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Post by x7rocks on Feb 11, 2022 18:01:30 GMT -5
That looks and sounds amazing. 🤩 Thank you sir. The 100 is definitely looking like an overlooked engine. There is potential. An this wasn't exactly bank breaking either |
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Post by x7rocks on Mar 19, 2022 13:58:37 GMT -5
With the new exhaust I found 7 gram rollers to get me very close to what seems like peak power. As when I'm going around 35 or so there is a slight overrev where power just surges even more.
But I am finding the vw auxiliary pump to be running a bit higher Temps at lower speed (most likely due to the higher rpms) so I will have to test how it controls the Temps at cruising speed here in Florida (55-60) mph range.
Will get a video up soon.
It won't be the same quality of gtvert but just showing how it runs at the moment.
I'm starting to think the 100 is an overlooked engine for all the wrong reasons.
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Post by fly on Mar 20, 2022 2:03:13 GMT -5
With the new exhaust I found 7 gram rollers to get me very close to what seems like peak power. As when I'm going around 35 or so there is a slight overrev where power just surges even more. But I am finding the vw auxiliary pump to be running a bit higher Temps at lower speed (most likely due to the higher rpms) so I will have to test how it controls the Temps at cruising speed here in Florida (55-60) mph range. Will get a video up soon. It won't be the same quality of gtvert but just showing how it runs at the moment. I'm starting to think the 100 is an overlooked engine for all the wrong reasons. It's there a thread with side by side comparisons of the 50 and 100 cases? What's different? The things like cylinder head bolt spacing, what's the diff? what else? Is there more volume in the crank case? Made for longer stroke? I know woefully little about those cases. Curious what of the 50 stuff fits and what doesn't. |
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Post by x7rocks on Mar 20, 2022 8:24:05 GMT -5
With the new exhaust I found 7 gram rollers to get me very close to what seems like peak power. As when I'm going around 35 or so there is a slight overrev where power just surges even more. But I am finding the vw auxiliary pump to be running a bit higher Temps at lower speed (most likely due to the higher rpms) so I will have to test how it controls the Temps at cruising speed here in Florida (55-60) mph range. Will get a video up soon. It won't be the same quality of gtvert but just showing how it runs at the moment. I'm starting to think the 100 is an overlooked engine for all the wrong reasons. It's there a thread with side by side comparisons of the 50 and 100 cases? What's different? The things like cylinder head bolt spacing, what's the diff? what else? Is there more volume in the crank case? Made for longer stroke? I know woefully little about those cases. Curious what of the 50 stuff fits and what doesn't. Cylinder stud spacing is different. The crank is 47mm stroke and Has an ignition taper similar to a jog 4dm 90cc. The factory clutches are 112mm, rear pulley is 122mm, front pulley stock is 99mm but the malossi brings that up to 105mm. Gearing I believe is different, but share the same wheel as a zuma 50 bws100 and aerox 100 wheels fit and maybe a few other models like a benelli k2 100cc also uses the 4vp. Not entirely sure how much case volume it has. But certainly has enough space inside it to fit such a large crank. As far as parts interchanging so far the main thing I'm using from a 50cc engine is the Reed block and mvt ignition. Not sure if many or any 70cc style exhaust will fit as the cylinder length is much longer making the need for new mounts (tried to mount a roost 70 exhaust just to see how fitment would be) |
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Post by fly on Mar 22, 2022 7:57:28 GMT -5
Some day I'm really going to need to track some down. With what you've achieved, it's pretty apparent it's a really good base for somebody with the skills to build off. I've had to modify so much for stuff "made" for the 50cc cases I've got the bug for builds that don't just bolt on!
Question: Do you think you could make an adapter to run cylinders made for the 50cc case? Any of these cranks that need boring fit in there without having to cut? Wondering if they could be made to run with the XL bores for the 50cc.
It's pretty rad you get that huge clutch. I wonder if there's a rear pulley out of something else that's slightly bigger that might fit with a bearing swap.
FWIW, every time I'm in the metal store I'm looking at the big hunks of aluminum and brainstorming *making* a case. The 8.1 cases aren't all that special. Anyway, that's another thread and I don't want to derail.
But I'm curious what your thoughts are about retrofitting XL bores and associated cranks.
