Has anyone designed an engine from scratch?

[etusch]

There was a kid who designed a V6 from scratch and posted renders of it. Dunno if he is still about or ever got further than renders.

Don't think he had planned for high rpm.

he was @glenntws. he had good innovative ideas about engines.

[etusch]

On the website cnczone, there was a subforum on miniature internal combustion engines, there was thread from maybe 2001 era? A guy built a motorcycle engine based on bore stroke of an f1 motor, maybe 96x42 or so. He got it running, he went quiet after that. This was at the height of the V10 f1 horsepower wars when rpm and hp kept shooting upwards, we were all hooked.

I have 2 complete cbr954 heads, im hope to build a hillclimb 2 litre v8, but wife wants wife things and no cigar until maybe December, maybe i can do the casting patterns in the down time.

That sounds awesome! ill have to look that one up on CNCzone.

I also have a CBR250 and that revs up to 19k RPM and it sounds like a miniature F1 car. It runs on valve springs but it's such a small engine and the components are so light, it works. With a larger displacement comes larger valves hence having to move to pneumatic valves. There have been other engines that have been made using motorcycles engines, but they have been small displacements that rev high but as the displacement gets higher the RPM gets lower such as the Hayabusa engine 10k RPM?

wow. 19 k with single cylinder! I also have some ideas but I don't know if I could do it or will it work. At single cylinder I think 2 stroke is best.

[Billzilla]

wow. 19 k with single cylinder! I also have some ideas but I don't know if I could do it or will it work. At single cylinder I think 2 stroke is best.

I suspect he means the original - and by far the best - CBR250RR. They are a four cylinder 250cc and the factory redline is 19,000 rpm. I used to own one and with a rather large me on it, it wasn't very fast but oh my did it sound good.

[coaster]

Found a blog by an italian who made a 5 cylinder version cbr250rr in a replica of a RC161 Honda tt, very little to find there, not as well documented as Millyards masterpiece.

http://inspiration-mv3.jlsp503.over-blog.com

Lots of ads.

[coaster]

This 5 cylinder is a 120 degree crankshaft
1+5 (120) 2+4 (120) 5 (120)
unlike the Hayabusa 5 with
1+4 (90) 5 (90) 2+3 (180)
both are flawed by way of balanced mass, Millyard built a single plane 3 cylinder
1+3 (180), 2 (180)
and corrected the imbalance by increasing mass in the odd cylinder.
Both Cbr5 and Busa5 appear not to have taken this step retaining the stock mass.

[Greg Locock]

Uneven firing order doesn't mean lack of primary balance. Perhaps you are referring to secondary imbalance, ie L/R inertia forces?

[coaster]

I can grasp the 120 odd fire because the odd fire is at centre of the rotating mass, but the 90,90,180 has the odd fire at one end of the rotating mass setting up some unusual forces.
Millyard keeps his oddfire in the centre as does the honda v5 motogp.

[godspeed]

wow. 19 k with single cylinder! I also have some ideas but I don't know if I could do it or will it work. At single cylinder I think 2 stroke is best.

I suspect he means the original - and by far the best - CBR250RR. They are a four cylinder 250cc and the factory redline is 19,000 rpm. I used to own one and with a rather large me on it, it wasn't very fast but oh my did it sound good.

Yes, that's correct. The original CBR250RR mine is 1990.

There was a kid who designed a V6 from scratch and posted renders of it. Dunno if he is still about or ever got further than renders.

Don't think he had planned for high rpm.

he was @glenntws. he had good innovative ideas about engines.

Thats for that! I'll have to look him up and see if I can find anything on his engine.

Well were in lockdown again and im bored, so here comes a casting pattern build. This model is not there yet, will use pvc tubes, plywood and bondo for the mold.

Keep up the good work! cant wait to see what you come up with!

[Cold Fussion]

Thats for that! I'll have to look him up and see if I can find anything on his engine.

memberlist.php?mode=viewprofile&u=36928

He hasn't posted on here for a couple of years though.