How about cold water injection directly into the intake air stream?
I can't remember much about how it works other than cooling the intake air temp after the turbo / super for the same result, colder = more mass for same volume = more oxygen = MORE POWER!!!
I have a vauge recollection about WW2 aero engines using water injection concurrently with increasing the wastegate pressure. Something about not only did the water cool the intake gas temp, but also converting the water into steam enabled much higher compression ratios. Not sure so happy to be "educated" by KB experts.....
I think you'd be correct on the WW2 planes, with water injection you can run higher boost and not crack or melt pistons
On a related note, I've been pulling down a Z18 in a Datsun 720 that's given itself a nice dose of water injection on cyl.4...
Last edited by ducatilover; 8th March 2012 at 18:49. Reason: Gwammmmmarrr
Also the exhaust gas will only slowly expand after it leaves the engine port before the turbo as there is no additional heat being added (PV=nRT) and it wouldn't flow otherwise. But it will expand quite a lot as it passes through the turbo and / or reduce temp and / or pressure; as energy is transferred to the other side of the turbo.
Will goggle / pootube that as may find some interesting stuff.
720 - Dads got one that sufferring from body cancer but the engine is simply stunning for starting. Does your involve a head gasket issue? He bought his new in 85, the hand brake style 4wd selector was brilliant, never worked out why others didn't copy it.
This blew the gasket on the intake side at the back on number 4.
It's a horrible thing to work on (it's on big rubber and I'm only 5ft7 so I have some reaching issues
There's a small amount of cancer, but it's actually not a bad rig to drive.
The auto locking hubs are rather nice and it rides well for an old ute.
It's not mine though, although I do like it.
Nice read here - old school! Merlins etc
For those that don't know that much about turbo's ...
And water injection ...
Bravery is not being without fear ... but continuing ... in spite if it ..
The Toyota Y series engines are very, very easy to work on, camn knock a headgasket job out on one in just over 2 hours.
I'm pulling the donk out the 720 soon, need to check the bottom end.
Had a guy on the yard one day tell me if you had a turbo timer you didn't need an intercooler. I didn't bother explaining to him the difference, I just simply drew him a little picture of what they each did, and then asked him to explain what he said again.
used to work with a guy that had detonation problems in his turbo rally car so he set up a crude water injection system using a winow washer pump some hose and a button under the accelerator pedal so when he put his foot to the floor it pushed the button and squirted water into the inlet stream via the washer pump.. Worked a treat.
I mentioned vegetables once, but I think I got away with it...........
I always liked the fact that people paid $200 for a glorified APEXI egg timer. Had one guy tell me it calculated the time on his car that the turbo needed to spool down. Asked him very politely where it plugged into the computer on his carb'd mitsi.
Laughed at the ford dealership the other day. Turns out heaps of people (such as myself) had complained about the overpressure+lag of the turbo on the TDCi.........so ford came out with a 'hot fix patch'.
Nope wasn't a computer download or a tune..........there is a tiny blow off valve installed now lol
At first I thought my clutch was doing something funky........too me a while to realise what it was.
So now its half boy racer and half tractor.
Love many, Trust few, Always paddle your own canoe.
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