs.

 

 

 

Brandon