Triple exhaust ports and what they are.

[toytech]

I put 4 boysen ports,triple exhaust ports,raised and lowered the intake ports .5mm, cleaned up the transfer ports a little more,and case ported, my blaster with fmf fatty pipe and turbinecore silencer on a .050 bore stock stroke with stock carb opened up 1mm and polished. I also took off stock filter assy and installed a 3.5x6 inche pod filter.

I had minor porting before with 320 main jet and 27.5 pilot

I had to go down on the main jet to a 280. I haven't done a plug chop yet but the thing rips.

does that sound rite that I needed to drop that many jet sizes? is it possible it flows that much better that it pulls that much more fuel?

 

[Paulie B]

Dropping down = less fuel

 

[sicivicdude]

Paul, I believe that what toytech was asking is, "is it possible it flows that much better that it pulls that much more fuel" meaning that the engine is more efficient at pulling fuel through a smaller jet.

To answer your question, It's possible that the engine has increased efficiency but that it's maximum power output is being limited by something unrelated to the porting and carburetion so it needs less fuel.

 

[Paulie B]

Paul, I believe that what toytech was asking is, "is it possible it flows that much better that it pulls that much more fuel" meaning that the engine is more efficient at pulling fuel through a smaller jet.

To answer your question, It's possible that the engine has increased efficiency but that it's maximum power output is being limited by something unrelated to the porting and carburetion so it needs less fuel.

Oh I gotcha thanks sicivicdude.
In that case dare I say no, you didn't increase velocity (and suction on the main jet) opening everything up like that.
Unless your some kind of undercover port master.
I could be wrong its happened before haha
Can I get a pic of the 4 boysen ports you added?

 

[sicivicdude]

Oh, I didn't want to make it sound like it was magic, what I said before. I don't believe that porting will cause you jetting to drop THAT much, only that it's POSSIBLE. I generally believe there are stranger things than anyone has seen and that a lot of things are POSSIBLE.

 

[toytech]

Oh I gotcha thanks sicivicdude.
In that case dare I say no, you didn't increase velocity (and suction on the main jet) opening everything up like that.
Unless your some kind of undercover port master.
I could be wrong its happened before haha
Can I get a pic of the 4 boysen ports you added?

I hope this works?

this is the pic I used to do mine like

I'm no porting wizzard just tried a few things and it seems to have worked. just don't understand having to go down on the main jet?

 

[toytech]

Oh, I didn't want to make it sound like it was magic, what I said before. I don't believe that porting will cause you jetting to drop THAT much, only that it's POSSIBLE. I generally believe there are stranger things than anyone has seen and that a lot of things are POSSIBLE.

I'm confused? I thought I would need to go up a jet size or 2 not down 4

 

[sicivicdude]

Well, my point is that if your combustion is more efficient but your engine is being held back by something not related to the increased efficiency, you will need less fuel to produce the same power.

I doubt you would be TONS more efficient which is why I'm dubious of the drop to 280 but it is POSSIBLE.

 

[toytech]

Well, my point is that if your combustion is more efficient but your engine is being held back by something not related to the increased efficiency, you will need less fuel to produce the same power.

I doubt you would be TONS more efficient which is why I'm dubious of the drop to 280 but it is POSSIBLE.

The compression is down about 5lbs from where it was but it runs much stronger now

when I had my banshee ported I had to go up 3 jet sizes

 

[N8tsNastyBlasty]

lets see the triples? as far as jetting goes im down to a 260 main on a 34mm flatslide and it still seems rich up top. I saw the same 4 port intake on a hjr port job i think its debateable on power difference but i think they are kewl.

 

[Spywell]

lets see the triples? as far as jetting goes im down to a 260 main on a 34mm flatslide and it still seems rich up top. I saw the same 4 port intake on a hjr port job i think its debateable on power difference but i think they are kewl.

Gabe mentioned something that is worth repeating. Those extra two intake ports up top could be a disaster if the rings are allowed to open up in those areas. That should be right around where the rings come together right? Scary thought, I wouldn't recommend others do those ports until someone does some research on the rings.

Also every aftermarket piston is different, you could stick a Wiseco or WSM piston in there and get the rings caught up in those ports by chance. I have a different engine but my rings come together just to the left of my main intake port.

The two and only two Boyesen ports that you have are pretty small also, they could be opened up a lot.

 

[Paulie B]

I hope this works?

this is the pic I used to do mine like

I'm no porting wizzard just tried a few things and it seems to have worked. just don't understand having to go down on the main jet?

Thanks for the picture! Very interesting. What does the ass dyno tell you? Do you think you are making more power then before?

 

[toytech]

Gabe mentioned something that is worth repeating. Those extra two intake ports up top could be a disaster if the rings are allowed to open up in those areas. That should be right around where the rings come together right? Scary thought, I wouldn't recommend others do those ports until someone does some research on the rings.

Also every aftermarket piston is different, you could stick a Wiseco or WSM piston in there and get the rings caught up in those ports by chance. I have a different engine but my rings come together just to the left of my main intake port.

The two and only two Boyesen ports that you have are pretty small also, they could be opened up a lot.

the 4 boysen ports go into the transfer ports not through the sleeve so no problem with rings

 

[toytech]

Thanks for the picture! Very interesting. What does the ass dyno tell you? Do you think you are making more power then before?

the ass dyno says more power. very noticable from bottom to top I:I

 

[Spywell]

the 4 boysen ports go into the transfer ports not through the sleeve so no problem with rings

The two at top reach over into the transfers? Interesting, I will have to do some research to see if there is any actual benefit in doing that. I have seen some professional port jobs but never have I seen any ports there, I wonder if they might discourage the scourging of the bottom end.

 

[toytech]

The two at top reach over into the transfers? Interesting, I will have to do some research to see if there is any actual benefit in doing that. I have seen some professional port jobs but never have I seen any ports there, I wonder if they might discourage the scourging of the bottom end.

I would think it would be like making the bottom ones bigger?

it runs great from bottom to the top end

 

[99LRDblaster]

The two at top reach over into the transfers? Interesting, I will have to do some research to see if there is any actual benefit in doing that. I have seen some professional port jobs but never have I seen any ports there, I wonder if they might discourage the scourging of the bottom end.

I've seen it quite a few times, but usually it's the bottom or top and not quad boysens. With that said, toytech's pic is what I was contemplating doing if I got my hands on a spare cylinder with the quad boysens. I personally don't see anything detrimental from doing it which has led me to wonder why everybody only runs boysens along the bottom of the intake. I guess it's supposedly a pretty tight squeeze and more difficult to do when you make the ports along the top of the intake.

 

[toytech]

the top ones were just as easy as the bottom ones.

 

[N8tsNastyBlasty]

hjr does them and i can see how they could help. I dont know though. . . . id like to put a small camera in side and run smoke through to see how they worked out. so back to the triples? got any pics? what method and tools did u use to drill/cut them?

hey blaster freek did you run urs yet?

 

[toytech]

hjr does them and i can see how they could help. I dont know though. . . . id like to put a small camera in side and run smoke through to see how they worked out. so back to the triples? got any pics? what method and tools did u use to drill/cut them?

hey blaster freek did you run urs yet?

I used a dremil with an angle head and a drill. I will get pics of my next one when it's done