Search found 474 matches

by GRIM
Fri Aug 07, 2009 1:01 am
Forum: Valveless pulsejet forum
Topic: Towards a wood fueled pulsejet
Replies: 339
Views: 39191

Re: Towards a wood fueled pulsejet

Nice Vid , Interesting and quite likely that the plate is in some way stabilizing the combustor , I think that "part" of the easier throttling and generally easier starting etc, is that you are gaining experience and getting the feel for propane , :wink: I have never used a needle valve in the propa...
by GRIM
Tue Aug 04, 2009 2:20 am
Forum: Valveless pulsejet forum
Topic: Towards a wood fueled pulsejet
Replies: 339
Views: 39191

Re: Towards a wood fueled pulsejet

That is fantastic ,Yes seems real close to 40hz and very steady, I have had the urge to have a go at a snorkeler for a long time , the truck breakers have all kinds of interesting tanks from the air brake systems on heavy vehicles I can see I am going to have to get some Methanol , :D Great stuff ,
by GRIM
Mon Aug 03, 2009 3:46 am
Forum: Off topic forum
Topic: my new (ol' but low cost) ride
Replies: 214
Views: 2843495

Re: my new (ol' but low cost) ride

Apparently I can't adjust the gas level accurately with either a scale or dial indicator calipers. I am not so sure that float level is that critical , on a motorcycle even gentle cornering will produce wild level changes , the figure in the manual is just a reference value, the jets do the meterin...
by GRIM
Sat Aug 01, 2009 10:59 pm
Forum: Valveless pulsejet forum
Topic: Towards a wood fueled pulsejet
Replies: 339
Views: 39191

Re: Towards a wood fueled pulsejet

Thanks for the video , :D Did you throttle it up more than that ? It should go a lot higher , if it wont then you have got a restriction in the fuel line, I never actually got mine to flame out , just got huge flames from the exhaust , I think the injector position although good for starting is very...
by GRIM
Sat Aug 01, 2009 8:22 pm
Forum: Valveless pulsejet forum
Topic: Towards a wood fueled pulsejet
Replies: 339
Views: 39191

Re: Towards a wood fueled pulsejet

Did anyone catch this , posted by Viv , viewtopic.php?f=10&t=5450

I thought immediately of a diaphragm, full auto reload , etc , of course nothing to do with this thread but amazing just the same
by GRIM
Sat Aug 01, 2009 8:18 pm
Forum: Off topic forum
Topic: my new (ol' but low cost) ride
Replies: 214
Views: 2843495

Re: my new (ol' but low cost) ride

Ha , float level deal , 8) I remember years ago a friend had a problem with a bike , would run for a bit, then run rough, then stop , cutting the long story short the little hole in the tank filler cap was blocked , but of course we changed just about everything out before we discovered that little ...
by GRIM
Sat Aug 01, 2009 2:51 pm
Forum: Valveless pulsejet forum
Topic: Towards a wood fueled pulsejet
Replies: 339
Views: 39191

Re: Towards a wood fueled pulsejet

CONGRATULATIONS , :D Makes sense now, hindsight... I have a smaller cc, therefore I need to restrict pipes more -- otherwise I just have a free-breathing burner. If however you restrict pipes, you reduce draft. So extend the draft pipe to compensate, increasing vacuum at inlet. Then it can climb out...
by GRIM
Sat Aug 01, 2009 3:38 am
Forum: Valveless pulsejet forum
Topic: Towards a wood fueled pulsejet
Replies: 339
Views: 39191

Re: Towards a wood fueled pulsejet

I also had a thought tonight that because the engine was sitting on rain wet sand instead of on legs, that maybe the bottom of the CC never warmed up to what it normally does on a free standing version. Maybe hot metal at the bottom of the CC is a big part of clean ignition and transitioning to pul...
by GRIM
Fri Jul 31, 2009 11:28 pm
Forum: Valveless pulsejet forum
Topic: Towards a wood fueled pulsejet
Replies: 339
Views: 39191

Re: Towards a wood fueled pulsejet

I think the injector is too close to the inlet, Yes you could be right about that ,being as the cc is smaller and its not centred , I remember that the injector position was quite touchy for starting , once running it was much more forgiving , It seems to work best if I angle the injector so it poi...
by GRIM
Fri Jul 31, 2009 6:17 pm
Forum: Valveless pulsejet forum
Topic: Towards a wood fueled pulsejet
Replies: 339
Views: 39191

Re: Towards a wood fueled pulsejet

Hey , yes the burp, I had forgotten all about that , when you have the injector close to the hole it does do that, a kind of rattle, fairly high frequency , I think its a bit of a jam jar thing , where it is pulling the flame in and out of the hole , What I found worked best was to light the injecto...
by GRIM
Fri Jul 31, 2009 3:52 pm
Forum: Valveless pulsejet forum
Topic: Towards a wood fueled pulsejet
Replies: 339
Views: 39191

Re: Towards a wood fueled pulsejet

Yes real close , try the injector at different angles , and depths , If it still wont go, lengthen the exhaust , some thin steel sheet and some hose clamps work , the joint doesnt have to be totally airtight ,
by GRIM
Fri Jul 31, 2009 3:19 am
Forum: Valveless pulsejet forum
Topic: Calculating top speed on ice...
Replies: 575
Views: 89340

Re: Calculating top speed on ice...

GRIM, or anyone else with experience of running the engine, do you find this engine especially difficult to start or is it easy to get it going once everything is tuned in? I will build a pair of M´s superdeluxe injectors before the next test to see if they make a difference. Hi Anders , Yes Thunde...
by GRIM
Fri Jul 31, 2009 3:11 am
Forum: Valveless pulsejet forum
Topic: Towards a wood fueled pulsejet
Replies: 339
Views: 39191

Re: Towards a wood fueled pulsejet

I built a slightly smaller version , using 1 1/2" pipe , I havent calculated the volume but I would guess that it was about 75-80% heres the link http://www.pulse-jets.com/phpbb3/viewtopic.php?f=3&t=5003&st=0&sk=t&sd=a&start=15#p59505 This was more difficult to start , required a sparkplug and compr...
by GRIM
Fri Jul 31, 2009 12:32 am
Forum: Valveless pulsejet forum
Topic: Towards a wood fueled pulsejet
Replies: 339
Views: 39191

Re: Towards a wood fueled pulsejet

Hi VR I wouldnt worry about the slightly smaller cc , it should work just fine , I also wouldnt worry much about the inlet and exhaust lengths either , this sounds just like a fuel /injector problem , If you drill a 1/4" hole in the top corner of the cc and push your injector in there it will start ...
by GRIM
Tue Jul 28, 2009 4:03 am
Forum: Valveless pulsejet forum
Topic: Towards a wood fueled pulsejet
Replies: 339
Views: 39191

Re: Towards a wood fueled pulsejet

Is that the line at the top of the cone? Yes , However I would forget the cone and ring for now and just get it up and running on a straight inlet, and yes it would be a very easy add on if desired , the ring is no more than a washer shape bashed in using a hammer and large socket, The bad (or at l...