Can you please explain how you came up with that dome shape?What are you cc ing the haedsat?Also do you have any proof of the 30hp claim? Thanks
Rechambered Head
- Thread starter wwholden
- Start date
Can you please explain how you came up with that dome shape?What are you cc ing the haedsat?Also do you have any proof of the 30hp claim? Thanks
Don't have the balls to call me out on this forum inbread ? You have to go over to The other forum to do it ? I don't beleave the power claim but if he can prove me wrong, ill give him max rep.
Dualstroke, you are right, I knew I would be stepping into the cow patty when posted that because it would offend some opinions, but if you read it carefully, I stand behind it as fact. First off, no, I did not dyno either engine. I owned and drove a (manufacturer claimed) 32hp DT200 for a lot of years. 85-90mph top speed. I also have a 42hp KTM 125 to compare to it as well as a ~50hp KTM 300 and a 45~48hp KTM 250 in my Blaster. Sketcky way to compare HP I'll agree, but my son (Triplecrown) has put one of those stock DT200 32hp engines in his Blaster so we have a darned good idea of what 32hp feels like and what it can do. With the KTM 250 in mine I have a good idea what 45~48hp feels like.
You can look back through my posts (some links below) to see we thoroughly investigated the differences between the 32hp DT200 and the 17hp Blaster. Hemi head chamber and exhaust port height are it. Even the stock Blaster/DT pipe differences are small. Not contend with theory alone, Neil and I put it to the test and successfully made a Blaster engine that rivalled the DT200 with only the head and raised port mods, even with a stock Blaster pipe (aftermarket still recommended!). With careful attention to squish this engine hauled even harder. Aftermarket pipe, some intake porting, more compression all added a hp or two here and there, but it was the head that made the largest gain, that put it up into the 30hp region.
Not just any modified head will put you into this hp range. JoeAK47 and I and I am sure KOC have done experimenting, one item at a time to figure what makes the power. Look over Joe and my past posts, we have been completely open with what we have found and posted pictures. I have one of Joes's engines here and it is a hauler! Snow and cold weather (jetting issues) have prevented full power tests and comparisons, but this engine really hauls butt. It is an example of simple attention to detail. Excellent cylinder head, conservative port timing and porting, nothing wild except the power output from idle to scream.
Pipe? It helps for sure but even the stock pipe will get you to the 30hp range if the head is right.
Carb? We have played with 28, 32, 35 and 38mm carbs. Not a limit at this stage.
Full port job? Moderate (but worthwhile!) gain over the port raise and rechamber. Big potential for loss if you get it wrong or over-do it.
All this stuff helps (if done right) but the largest gain is the head and port raise.
Oh yes, and like the porting, the head mod can be screwed up too. Wrong shape or squish or volume will not help.
HP does not work this way. You cannot make a list and add it up:
Stock Blaster = 17hp
Head mod = 15hp
+4 key = 2hp
raised port = 5hp
pipe = 3hp
lid off = 2hp
iridium plug = 1hp
K&N filter = 2hp
Boyesens = 2hp
Triple exhausts = 2hp
240 displacement = +20%
total = 60hp? DOES NOT WORK THIS WAY!
Any of these figures may be true on its own but they do not compile.
What is it that you are wrong about anyway? Who is calling you out? Me?
What other forum? Is an "inbread" a guy with too much money?
Personal attacks are a sure sign of an emotional resort to running out of ammo in a logical arguement.
Personal attacks say bad things about one's character and should be avoided.
In matters of "belief" most folks don't ever accept opposing logic, unless they are very emotionally secure and open minded.
Have I walked too boldly in the pasture again?
Please lighten up and use this as a place to share information.
Odds are good you'd like me if you met me.
Steve
This post was for the member names (inbread) for flaming me on another forum for giving my opinion on this forum that a head mod could add that much power. I don't have any problem with you best.
Last edited:
I agree just not any head will make magic happen.Thanks for explaining your beliefs.I do not want to clutter this thread up anymore than it already has.We will save that for another day and thread.lol
Ha! I hear you.
"Beliefs" are those things you hold to be true without question.
What would you call the things one has tested and proven? Experience?
Steve
i'm wondering how/if the shorter gearing of the blaster transmission played a roll, versus the taller gearing of the "bike" engines, in the ass dyno results ?
shorter gearing feeling more powerful than tall street gears ???
shorter gearing feeling more powerful than tall street gears ???
Certainly could be a factor if you didn't allow for it.
A bigger problem with judging the bikes is the 100 lbs less weight and much less rolling resistance.
The DT200 Blaster had a stock Blaster bottom end and transmission.
My KTM Blaster has had gearing from ultra high speed to a low of 60mph max, currently about 70mph.
Even with the very tall gears 45+HP is still pretty darned scary.
See a log or rock coming up at 30-40mph? Lean back to plant the tires and stab it. Front tires will clear it!
17HP is fun, 32HP is a wild thrill, 45+HP is a hell of a scary kick in the pants.
