hey iam kinda thinking about some topend work on the blaster how much can u mill your head i think i saw one milled flat and how much hp does it give u
yamaha blaster head milled
- Thread starter trevorman210
- Start date
we generally don't fool with dyno horsepower numbers on here,
we like the ass dyno better, you know....real world feel
and my ass dyno says the milled/redesigned head is a great upgrade
heres my "ken oconnor racing" 17cc head................
we like the ass dyno better, you know....real world feel
and my ass dyno says the milled/redesigned head is a great upgrade
heres my "ken oconnor racing" 17cc head................
If you are simply milling then 0.030-0.035 is the max for pump gas. If you get the head rechambered, it can vary.
http://www.blasterforum.com/engine-13/head-milling-what-does-you-2070/
http://www.blasterforum.com/engine-13/head-milling-what-does-you-2070/
the problem with just milling the heads gasket surface area is, the squish band it not level...
take the head off and look at it. The dome is deeper on one side then the other.. this should be leveled first.
if you level the squish band before you mill the head you can go .050" off.
if you dont...about .035"
take the head off and look at it. The dome is deeper on one side then the other.. this should be leveled first.
if you level the squish band before you mill the head you can go .050" off.
if you dont...about .035"
The problem with just milling the heads gasket surface area is, the squish band it not level...
Take the head off and look at it. The dome is deeper on one side then the other... this should be leveled first.
If you level the squish band before you mill the head you can go .050" off.
If you don’t...about .035"
For every .010" removed from the squish thickness the volume above the piston at TDC decreases by .86cc's
Typically Blaster's have a deck height about -.025". The squish thickness that's cut into the head is around .035". The head gasket is about .031". If you start by making careful measurements you can be certain the material you remove will be correct.s
Take the head off and look at it. The dome is deeper on one side then the other... this should be leveled first.
If you level the squish band before you mill the head you can go .050" off.
If you don’t...about .035"
For every .010" removed from the squish thickness the volume above the piston at TDC decreases by .86cc's
Typically Blaster's have a deck height about -.025". The squish thickness that's cut into the head is around .035". The head gasket is about .031". If you start by making careful measurements you can be certain the material you remove will be correct.s
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gawd damit why wont this site let me type any info?
i just wanted to share the calculated squish cleanaces
Base UCCR 9.84:1 = 135 psi = 22.06 cc's @ TDC
-.010" = 10.20:1 = 139 psi = 21.20 cc's @ TDC
-.020" = 10.58:1 = 144 psi = 20.35 cc's @ TDC
-.030" = 11:10:1 = 150 psi = 19.49 cc's @ TDC
-.040" = 11.47:1 = 156 psi = 18.65 cc's @ TDC
-.050" = 11.98:1 = 162 psi = 17.77 cc's @ TDC
i just wanted to share the calculated squish cleanaces
Base UCCR 9.84:1 = 135 psi = 22.06 cc's @ TDC
-.010" = 10.20:1 = 139 psi = 21.20 cc's @ TDC
-.020" = 10.58:1 = 144 psi = 20.35 cc's @ TDC
-.030" = 11:10:1 = 150 psi = 19.49 cc's @ TDC
-.040" = 11.47:1 = 156 psi = 18.65 cc's @ TDC
-.050" = 11.98:1 = 162 psi = 17.77 cc's @ TDC
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Blaner
Your Friendly South African Ambassador
Blaner
Your Friendly South African Ambassador
risky to sand it, there is no way you will get the pits out without distorting the shape of the combustion chamber.
Does this mean I have to get it milled? If you sand lightly part of the squish (I guess its called) will it give you more hp or im I going to be losing horsepower? What would I have to do to make this work after sanding..... I not sanding that much off. The most coming off I guess would be the thickness of a razor blade .this is what it looks like http://i1237.photobucket.com/albums/ff473/mac2mac2/02232011369.jpg
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Won't really make any difference in power. About the only benefit of polishing it is decreased carbon deposits on the head surface so it stays cleaner, but most of that is burned off with every deflagration in the stroke. If you are just polishing it, it's not too hard. If you are taking more off, I'd suggest just taking the head and shipping it off somewhere to get milled and rechambered.....it doesn't cost that much and they have the tools and knowledge to do it and it will result in more power. About the best you can do after that is go to a local machine shop and tell them what you want and just tell them you want to uniformly clean it up, and they can usually take care of you. Won't result in any performance gains though until you mill/rechamber the head though.
Blaner
Your Friendly South African Ambassador
ya, im not sold on sanding the combustion chamber hey, i dont think its wise unless you put it in a lathe or something to make sure you do it even. i would rather recommending having it rechambered. now thats a wise idea! blasters have a horrible squish and head design. its more cone shaped, have you ever seen anything explode in a cone shape? no, you want a dome. the squish bands are also not even on front and back of the motor so if you sand it you may make a mess of it.
