Triple exhaust ports and what they are.

[sicivicdude]

joe doesnt have any of these extra ports, hmmmmm..............
wonder why he's so fast on the trails ??????

Probably has something to do with his wanton disregard for his life and limb, not how many go fast goodies he's got....

N8t, you got some balls boy... taking a center punch and a drill bit to a cylinder like that. I'll give it to you, you win the award for inventiveness.

 

[sicivicdude]

I tell you what would help you get the drill bit started inside the exhaust port, take a 1/4" double cut burr with a straight end and put a notch in the aluminum to create a void so the drill bit has a little divot to start inside of instead of skipping along the aluminum

 

[Paulie B]

I see this as working, but at what cost?......and does that cost outweigh losses?

The way I see it, with porting and then triple exhausts, you do eliminate exhaust gases quicker and more completely. However, with a portion of the fresh intake charges being mixed with exhaust gases, much of the fresh intake charge would be lost in the extra volume of the triple exhaust ports.

Example(random #s):
-Conventional porting loses 8% of fresh intake charge as piston closes the exhaust port going towards TDC.
-Triple exhaust porting loses 12% of fresh intake charge as piston closes the exhaust port going towards TDC due to extra volume of triple exhaust port allowing more space for RETURNING fresh intake charge from pipe to remain.

I suppose that's my biggest question. Now if you could somehow add in valves similar to reed petals to open and close the triple ports(where they meet the main exhaust port), I could see it being even more beneficial.......however that's much easier said than done concerning the temps it would have to endure and judging by the amount of pressure/vacuum draw you would need. Another way you could maybe improve backflow slightly is to put a lip on the entrance of the triple exhaust ports into the main exhaust port so that it flows just as well during the exhaust phase, but when the intake charge is returned the air flow flows more over the lip to help direct it back through the main exhaust port and back into the cylinder.

The solution to your question- expense no option, would be to have a rotary valve system on the intake and exhaust.
At that point just go buy a 4 stroke haha

What's better then reed valves? I'll show you! - E2S

 

[Awk08]

Probably has something to do with his wanton disregard for his life and limb, not how many go fast goodies he's got....

and you thought "no fear" was just a t-shirt company

 

[blasterfreek30]

joe doesnt have any of these extra ports, hmmmmm.............. wonder why he's so fast on the trails ??????

hmmm..mabe because u have been on those trails forever....cant knock it u have never ridden a bike with triples and boyesons in it

 

[super noober]

hmmm..mabe because u have been on those trails forever....cant knock it u have never ridden a bike with triples and boyesons in it

I WANT TRIPLES!!! lol. whats up with your cylinder freek? you get a chance to run that biotch yet??

 

[slickerthanyou]

joe doesnt have any of these extra ports, hmmmmm..............
wonder why he's so fast on the trails ??????

YET!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! I see some in your future, young man, now that will be $10 dollars for your fortune! (in my gypsy voice)

 

[99LRDblaster]

The solution to your question- expense no option, would be to have a rotary valve system on the intake and exhaust.
At that point just go buy a 4 stroke haha

What's better then reed valves? I'll show you! - E2S

It is a shame nobody ever made any quads with the Rotax engines. I see the transplants every time I go up to Silver Lake, but never rode one.

 

[99LRDblaster]

I have been trying to send this all day but the forum keeps giving me errors when I preview or submit the message.
Original message:
Maybe you should think about it a little more. Did you notice the KTM picture above and how it closes at low rpms and opens at high rpms? The purpose of the triple ports is to remove more exhaust gas while creating more vacuum which pulls more gasses into the cylinder. I don't doubt your logic but I think it would only apply at low rpms which is why the KTM closes. At high rpms on a tuned pipe in theory you should gain a much higher charge.

Two strokes are made to be in their powerband and it's really silly to think you will be idling a 2t around all day lol. In other words, I don't think your analogy would prove itself while the engine is at high revs.

I don't doubt that, but at the same token, I wouldn't want a drag engine either where it falls flat on it's face anywhere besides top end.

 

[sicivicdude]

The solution to your question- expense no option, would be to have a rotary valve system on the intake and exhaust.
At that point just go buy a 4 stroke haha

What's better then reed valves? I'll show you! - E2S

If expense was no option, you would install a gas turbine and all of the running hardware associated. 200 SHP out of a 60 lb engine? Priceless....

