Im porting this Daliem 50 cylinder and Im wondering which directions you guys think I should take? I have an extra cylinder to decided to try and port 1 and get my Gfs bike over 35.
This is cast Iron
That exhaust port looks ridiculously small
DP50 Cylinder Porting
Re: DP50 Cylinder Porting
Don’t just go in there with a dremel if you have to ask what to do. First do a port map, then take measurements, then put it on and check the durations with a degree wheel. After you have done that you can see what can be improved upon without going too far and having a boat anchor. It is easy to go from perfect, to a little over, to unusable.
Re: DP50 Cylinder Porting
just follow that burnt carbon line to match the exhaust . pretty safe to go wider by a few mm and up a couple. fun time.
Re: DP50 Cylinder Porting
Ended up raising the exhaust about 1.5 mm and opening up the exhaust a bit, glass sanded the head removed the head gasket and replaced it with some copper spray, seemed like it revving a few hundred RPMs higher.
Also I just realized this is in the wrong section, sorry.
Re: DP50 Cylinder Porting
Looks like the only mods you could fit in there would be to open up the exhaust port , channel and port match it with you're header , maybe room to get a auxiliary exhaust ports , transfers i would not touch besides mild reshaping with a file for symmetry , but if you were able to dig a couple pockets into the bore between the transfers without breaching into cylinder studs , and add precisely timed charging holes into the piston , youd have some boost ports . Modifying the combustion zone and getting more compression and a squish would help too. I still dont know why people think spray on copper is a suitable head gasket , the reason you have a seal is because youre head is aluminum and the cylinder is iron .
fWFFF (fuckjbg rong forum fuck face)
Lol.
Re: DP50 Cylinder Porting
Have never found the source or patient 0 for spreading the copper spray gasket virus
Not sure where the idea came from, maybe a guy under torqued a cylinder and had to use spray in a pinch, then his buddy saw him do it, and it spread like wildfire
At any rate, where in the service manual does it say ‘Use pt no xxx-xxxx spray gasket’ ?
How in the fart are you able to tell it raised rpm by a couple hundred by feel?
You’ve got lots of splainin’ to do!
Re: DP50 Cylinder Porting
> SABAT! andDestroy Wrote:
> -------------------------------------------------------
> I still dont know
> why people think spray on copper is a suitable head gasket , the reason
> you have a seal is because youre head is aluminum and the cylinder is
> iron .
Glad someone else said it. I was once sick too. I was always developing leaks. Turns out gas breaks that spray down easily. Lots of people still use it and say how good it is.....Head gaskets all day everyday.
Re: DP50 Cylinder Porting
Does that mean copper blinker fluid is worthless also?
Re: DP50 Cylinder Porting
Lol I guess next time Ill just spray the copper spray in a brown bag and wear it like a mask.
I did a pre and post port map and only raised the Exhaust 1.5mm and widened and matched to the pipe.
I could tell it was revving a little higher cause I ride it every day and I know the wall it hits, this time it went past a little but nothing high strung.
Re: DP50 Cylinder Porting
your required to a post a post port picture.
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