Did some basic porting on my 1UA cylinder and thought I'd share the before and after photos.
It supprised me to see how the flow of the upper half off of the reeds seem to collide into a wall of metal for in the stock setup.
I don't know what effect it will have as pretty much all else except the exhaust are still stock.
Plan to use carbon reeds from Boyesen or similar though.
Next I will bore the cylinders to 64,25 with fresh pistons and set the squish.
Cheers
1990 F2 DIY porting
Moderator: rztom
1990 F2 DIY porting
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RD350 YPVS 1990
F2 converted to N2 Red/white 1986 - Figaroli pipes
RD350 YPVS 1990
F2 converted to N2 Red/white 1986 - Figaroli pipes
- Redline Junkie
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- Posts: 624
- Joined: Tue Dec 25, 2012 12:55 pm
- Location: Halifax, Nova Scotia Canada
Re: 1990 F2 DIY porting
It is one thing to “clean up” ports and another to change the height or width of the port where it meets the cylinder. That would cause a change in port timing and vaccum for either better and sometime worse.
Matching the cylinders to the crank case is a easy blue print job that should improve transfer, because from the factory they are crude!
Matching the cylinders to the crank case is a easy blue print job that should improve transfer, because from the factory they are crude!
1985 RZ350F being restored now!
1987 RZ350 Stock
1985 RZ350F basket case
1985 RZ500 Stock
1987 RZ350 Stock
1985 RZ350F basket case
1985 RZ500 Stock
Re: 1990 F2 DIY porting
Yes I agree.
No messing about with port heights or widths in this case. That I would leave to professionals.
The cylinder base-to-crank port match wasn't to bad from stock from what I could see by comparing to a gasket. But I am doing top end only for now.
Anyway, are there such things as tuning port maps available anywhere??
I mean if I had the "recipe" for stage 1 or 2 port job I would consider it for a off season project.
-I have searched the net for maps, but could only find stock port maps.
Kjell
No messing about with port heights or widths in this case. That I would leave to professionals.
The cylinder base-to-crank port match wasn't to bad from stock from what I could see by comparing to a gasket. But I am doing top end only for now.
Anyway, are there such things as tuning port maps available anywhere??
I mean if I had the "recipe" for stage 1 or 2 port job I would consider it for a off season project.
-I have searched the net for maps, but could only find stock port maps.
Kjell
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RD350 YPVS 1990
F2 converted to N2 Red/white 1986 - Figaroli pipes
RD350 YPVS 1990
F2 converted to N2 Red/white 1986 - Figaroli pipes
Re: 1990 F2 DIY porting
There is a port map on here from Slinger. Apparently it's good for 75whp.
I have ported my cylinders to match what he said, still awaiting firing the motor up to confirm. However, no one has said anything otherwise.
It is some aggressive porting though. Took me quite a while to get the job done, and I have the right tools!
I have ported my cylinders to match what he said, still awaiting firing the motor up to confirm. However, no one has said anything otherwise.
It is some aggressive porting though. Took me quite a while to get the job done, and I have the right tools!
Re: 1990 F2 DIY porting
If you're interested in tuning, I could offer my tuning manual.
Infos and samples can be found @ rd350.gmxhome.de
Infos and samples can be found @ rd350.gmxhome.de
Bye
Martin
Martin