hybrid chinese motors and performance tuning
- Thread starter foureasy
- Start date
have you aney thoughts on a liqwed cooled set up? 400$ isent to far of for this project and i can build parts but i live in a macinest dead zone so im on my owenRiding Rich
New Member
I did see a head kit but i cant find it now.
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Radiator.
Riding Rich
New Member
Hey Foureasy
Is that still a 47 mm bore.
What bottom end did you use.
Did you throw the crank?
Just curious.
Is that still a 47 mm bore.
What bottom end did you use.
Did you throw the crank?
Just curious.
but we have runed this thred!
BarelyAWake
New Member
I can't for the life of me figure out where there mighta been some "offense" taken or given... I could be wrong - but I think it was jus' a case of "hard to tell tone w/text" again lol
heh - in many ways, a forum is teamwork by it's very nature
foureasy
New Member
i just don't see the point of your spreadsheet, no one calculates time/area figures, because it doesn't work on every engine. it's much more effective to change timing a few degrees with the piston shape then continue making the same small changes with the ports until you go too far, then it's a simple matter of a new piston to get you right in the sweet spot.
if you want to do some math, then design a pipe. from my experience though, it will need to be shorter than either of the real guru's tell you.
if you want to do some math, then design a pipe. from my experience though, it will need to be shorter than either of the real guru's tell you.
skipu
Member
awesome no joke im almost there but im still in debate in my mind lol!!!!!!!!!!!!! that bike looks like it pulls like i said awesome
foureasy
New Member
i used the 80. i dont know what the stroke of the 49 is. these cylinders were designed for a 43mm stroke, our stroke is 40mm. either way you will have to make a base plate to raise the cylinder.
right now i am in the process of re balancing my crank. after about 5-6000 rpms the motor starts vibrating bad enough to break exhaust pipe. so i tore my motor apart yesterday and milled as much material as was removed from the factory (in addition to what was removed from the factory) from the same spot on the crank balance pads. hopefully that will put my sweet spot at 10k.
foureasy
New Member
heres what i removed from the balance pads. i wil fill the entire thing with silicone to up my crankcase compression.
this happened the other night after blasting past a car on 4th ave and failing to notice the trolley tracks. thats what i get for laughing at everyone else who has wrecked the same way.
box o parts
after i went down and the intake broke off, the motor stuck at full throttle while laying on it's side with a giant air leak. i think some street got in there and bounced around. everything looks like it'll be ok
can you see the tiny mark below the transfer? that is the only cylinder damage. i love nikasil
this happened the other night after blasting past a car on 4th ave and failing to notice the trolley tracks. thats what i get for laughing at everyone else who has wrecked the same way.
box o parts
after i went down and the intake broke off, the motor stuck at full throttle while laying on it's side with a giant air leak. i think some street got in there and bounced around. everything looks like it'll be ok
can you see the tiny mark below the transfer? that is the only cylinder damage. i love nikasil
Last edited:
Riding Rich
New Member
I recognize that rod.
It is out of a GT-5 66cc Angle Fire.
I believe the center to center distance is 88.9 mm.
I have one question if you can please help.
How much pressure is required to push the crankpin out.
Or if you have the crankpin diameter and the bore diameter in the crank i can calculate it.
It is out of a GT-5 66cc Angle Fire.
I believe the center to center distance is 88.9 mm.
I have one question if you can please help.
How much pressure is required to push the crankpin out.
Or if you have the crankpin diameter and the bore diameter in the crank i can calculate it.
skipu
Member
just push it out bro !!! you really love #'s dont ya just saying i build race car motors and bushed rods pin pistons and sleeved cylinders pressed cranks in dirt bike motors never have i measured the amount of pressure it takes to get them out only size them so they go back together properly just saying you may make foureasy crazy with asking for mad #'s on this thread you have a extensive knowledge of building motors it seems from other posts if you never split a crank give it a shot it is very simple and i like your porting thread ive done this before now = i just wing it from all my past experience ive done everything to these motors only to accomplish 5 to 5.2 hp on a speed to wieght calculator my bikes only go exactly 40 with a 36 t but pull like mad from bottom to top take it easy bro and keep up the good work on the porting thread gotta go goin street racing in the big block stang hope i can hook up !!!!!!!!! COLD HERE BRRRRRRRRRRRRRR!!!
skipu
Member
skipu
Member
heres what i removed from the balance pads. i wil fill the entire thing with silicone to up my crankcase compression.
this happened the other night after blasting past a car on 4th ave and failing to notice the trolley tracks. thats what i get for laughing at everyone else who has wrecked the same way.
box o parts
i love the pop up piston gives you alot to work with looks like ill see when i get my parts good thread and thanks again i think this will be the next level in performance due to the stock cylinders being so limiting thanks again me and my brother wanted to make our own cylinder this is truly a better option i love it !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!