Fw 190A

[joeblogs]

There definitely is a peak to the torque cirve for A/C engines; you can read it off the engine altitude power charts that put engine RPM and manifold pressure on a grid. I was just saying that the torque curve isn't nearly as steep as what you see on a car engine.

-Blogs

Originally posted by Charge
"Pelican Perch on the web. A lot of this stuff is discussed there."

Yup, a great place. Deakin seems to know his stuff.
Lots of good info about engines. Not to mention those Hurri and Zero articles, too.

I may be wrong because I was talking about non-charged engines. As you said the thermal issues may well be the biggest problem in charged engines and they may in turn induce severe knocking issues which quickly lead into a mechanical failure.

"They are designed to be used across a broader range of RPMs than an engine in a car, which typically has a sweet spot around 3,000-4,000 RPM."

Actually I thought it was another way around. I have always thought that the a/c engine is nearly always used at its most optimal RPM and the head and cam timing/design try to peak max torque and max power at that point, where as the car engine has to provide enough torque first and highest power only on higher RPMs.

I don't know so much of this stuff that I could argue about it. Just some assumpitions I've had for awhile.

-C+

[sharp8th]

[JAWS2003]

Originally posted by Zoom
Most of what I have read has said that the A-3 thru A-8 models all used the BMW-801D-2 engine. If this is the case then what accounts for the performance differences of the different models, especially the jump in top speed from ~390 to 400+ mph from A-3 to A-4? Were different boost levels/systems or superchargers used? I don't think MW-50 was employed until the A-8 model so something else must account for the differences in top speed. I know that after the A-4 the top speed stayed the same or decreased due to weight increases, but the A-3 and A-4 were basically the same plane so shouldn't they have similar top speeds?

What makes you think it was the same engine between all fw-190's?

If they are called 802D-2 it doesn't mean they were all the same. It was a serie of motors just like you have today, let's say, Detroit Diesel D60.
 You can get them at 350 Hp,  500hp, or anything in between.
Check this:






Between FW-190 A, F and G there were six BMW 802D-2 engines. all different. (posted long time ago by Crump)

[gripen]

Hm... That seem to be dated late 1944 when there were several different engines in service (D-2, TU, TS and even some Cs might have been still in service then). The doc just says " BMW 801 Motor". Besides the FW seem to use same power chart for all calculations for BMW 801D-2 powered versions.

gripen