Porting questions..

[sporty982000]

K, All. I am trying to ask the more asdvanced builders who have done port work a few questions.

First a comment:


One of the common things I see in many of the porting posts.

Is that, aside from there being a few different types of porting,Meaning changing the size of the intake port or exhaust port.


But i think some get confused, when it comes to just polishing a port.

Example. The exhuast port, polishing, smoothing out the surface. This is really not true porting. its just smoothing out the exhuast air outlet flow.

But the questions I have is.

I have trouble finding a template or recommend size for enlargement of either the exhaust or intake ports.

For the DIY people.

does anyone have some templates, that can be downloaded and perhaps traced over with tracing paper onto a piece of carbboard to use ?

I did my first exhaust polish several years ago. never really seen it as called porting, but more polishing.

I did my first one in 1993 on a articat jag 340 snowmobile. and I did it on a lawn mower engine and weed eaters and chain saws.

So while Im not a pro, I have done a few polishing of the exhaust port/s.

I didnt know if anyone had the trail port template, on magnets and could place them ona paper and scan them and post, size for size. share the templates.

Sporty

 

[joeak47]

I've posted this MANY times. Here ya go...

Race Logic: World Class Performance

 

[sporty982000]

Ya have seen that link. I meant someone can share / post a template, As I mentioned in original post.

Ill be doing a 3rd blaster in a few months and its something 4 me to ponder. its months away tho.

Sporty

 

[joeak47]

Sporty982000, I'll get rolling on my>>>

HOW TO DO AN "AGGRESSIVE DESERT" TRAIL PORT THREAD" very soon.

This is how far I've got so far...
http://www.blasterforum.com/engine-...sive-trail-port-your-blasters-cylinder-49500/

There are some pictures there of the porting templates.

The re-chambered squish band hemi head (my other videos) goes with this porting like "Bread and butter".

I'll go into depth in the videos and show everybody everything.

#1 Intake windows
#2 Exhaust port
#3 Tranfer ports
#4 Blending and smoothing
#5 matching the tranfer ports to the case
#6 Lapping the cylinder head gasket surface
#7 Etc,Etc

Right now I've got some projects to complete.

I'm looking for a cylinder to do the porting on. I've done many cylinders for the blaster,but mostly for close friends.

The sooner I can come up with a cylinder,the sooner I can get rolling on the video's.

I WILL NOT waste my time on a junk cylinder. I need one that will be ran on an engine for review. All the ones that Ive looked into lately are worn out junk on they're last bore.

 

[sporty982000]

Sounds awesome Joe, and thanks.

AW08 contacted me in PM. So I will try and once again clarify a few things.

If there are some videos that I missed or are dead links. Then please keep in mind, the only videos I seen, 5 of them, was basically, smoothing the exhaust port and polishing.

There was oen grind soem of the defect over cast on the instake port edges.

But I have not seen videos of hwo to change the shape of the porting and the different size/ ect, of what U call true porting.
SO this is nto a bash on anyone.

The videos that I saw, basically DIY porting. To me it was smoothing and polishing the exhaust port.

I have not seen a DIY video, of changing the exhaust or intake port chamber sizes or specs.

Again, my concern was, if a visitor comes or newbie, sees basically a polishing exhaust port, and thinks he just modded the heck of out it.

So maybe the title was not correct, or some videos were missing. I dont know.

I just want to caution, that we need to be carefull and show and explain or show, the differance/s.

Its like we here, someone thinks when they got there cylinder bored out .020. and now they think they got a 220cc engine.

Sporty

 

[Triplecrown421]

But I have not seen videos of hwo to change the shape of the porting and the different size/ ect, of what U call true porting.
SO this is nto a bash on anyone.

The videos that I saw, basically DIY porting. To me it was smoothing and polishing the exhaust port.

I have not seen a DIY video, of changing the exhaust or intake port chamber sizes or specs.

Again, my concern was, if a visitor comes or newbie, sees basically a polishing exhaust port, and thinks he just modded the heck of out it.

