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Post by 3strokeengine on Oct 23, 2020 23:23:56 GMT -5
I've posted to this fourm in the past regarding my 232 gy6 build all specs posted here: 49ccscoot.proboards.com/thread/25674/all-out-232-taidia-buildSince then I've put about another 1000km on the engine and and feel confident in the durability of the block to start playing with power adders. Now I know fully well I WILL push this engine too far and it WILL puke its guts out all over the ground and probably cover the rear tire in oil and ill lay the bike over but I shall cross that bride when I get there, I'm aware of the risk. As for the choice of power adder the only option that makes sense to me on a scooter is nitrous oxide. Obviously in the current setup with a carbuetor i will need to run a wetshot setup (that is the extra fuel needed with the extra oxygen N20 brings to the party is mixed before its injected by the spray bar). It's essentially impossible to get a carburetor to run right with a dry shot. If anyone has any experience with nitrous and small engines I'd be interested in discussing it further. For example there needs to be a way to retard ignition timing as the nitrous button is pressed, not possible with a stock CDI setup... Anyways heres of a video of the current running performance of the engine on 112 octane fuel. I pulled to around 9500 RPM which is somewhere around 65+ MPH and thats about the limit of control ability past that speed you need 2 hands on the handle bars because the chassis gets horrible death wobbles above 70mph youtu.be/IGs5rFqJTuI |
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mikeh
Scoot Member
Posts: 59
Location: Bradenton, FL
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Post by mikeh on Oct 24, 2020 9:11:09 GMT -5
Insane power. I'm actually looking to move from my 47mm bbk 50 to a 150-200cc class. I need to be able to keep up with local traffic which means I need 50+ mph speeds.
What is the original base of this build?
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Post by 3strokeengine on Oct 24, 2020 13:42:42 GMT -5
Insane power. I'm actually looking to move from my 47mm bbk 50 to a 150-200cc class. I need to be able to keep up with local traffic which means I need 50+ mph speeds. What is the original base of this build? I bought the case parts in pieces from Tadia. This is B case with the 57mm stud spacing. Essentially it came as a bare aluminum block with no bushings bearings or seals installed. All built from the ground up. This bike originally came with a 150cc GY6. That motor got built up to a 172cc then I sold it to go with the 232cc build. The A case blocks only support up to 205cc due to the narrower stud spacing. A properly running 172cc gy6 should make about 15 horsepower. Plenty enough for 55mph cruise speeds depending on your gear ratio, with the stock gears your gunna be spinning some high RPMs to maintain those speeds. |
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Post by CrankingWithCG on Oct 24, 2020 20:59:15 GMT -5
I second this. My built 155 can kinda cruise around 40 to 45, to sit at 55 is to be somewhere between 6500 and 7000 rpms screaming. A 171 would be nice 😂. And Ill say if you wanted to go a little more bold, an amr300 or most likely a smog pump supercharger ran off the flywheel nut somehow, but nitrous seems more reasonable
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Post by 3strokeengine on Oct 25, 2020 4:54:46 GMT -5
I second this. My built 155 can kinda cruise around 40 to 45, to sit at 55 is to be somewhere between 6500 and 7000 rpms screaming. A 171 would be nice 😂. And Ill say if you wanted to go a little more bold, an amr300 or most likely a smog pump supercharger ran off the flywheel nut somehow, but nitrous seems more reasonable I wouldn't be too concerned with RPM these small displacement engines, they'll run high rpm for as long as it stays cool. Obviosuly bigger heavier piston means more stress at high RPM. Now with all that said I do typically do a max cruise at 8,000 RPM sustained on the 232 motor which with the gear ratio and 10 gram variator weights nets about somewhere in the low 60mph range at that RPM. A 45 mph cruise is more along 6500 RPM under light throttle input. And I got only slighter higher gears than stock I forget the ratio at the moment |
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Post by CrankingWithCG on Oct 25, 2020 6:34:23 GMT -5
I second this. My built 155 can kinda cruise around 40 to 45, to sit at 55 is to be somewhere between 6500 and 7000 rpms screaming. A 171 would be nice 😂. And Ill say if you wanted to go a little more bold, an amr300 or most likely a smog pump supercharger ran off the flywheel nut somehow, but nitrous seems more reasonable I wouldn't be too concerned with RPM these small displacement engines, they'll run high rpm for as long as it stays cool. Obviosuly bigger heavier piston means more stress at high RPM. Now with all that said I do typically do a max cruise at 8,000 RPM sustained on the 232 motor which with the gear ratio and 10 gram variator weights nets about somewhere in the low 60mph range at that RPM. A 45 mph cruise is more along 6500 RPM under light throttle input. And I got only slighter higher gears than stock I forget the ratio at the moment That sounds like a dream! Yeah, i just dont wanna hold it at a high rpm of it doesnt make power up there. She aint no two stroke! 😂 That said, my rpms hardly ever pass 7000. So something's up |
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Post by 3strokeengine on Oct 25, 2020 19:22:43 GMT -5
I wouldn't be too concerned with RPM these small displacement engines, they'll run high rpm for as long as it stays cool. Obviosuly bigger heavier piston means more stress at high RPM. Now with all that said I do typically do a max cruise at 8,000 RPM sustained on the 232 motor which with the gear ratio and 10 gram variator weights nets about somewhere in the low 60mph range at that RPM. A 45 mph cruise is more along 6500 RPM under light throttle input. And I got only slighter higher gears than stock I forget the ratio at the moment That sounds like a dream! Yeah, i just dont wanna hold it at a high rpm of it doesnt make power up there. She aint no two stroke! 😂 That said, my rpms hardly ever pass 7000. So something's up What camshaft are you running? Stock cams have short duration and aren't good for top end |
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Post by CrankingWithCG on Oct 25, 2020 20:05:19 GMT -5
That sounds like a dream! Yeah, i just dont wanna hold it at a high rpm of it doesnt make power up there. She aint no two stroke! 😂 That said, my rpms hardly ever pass 7000. So something's up What camshaft are you running? Stock cams have short duration and aren't good for top end A9. The guys at the ruckshop said the a12 is better, but i dunno. I feel like im not tapping into the cam at the high rpms |
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Post by 3strokeengine on Oct 25, 2020 20:19:46 GMT -5
What camshaft are you running? Stock cams have short duration and aren't good for top end A9. The guys at the ruckshop said the a12 is better, but i dunno. I feel like im not tapping into the cam at the high rpms The A12 has a tighter lobe separation angle and make more peak torque but A9 is the best for high RPM or the elusive A8. An A9 cam with a 30mm carb and good exhaust and cylinder head should be good for 9-10k RPM top end runs. What gram rollers are you running? 9 to 11 grams is best for an A9 camshafts power band in my experience |
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Post by CrankingWithCG on Oct 25, 2020 20:44:04 GMT -5
If i had to guess, id say 12g. When i say never gets above 7k, theres been maybe twice its gotten over 7000. I think my exhaust and stock head are limiting it. Its ported, but i really just smoothed transitions, not much more
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