AI Nut
Still working on using that Ford 1.9L engine in a Mustang II.
An auto piston engine like that is a super light duty engine
(maybe 30 HP continuous). You are asking it to put out at least
150 HP all of the time. I thought it was a 4.1 liter V6.
You got a screaming hand grenade there :-)>
Good luck.
Paul Lamar
Yikes. Paul is absolutely right, but perhaps too generous. 1.9L is
115.9 cubic inches. Even if it were as robust as an aircraft engine,
it would likely produce 55 hp. As to life, keep it under 25 hp and
you could expect it to live. Try to get 100 hp and you'll get a
very short life, esp on exh valves and pistons. If your PSRU
doesn't have a pair of external bearings on the crankshaft gear or
pulley, the crank will break due to side load from the belt/chain/
gears.
Good luck, what is the stall speed of the M II?
Bill Freeman
Long EZ builder & pilot
BSME, MSME
EAA Technical Counselor
Stall speed on this particular animal is about 70 mph according to the
previous owner. ASI indicates mph and not knots, knotty, huh?
The engine type, 1.9L HO EFI has 143 hp according to Ford. However,
several of them have been dynoed indicating about 110 hp at the
flywheel. Thanks, Ford. Several people have added turbos to this
engine and performed long circle and oval track races and the engine
holds up just fine at high continuous hp output. If it weren't for that
empirical evidence, I wouldn't trust it either. A few have pushed turbo
assisted hp up to 330 but they only talk about 1/4 mile runs; engine
still works fine, lasts long time (with forged pistons and rods.)
Limits on the airframe are 180 hp continuous with 210 hp peak max. I
expect that during cruise, it will only be generating about 80-120 hp
like the Lyc's. That should give me 160-170 mph cruise like the
previous owner had with an O-320. Wheel pants and a few other
inexpensive mods should raise that by about 50-60 mph with no increase
in hp output, according to Kent Paser's book and empirical evidence from
other MII owners who have done it.
The PSRU is a Dave Blanton model, with external bearings (large ones)
IIRC.
Thanks for the help!
AI Nut
Those kinds of races are typically less than two hours and the engine
is junk at the end of the race if they are competitive. Mazda rotary
engines will run for years in the same kind of races.
Most people cruise their 150 HP O-320
Lyc at 70% power or 105 HP, that is about 22 inches of manifold pressure
or there about. You will have to run about 10 psi boost all of the time
to get the same power with one third the displacement. That is
about 20 inches of Hg above atmospheric. That means you will have to
run that tiny engine at roughly 5500 RPM and 45 inches Hg manifold
pressure all the time during cruise to get the same performance. The
stress on all the parts is corresponding much higher so the life due
to fatigue of the reciprocating parts will be short. I predict the
exhaust valves will be the first to give up. The most likely time
for it to fail is during full power takeoff which will put you in
dire straits.
Why the 1.9L Ford four cylinder engine? What is your reasoning? What
does it weigh with the turbo?
Keep us informed of your progress as it is always nice to have someone
confirm conventional wisdom from time to time.
Good Luck
Paul Lamar
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