Project Race Pre-bug

[sublunacy]

IF ITS AN MX PISTON REED ENGINE-

you can lower the inlet floor slightly MAYBE. but dont raise the roof at all. it can go wider to match a larger carb and increase performance everywhere.

dont touch the transfers at all.

the exhaust manifold should match the carb and cyl ex outlet in size.

after that is all done you can raise the ex port 1-2mm to increase over rev. but  the ex port area should not be more than 20 percent larger than the ex manifold or carb etc.

your mx cylinder is a hybrid of piston port engines and case reed engines. your mx piston holds back the inlet charge to build up vaccuum pressure so when it opens it gets a gulp of air and excellent carb signal. thats it....

[sublunacy]

i will add that the carb can be 20 percent smaller than the exhaust outlet and ex manifold.
it seems more confusing explaining it that way.




measure ex manifold THAT is Q

---------AREA--------
cylinder outlet =Q
cyl ex port area=Q+ 20%
tranfers do not touch.
inlet area=? depends on model and carb size
carb=Q - 20%

---------PORT TIMING-------
IF YOU INCREASED Q- raise the exhaust port to increase port time open. and maybe the inlet floor.
IF Q IS STOCK- dont raise the exhaust port. dont change the inlet floor.


let me know if you need clarification somehow. i will want pictures b4 i tell you to lower the inlet floor.


-

[sublunacy]

IF ITS A CASE REED ENGINE- ask me again because i just explained everything for a piston reed engine. maybe i got the question wrong somehow.

[PIG]

Instead of buying a new pipe I figured I could make my old S6 pro pipe work. The head pipe is from the S6 touring pipe that I usually run on this motor. I may weld a caller on the pro pipe so I can switch back and fourth between the two pipes. What do you guys think? This should work right???

[spaz12]

I don't see why it wouldn't work.

[190mech]

Heck yeah,splice that baby,gotta be better than nothing,perhaps better than Stage 6 made it!!

[sublunacy]

the header is 8 inches too long. so it will run hot untill the silencer is shortened 4 inches and it still will not be right.

expect a 4000 rpm peak hp and melted piston at 8000rpm

[PIG]

Jan 18, 2016 19:56:31 GMT -5 sublunacy said:

the header is 8 inches too long. so it will run hot untill the silencer is shortened 4 inches and it still will not be right.

expect a 4000 rpm peak hp and melted piston at 8000rpm

Really? The header is 4 inches longer then the pipe originally was.

['O'Verse]

Nice splice.... Is that Snakeskin duct tape?

[sublunacy]

yea/ i should have said 4 inches but the rest i stand behind. peak power lowers a 1000rpm for every inch added.

[sublunacy]

and remove a 1/2 inch of silencer for every inch added to the manifold. your cvt transmission will be nothing but problems.

[PIG]

I'm not worried about the CVT I'm pretty good at setting them up. Do think the actual S6 vertical pipe that they make is that much different in length then what i pieced together here? The header pipe has to be real close in length no? And I doute they make two different silencers for the horizontal and the vertical.

[sublunacy]

i have done it. and thats similiar to what was described to me while i messed with it.


put it in the pit or get it within a quarter inch of correct.

[PIG]

Thanks for all the info man, I really appreciate it. I have few silencers laying around that might be shorter. If not I'll cut this one down.

Thanks again.

[sublunacy]

proarturs is selling a leovince tt. you could probably get it for 50 dollars.