hoser wrote:
nitrosport_5 wrote:
hoser wrote:
This help any?
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That was a good read, but do you have any pictures of the finished product? or maybe any in progress shots? I am just a little bit afraid to take power tools to the intake. I guess on the bright side, they can be had cheap on ebay if i screw it up.
Cant find any pics of the finished can you mark up where you want to match up maybe I can add some pointers and advice.
Miss matched parts cost flow, you only have to much time that the port is open and flow happens so you want the least amount of losses as possible, at high RPMs it happens so fast its almost like a steady flow but their is still a pulse involved how ever so short.
You can get a idea of flow effects by taking two matching parts and flowing water over them then slowly miss align the parts so they no longer match then watch flow again.
Air flow is slightly different because of its density same with air/fuel and slightly different with air/fuel/2 stroke oil but you get the idea, big miss match = restricted flow or turbulence and eddies that affects flows.
On the rotary valve intake engines you don't want to change the timing of the openings because it will adjust your power band, like in the below pic where I added the red lines that is how the rotary valve cover will sweep around go to the other side of that red line it will alter the time your intake is open.
If you want to vary the amount of time your intake is open you cut the rotary valve itself or but a different valve already cut.
All i had wanted to do was just match what the factory 670 SKIdoo intake had for porting. I didnt want to change the timing or any of that, just put it to factory.
This photo shows what the SEAdoo intake looked like when i started, the ports were just round. The red markings are just a rough outline of what needed to be cut to match the ports of the crankcase.
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2012-01-17_18-12-04_20.jpg [ 41.36 KiB | Viewed 3609 times ]
This next photo shows my intake after i did a little work to it next to the stock SKIdoo intake. I have never done this sort of work before so i just gave it the best shot i could. My modified intake is on the left, the stock SKIdoo intake is on the right
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2012-02-27_22-57-47_898.jpg [ 63.44 KiB | Viewed 3609 times ]
Not sure if i went about that correct but it is at least better than it was. Maybe you could give me a few ideas if it needs modified more. I was going to polish it a little better smooth.
fully wrote:
My bad I thought your was the one on the right.
Its all good. It was my first time doing somthing like this so i am open to input. Just thought maybe you saw somthing that i didnt.