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ok, well just an update: i've done the DXF drawings for the crank case that these big-bore kits will bolt onto. i used python (!) and a module called sdxf.py and i've created the crank case as 4...

allo uuu,

ok, hmmm, what do you think: the air-fuel mixture is going to be rushing in just as the exhaust is being cleared, all ports are open, and the spark fires. i'm a bit concerned about...

yes - i didn't want a dynamo (aka magneto) but i'd heard about these magnetic-triggered relays, to which the coils are connected (and normally a magneto on the other side). apparently they're quite...

will do. i'm expecting some spectacular youtube videos as well as some successful ones. but yes, first i'm going to keep the C/R at the same, just arrange the cams to give a longer dwell time at...

well, the pistons arrived: uuu, good call there. they're simple standard 70mm "big bore" scooter 2-stroke kits, and their use has saved me quite a lot of time, effort and messing about - so thank...

i did try telling my friend and associate that! i will now kick him into submission with what you've said :)



thanks richard. revetec's design manages a dramatic improvement: they got around...

yes i do. i found that stuff about... 8 months ago, and have moved on from there :)

word of warning: the guy behind the bourkeengine.com web site has some psychiatric problems, as you can...

btw, i thought this might be worth sharing, for sheer mind-boggling hilarity. i can't quite get over the numbers, here.

even assuming there's no performance gain from this rather strange design:...

ok, uuu: i liked the idea of finding a pre-existing motorbike engine so much that i went "hmm, what about 50cc scooter 2-stroke engines?" and well that led me to look on ebay and i accidentally...

star, richard. really appreciate the pointer.

i'd heard about piston rings that are angled so that when it all goes "bang" the pressures push them harder against the side-wall. the tapered cylinders (no rings) had me pause for a second though. ...

oo good find, mark. that lead me to some 55cc DLE engines which are close to what i need, i could consider buying those off-the-shelf instead and their pistons, save me making them. do you - or...

allo mr packrat,

apologies first, to you (and all!) - i didn't realise this was an ongoing discussion, cnczone hadn't sent me a message in a while!

ok, i've been doing a bit more research and a...

oo, that's really valuable advice, saves me some searching and research for options. thank you.



sleeve bearing. yes. although, i heard recently that up until 20 years ago jaguar were still...

ok - so, can i ask you: could you tell me more about this? i wasn't aware of it. it makes sense though. would a taper still be necessary in a small cylinder of bore 40mm or 50mm?

l.

bluejets, hi, many thanks for this. the difference between this 2-stroke ported design and a steam engine is, surprisingly, not very great. apart from the "bang" bit. if i'm going to the trouble...

uuu, thank you for this. how did you derive this? 63.7-50 is a full 13.7mm which seems to be a heck of a lot. ok, so add 50 to 63.7, you get 113.7. 113.7 divided by 13.7 is 8.3 - is that the...

yes. there's some cross-posting here. i have the original designs and patents, plenty of photographs. and the.... wait... what? :) taper? on the cylinder?



... detonation's exactly what's...

ah ok sorry that's down to the unclear (unannotated) diagram. each cylinder is not double-ended: the underside chamber is used as a mixing chamber, just like in any ported 2-stroke engine. i...

packrat, hi,

after thinking overnight rather my initial puzzled immediate reaction to what you wrote: i'm going to say this - briefly - once - then i'm going to ignore any other questions or...

uuu, thank you for responding here.



ah - now here's where my inexperience comes in: i need it to be about 125cc per cylinder. so... the stroke would need to be about 65mm not 50, to do that -...

i did. i have. for several months. i am good at 3 dimensional analysis and physics. it works. i have also read up on the chemistry, and it's consistent enough to be convincing as well (even...

folks, hi,

i've just joined this forum because i'd like to make an engine... from scratch, and whilst i am a software engineer, used to make my own lego model designs, did metalworking at O'Level...