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Post by x7rocks on Mar 22, 2022 10:57:25 GMT -5
Some day I'm really going to need to track some down. With what you've achieved, it's pretty apparent it's a really good base for somebody with the skills to build off. I've had to modify so much for stuff "made" for the 50cc cases I've got the bug for builds that don't just bolt on! Question: Do you think you could make an adapter to run cylinders made for the 50cc case? Any of these cranks that need boring fit in there without having to cut? Wondering if they could be made to run with the XL bores for the 50cc. It's pretty rad you get that huge clutch. I wonder if there's a rear pulley out of something else that's slightly bigger that might fit with a bearing swap. FWIW, every time I'm in the metal store I'm looking at the big hunks of aluminum and brainstorming *making* a case. The 8.1 cases aren't all that special. Anyway, that's another thread and I don't want to derail. But I'm curious what your thoughts are about retrofitting XL bores and associated cranks. I think the jog90 is probably the base as to why there are so many large bore kits as all the crankshaft seem to fit them with no crank work required. Like physically you can install a 52mm bore from a jog 90 to a bws50 engine with no cylinder stud issues as they're the same(minus some crank case mods and modifications to the bore by shaving the barrel down for the 39mm stroke). While the bws100 is just entirely different cylinder stud spacing. The crank, I'd have a worry about using on a bws50 crank case as it uses (not necessarily a bad thing) a large 14mm wrist pin which may make finding pistons a hassle. But I believe someone stated they fitted bws100 crank to their engine on this site? And funny enough I cannot find it for the life of me. But someone made an adapter for their bws 100 engine to run a yamaha yz85 cylinder. They used a plate similar to how the stage 6 r/t cylinders use a baseplate and a custom exhaust. It worked really well in the video but it seems to have disappeared the day I tried searching for it again. |
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Post by fly on Mar 22, 2022 12:36:18 GMT -5
Well, I was wondering if using 50cc case stuff in the 100 case works, not the other way around. I think the 2Fast 100cc kit uses a 14mm wrist pin bearing, and several of them have a 47mm stroke for the 100cc cylinders. I'm wondering if they would fit, and if you could adapt the 100 deck to take the 50mm spacing of the 50cc based cylinders. Like the custom base plate you mention.
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Post by x7rocks on Mar 22, 2022 13:56:50 GMT -5
Well, I was wondering if using 50cc case stuff in the 100 case works, not the other way around. I think the 2Fast 100cc kit uses a 14mm wrist pin bearing, and several of them have a 47mm stroke for the 100cc cylinders. I'm wondering if they would fit, and if you could adapt the 100 deck to take the 50mm spacing of the 50cc based cylinders. Like the custom base plate you mention. I'm sure with some creativity it should work. I'm not sure what the conrod length is for the 2fast 47mm crank or even the stock conrod for the 100cc minarelli block, but it's if someone was able to make a yz85 topend on a stroked bws100 engine (from what I gathered at the time it used a 52mm stroker) to work. Actually makes me wonder if an rc one style cylinder would be easier to work with? |
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Post by x7rocks on Mar 22, 2022 19:05:51 GMT -5
youtu.be/cQCnWyeVE6QGot a video to share with you guys. You can hear that I'm just barely getting into the powerband. I think I'll throw in some 6.8 to see if it gets me to where I need to.
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Post by x7rocks on Apr 12, 2022 18:53:56 GMT -5
Small update. Mixed the 3 6.8 rollers and 3 7.0 rollers. An that's the perfect number. Right into the powerband to the point you feel the front end just feel light when accelerating.
Definitely a game changer. But may need ideas for a stronger waterpump.
But will get a video soon. Got a new job at Wheels lab inc where I work on those little electric rental scooters. But this does mean a bit more funding for cool stuff
Next mod. Malossi 128mm rear pulley. Hopefully i don't need to cut too much from the cases.
😎
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Post by x7rocks on Apr 17, 2022 14:24:27 GMT -5
So I scooped up this stage6 waterpump for 160 usd. Lol jk. Found it on Amazon for 59 dollars shipped with next day delivery. From what I understand the flow is much higher so I'm hoping it keeps the engine cooler since it now revs at a higher rpm. But here's a pic to show how tiny this thing is.   |
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Post by x7rocks on Apr 17, 2022 14:34:22 GMT -5
Also it seems I still could work on some very small dead spots in my acceleration. 6.8 weights with 11 gram malossi weights. Vs the 3x 6.8 and 3x 7.0 gram weights  
So maybe a smidge lighter weights. Maybe throw in some more 6.8 gram rollers and adjust the clutch to higher launch settings (haven't done this yet as I really wanted to get the vario weights done first) |
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Post by x7rocks on Apr 18, 2022 9:19:36 GMT -5
Got another video to share with you guys  gonna give the Bosch waterpump a shot today when the pig tail connection arrives. youtu.be/QvdGUCFcTBgI actually want to ask a question. Should I have the flow go from radiator to the head or draw from the head to the radiator like I have it now? I ask if it would make a difference as it would be easier to prime the radiator system if the pump sucked from the primary radiator and flow outward from the head rather than going into the head as it was previously set up. Any thoughts? |
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Post by 190mech on Apr 18, 2022 17:19:51 GMT -5
Pump draws cooler water from the bottom rad hose and pushes it into the lower cylinder duct,then the hot water leaves the head and goes to the top rad hose..
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Post by x7rocks on Apr 18, 2022 17:23:23 GMT -5
Pump draws cooler water from the bottom rad hose and pushes it into the lower cylinder duct,then the hot water leaves the head and goes to the top rad hose.. Went ahead and did it that way and see a big difference in idling Temps. Gonna try and get as much air out of the system, seems much easier this time around than the way it was routed before. |
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gonna give the Bosch waterpump a shot today when the pig tail connection arrives. 
