Hey Steve... I know your really busy,but did you ever get a chance to try out that port work and the re-chambered "Toroidal" and "Hemi" heads?
How about the piston boost port modification?
How about the piston boost port modification?
The "best" cylinder!!!
- Thread starter joeak47
- Start date
Sorry Joe, I was away for a while and just back now. Neil has the garage cleared, so right after christmas we should be cleared for action. I am VERY anxious to try this thing out but so darned busy.
we appoligize joe for the wait. ive been busy buildin a car (Hon Da) and weve been gettin random days of snow an wet cold. i have been outa the game myself for alittle dealin with life stuff but i promise u after chrismass we will be on it and i will be back to blasterforum.
i may do a video vlog or update to show u guys what ive been up to and show the cylinder install. im just glowing to try the cylinder an heads!!
merry chrismas Joe an all others on here and happy new years- rock onn!
All right, as luck would have it we have just had an incredible warm streak up here.
I was snowmobiling on a couple feet of snow in the back country in -15c temps last weekend.
This morning I woke up to +15c and rain. By noon all the snow was gone.
Muddy as heck right now but winds should dry it up a lot by tomorrow. Do you know what that means?
Blaster weather!
Joe's cylinder is on Triplecrown's machine and we are ready for a test!
Right off the bat I can tell you it has more compression than Neil's tired cylinder.
This translates into better starting (and idle was smooth too) and more grunt off the line.
Too dark and muddy to test tonight, how will it work on top end power?
Can't wait to see.
Steve
I was snowmobiling on a couple feet of snow in the back country in -15c temps last weekend.
This morning I woke up to +15c and rain. By noon all the snow was gone.
Muddy as heck right now but winds should dry it up a lot by tomorrow. Do you know what that means?
Blaster weather!
Joe's cylinder is on Triplecrown's machine and we are ready for a test!
Right off the bat I can tell you it has more compression than Neil's tired cylinder.
This translates into better starting (and idle was smooth too) and more grunt off the line.
Too dark and muddy to test tonight, how will it work on top end power?
Can't wait to see.
Steve
I'm just as curious as everybody else,but you can't get traction in 3 feet of snow,so I'm pretty sure thats why testing is on hold. Winter...nature of the beast! Besides...You don't want to find Steve or Neil frozen in some snow drift out in the middle of the woods somewhere,on the blaster,with a big smile on they're face, when the snow starts melting in the spring. Safety first! It will start getting warm sooner than we all think.
I can't wait to go riding!
Yup, you got it pegged Joe.
We got a little bit of scoot of of it in the driveway while waiting for jets for this cold weather.
Real easy to fry pistons in cold weather, believe it of not.
We had 2 feet of snow, it melted off into a sea of mud for a day, bitter cold the next day and a couple more feet of snow again.
Three foot drifts, definate hard times for wheeled transport, heck it was even hard sleddin'!
Gotta warm up and pack down. Better weather coming.
If you can tell anything in a few minutes of wheelies and jumps, it feels darned good on the low and mid range Joe. Strong!
Steve
We got a little bit of scoot of of it in the driveway while waiting for jets for this cold weather.
Real easy to fry pistons in cold weather, believe it of not.
We had 2 feet of snow, it melted off into a sea of mud for a day, bitter cold the next day and a couple more feet of snow again.
Three foot drifts, definate hard times for wheeled transport, heck it was even hard sleddin'!
Gotta warm up and pack down. Better weather coming.
If you can tell anything in a few minutes of wheelies and jumps, it feels darned good on the low and mid range Joe. Strong!
Steve
Either there is too many builds/experiments going on to keep track of, or I'm getting old 
8-|. So, the torrie head favors the low end and hemi top? Does porting play into it as much? Or do you just have to swing one way or another? All low or all high?
8-|. So, the torrie head favors the low end and hemi top? Does porting play into it as much? Or do you just have to swing one way or another? All low or all high?
Either there is too many builds/experiments going on to keep track of, or I'm getting old
Ha!
You think you have trouble keeping track of it all, you should be in my life...
The porting dictates where the power band will be, sets the basic resonace of the engine, like a camshaft on a 4 stroke.
The pipe, intake and head should compliment the porting, when they match, you get strong power.
That said, each can sway the power a bit this way or that but often at a loss of overall maximum HP.
The differences of either head shape are small if both are 50% squish and a proper volume and squis dstance.
