Topic: Head Porting Testimonial

[eldar]

Ok

What I meant was, are the ports opened more on each stage and the head decked more. Basically so I know which direction I want to go.

[MRieck]

Ok

What I meant was, are the ports opened more on each stage and the head decked more. Basically so I know which direction I want to go.

Ports are opened more eldar. The Stage 3 absolutely requires new guides (many heads do anyway no matter what the stage).
  Mike

[sparty]

Ok

What I meant was, are the ports opened more on each stage and the head decked more. Basically so I know which direction I want to go.

Look at my build page to see an example of stage 3 head work.  It is PERFECT.  It will also knock you off the rear of the seat!

http://www.basd.net/staff/aentz/CB750/CB750_page.htm

Art

[RRRToolSolutions]

Ed,

Those definitions were given to me by a noted porting shop that does Flowbench for for many local race shops.

Stage I = blueprinting of ports, removal of casting flash, smoothing of transitions, multi-angle valve job with results slightly better than stock.

Stage II = enlarge ports while maintaining smooth airflow. Significant increase to flow volumes, but maintaining high velocity during mid to maximum valve lifts. The objective is to increase torque at all ranges and reduce the restrictions up to the maximum usable rpm limits of the surrounding components.

Stage III = maximize airflow at high valve lift/openings. Increase and optimize the amount of air able to flow into a filling cylinder at high rpm. While low rpm and some mid-range velocity and cylinder filling is lost at mid-range rpms, the stage III porting allows maximum filling of cylinders at high rpm for torque peaks high up in the rpm range for higher, maximum horsepower.

Regards,
Gordon

[Ecosse]

Sparty, you don't need me to tell you that bike of your is pure sex!

More pix and sound on your page please...

[RRRToolSolutions]

I should add - horsepower is torque x rpm / 5252.

So raising the rpm where the highest volumetric efficiency occurs automatically increases horsepower. Even if one engine makes less peak torque, but makes it higher - horsepower of course will be more - despite having less torque (it's the math and that rpm factor). Such an example would be a big Honda 1800 Gold Wing making more than 100 lbs of torque and a 600 making 42 - but, the 600 makes 106 horsepower at peak where as the Gold Wing only makes it to 101.

We all knew that though..

[sparty]

Stage III = maximize airflow at high valve lift/openings. Increase and optimize the amount of air able to flow into a filling cylinder at high rpm. While low rpm and some mid-range velocity and cylinder filling is lost at mid-range rpms, the stage III porting allows maximum filling of cylinders at high rpm for torque peaks high up in the rpm range for higher, maximum horsepower.

Regards,
Gordon

Exactly!  Stage III is not for those looking for a bike that is most powerful in the mid-range.  My cam requires a stage for high RPM peak power and the stage III is the perfect fit.  My mid-range power is good, not great.  My mid/high range is much better,  My high-range is just SICK, SCARY, BONKERS.  Way more than you need - just what I need.  I have tried to explain that power in words, but it is difficult.  The power builds from 5000 to 8000 RPM and then just explodes from 8000 to 10000 RPMs (imagine mashing your car's gas petal and feeling your "passing gear" kick in.  Well, multiply that by 5 and that is how this bike spools up).   I now know what to expect, but it still catches me off-guard.  I get all of my weight over the tank and into the bars and it still lifts the front off the road.  If my engine made the torque of a V-twin, I would be in big trouble.  I remember vividly that first time I took it into the upper RPMs and it made peak power.  My reaction was first shock, then awe, then "where did that come from!"  In a straight line from 60 to 100+ forgetaboutit brother, you will never catch me (I would love to know how many seconds it takes to get there because it is damn quick).  Oh, and you CAN NOT go full throttle in first or at the start of second gear.  Well, maybe you could, but I am not that stupid. Without the rev limiter WOT would explode the engine because you would not be able to catch it before it zoomed past the point of no return.  Actually, as my engine is breaking-in, it seems to be making more power (if that seems possible).  The iridium plugs make a difference as well.  I have yet to find that spot where it stops making power before the rev limiter kicks in.  Yeah I am bragging.

Art

[RRRToolSolutions]

Moving to "Other Bikes" section

[HondaMan]

Oh, yeah - the Blue Streaks and Green Monsters. I remember those! Some of my 'brother' riders had some, kept them around for Saturday nite street fights. When they switched to "on", it felt like someone started a 2nd engine inside somewhere!

[rbmgf7]

carbon fiber reeds

wow, never heard of that. the stuff i seen is typically stiff. is this your creation?