Steve Best
3 and a half decades of assdyno calibration... HA!
Stuck this edit in here to mention I owned a 35hp Raptor 660 for several years and have driven 37hp Banshees.
I:II:II:I
exactly why i run the 13/40 gearing with my current mods, gotta luv on command log/rock/ditch hops, in 4th and even 5th gear,
at speed !!!!! I:I
Last edited:
I guess I can chime in a bit too...
The exhaust port and head is where the power is made in a two stroke engine. Everything has to work together,but the exhaust port is where the power is made. After doing MANY cylinders for the blaster engine,and only playing with the exhaust port shape and size,I can say that without question,its the largest contributing factor in making power. This coupled with a properly designed head and proper squish distance makes an incredible jump in engine output.
Adding a thicker base gasket under the cylinder (this is actually fun to experiment with by using different thicknesses) effectively raises ALL the ports and starts to give the cylinder a much different personality. It raises the "sweet spot" of the power band rpm up much higher in the rpm range. All without grinding on the cylinder,and making something that is non-reversable.
Lower the cylinder and "here comes the torque" at a much lower RPM range. Raise the cylinder,and here comes the "bansheeish" power band.
Yes a performance pipe is what you are going to want,but that stock pipe actually works VERY well. The stock silencer is the choke point.
As for the stock carb being able to hold its own with porting and head re-chambering... No problem! I've have yet to have it fall on its face. A larger carb will help those top/higher RPM's pull harder,but I use the entire rpm range when I ride (fast trails),so I wouldn't see much benefit for me,however I plan to experiment with larger carbs at a later date.
More experimenting coming soon. I:I
WOW you guys blew up my thread while Ive been gone! Haha.
First of all I posted the 30HP because thats what Ive been told by a couple people on here when I first started re-chambering heads. And I will tell you I believe it! Why? Because of all the mods Ive done to the blasters over the years this mod wakes them up like no other. I have several nearby friends that I have ran my heads on. Their bikes range from completely stock to mild mods. Every one of them felt like they doubled in HP. I also own a 45HP YFZ450. And this mod makes a blaster feel very comparable to a 450 race quad.
Okay now to go back and try and answer all your individual questions....
First of all I posted the 30HP because thats what Ive been told by a couple people on here when I first started re-chambering heads. And I will tell you I believe it! Why? Because of all the mods Ive done to the blasters over the years this mod wakes them up like no other. I have several nearby friends that I have ran my heads on. Their bikes range from completely stock to mild mods. Every one of them felt like they doubled in HP. I also own a 45HP YFZ450. And this mod makes a blaster feel very comparable to a 450 race quad.
Okay now to go back and try and answer all your individual questions....
This is a machined surface. Rather than the casting surface that comes from the factory. If any of the two where to seal it would be a machined surface. Theres not going to be a sealing issue but if there were to be a problem with the head I would take care of it.
Yes its just like them.
If your gonna charge $40... you might want to change your sig... you say head mod for $30... Just saying...
After finding out that shipping cost me 11 bucks I was only making around $15 due to the other costs of getting the job done. Therefore Im asking $10 more to cover the shipping. Still a lot cheaper compared to what other machinist are charging ($80).
Around 20cc's
Whoa! Not so fast there...
It is not an exact copy of their designs and it does not have their 20+ years of engine building and machining experience behind it.
We have to be fair to those guys and give them their due.
Steve
I was just keeping it simple for the noobs haha. Of couse theres minor differences. Didn't want to have to get into explaining HEMI and Toroidal designs and the gains for either... Just keeping it simple, this was suppose to be a fore sale thread.
Steve beat me too it.
I can say that for a newbee just starting to cut heads that your doing pretty good,but you have ALOT of experimenting to do,and note taking to do,and real world testing to do. Thats the fun part. you can see where a change made an improvement,and where a change was detrimental.
Your heads are not "Just like mine"
Here are a few of mine for comparison...
Here's the heads and port work that I did for Steve and Neil. They are running it on Neils blaster right now. They will give a write up on all of it as soon as the snow melts. Kind of hard to test it with no traction (snow). This is before the paint was applied.
I can say that for a newbee just starting to cut heads that your doing pretty good,but you have ALOT of experimenting to do,and note taking to do,and real world testing to do. Thats the fun part. you can see where a change made an improvement,and where a change was detrimental.
Your heads are not "Just like mine"
Here are a few of mine for comparison...
Here's the heads and port work that I did for Steve and Neil. They are running it on Neils blaster right now. They will give a write up on all of it as soon as the snow melts. Kind of hard to test it with no traction (snow). This is before the paint was applied.
Last edited:
Steve beat me too it.
I can say that for a newbee just starting to cut heads that your doing pretty good,but you have ALOT of experimenting to do,and note taking to do,and real world testing to do. Thats the fun part. you can see where a change made an improvement,and where a change was detrimental.
Your heads are not "Just like mine"
Here are a few of mine for comparison...
thats internet porn right there nuff said