The toroidal head favours low and mid range because it encourages a faster burn pattern.
Several ideas why it doesn't favour top end: hard to ignite high velocity swirl (a match in a tornado), poor scavenging due to bowl shape, residual swirl blocking port flow.
Hemi chamber gives excellent scavenging at high rpms and has the minimum surface area to volume ratio for heat loss, which equals high efficiency and minimum cylinder head heating. The ideal would be a flat top piston and shallow hemi with minimum squish for maximum rpm.
You can compromise either of these shapes for maximum flexability. A deeper hemi head like I see many making here will act much like a toroidal, or a shallow toroidal will act much like a hemi.
What is wrong with the stock head?
Too much squish distance, typically 3mm at the edge, should be 1mm.
Wrong squish angle, large included angle, should be 1-3 degrees.
Too much squish area, over 60%, should be 50% (more or less).
Too small a chamber for proper turbulence.
Too long (deep) a chamber, causes flame stagnation, slow burn, cooling, and poor scavenging.
Correct those things and you are rippin'! Bowl shape is just icing on the cake!
Steve
Finally!
Great weather and a weekend off.
Life has been hugely busy for my son and I lately. He has a new job, place, car project and girlfriend. I have some new responsibilities taking my time.
BUT,
Yesterday Neil got the jetting dialled in (320/38 I think) on the JoeAK47 cylinder and head (the hemi I believe).
WOW!
It rips!. Great job Joe!
This motor pulls strong on bottom end, no typical sign of the exhaust being ported.
My guess is the excellent head design is allowing enough compression to really deliver the goods under the powerband.
Very tractable power, starts easily, idles well. Runs very clean at low speeds.
It has much more power than an unported stock Blaster under the powerband, which most port jobs do not achieve.
The real fun begins when you hit the powerband. WOW! This is the strongest Blaster I have ridden to date. It pulls strong and revs to the moon.
Neil has tall gears (15/40) and big tires (22") on his Blaster and this motor will pull strong to redline.
Wow. He has more top speed than my KTM Blaster now.
Power is very close to the 250 MX motor (40+hp), but much more fun to ride with the excellent Blaster gearbox.
The clutch is suffering, even with ATF type "F" fluid. Heavy springs are going to be needed.
This motor is a thrill. Long strong power, both under and over the band.
Very tall overrev even with this FMF pipe. Notably stronger than the DT200, especially at low rpm.
This is odd because you'd think that the power-valved motor would have the stronger low end.
I think Joe's attention to head design has more than made up for any advantage the water cooled engine has.
Sorry to be so long getting a good test Joe, but you have done fine work.
This is an excellent all round motor, hard to beat. Lock that porting design in, it is a keeper!
Steve
Great weather and a weekend off.
Life has been hugely busy for my son and I lately. He has a new job, place, car project and girlfriend. I have some new responsibilities taking my time.
BUT,
Yesterday Neil got the jetting dialled in (320/38 I think) on the JoeAK47 cylinder and head (the hemi I believe).
WOW!
It rips!. Great job Joe!
This motor pulls strong on bottom end, no typical sign of the exhaust being ported.
My guess is the excellent head design is allowing enough compression to really deliver the goods under the powerband.
Very tractable power, starts easily, idles well. Runs very clean at low speeds.
It has much more power than an unported stock Blaster under the powerband, which most port jobs do not achieve.
The real fun begins when you hit the powerband. WOW! This is the strongest Blaster I have ridden to date. It pulls strong and revs to the moon.
Neil has tall gears (15/40) and big tires (22") on his Blaster and this motor will pull strong to redline.
Wow. He has more top speed than my KTM Blaster now.
Power is very close to the 250 MX motor (40+hp), but much more fun to ride with the excellent Blaster gearbox.
The clutch is suffering, even with ATF type "F" fluid. Heavy springs are going to be needed.
This motor is a thrill. Long strong power, both under and over the band.
Very tall overrev even with this FMF pipe. Notably stronger than the DT200, especially at low rpm.
This is odd because you'd think that the power-valved motor would have the stronger low end.
I think Joe's attention to head design has more than made up for any advantage the water cooled engine has.
Sorry to be so long getting a good test Joe, but you have done fine work.
This is an excellent all round motor, hard to beat. Lock that porting design in, it is a keeper!
Steve
