|
(Old Stories time) In 1981 I bought an RX-7,
drove it for a year, and had it turboed at a speed shop in L.A. No
intercoolers for cars in those days. The way they got around detonation
was with water injection. A cheap windshield washer container and pump,
and a vacuum sensor at the intake. With adjustable boost, it ran
great! Sea level was the most dangerous, had to watch it close there, but
going over Sherwin and Donners summits (6,000 ft. +) I could dial in almost 9-10
lbs, and that sucker screamed. Put probably 50K miles on it before I sold
it, and never had any trouble. So, all, would water injection be a good
backup for hot days? I heard that some of the early turbocharged
engines during WWII used it, so why haven't we tried it?
Greg Ward
Lancair Legacy 20b, STILL in progress
----- Original Message -----
Sent: Friday, August 24, 2012 8:34
PM
Subject: [FlyRotary] Re: Check Temps on
Climbout was e: [FlyRotary]Turboquestion.
See how
much one can learn from one simple sentance. Thanks all for the
update. David R. Cook RV6A Rotary 28hrs.
From: "David Leonard" < wdleonard@gmail.com> To:
"Rotary motors in aircraft" < flyrotary@lancaironline.net> Sent:
Friday, August 24, 2012 8:51:21 PM Subject: [FlyRotary] Re:
Check Temps on Climbout was e: [FlyRotary]Turboquestion. And just to
belabor the point even more, turbos are less than 100% efficient.
Meaning that any extra work that went into trying to compress the air but did
not, ends up as additional heat in the compressed air. And, the turbo
itself is very hot even on the compressor side, which adds even more
calories. All that being said, you CAN run small amounts of boost
without an intercooler, but you have to compensate by running extra rich and
or retarding the timing. Much better in the long run to use an
intercooler. David Leonard Turbo Rotary RV-6 N4VY http://N4VY.RotaryRoster.nethttp://RotaryRoster.net
On Fri, Aug 24, 2012 at 4:42 PM, Dave Staten <david.staten@gmail.com> wrote:
Air at altitude is cooler because of low pressure. When you compress
it, it heats. Intake temps can be over 250 degrees, greatly increasing the
chance of detonation. Intercoolers are VERY necessary if you want to reap
any benefit from the turbo.
Dave.
Sent from my iPhone
Hay Chris, I'm not
turbo savy, but do you realy need an intercooler,,,,,,,at altitude,,,,,,
the air is pretty cold already, the racers on the ground need them because
the air near the ground is hot, not at 6000+++ feet. just a thought
& will be watching, a turbo instead of a muffler I'm thinking may be a
better choice. David R. Cook RV6A Rotary Lansing
MI.
From: "Chris Barber" < cbarber@texasattorney.net> To: "Rotary
motors in aircraft" < flyrotary@lancaironline.net> Sent:
Wednesday, August 22, 2012 9:49:50 PM Subject: [FlyRotary]
Re: Check Temps on Climbout was e: [FlyRotary]Turboquestion.
Yes. That is correct. The 3lb spring limits boost it is the lowest I
have as I wanted to start low.
I checked my intercooler and it is flowing well. No obstruction or
leak I could find. It may be the location of the blow of valve. I will
remove it and see if I get good boost
Sent from my iPhone 4
Andrew, I believe the 3 lb spring he is talking about is the
wastegate spring, this limits boost, the 3 lb one is the lowest boost
available, as the springs get stronger the more exhaust is forced
through the turbo.
Chris?
Chrissi & Randi
www.CozyGirrrl.com
ClickBonds 10/$7.50
CG
Products, Custom Aircraft Hardware
Chairwomen, Sun-N-Fun Engine
Workshop
Chris
if your blow off valve is before the
intercooler, it may just be opening too soon with that 3lb spring and
allowing all your air to vent, then the engine would act as NA but
with the intercooler as a added restriction. try a heavier
spring.
