Home porting

[Blaner]

am i wrong to assume that fuel atomization should only matter inside the combustion chamber? the atomization only helps to burn the fuel more efficiently and w/e gets below the piston is mostly lubrication.

you are thinking what I was saying.

I agree with Blaaster that you want as much atomization as possible all over, or else what would be the point of the carb vapourizing fuel? But when it gets under the piston, it has time to settle and seperate the fuel out the air and therefore the oil out of the fuel. The crankcase compression as the piston moves down then vapourizes the stuff again into a mix and sends it up to the combustion chamber, so in theory your transfers and head design have the final say in what the final product of fuel/air mix looks like in terms of atomiztion.

However I see flaws in my suggestion as it would have to be a very slow revving motor or a very large crankcase or very low compression to effect the delamination of fuel from suspension in the air.

Just something to think about

 

[webmonstro]

Hi, good work there !
Did you raise the ports ? or change the shape ?
You say it was a clean up job but looks like the intakes are bigger ?
And if you did how much did you enlarge them ?

Please come back and post some results as compared to a stock blaster

Nuno

 

[Blaaster]

you are thinking what I was saying.

I agree with Blaaster that you want as much atomization as possible all over, or else what would be the point of the carb vapourizing fuel? But when it gets under the piston, it has time to settle and seperate the fuel out the air and therefore the oil out of the fuel. The crankcase compression as the piston moves down then vapourizes the stuff again into a mix and sends it up to the combustion chamber, so in theory your transfers and head design have the final say in what the final product of fuel/air mix looks like in terms of atomiztion.

However I see flaws in my suggestion as it would have to be a very slow revving motor or a very large crankcase or very low compression to effect the delamination of fuel from suspension in the air.

Just something to think about

This is where I see the problem, vaporisation is the mixing of fuel and air, this is primarially performed by the carby, I fail to see how revolving or reciprocating parts can perform vaporisation.

Now I am going to have trouble getting to sleep now, just thinking about it. ( Smiles and closes eyes)

 

[Blaner]

hahaha Agreed just that when you think about it, there is a lot of surface area and potential eddy'ing of gasses that can take place from between the carb and the combustion chamber. what I mean is that it is not a direct injection from carb to combustion.

Guess its an inefficiency in the design of a 2 stroke?

 

[Drk_rider]

I touched the top of the port a tiny bit. prolly not even a millimeter. going to see how this one runs an make improvements on the next one in a few weeks.

 

[toytech]

Toytech how did you do the triple port in yours?
Do you have a walkthrough?

I looked at pics from herr jugs racing

no I don't have a walk through, sorry

if you try it e careful there is not much material in the spot were you do them,I have two extra cyls so I gave it a try

look here

Triple Port exhaust YT175 / Blaster - YouTube

look here to

Drilling Boyesen Ports in a YT175/Blaster cylinder - YouTube

 

[Prime]

Well one things for sure. You both are real fast at trashing some one eles's thread. Thanks allot. I just wanted some good feedback. But now I dont think anyone will want to read thru all your trash to see if any real information is in there.

I think you two should just touch tips and get it over with.

Look, criticism is good feedback whether you think so or not. If you have never heard of it, it's called constructive criticism. All it's for is just to help you do better next time. (If there is a next time)

 

[blasty 95]

^they where agruing about whos d*ck is bigger not about his porting

 

[Blaaster]

Look, criticism is good feedback whether you think so or not. If you have never heard of it, it's called constructive criticism. All it's for is just to help you do better next time. (If there is a next time)

You may have missed a few moderator deleted posts, where conversations were getting unsightly.

 

[Drk_rider]

Ok put it on my buddies stock blaster not even aftermarket reeds, only has an fmf silencer and stock pipe. But it does have a +5 swing arm and a 400ex rear shock, and he can now pull wheelies. He also weighs 270lbs. It will require some jetting adjustments cause it bogs now under full throttle. I told him once we hit the jetting sweet spot his performance will get even better.

 

[hybridracer686]

did a port job on mine when i rebuilt it as well. and my exhaust port did not look near as good as yours. nice job man!I:I

 

[Blaaster]

Ok put it on my buddies stock blaster not even aftermarket reeds, only has an fmf silencer and stock pipe. But it does have a +5 swing arm and a 400ex rear shock, and he can now pull wheelies. He also weighs 270lbs. It will require some jetting adjustments cause it bogs now under full throttle. I told him once we hit the jetting sweet spot his performance will get even better.

Get those jets right before you ride again or take the chance of killing your buddies bike.

 

[N8tsNastyBlasty]

the 2 mentioned videos are mine i developed that method of triple porting the exhaust and its not always that easy but very do able. the powerband is directly effected by port timing. i would suggest getting a degree wheel on the stroker crank and correct the port timing acordingly. I thought of putting a video up about how to check and map port timing.. .

 

[N8tsNastyBlasty]

i think ur intake looks pretty awesome for a first go @it!!! adding boysens if u feel comfortable helps alot also.

 

[thatcarguy09]

looks pretty awsome! Ive been considering doing it myself when i build my spare engine