[sparty]

Art, I don't want to sound like a kid making 1-ups, but you just don't know what "on-the-pipe" means. This bike goes from about 40 horsepower to over 150 in about 500 rpm and is practically un-ridable. I've got 38 miles on it in 3 years and will soon have another $2,000 invested in getting reed blocks installed in the cylinders to help the first 6,000 rpm pull the creases out of my jeans. What was I thinking when I got the stage III porting and left the piston port induction on this one? These engines dyno at 161 at 9,800 rpm and are built by the shop with the world's record in 2-stroke triples. His latest creation has a 750 making over 220 horses - all on gas and premix Not for street though. These like mine are their limit for street/pump gas.

This next modification is going to be interesting. We'll be taking it to carbon fiber reeds using the 800-1000 Arctic Cat triple snowmobil engine design and CNC machined blocks.

Regards,
Gordon

Gordon,  that is just insane power.  I would love to ride that green machine.  Where is the wheelie bar?

Art

[RRRToolSolutions]

Moved to other bikes.

[MRieck]

 You're still talking about Kawasaki's Gordon.

[RRRToolSolutions]

Darn, Mike was getting back-logged and tons of head work lined-up and then I mentioned the "K" brand and this thread died like a skunk in the road - everyone abandoned it.

I promise no more of those smelly, smoking, green things on this thread's screen

Mike - Get to work man -

[Gamma]

What about a smelly blue and white "S" brand.
Stephens stage 3 too.

[Sam Green Racing]

Did someone mention the S brand


Sa

I'll probably rent a small van, I'll need to transport Marks CBR600 to the meeting and back.
I'm looking forward to seeing the big Suzy, it will perform if Mikes had his hands on it.
Regards the M62, I can meet you at Birch sevices before you hit the Manchester stretch (M60) that's the only part you might need help.

Sam.

Here's a pic of the JMR-Suzuki and a couple of videos of me racing my other GSX.It's a 1166cc with a head Mike ported.

Juha



http://s142.photobucket.com/albums/r104/D-Cu/?action=view&current=2007Finaalitekarundi.flv
http://s142.photobucket.com/albums/r104/D-Cu/?action=view&current=2007finaalittoinenkierros.flv
http://s142.photobucket.com/albums/r104/D-Cu/?action=view&current=2007finaalitkolmaskierros.flv

Just to prove that Mike isn't just a top guy on Hondas

Sam.

[Leino]

Sam, someone should tell that guy he can't ride  .

[Sam Green Racing]

Sam, someone should tell that guy he can't ride  .

You'll be a leg end in no time at all   just ask Mike

Sam.

[CrisPDuk]

Only just discovered this thread, my JMR head still has pride of place in the lounge



The engine was supposed to be going to BryanJ for building last year, but unfortunately work overtook me, so hopelfully it'll be heading that way this winter instead


BTW, where are my stickers Mike?   

What about a smelly blue and white "S" brand.
Stephens stage 3 too.

Mmmm I love RG500s, never quite hadthe bottle to own one though

I'm thinking of sending my lowly H100 2 smoke engine over to Mr Stephens, just because I can

[paulages]

just to bring it back to hondas... i rode quite a bit on the 718 today, and while not ignoring the benefits of the cam i'm running, i gotta say: this head flows great. i know i don't have it jetted quite right yet, and it still seems to get plenty of charge in any range.

[MRieck]

just to bring it back to hondas... i rode quite a bit on the 718 today, and while not ignoring the benefits of the cam i'm running, i gotta say: this head flows great. i know i don't have it jetted quite right yet, and it still seems to get plenty of charge in any range.

At least the 650 head starts off with a decent port Paul.

[paulages]

just to bring it back to hondas... i rode quite a bit on the 718 today, and while not ignoring the benefits of the cam i'm running, i gotta say: this head flows great. i know i don't have it jetted quite right yet, and it still seems to get plenty of charge in any range.

At least the 650 head starts off with a decent port Paul.

maybe.. but you made it really decent. 

[traveler]

sorry guys, but gotta pull another "lazarus" on ya!

Need to know more about this 718 business.....damn, I can see I'm going to be going 650 engine hunting in the future....  

~Joe

[paulages]

http://forums.sohc4.net/index.php?topic=40414.0

[jtb]

Jeez,  I got a Swain Tech sticker with my pistons, but only a Mike Rieck JMR business card with my head.

Gordon,  I enjoyed meeting you at Barbers.