Re: port and polish??
also..... please keep these 3 threads u have going.... in one ur kinda asking the same question
also..... please keep these 3 threads u have going.... in one ur kinda asking the same question
Faster blaster??
- Thread starter blasterfinatic
- Start date
Re: port and polish??
It's around 150-300 depending on who you have do it. Figure in another 100-200 for a bore/hone and a new piston if you need it, 20+ shipping both ways, 20+ for gaskets, ~20 for a leak tester and ~20 for plugs and jets if you don't have them already (don't scrimp here, there are lots of posts here from guys who did and fried their brand new top ends.)
It's around 150-300 depending on who you have do it. Figure in another 100-200 for a bore/hone and a new piston if you need it, 20+ shipping both ways, 20+ for gaskets, ~20 for a leak tester and ~20 for plugs and jets if you don't have them already (don't scrimp here, there are lots of posts here from guys who did and fried their brand new top ends.)
Re: port and polish??
Porting is probably the best single mod you can do but it works best in conjunction with a series of other modifications. If you are just getting started and on a budget the head mod is a cheap way (50-75 + s&h ) to bolt on some power and it will work well with future mods.
Porting is probably the best single mod you can do but it works best in conjunction with a series of other modifications. If you are just getting started and on a budget the head mod is a cheap way (50-75 + s&h ) to bolt on some power and it will work well with future mods.
Re: port and polish??
3 threads merged
or.....
all bovine scatology shoveled into one pile I:I
3 threads merged
or.....
all bovine scatology shoveled into one pile I:I
If you have a tight budget do this : http://www.blasterforum.com/engine-13/cylinder-porting-diy-25773/
Can also raise ex port .5mm and blend into sides.
Advanced timing doesn't add much to top end power but does increase low to mid.
Without porting that carb might actually be hurting you.
And because there is more than one dog who can skin a cat : http://www.blasterforum.com/engine-13/official-builders-shops-51887/ I:I
Can also raise ex port .5mm and blend into sides.
Advanced timing doesn't add much to top end power but does increase low to mid.
Without porting that carb might actually be hurting you.
And because there is more than one dog who can skin a cat : http://www.blasterforum.com/engine-13/official-builders-shops-51887/
I:I
Power comes from PLAN.
P = Pressure, average pressure on the piston through the stroke
L = Length of stroke, part of the displacement formula
A = Area of the piston, or the diameter of the piston, cuz it will equal the same result, other part of displacement.
N = Number of strokes per minute, basically RPM or 1/2 RPM if it is a 4 stroke
That is it, the only way to make power is Pressure, Displacement and RPM. No other magic.
You can get a bit more to the wheels by saving friction, make it rev a bit quicker by shaving inertia, but PLAN is the secret to power.
Knowing that we are starting with 17hp you can figure the % displacement increases the power.
Raise the displacement from 195cc to 201cc is about a 3% increase. Power will likely increase the same.
Raise the RPM from 8000rpm to 8800rpm, power will likely raise 10% (minus increased friction and flow losses).
The largest increase available to us is pressure. Hard to gauge average cylinder pressure because the pipe acts like a supercharger increasing it.
The problem is, you have to raise that pressure without causing detonation. That requires a specialized combustion chamber.
So there is the start to more power in a Blaster. The secret to cheaply doubling your power.
Steve
P = Pressure, average pressure on the piston through the stroke
L = Length of stroke, part of the displacement formula
A = Area of the piston, or the diameter of the piston, cuz it will equal the same result, other part of displacement.
N = Number of strokes per minute, basically RPM or 1/2 RPM if it is a 4 stroke
That is it, the only way to make power is Pressure, Displacement and RPM. No other magic.
You can get a bit more to the wheels by saving friction, make it rev a bit quicker by shaving inertia, but PLAN is the secret to power.
Knowing that we are starting with 17hp you can figure the % displacement increases the power.
Raise the displacement from 195cc to 201cc is about a 3% increase. Power will likely increase the same.
Raise the RPM from 8000rpm to 8800rpm, power will likely raise 10% (minus increased friction and flow losses).
The largest increase available to us is pressure. Hard to gauge average cylinder pressure because the pipe acts like a supercharger increasing it.
The problem is, you have to raise that pressure without causing detonation. That requires a specialized combustion chamber.
So there is the start to more power in a Blaster. The secret to cheaply doubling your power.
Steve
Being a single guy, I try to talk about such things to the girls.
They just don't seem interested...
They said I was "pedantic".
What the heck does THAT mean?
Steve
