Engine tuning/ bike build
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@arild said in Engine tuning/ bike build:
80 pounds to rebore the cylinder
£80 for a rebore is very expensive, Mick Abbey charges £25 for a
rebore and hone and postage abroad is only £10 as done a few
cylinders for overseas customers.@theportingmaster
Thats a really good price, what shipping company were u using?? -
been a while, ive just recently started doing some work on the bike again, took a long break over the winter, you lose the will to work on the bike when its negative degrees in the garage.
Ive been getting some stuff going this past week, I was able to go over to my neighbours company/workshop where he had a lathe i was able to use. So I threw together an adapter that is slipfitted over the cylinder skirt, which then centers up in a simple 3-jaw chuck lathe, I did this cause I didn't have access to a four jaw, but that's ofcourse the preferred method to go. I then skimmed and bored the barrel, still have lots to go cause I think a piston had exploded in that barrel before so there's a lot of material missing over the exhaust port.
https://i.imgur.com/LhPCUF0.mp4
https://i.imgur.com/usIIdnO.mp4
Some vids I took at the lathe.I also just last night finished up making a port map for my 3mb barrel, I later printed it, cut everything out and used it as a porting guide
As you can see I added some 8mm auxiliary exhaust ports.
I then just started porting, the only tools I had to use was a normal dremel with a flexshaft and some carbide and diamond burs aswell.
Ofcourse its not even close to a perfect port job, but it being my first time without and real porting tools I'm really happy with the result, its not finished yet, the ports need to be cleaned up, barrel needs a rebore which ill do in the lathe this week and the exhaust port needs to be polished cause it got some dings from the dremel. I went conservative with this first iteration, they open at 188 degrees, my main port opens at 200 degrees. Its just a test and if they need to be higher ill raise them a tiny bit.
I then also need to attack the power valve to get passages for the gases to flow through that aswell.Some other stuff I've been working on is an airboot for my 32mm carb so I can use the stock airbox, the opening for the carb is 55mm compared to the roughly 38mm stock carb and boot. No matter how much heat or force used it didn't fit.
My tacho fixture on the case had also been stripped so took an hour to mock a new model up in solidworks so I could 3dprint
I was also able to pick some wr426f forks up for free, however the shape they're in isn't the best, the aluminium has corroded and pitted all over the fork tubes, its nothing deep tho so its only visual, so whenever I get a front axle for it and get the bearing cup made I'm chucking them on aswell
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been a while, ive just recently started doing some work on the bike again, took a long break over the winter, you lose the will to work on the bike when its negative degrees in the garage.
Ive been getting some stuff going this past week, I was able to go over to my neighbours company/workshop where he had a lathe i was able to use. So I threw together an adapter that is slipfitted over the cylinder skirt, which then centers up in a simple 3-jaw chuck lathe, I did this cause I didn't have access to a four jaw, but that's ofcourse the preferred method to go. I then skimmed and bored the barrel, still have lots to go cause I think a piston had exploded in that barrel before so there's a lot of material missing over the exhaust port.
https://i.imgur.com/LhPCUF0.mp4
https://i.imgur.com/usIIdnO.mp4
Some vids I took at the lathe.I also just last night finished up making a port map for my 3mb barrel, I later printed it, cut everything out and used it as a porting guide
As you can see I added some 8mm auxiliary exhaust ports.
I then just started porting, the only tools I had to use was a normal dremel with a flexshaft and some carbide and diamond burs aswell.
Ofcourse its not even close to a perfect port job, but it being my first time without and real porting tools I'm really happy with the result, its not finished yet, the ports need to be cleaned up, barrel needs a rebore which ill do in the lathe this week and the exhaust port needs to be polished cause it got some dings from the dremel. I went conservative with this first iteration, they open at 188 degrees, my main port opens at 200 degrees. Its just a test and if they need to be higher ill raise them a tiny bit.
I then also need to attack the power valve to get passages for the gases to flow through that aswell.Some other stuff I've been working on is an airboot for my 32mm carb so I can use the stock airbox, the opening for the carb is 55mm compared to the roughly 38mm stock carb and boot. No matter how much heat or force used it didn't fit.
My tacho fixture on the case had also been stripped so took an hour to mock a new model up in solidworks so I could 3dprint
I was also able to pick some wr426f forks up for free, however the shape they're in isn't the best, the aluminium has corroded and pitted all over the fork tubes, its nothing deep tho so its only visual, so whenever I get a front axle for it and get the bearing cup made I'm chucking them on aswell
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@arild Lovely bud!
Are you going to make match holes in the powervalve as well? Or are you running open port?
@calum I havent really decided that yet, i want to be able to run the pv but I'm not sure how to do it with the auxiliaries in a good way, ideally id like the ports to stay closed and open up with the rest of the valve, idk how well that will work tho so I might just resort to having the open all the time
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@calum I havent really decided that yet, i want to be able to run the pv but I'm not sure how to do it with the auxiliaries in a good way, ideally id like the ports to stay closed and open up with the rest of the valve, idk how well that will work tho so I might just resort to having the open all the time
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@arild Added boost ports and modified powervalve to suit, can
upload port maps to add boostports.
@theportingmaster that looks pucker mate!
Let us know how the bike rides after.
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@theportingmaster that looks pucker mate!
Let us know how the bike rides after.
@calum Will be getting it dynoed at Mick Abbeys in a couple of weeks so will upload dyno results and video of its power run once
sorted. cheers Terry -
@calum Will be getting it dynoed at Mick Abbeys in a couple of weeks so will upload dyno results and video of its power run once
sorted. cheers Terry@theportingmaster
that's looking real good mate, certainly way better than my porting -
Would Boosted port 3mb cylinder work if im having DEP exhaust and 30mm chinese PWK? Would i get noticeable power gains? I have an friend who could port the cylinder and make boost ports.
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Would Boosted port 3mb cylinder work if im having DEP exhaust and 30mm chinese PWK? Would i get noticeable power gains? I have an friend who could port the cylinder and make boost ports.
@detsinomistaja He also could modify them YPVS flanges to work with boost ports.
