Rob Edwards

So there are a few options for mounting an oil temp sender:

1. Tap oil pan sump directly
2. Modify a drain plug to accept a sensor
3. Buy one of Carl's oil filter sandwich plate (http://www.928motorsports.com/parts/sandwichplate.php)

All of these are fine, but I don't want to modify the pan itself, and I'm not sure about using a 928 filter with the sandwich plate 'cause it's not clear whether the belly pan will still fit.

So: what about option #4? Tapping the cover plate over the hole in the top of the front shelf on the oil pan, as indicated below? The oil level should be above this, unless you're driving around in big counterclockwise circles......


Thoughts?

Jim bailey - 928 International

number 4 is a nice clean easy option...you might consider welding a fitting to the plate it is a bit thin for tapping threads or make a thicker plate ?

cdbtx

I liked Mark Kibort's solution.... Temp Sensor is located on the dipstick...

drnick

i tried this - if that is the place where the oil level sender normaly sits. the problem i encountered was insufficient clearance above the sender unit. in my case i had a capiliary line coming out and this then contacted the crank harmonic damper.

hacker-pschorr

Murphy's supercharger kit comes with a filter sandwich plate with only one side used to feed the supercharger. I'm going to use the other side for a temp & pressure sender (if they both fit).

I would think the belly pan still fits with this setup.

Doug Hillary

Hi,
Rob Edwards - As you want the tempertaure of the oil in the pan I would purchase a sump plug sender
It will most likely be always covered!

Sorry I cannot steer you towards a supplier but many years ago I fitted these to many VW's, Alfas and FIATs and they work very well indeed. Bosch was one manufacturer

Measuring oil temps from other locations will only provide a dataline - sump oil temperature allows for all variables. As an example oil from turbcharger drain pipes can be >160C or so - oil from one drain line on my CLK Kompressor regularly shows 145C. The CLK's sump temperatue is around 95C

Regards
Doug

hacker-pschorr

Doug - I was thinking about the filter sandwich plate since then you can see the temp of the oil going into the engine, after the oil cooler.

drnick

where would you site the temp sensor in a drysumped motor? would you still opt for the 'mini' sump next to the scavenge point?

Prionace Glauca

Rob,

Looks like that oil pan blanking plate should work. Looks beefy.

Rob Edwards

I asked Carl his thoughts by e-mail, his concern is that if I added a windage tray and/or scrapers, the sender would be shielded from oil.

Doug- Very good point about measuring in the pan. My knee jerk reaction to Erik's post was, ok, I'll run the sender from the sandwich plate when I get a Murf kit, but perhaps that's not accurate. It would tell you whether the cooler is maintaining temp.....

Used coverplates (928.107.209.00) are $20, perhaps I'll buy one, have a threaded collar inserted into it for the sender, and see if it'll fit/work.

hacker-pschorr

I know a few track guys (non-928) who measure both. Just after the filter & the pan.

I think Jean-Louis does this with his 928 race car.

Doug Hillary

Hi,

it is common to consider the "bulk" oil's temperature as it this that determines the actual "core" temperature of the engine. Its rise and fall shows the engine's level of "stress"

Regards
Doug

Jim M.

Rob, Better check your pan before you buy that coverplate. the later S4's and GT oil pans don't have the cover plate. The casting for the pan was changed at some time to eliminate the cover. The boss for the cover plate is stil there, but Porsche stopped drilling the holes at some point.

Jim Mayzurk
93 GTS 5-spd

FlyingDog

If you're not using that port of the sandwich for flow, you may not be measuring the correct temp. I think the drain plug or in a cooler line are the best locations.

Rob Edwards

Well, there's good news and bad news. The good news is that we (well, at least me) learned something. The bad news is that GT's with a 1/90 build date don't have the coverplate. There's just a flat spot machined in the pan. D'oh!

I guess the drain plug will be the trick. Those are only $8, so I can ruin a few learning how to tap.