Neighbor has a 65 210 w/520. Fairly new to him.

Was visiting with him today and he was telling me he was concerned about a couple of jugs running right up to 400 during climb.

I didn't know what to tell him as I've never flown one.

Do they run this hot typically?

I think he's doing the cruise climb thing. Said his 205 which he just got rid of never had this problem.

Les

1. check the mag timing. this is the first place to start.
2. check the fabric/rubber baffling. if this not tight everywhere on a 210/520, it will show up. This is the cheapest and easiest thing for an owner to do.
3. there are tin baffles between some cylinders. These usually get removed or broken.
4. make sure there isnt an extra baffle used during winter ops. Its usually in front of #5 IIRC.
5. Check/see when the last time the oil cooler was cleaned and if it is the "Congealing" type. A dirty oil cooler will keep everthing hot.

Thats all I can recall from my 210 ownership. That and making sure you are out of the red zone.

All the above plus fuel flow. Fuel flow is a common problem.

What they said, but the 210's with the IO-520's inherently run hot as a rule. I'm not as certain on the NA 210's, or the non pressurized ones, but the P models deal with this issue as standard. Step climbing in warm temps even at 500 fpm climbs was the norm if it was warm. These conditions are somewhat manageable I'm told, but before I could spend too much time with mine, I changed it to a TN550 which doesn't experience those issues. (>1000 fpm climbs with temps <360 even when warm)

garth

What Garth said.

Baffles must in the best condition they can be, then modified!!
I have a P210, and after years of tweaking the baffles, the CHT's are getting really good.

One test is to shine a flashlight from the cowl flap behind the engine. When looking from the front of the engine, search for any light getting through. Modify baffles or seal off any "light-holes" with RTV.

A mod that really worked for me, was sealing off the area around the exhaust pipe with baffle material.

In a long climb (above 15.000) you either have to step-climb or have lot of fuel flow (30-31GPH). With this set-up, your take off fuel will be pretty high too(38-39GPH), so care must be taken that engine isn't flooded during take off roll (be ready with the red handle!)

The exhaust pipe mode is something that came with the 210R models as an external fairing.
Some have tried to make similar mods, but have ended up with this mod shifting in-flight and blocking the nose gear doors from opening properly. This in turn has ended with a nose-gear up landing.
The baffle mod is not STC'ed. So its up to your A&P.
Drop was significant.

A NA 210 should have no problems with CHTs . Period.

Check & re-work the baffles as needed, and I'm betting it's needed.

I'm appalled at the condition of most of the +30 year old plane's baffles that I see.

Owners and shops do not pay enough attention to baffle condition.