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Discussion Starter #1
Hey, I've been off here for half a decade, I'm back.
Thought I'd share a selection of heads since this is one of the big places where power is made in a Blaster:

Front left is stock Blaster cone shaped chamber
Front right is Vito Big Bore Kit cone shaped chamber
Back left is a Torroidal chamber
Back right is a Hemisherical chamber similar to the DT200


I have more heads, which are on running machines at the moment.
Most are Torroidal or Hemisperical variations. The variations typically are:
1) Head volume 18-25cc
2) Squish area % variation
3) Chamber to squish blend, sharp angle or smooth blend.

I have some opinions on what works best but want to hear your opinions.

Steve
 

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So is it enough of a power adder that you can feel?
 

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Discussion Starter #3
So is it enough of a power adder that you can feel?
Absolutely. The rechambered head on a Blaster is about a 3-5hp gain all by itself and it really multiplies other mods like a pipe or porting.

The original head was purposely designed to limit power.


 

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Got a 5 HP one you would sell?
 

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Discussion Starter #5 (Edited)
Got a 5 HP one you would sell?
Ha! No I don't but I'll gladly share information on how to build you own or order one from Ken O'Connor Racing.



The stock Blaster is 17hp at about 7500 rpm.
The head on the right is a copy of the DT200 which makes 32hp at about 8000 rpm.
You will need to do a bit of porting on the exhaust and open up the airbox a bit to get DT200 hp out of the air-cooled engine. A better pipe will help as well.

The head on the left is a torroidal design for more mid-range power.
Won't rev quite as high but will climb hills like a son-of-a-gun.

Blaster with a DT200 motor.



I was being quite conservative with the 3-5hp forecast.
My son is running well over 30hp with his air cooled Blaster.

The head is the start of the hunt for HP in a Blaster.
You are lucky if you can get 25hp with all mods without a re-chambered head.

 

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I bought it with a Vits big bore kit in it, so it may have the vitos head. Im not sure how to tell.. I suppose I'll snap a picture when the head is off.

Last time i put a piston in it I put the vitos 3mm crank in it. It runs out pretty well but don't feel like 30 HP to me..
 

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Discussion Starter #7
No, I have a 3mm crank and Big Bore Vitos in this Blaster too:


My estimation is about 25-27hp. Would you agree?
RPM is slightly higher than stock, but not much, and it is lacking in the mid-range.
I was disappointed that 50cc more displacement did not give any great gain in mid-range.

Much of that is due to the large ports on the Vito's cylinder and the poor head design.

I do have the Torroidal head on now, but due to huge snow, cannot really try it out.
It does feel more torquey in the mid-range but I have no HP estimate yet.

Steve
 
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