so i finished reading minidragbikes post on flow v. comp. it got me thinking. with high comp and an untweaked cam you could run a reed valve to save some if not all of your blownback 'fuel'. i am starting to believe that this reed idea has more merit than i thought. look at a cv carb. the vacuum draws up the slide; the slide is just a different style of check valve. the needle is acting as a proportioning adjustable jet. when vacuum gets too low, it clamps down to keep from puking. it makes it like when you burp acid into your mouth without having the extra 'fuel charge being wasted. i looked up lobe centerline and saw that asymm lobes are ultra high end grinds. our big flat tappets/lifters would not accomodate such a design easily. that's when i remembered roller tappets. they would smooth out some of the friction, but people running them would have to change oil fairly often. so not an everyday upgrade. should be fairly simple to make but you would have to key them to keep them straight in the bore. take some longer lifters, (maybe 340-390 ones) remove the enough material to have a two-tined fork. making the rollers with a proper size/material to hold up is different. then you shoot an axle through the tines to hold your wheel. i've enquired of a few on this already, run a bigger in. valve with the stock rocker, while using a 1.3 or better on the stock ex. valve. btw, does anyone make bigger ratio rockers small enough for these engines? if these ideas have been covered, great. if not, even better. i will be thinking more on it.
roller tappets and other ideas
- Thread starter mike75925
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dpaxson
New member
if you're talking about a mikuni cv the slide isn't a check valve. it's controlled by the throttle cable. is that the part you're talking about?
cv's are vacuum driven slides. they take a different end on the cable. cv's are much like the stock honda gx carbs, except they do have a slide with needle valve. they have a throttle plate that is actuated by the throttle assem.
EagleTalons
Master JB Welder
You have transcended the boundaries of the paragraph as we know it... Interesting Ideas though.
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