Sporty

when i relized the dt200 was the exact same as a blaster motor but with 30hp i was set out to find one and swap it into my blaster. after getting ahold of a dt200 my old man (best) and i wanted to figure out how the motor produced almost twice the power out of the same motor.
The answer the dt200 minor(1-2mm) raised and opened intake and exhaust ports with a chambered head. plain simple. almost a light polish.

ive always wondered what really would be best for a finishing surface... almost everyone says polished.... as for exhaust and head i agree fully, it seems to stop the carbon from building after combustion. But as for intake and transfors ive always wondered about a "sand blasted" finish. the rough surface would tend to not let fuel puddle up like liquid dos on a polished finish. plus i wondered if the flow over the rough would be better then polished...

most dont like to share there secrets...this is my .02 cents

 

[Awk08]

sandblasted intakes..........

polished dome...........

and no, i'm not giving out numbers, LOL

 

[sporty982000]

when i relized the dt200 was the exact same as a blaster motor but with 30hp i was set out to find one and swap it into my blaster. after getting ahold of a dt200 my old man (best) and i wanted to figure out how the motor produced almost twice the power out of the same motor.
The answer the dt200 minor(1-2mm) raised and opened intake and exhaust ports with a chambered head. plain simple. almost a light polish.

ive always wondered what really would be best for a finishing surface... almost everyone says polished.... as for exhaust and head i agree fully, it seems to stop the carbon from building after combustion. But as for intake and transfors ive always wondered about a "sand blasted" finish. the rough surface would tend to not let fuel puddle up like liquid dos on a polished finish. plus i wondered if the flow over the rough would be better then polished...

most dont like to share there secrets...this is my .02 cents

Thanks, well read.

Ya my intake is sand plasted.
Iwish I still hand my wind tunnel tester. I dont.

I would be curious to match the air flow and air speed in a tunnel tester and see what it looks like and naturally have a few different ones to see what it looks like and how it performs.

Yes the Dt read and article and postings was pretty good info and read.


Thanks for the proffesional reply

Sporty

 

[blasterfreek30]

we sand blast our intakes too

 

[blasterBruce]

we sand blast our intakes too

That Work looks great , I esp like the bigger Boyesen ports and the Small Bridge looks good too !

 

[best]

Well, if you want to flow test ports it can be done with a shop vac and vinyl lines hung from the ceiling into a bucket of water as a manometer. Just a hint though, the most flow does not make the most power or the fastest machine. One of best tricks with this rig is seeing where you can add putty (and later epoxy) without reducing flow. Stuff as much epoxy into the intake ports as you can without reducing flow to go fast. You want an idea what the transfer port is doing? Play with it under the water tap. Watch what the water does.

What does the air/fuel do when it gets to big ports?
What do people do when they get to a big room?
They slow down and drop their stuff. So it is with air fuel.

 

[sporty982000]

Well, if you want to flow test ports it can be done with a shop vac and vinyl lines hung from the ceiling into a bucket of water as a manometer. Just a hint though, the most flow does not make the most power or the fastest machine. One of best tricks with this rig is seeing where you can add putty (and later epoxy) without reducing flow. Stuff as much epoxy into the intake ports as you can without reducing flow to go fast. You want an idea what the transfer port is doing? Play with it under the water tap. Watch what the water does.

What does the air/fuel do when it gets to big ports?
What do people do when they get to a big room?
They slow down and drop their stuff. So it is with air fuel.

Best, thats pretty cool, you did that ?

would that be, due to the low pressure of air vacuum, ? thru the crank ? versus adding in a fuel pump ?


which, has anyone done a fuel pump on a blaster ?


Sporty

 

[joeak47]

Why would you want to add a fuel pump to a blaster?

 

[sporty982000]

Why would you want to add a fuel pump to a blaster?

I dunno, I was just asking, if you went to port moreect, woudl you not at some point, reach the pioint of no return, where the blaster engine cant produce enough vaccum due to the mods to pull in the air./ fuel .

I guess thats what i was trying to say ?

Would a fuel pump, allow you more and faster flow, with all the mods for the air flow ?

Sporty

 

[Blaaster]

Gravity alone will allow more than enough fuel to enter the float bowl.

 

[sporty982000]

Int post, think I either did not convey it right or you are not grasping what I was asking. In my comments to reply in post.

Let, me try explaining it better.


(I dont want a fuel pump)

I asked if there was a point of return, with the mods done to the intake port, that the engine vauccum, would not be enough to pull the air and fuel thru. Would it loose vaccum pressure. Wich widening the ports, Meaning is there a point of no return.

Where if you mod to much, you have to adjust for it elsewere.

And I actually feel I made a mistake, So sorry. I think i was refering to fuel injection, not a fuel pump. My bad. sorry.

Make my share of mistakes too. And if that does not make since.


Then I would have to talk to you on the phone..

Sporty

 

[sporty982000]

we sand blast our intakes too

the extra wholes in the there / wat sixe arethey 1/4 inch ?


I s that angling to the port housing ? that looks real tricky to drill.


