Bottom side tins Options

[930cabman]

Does anyone have a pic or p/n of the engine tin(s) that are fit to the underside of a 2.0 with Dansk SS heat exchangers? I have a couple pieces of such tin in my parts assortment, but nothing seems to fit.

I have been running without these for the past couple years and after cleaning up some misc repairs noticed they are missing. Could be why I see 220 F when cruising in the summer months?

thanks

[Superhawk996]

Could be why I see 220 F when cruising in the summer months?

thanks

220F is not hot for an air cooled engine.

[930cabman]

Could be why I see 220 F when cruising in the summer months?

thanks

220F is not hot for an air cooled engine.

Agreed, but when ambient is close to 85 - 90F I need to keep the engine speed below 3300 rpms. I added an old school capillary tube gage to supplement the factory setup.

I have run it to 230F, but thats my high limit

[Superhawk996]

Could be why I see 220 F when cruising in the summer months?

thanks

220F is not hot for an air cooled engine.

Agreed, but when ambient is close to 85 - 90F I need to keep the engine speed below 3300 rpms. I added an old school capillary tube gage to supplement the factory setup.

I have run it to 230F, but thats my high limit

You are making up arbitrary temperature limits that don’t align with the engineering of air cooled engines.

Not intended as a personal insult towards you. Your car do as you see fit.

However, I’ve seen this behavior over the last 40 years of Americans trying to make an air cooled engine work like a water pumper. Physics dictates the way air cooling works, not our American beliefs about “acceptable” oil temps.

Bottom line: not trying to insult you, trying to make you feel better that 230F oil on a hot summer day is no big deal for an air cooled engine.

[930cabman]

Could be why I see 220 F when cruising in the summer months?

thanks

220F is not hot for an air cooled engine.

Agreed, but when ambient is close to 85 - 90F I need to keep the engine speed below 3300 rpms. I added an old school capillary tube gage to supplement the factory setup.

I have run it to 230F, but thats my high limit

You are making up arbitrary temperature limits that don’t align with the engineering of air cooled engines.

Not intended as a personal insult towards you. Your car do as you see fit.

However, I’ve seen this behavior over the last 40 years of Americans trying to make an air cooled engine work like a water pumper. Physics dictates the way air cooling works, not our American beliefs about “acceptable” oil temps.

Bottom line: not trying to insult you, trying to make you feel better that 230F oil on a hot summer day is no big deal for an air cooled engine.

No insult by the least, personally I am a garage hack that gets lucky from time to time and professional information is always welcomed. Thank you for your insight

I have always thought/understood 250F is the high limit for dino oil. Castrol 20W 50 has been my choice for years in air cooled engines

230 is close to 250

[Superhawk996]

230 is close to 250

In engineering terms, 230 is not 250. (IMG:style_emoticons/default/happy11.gif)

@930cabman thanks for being a good sport and accepting my engineer quirks of unintentional insults or being overly blunt here and there.

Even 250F isn’t a problem. If in doubt of this let’s review that the 914 and 911 temp gauge calibrations from Porsche don’t get into the red until 300F. Granted you don’t want to run 300F continuous but 300F is not going to completely destroy Dino oil. Synthetic oil laughs at 300F.


Per gauge calibrations it should be obvious the engine is normally expected to operate in the 180F - 250F temp range.

Seriously I know I’m going to get lots of pushback on this from others but let’s base this discussion on facts.

Here is an engineering text dedicated to the engineering and design of air cooled engines. It was written in 1961. Long before improvements in oil and long before synthetics were widely available.


So what does 1961 engineering say:


Notice that it states that short excursions up to 248F (120C) are acceptable. 230F (110C) is anticipated. Again, to reiterate, this is based in 1960’s oil technology.

The other thing is if you are getting “hot” don’t try to keep engine speed down. The engine is air cooled by a crank driven fan. Downshift to lower gear and bring engine and fan speed up. Increase cooling while simultaneously decreasing load on the engine via the lower gear.

Even in 4th gear you can maintain highway speeds above the posted speed limit in most states.

The biggest issue with 914’s is people trying to drive and maintain them in the same way as a V8 water pumper. Back when I was young and had my 1st 914 I would let friends drive it. They would invariably try to lug the engine in too high of a gear which isn’t good for cooling or performance. I’ve seen the same behavior repeatedly for decades from so called automotive journalists too.