Tuna Can, Who is the good source Options

[lmcchesney]

I need to add a tuna can to the engine. Who is the best source? Weiltmeister?
L. McC

[fiid]

Don't forget that there is quite a lot of oil down there and you have to be cornering pretty hard to run into this effect anyway.

I have only heard of the problem being a momentary lack of oil pressure. This solution (which is very cheap and easy to install) seems to capable of relieving it for long enough to make a difference on a lot of type IVs. The main problem seems to be physical interference (rocks). I think it would be hasty to dismiss it entirely.

[machina]

We corner pretty hard. (IMG:style_emoticons/default/smilie_flagge24.gif)

Accusump is cheap insurance, and it pre-oils.

dr

[fiid]

You are right though - if you are in a long sweeper and are able to produce enough lateral G to get the oil out of the way of the pickup, and maintain it for a length of time, then this probably is not the right solution.

It should be easy to calculate how much lateral force it would take though and you can easily measure that in your car, so you could make a quantitative assessment about weather it is a tenable solution or not.

[seanery]

how does the deep sump kit compare to the tuna can? Are they different enough that it's apples vs. oranges?

[grantsfo]

The problem is that they changed suppliers at one point.  The new center "bolt" was too long (it actually has internal threads, so I think it's really a nut but it looks like a bolt) so you could never get the can up against the bottom of the crankcase.  You can probably cut off part of the bolt, but...

We bitched at WM and they started sending us the proper parts.  I think, but am not certain, that the kits with the too-long "bolts" have worked their way out of the supply chain.

I don't recall the exact size of the "good" versus the "bad" ones.

Pelican can get them for you, as can just about every other supplier of aftermarket Porsche parts.  Almost everyone carries Weltmeister stuff.

Jake hates the tuna can, but in a rear-engine'd application it seems to be a lot easier to scrape the bottom of the motor against something.  (Which will trash the crankcase if it's got a tuna can on it.)

--DD

I ordered one from Pelican a couple weeks ago and was going to install in a couple weeks. What are chances I have a good one? How can I tell?

[machina]

i think the magic bullet for deep sumps is a type I sump that jake modifies to fit a type IV. Not sure why its better than the ones made for our motors but I'm sure Jake has a damn good reason.

Regarding calculating sustained lateral g's and the oil starvation. I wouldn't know where to start the math. In the real world, probably wouldn't matter anyway. Turn 17 at Sebring is super bumpy, you have heavy braking from a loooong straight followed by a right hand sweeper that must be several hundred yards long.

I'll be watching all the gauges for a while before I feel comfortable there again. With the old 1.7, I just didn't care. Now its a different story.

dr

[URY914]

Here is a shot of me in turn 17 at Sebring. This was a few years ago. As you can see, several "G's" are involved. I'm sure that left side valve cover in full of oil.

Paul

[machina]

Paul,

That is an awsome shot.

And thats when your car was "heavy"

dr

[Dave_Darling]

Attention, attention--I am a dumbass!!

The "bolt" isn't too long, it's the oil pickup tube that is too long, just as Fiid said! Grr, sometimes my memory...

The tuna can works exactly as described, and keeps oil pressure going for "several seconds" longer than stock when you get into a sweeper. Most corners don't last much longer than it takes to empty the tuna can, at least if you've got a somewhat-streetable 914. In my car, I was able to run four on- and off-ramps in a row before the light came on after I put on the can. I was able to run just over one, I believe, before I did that.

The tuna can is not the be-all end-all; it is not a perfect solution. (Nothing is.) A full deep sump should keep the pickup submerged for longer, but usually at the expense of hanging down even lower. An Accusump gives you some period of time (depends on the size of the AS) of oil pressure even when the pump is providing zero pressure. Nice to have, but kinda expensive and kinda overkilll for most of us. A dry-sump system is really very nice, but is waaaaay too expensive for most of us and kind of a pain to fit.

I believe that Pelican started getting the corrected versions of the kit at least three months ago. When in doubt, ask. Might be a good idea to make certain that you can actually tighten the "can" against the pick-up before you start pouring oil into the motor, too...

--DD

[URY914]

I had just passed the 930 going down the stright and tossed the car into the corner... (IMG:style_emoticons/default/cool_shades.gif)

Paul (IMG:style_emoticons/default/smilie_flagge24.gif)

[thesey914]

(IMG:style_emoticons/default/agree.gif) Awesome shot! Yeah look at all that weight screen, roof.....duck tape (IMG:style_emoticons/default/smile.gif)