Sporty

 

[best]

Best, thats pretty cool, you did that ?

would that be, due to the low pressure of air vacuum, ? thru the crank ? versus adding in a fuel pump ?

which, has anyone done a fuel pump on a blaster ?

Sporty

Not with a Blaster, but I have with small block Ford and Supercoupe heads.
This was to flow test ports, to see if the work done was an improvement or an impediment. You asked about flow testing.
Set the head on a plastic drainpipe "cylinder" and either draw (preferred) or blow air through the ports with the shop vac. Use the vinyl line manometer to compare pressure drop (restriction) across it of various port configurations at different valve lifts. Very upset to find my maximum flow head was hard to jet and drive. Very little power (comparatively speaking) at anything but full throttle.

My experience with those heads and "stuffing" earlier 2 strokes with epoxy makes me feel those beautiful picts of hogged out reed boxes are so wrong. You need to reduce the volume in there, not increase it. YES bigger windows are a better idea. YES I like the idea of Boyesen port (have not tried them yet), but removing aluminum to increase volume inside the crankcase anywhere is a bad idea in my opinion.

Have a look at the two ports below, stock compared to the epoxy stuffed port.
Notice in the stuffed port on the right there are no dead corners? 3mm plates added to each side?
The windows in this cylinder are wider and higher than the stock head on the left but other than opening them up there is no other metal removed.
No dead corners, no dead air, no fuel separation, tight volume, fast flow.

Ever notice the leading edge of any aerofoil?
There are important reasons why you do not lead with a sharp edge, unless the airspeeds are over the speed of sound, and ours are not.

Sporty, those holes are "Boyesen ports" named after the same guy as the reeds. 2 strokes made a transition about the time our Blasters evolved, from the piston being a valve into the crankcase, to the reeds opening up directly into the crankcase and avoiding the piston altogether. The Blaster is stuck in the middle. Boyesen ports are an attempt to get more induction around the piston and into the crankcase. Looks like a good idea and probably the next thing Triplecrown and I are going to try, while trying to keep the reedbox volume to a minimum, of course!

No need for fuel pumps, Mr Bernoulli figured out a way we could draw fuel if we have flow.

 

[OConnor Racing]

Sporty, The vids are much more than a lesson on polishing the exhaust. Did you watch them? The porting you see in the vids made 28 HP with a KOR head modification. Almost double the stock HP. If you want to get more then you got from the vids, just buy the sport port templates. I think they cost $70 shipped. Small price to pay for some awesome power. They make great power and you won’t be disappointed. John is a good friend of mine and I better not see anyone posting his specs. John was an engineer for Yamaha for decades and he’s worked very hard to get where he is today. This is how he makes his living. I have port maps from Flotek, Wildcard, HJR, LRD, Hollywood Dirt Productions, Eric Gorr, SDR, Trinity and Pro Circuit and I’ll never give them out. Just good business ethics in my opinion. It’s cool to see what everybody else is doing but we at KOR haven’t changed a thing. Just order the templates from John and feel the burn Boss.

 

[sporty982000]

Sporty, The vids are much more than a lesson on polishing the exhaust. Did you watch them? The porting you see in the vids made 28 HP with a KOR head modification. Almost double the stock HP. If you want to get more then you got from the vids, just buy the sport port templates. I think they cost $70 shipped. Small price to pay for some awesome power. They make great power and you won’t be disappointed. John is a good friend of mine and I better not see anyone posting his specs. John was an engineer for Yamaha for decades and he’s worked very hard to get where he is today. This is how he makes his living. I have port maps from Flotek, Wildcard, HJR, LRD, Hollywood Dirt Productions, Eric Gorr, SDR, Trinity and Pro Circuit and I’ll never give them out. Just good business ethics in my opinion. It’s cool to see what everybody else is doing but we at KOR haven’t changed a thing. Just order the templates from John and feel the burn Boss.

Thank you for chiming in Ken.

I have no idea, if I am even going to do anything with the cylinder. Im just asking questions and making comments, based on what I see and hear. Ya know what most curious people do !

And I figured, like amny people, when a DIY is out. that kind of info gets shown and ect.

I think around here, to many people are biz connected or related. Its always bring up conflict, in the DIY world.


Ken, as you know, It's a hard balance in the forum world and chat world. a balance act, of help and support. while keeping in mind the world of sales and biz.

I think you do well in doing that.

But the first 5 videos I seen, I felt it looked more like showing how to polish a exhaust port. Thats my view.

And thank you for allowing my view. without making it a attack.

Sporty