Sealing engine tin...how important is it?
 

I just pulled my 1979 930 motor, and I noticed a few elliptical holes in the engine tin that were not being used, on the drivers' side.

http://forums.pelicanparts.com/uploa...1587321708.JPG

I would guess that these were used for the original smog/emissions stuff that is long gone.

Anyways, I was planning on stripping and repainting my tin anyways...should I seal these unused holes up on the engine tin to ensure controlled airflow?

I'm already planning on replacing the engine compartment / tin seals as well as the orings for anything passing thru the tin.

Yeah, and that rear piece has the hole for the air pump, which I guess you are not using.

Back in the day those pieces were readily available at the dealer. I would try to find the correct, no holes, versions. I see some used ones on ebay and I bet it comes up here on the Parts for sale forum from time to time. Pelican may have them new in the parts catalog, but I can't locate it with their "wonderful" search tool.

You could always weld and patch, but for the money, you may as well do it right IMO.

Pressure hose for the wastegate passes through one of the holes
Bruce

Hi Bruce,

If I recall, both hoses for the wastegate ran thru the round holes, and both had round orings. The two elliptical holes were not being used.

Engine isn't original to the car so I wouldn't be surprised if this is incorrect.

Crap. Sorry, didn't notice 930.....

Gordon, I still have the airpump wheel on the scavenge housing, do I still need to source different pieces?

I'm not sure. 930s are above my pay rating.:D

Now that I think about it, that rear piece on my SC did not have a cutout like yours. It just had a bump out on the bottom to clear the pump.

It is not that hard to change that rear piece later, at least it isn't on my NA car .

I don't think it's super critical to seal it up completely but why not do it as good as possible if they are out.

I think there are 2 ways to do it. Patching it up really nice and invisible or cutting out a block off plate and tacking it in there so its clearly visible and reversible. I've done the latter.

I have some thin metal to block those extra holes off with that should be pretty easy to make invisible.