In general the calculation for a turboed piston engine is 9.5 to 10.5 lb/min of flow per flywheel horsepower. Has anyone any idea what the figures are for a turboed rotary?
Kevin
1.92 CFM per 1 RWHP
at what pressure and temp is that ? volumetric flow rates are fairly meaningless.
my thaughts exactly ;)
volumetric flow rates are also dependent upon rpm and throttle configuration; hence, volumetric efficiency
Steve
There will be some sort of general figure out there though, which is all i was after. No engine runs the same day to day,i was just after a ball park figure which it looks like Scott has come up with.
Kevin
CFM isn\'t a good measure though as it will vary through the engine whereas massflow is almost constant from the air intake to the exhaust.
whats it all for anyway Kev :)
Rotary engine is going to be pretty much the same as a piston engine, maybe a bit higher as the engine is less efficient. If you went for 12 lb/min I doubt you\'d go far wrong.
i concur.
Talking about stock motors of course.
:)
well a
GT42R flowing 84 lbs a min in a stock port rotary flows 1234 CFM this equates to 643 whp ish.
stock twin flows about 50lbs of air at peak flo = 382 whp
This and these formulae work for the rest of the world so i cant see a problem with them in the Uk !
good luck with your project what ever it is
about 6 - 7 lbs per hp from those examples then (well at the rear wheel)
Quote from: kev-yorksIn general the calculation for a turboed piston engine is 9.5 to 10.5 lb/min of flow per flywheel horsepower. Has anyone any idea what the figures are for a turboed rotary?
Kevin
why the question , are u making custom inlet manifold for lots of flow??
pp even
Lets just say there\'s a lot of little bits being played about with. Due to the nature of the beast a lot is trial and error so i\'ll be posting up next year when its all sorted as to what\'s been done and what has/hasn\'t worked.
Kevin
the figures i quoted are for 2 rotor
Quote from: kev-yorksLets just say there\'s a lot of little bits being played about with. Due to the nature of the beast a lot is trial and error so i\'ll be posting up next year when its all sorted as to what\'s been done and what has/hasn\'t worked.
Kevin
same goes for me mate, heres what my t45 will be flowing through:yes
i think if you take the figure for a piston motor and divide by 1.3 it gives an approximate figure for a rotary, so 50 lb/min=500fwbhp/1.3=385rotary fwhp
matt
No that is incorrect. it would be 380 ish atw.. rotarys have a differant BSFC to piston engines and differant VE depending on the port and the effictive port duration creating a differant BMEP at X boost.
Great post guys - getting technical! :)
Some time ago,I posted,asking for a cfm flow bench .........was shot down in flames:2Rolleyes ...seems it is all relevant to finding what you are looking for guys.Now please believe me it does work.!!!!!!!!! :cool :D Yes I know........
For Era\'s eyes only
Special secret figures for ERA.
122 and 90 and 4
All in metric.
For that top secret special project we are going to do!!
Regards
Carl
Quote from: CarlFor Era\'s eyes only
Special secret figures for ERA.
122 and 90 and 4
All in metric.
For that top secret special project we are going to do!!
Regards
Carl
Thank you kind squire for relinqhishing that valuable information in my favour....:Thumbsup!
Quote from: sdminusNo that is incorrect. it would be 380 ish atw.. rotarys have a differant BSFC to piston engines and differant VE depending on the port and the effictive port duration creating a differant BMEP at X boost.
well i was close:wave
if you need to get your hands on a flow bench why not google \'build your own flowbench\'. There are somne great...and cheap, designs out there.
Steve
Quote from: CarlFor Era\'s eyes only
Special secret figures for ERA.
122 and 90 and 4
All in metric.
For that top secret special project we are going to do!!
Regards
Carl
LOL :Typing
FAO Gary ( K1HKS )
special numbers for you my friend
9 11 15 31 42 46 and 27
Remember you have got to be in it to win it. I love all this play ground talk makes me feal all grown up LOL LOL LOL
Quote from: sdminusLOL :Typing
FAO Gary ( K1HKS )
special numbers for you my friend
9 11 15 31 42 46 and 27
Remember you have got to be in it to win it. I love all this play ground talk makes me feal all grown up LOL LOL LOL
Thank you kind squire for relinqhishing that valuable information in my favour