T4 Engine tin: thermal design Options

[914werke]

So seeing a product recently got me thinking about the result of its application & my own observations of how well (or not) the T4 handles air flow, Engine block cooling & resulting oil temperatures. (IMG:style_emoticons/default/smile.gif)

Its somewhat well known that ...in the 914.. the T4 suffers from less than optimal cooling from the front mounted impeller/fan particularly to the #3 Cylinder
& that it is vitally important to seal the tins multiple openings to contain as much laminar air flow front to back over the finned cylinders.
In a gross approach, the goal was to seal the engine compartment "intake" air on top from the eng. heated "cooling" air below the tins.
When a motor is new and all its components serviced & refreshed, the design does, or did, a pretty good job.
After years of use (neglect), elements (oil dirt mice ext) conspire to restrict that air flow.
As well as eng. heat causing hardening of rubber pieces that are intended to help contain that cooling air below.
Now almost 50 yrs on I see fewer & fewer "STOCK" engine configurations which you can guess usually means more heat to deal with.
Jake addressed the cooling air via his(?) DTM solution, but IMO its not very practical for stock or near stock motors (& expensive)

The go-to response to eliminate that heat is usually an additional or a remote oil cooler which comes with its own set of challenges. (IMG:style_emoticons/default/confused24.gif)
How about KISS (IMG:style_emoticons/default/biggrin.gif) Has anyone used any of the Fiberglass based stick-on reflective heat shielding products on the engine-sides of the tin?
Idea being rather than allow heat absorption to all the those steel pieces reflect it back to carried away by the cooling air?

BTW Im not a Porsche engineer...but I did stay in a Holiday Inn last night (IMG:style_emoticons/default/happy11.gif)

[moto914]

Hi. My around town & ocasional 2 hr highway runs, avoiding traffic jams (getting a snack at an exit) head temps were ok.
The interest here is in the discussion.
"Upgrade the Floor Pan Air Deflectors" Nice point.
" Front ducting to eng. fan" Stated to work.
So how about some sort of scoop routing air through floor pan deflectors, for those who performance drive. Any thoughts?

[r_towle]

Hi. My around town & ocasional 2 hr highway runs, avoiding traffic jams (getting a snack at an exit) head temps were ok.
The interest here is in the discussion.
"Upgrade the Floor Pan Air Deflectors" Nice point.
" Front ducting to eng. fan" Stated to work.
So how about some sort of scoop routing air through floor pan deflectors, for those who performance drive. Any thoughts?

The firewall air deflectors create more “suction” under the car to help the fan blow air down.

[914sgofast2]

Hi. My around town & ocasional 2 hr highway runs, avoiding traffic jams (getting a snack at an exit) head temps were ok.
The interest here is in the discussion.
"Upgrade the Floor Pan Air Deflectors" Nice point.
" Front ducting to eng. fan" Stated to work.
So how about some sort of scoop routing air through floor pan deflectors, for those who performance drive. Any thoughts?

The firewall air deflectors create more “suction” under the car to help the fan blow air down.

Anyone know why the factory used two (2) under the car firewall deflectors instead of one longer piece across the bottom of the car at the bottom of the firewall?

When factories stared putting air deflectors/air dams under the front of cars to force more air into the radiator in front engined, water cooled cars, they used a long continuous piece of rubber/plastic below the bumper/radiator opening.

[wonkipop]

Hi. My around town & ocasional 2 hr highway runs, avoiding traffic jams (getting a snack at an exit) head temps were ok.
The interest here is in the discussion.
"Upgrade the Floor Pan Air Deflectors" Nice point.
" Front ducting to eng. fan" Stated to work.
So how about some sort of scoop routing air through floor pan deflectors, for those who performance drive. Any thoughts?

The firewall air deflectors create more “suction” under the car to help the fan blow air down.

Anyone know why the factory used two (2) under the car firewall deflectors instead of one longer piece across the bottom of the car at the bottom of the firewall?

When factories stared putting air deflectors/air dams under the front of cars to force more air into the radiator in front engined, water cooled cars, they used a long continuous piece of rubber/plastic below the bumper/radiator opening.

the deflectors are more or less lined up with the rear exit openings in the underside tin (if you have the lower air guides) or more generally lined up with the air exit areas either side of crankcase.

radiators in front engine cars are centrally located and wide. hence the dam needs to be across most of the front.

i'm sure the vw/porsche engineers had the optimum solution when it came to those deflectors and real word tested it.