Andrew
On Thu, Aug 23, 2012 at 6:53 AM, Chris Barber
<cbarber@texasattorney.net> wrote:
Thanks Ed. I am pleased you verified my concern
after my cooling skyrocketing yesterday when I went to full
power.
Trying to determine where the restriction is
now.
You are the best.
Sent from my iPhone 4
On Aug 22, 2012, at 4:48 PM, "Ed Anderson" < eanderson@carolina.rr.com> wrote: >
Chris, One thing to be checking on your next take off is your
coolant/oil temps. As you know take-off is the worst
combination of low cooling air mass flow and max engine temperature
due to WOT. > > You would be surprised how quickly (with
the additional power you now have) you will exceed your cooling
limits if not careful. So I would be certain to check the
temps at a frequent rate on your next take-off until you know how
the system is going to react - hate to see you cook your engine
during your first real Turbo climb out. > > I find for
my Rv-6A that I needed to get to 120 mph IAS as quick as possible to
get on the good side of the cooling curve. So that generally
meant take off - get safely above surround obstructions, then level
off/reduce climb until airspeed hit 120. Then I could resume
climb with cooling gradually bring the temps down as altitude and
airflow increased. Your sweet spot airspeed would undoubtedly
be different given different platform and cooling set
up. > > Ed > >
-------------------------------------------------- > From:
"Chris Barber" < cbarber@texasattorney.net> > Sent:
Monday, August 20, 2012 9:17 PM > To: "Rotary motors in
aircraft" < flyrotary@lancaironline.net> > Subject:
[FlyRotary] Turbo question. > >> As I have mentioned
I have had what I think are incongruent readings regarding my
manifold pressure (mp)and engine rpm. It seems I am getting quite
low mp as I add power to higher rpm. >> >> I am
not well versed in this area but my thought is that as I add power,
even with slight boost (currently using a 3 lb spring in my
wastegate) eventually my mp should raise a bit
more. >> >> Today I did some static test. I
recorded engine RPM with the turbo hooked up and recorded the
mp at 1000 rpm increments. Then I removed the turbo plumbing from my
intake and recorded the same info My results currently confuse
me. >> >> With the turbo hooked up I am
getting >> >> RPM. MP inches >>
2000 - 14.0 >> 3000 - 15.5 >> 4000 -
19.3 >> 5000 - 21.6 >> 5700 - 24.5 (topped
out) >> >> With the turbo
removed. >> >> 2000 - 15.8 >> 3000 -
15.3 >> 4000 - 19.7 >> 5000 - 24.8 >>
5833 - 29.8 >> >> Is this indicative of
restriction in my plumbing? Perhaps in the inter cooler? A dirty air
filter? A bad pop off valve or a leak not allowing the air pressure
getting to the intake. Or???? >> >> I am uncertain
what other permitters I need to check and provide. I am just
starting my diagnosis in my Phase One testing. I only have 1.6 hours
in the air so far. I value ya'll's direction and
input. >> >> Heck, perhaps this is working
properly but it just doesn't seem
right/comfortable. >> >> Thanks
folks. >> >> Chris Barber >>
Houston >> Velocity SE >> Rotary 13b turbo (?)
:-) >> >> >> >> Sent from my
iPhone 4 >> -- >> Homepage: http://www.flyrotary.com/>> Archive and
UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html>> >> >>
----- >> No virus found in this message. >>
Checked by AVG - www.avg.com>>
Version: 2012.0.2197 / Virus Database: 2437/5211 - Release Date:
08/20/12 >> > > -- > Homepage: http://www.flyrotary.com/> Archive and
UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html-- Homepage:
http://www.flyrotary.com/Archive and UnSub:
http://mail.lancaironline.net:81/lists/flyrotary/List.html
--
Regards
Andrew Martin
Martin Ag
275
Newmarracarra Rd
Moonyoonooka WA 6532
0427477144
08
99241145
andrew@martinag.com.au
--
|