View Full Version : La-5FN Engine Problem

07-10-2006, 02:08 PM

07-10-2006, 02:08 PM

07-10-2006, 02:27 PM
Chances are long overheat or using high alt supercharger at 2 low alt. Only ways I've been able to wreck engine of it without combat damage

07-10-2006, 03:31 PM
I haven't run into that...I haven't put much time on the La-5FN so I don't know. I'll run a few tests. How long do you typically spend with the boost on? (i.e. over 100%)

07-10-2006, 05:34 PM
Limitation for forzah was 10 Minutes with rad open and dont use boost in climb.

07-11-2006, 02:38 PM
Huh I flew Lavochkins (mostly LA-5 and LA-7, 5F/FN somewhat rarely) for a long long time and didn't noticed it. I will check this... sounds really bad.

TgD Thunderbolt56
07-12-2006, 06:36 AM
You're doing something wrong wayn. IF the settings you've listed are what you're using, you definitely do have a problem. The La5fn shouldn't damage the engine under any circumstances without using your boost, adjusting mix, or supercharger settings as long as you don't leave it in overheat or climb much above 3500m.

If run very long in overheat, then it will start to go sour. Once it does, you can't fix it...even if your temperature comes back into the normal range.


07-12-2006, 07:56 AM
The FN is notorious for its overheating.

Best to keep the radiator open and no higher than 80% power until you engage. Even then, once you overheat it'll take forever to cool off again.

Supercharger at 3500 meters and 80% mix or you'll be real easy to find with that nice trail of brown smoke.

If you follow these simple steps you'll have no problem making it back to base.

07-13-2006, 06:15 AM
Ok folks...I tested the La-5F and La-5FN in several combat situations doing what I normally do with the throttle on all prop driven fighters and I had no engine failures at all. Just to be sure I started practicing tail slides...throttle on and off...rapid changes in throttle from 0 to 110%...no big deal. It does heat up although I never had to open the radiator...like the FW190 throttling back is sufficient to cool it off. But it stays pretty warm and you're always backing off on the engine when the overheat comes on.

Are you running without cooling down? If so...that will kill the engine. So does battle damage...oil cooler seems to get hit far more often these days.