More free plans: 40 pound Chinese

[metiz]

I'm working on a version of this engine with the intakes seperated 75 degrees instead of 180. The theory is that the opposing intakes create some unwanted effects in the engine making it a non or VERY hard starter. The 75 degree version should solve these problems, hopefully.

I do not have the tools to replace the intakes on my original version without messing it up or exeeding margins so I'm building a new one. Barry, your construction and welding skills are better then mine. If and when I get this version to work I'll release the plans for the new choke cone. If you want, you can then replace your original cone with the new one.

Below is a picture, courtesy of GRIM, that shows the new engine configuration. GRIM also supplied the layout for the new choke cone.

[Barry]

Hard too say,but there is something wrong with the plan.On 1 intake,mine running good.
I think also that the intakes are too big.
But you may cut 1 intake & close the hole with a piece sheetmetal.Just for testing it will be ok.

[metiz]

With one intake, the engine won't breath as well as with 2 so it will lose a lot of power. Furthermore, the tailpipe will be overexpanded with 1 intake making this engine worse still. The models suggest that this engine should run just fine with those intakes so I'm hoping it's a positioning problem (see picture on top of this page) I might be able to have the new version up and running this saturday. Time will tell

[Barry]

I'am already happy.....

[karel]

i know this is kinda of a "im-new-question", but, do you HAVE TO use injectors at the intakes? or could you leave the intakes free and insert an injector trough the CC? i've seen this work in lockwood-hiller's, so is there a chance this could work on th M40? I plan to build one myself, so I'd like to gather all possible info first.

[metiz]

The injectors do not necessarily have to go through the intakes. This is done 99% of the time because it's the easiest solution. You could feed straight into the cc but you will need some serious atomizing nozzles. I have no experience with that kind of fueling and even if I did, I can not guarantee that it will work.

If you plan on building this engine, wait until I have finished building and testing the new modifications (you have been following this thread right?) The engine as it is now appears to be a no- or ridiculously hard starter. I hope to fix this problem by repositioning the intakes

[karel]

I had a crazy idea, tell me if it could work hehe...
remember the pressure-jet fuel-line-heater with a 0.070' noozle diameter? could that somehow work, or would that be TOO MUCH propane for the air coming in? and could extra intakes to fix that air ratio problem be added?
I plan to build a valveless for my semester proyect at university...

[karel]

also, do you have a valveless plan for a big, powerful, easy (or better, self-) starting jet that has been proved succesful?

[metiz]

Well I'm not going to lie: I'd rely like to see you build this engine - after the mods et all, but if you want an even more powerfull engine, try the thunderchine. As for the pressure jet injector, that won't work in a pulse-jet. to fast.

[karel]

great, where do I find plans for the thunderchine? is it easystarting?
and oh's, would have been fun to have a supersonic injector in a pulse hahaha

[metiz]

well crap

you can find the plans on either the "calculating top speed on ice" topic or the thunderchine topic. be aware that there are multiple versions of this engine.

[metiz]

The new version is comming along nicely. All the cones are rolled and welded (except for the rectifier: managed to roll that one in the wrong direction) Just need to weld the lot up and it's done. Still on track for saturday testing.

[metiz]

Just need to weld this thing up, put the front dome on, inectors/ sparkplug and things like that and it's done

[Kool]

Nice work, Metiz

Are you planning to put an augmentor on it?

[metiz]

Are you planning to put an augmentor on it?

no