Boosted 2 Stoke
- Thread starter FearTheH
- Start date
here is your lesson for the day
1) carbon fiber reeds suck. they can not take the opening and closing well, they are too brittle and shatter. the steel lines reeds are able to flex better without too much troble.
2) not all pipes operated at the same RPM range. some are designed for lower rpm power and some are higher rpm power. meaning different powerband ranges.
3) for the turbo set up, i am sure the major turbo companies can help out. i know when i was talking to turbonetics when i was planning on doing a turbo on my zilla, they said they could get me the correct compresser wheel for the turbo of my choice.
4) EFI is not hard to tune when you have the correct stuff. just need a way to measure the a/f ratio and how to change the fuel pressure.
And the flux capacitor is under the seat in the air box so the air drawn through helps me keep the plutonium cool
1: I've never seen a carbon fiber reed shatter, fray, or malfunction. That's on my bikes, my friend's, or anybody I've ran into. As long as the weave is strong and the resin used is able to withstand heat, there shouldn't be an issue since carbon fiber is stronger/lighter than pure steel.
2: Not all pipes operate in the same range, but 2 strokes without powervalves even on "low end" pipes are operating at higher RPM ranges for the respective powerband than your common day 4 stroke and produce less torque.
3: I don't know the major turbo companies that work with raptors and all that jazz so I can't say.
4: When you have the correct stuff are the key words.
it isn't the strength that is the problem. it is the frequency of them opening and closing. banshee people break them all the time.
turbo need pressure to spin. the main down fall of 2-strokes and turbos. you need "overrev" ability. lots of pipes dont have this. they fall flat on their face at certain rpms. this will cause the turbo to lose boost, not good.
My guess is they were inferior carbon fiber designs and/or the reed cage no longer had the cushioned rubber seal on the cage causing it to impact on the metal of the cage. Carbon fiber has a VASTLY higher tensile strength to almost every kind of steel and steel alloy you can think of and one of the beauties of carbon fiber is it's ability to withstand the stress of bending.....it's actually one of the secondary reasons why reed manufacturer's use it aside form the fact that it's lighter.
i know way more about metal than you can think of.
it isn't the tensile strength that is the problem. it is the ability to flex or also known as modulus of elasticity or young's modulus. reason the steel lined reed are better because they can flex them return to their normal shape without much deformation.
"when you have the right stuff" "just need"
Words of someone who thinks rather than does...when you've got a EFI turbo'd anything then you can talk "just's" and "easy's"
As to the frequency of them opening and closing, does a banshee spin twice as fast as blaster? The magic 20K rpm banshee? Because it seems to me, as long as one reed cage feeds one cylinder then the frequency of it's opening and closing is directly correlated to the crank RPM and last time I checked a banshee and blaster turn about the same RPM and blaster motors don't "break them all the time" which tells me that it has less to do with the frequency of the reeds opening as it does something particular to a banshee...
"i know way more about metal than you can think of" Who in the heck are you, to think that you know more about metal than someone you don't know? You could be having an internet discussion with a descendant of Andrew Carnegie and has forgot more about steel than you will ever have the capacity to learn. He might be a metaurgist for US Steel right now... how do you know?
As for a blaster engine turning more RPM using a turbo vs NA... There is an absolute limit to engine RPM anyway you look at it. Piston speed will limit a blaster engine to 10.5K RPM's no matter how you are feeding the cylinder so it's not going to turn any more than that without grenading. You would have to purchase reeds which are reasonably strong to withstand some extra abuse but nothing extraordinarily strange.
Back to the original discussion, a turbo charged 2 stroke engine is possible but on the blaster, heat is your ultimate enemy. I would think that your best bet wouldn't be to turbocharge a blaster engine but perhaps a supercharger would be feasible. One of the small units you provided the link for would probably work well but there are still a few concerns even with that.
1) If you place a supercharger between the carburetor and cylinder, you're going to push the carburetor backwards towards the rear suspension (on a drag quad obviously that doesn't matter because you won't have a rear suspension anyway or it can be relocated if it's in the way)
2) Anytime you compress a gas, you increase its temperature. The wrong size supercharger will increase boost but will also increase intake charge temperatures to undesirable levels. This can be compensated for by changing the gear ratio of your drive chain (although if the supercharger is supplied pulley-less I would recommend changing it over to a cog belt)
3) tuning an EFI system is bunches of fun (and apparently about as difficult as walking and chewing bubble gum at the same time according to sheeblast) but running an EFI system on a blaster has it's disadvantages... With a cylinder mounted super charger a draw through carburetor becomes feasible and if you want it simple desirable).
Words of someone who thinks rather than does...when you've got a EFI turbo'd anything then you can talk "just's" and "easy's"
As to the frequency of them opening and closing, does a banshee spin twice as fast as blaster? The magic 20K rpm banshee? Because it seems to me, as long as one reed cage feeds one cylinder then the frequency of it's opening and closing is directly correlated to the crank RPM and last time I checked a banshee and blaster turn about the same RPM and blaster motors don't "break them all the time" which tells me that it has less to do with the frequency of the reeds opening as it does something particular to a banshee...
"i know way more about metal than you can think of" Who in the heck are you, to think that you know more about metal than someone you don't know? You could be having an internet discussion with a descendant of Andrew Carnegie and has forgot more about steel than you will ever have the capacity to learn. He might be a metaurgist for US Steel right now... how do you know?
As for a blaster engine turning more RPM using a turbo vs NA... There is an absolute limit to engine RPM anyway you look at it. Piston speed will limit a blaster engine to 10.5K RPM's no matter how you are feeding the cylinder so it's not going to turn any more than that without grenading. You would have to purchase reeds which are reasonably strong to withstand some extra abuse but nothing extraordinarily strange.
Back to the original discussion, a turbo charged 2 stroke engine is possible but on the blaster, heat is your ultimate enemy. I would think that your best bet wouldn't be to turbocharge a blaster engine but perhaps a supercharger would be feasible. One of the small units you provided the link for would probably work well but there are still a few concerns even with that.
1) If you place a supercharger between the carburetor and cylinder, you're going to push the carburetor backwards towards the rear suspension (on a drag quad obviously that doesn't matter because you won't have a rear suspension anyway or it can be relocated if it's in the way)
2) Anytime you compress a gas, you increase its temperature. The wrong size supercharger will increase boost but will also increase intake charge temperatures to undesirable levels. This can be compensated for by changing the gear ratio of your drive chain (although if the supercharger is supplied pulley-less I would recommend changing it over to a cog belt)
3) tuning an EFI system is bunches of fun (and apparently about as difficult as walking and chewing bubble gum at the same time according to sheeblast) but running an EFI system on a blaster has it's disadvantages... With a cylinder mounted super charger a draw through carburetor becomes feasible and if you want it simple desirable).
To the O. P. , if you have the turbo, slap that puppy on there. Weather SC, Turbo, or FI, were such a great idea, it would be way more common on Blasters and Banshees. Never said it wasn't possible to do any of this to either machine, but is it practical ?? $8600 SC banshee??
In light of half these mods that are available for these things is any of it really practical? Do we really need to max these things out by boring .080 over and so forth? Is it completely necessary? I think not...so I say if I can do this then i want to do it haha.