It is a shame nobody ever made any quads with the Rotax engines. I see the transplants every time I go up to Silver Lake, but never rode one.

Rotax engines are no silver bullet. All they did was continue to develop the technology instead of making the same quad from 1988 to 2006. The same could be said for yamaha on the YZ250. They've continued to upgrade and reinvest. A rotax 800cc would be like bolting 3 YZ250 engines together is all...

I don't doubt that, but at the same token, I wouldn't want a drag engine either where it falls flat on it's face anywhere besides top end.

Triple exhaust ports would help blow-down across the entire RPM range. Some of the modifications (huge carb and drag) pipe that might go with triple exhaust ports make the power band very peaky... not the ports themselves.

 

[StrokedTater244]

Triple exhaust ports would help blow-down across the entire RPM range. Some of the modifications (huge carb and drag) pipe that might go with triple exhaust ports make the power band very peaky... not the ports themselves.

correct..i got a flotek triple port on a stroker in my trail blaster with an (agrressive trail port) 35mm pwk and it has tons power right now! bottom to top!

this is with 14/38 gearing and 20" rear tires. it will come outta the hole screaming spinning and wheelie'n in 2nd gear, even on the hard road.

 

[slickerthanyou]

correct..i got a flotek triple port on a stroker in my trail blaster with an (agrressive trail port) 35mm pwk and it has tons power right now! bottom to top!

Sweet! Now there is a great piece of Info! I love this thread, well most of it!

 

[N8tsNastyBlasty]

my bikes have good power down low and up top! it's just meaner up top. if you watch my vid in the sand of the junk ol bike i ported it stands up right off the bottom.

 

[Awk08]

hmmm..mabe because u have been on those trails forever....cant knock it u have never ridden a bike with triples and boyesons in it

i wasnt knockin it,
and i dont remember anyone waitin for me at busco, where the playing field was level

 

[Paulie B]

I can't wait to hit the trails with you guys this year.
I did go on one ride- not sure if awk was there but had to head back for fuel 8-|

 

[blasterfreek30]

I can't wait to hit the trails with you guys this year.
I did go on one ride- not sure if awk was there but had to head back for fuel 8-|

u couldnt find him because he was so far ahead of eveyone...he had to stop and wait for us8-|

 

[super noober]

u couldnt find him because he was so far ahead of eveyone...he had to stop and wait for us8-|

omg lol... hahahahaha I:I

 

[Awk08]

I can't wait to hit the trails with you guys this year.
I did go on one ride- not sure if awk was there but had to head back for fuel 8-|

i was a few bikes behind paulie, i didnt wanna be right behind, in case that chain snapped again !!!!!! hahahaaaaa

u couldnt find him because he was so far ahead of eveyone...he had to stop and wait for us8-|

now you're just bustin my balls, my "fast in the trails" was not a shot at you, or anyone, or what motor mods we have, as you, batt and a few others were right on my ass all weekend long, on my own trails !!!!!
was that triple/boost/boysen ports, or stroker cranks, or what builder we use ????
i don't think so !!!!, it has way more to do with rider skills (my only point with my previous statement above)
i have a feeling some of us could do the same on a stock motor

 

[Awk08]

omg lol... hahahahaha I:I

i tell ya, you flotek boys with your subtle shots and inside jokes..............

i wouldnt laugh too hard at that, cause the only time i saw you at my ride was at camp, or the one time i decided to see who was bringin up the rear, and it wasnt hudak

 

[super noober]

i tell ya, you flotek boys with your subtle shots and inside jokes..............

i wouldnt laugh too hard at that, cause the only time i saw you at my ride was at camp, or the one time i decided to see who was bringin up the rear, and it wasnt hudak

bAAAAAAAHAHAHAHAH with my blown out tires and fuuuucked up skid plate??? and who are you to talk about subtle shots? thats all you do!! ok here it is.. i am honestly not impressed with kens work at all, yeah he can make power (because he copied floteks specs) and he is a asset to the forum but i dont belive he is gods gift to blasters like lots of guys do... and you talk about people nuthugging??? take a look in the mirror yo....