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> Porsche Type 4 Case Question
JimVG
post Jan 15 2025, 01:09 PM
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Can someone tell me what the slotted hole indicated within the red circle on the first photo is, why it’s there, and how’s this case differs from most other cases that I have seen the does not have the hole? Cases in the second photo have no similar hole.

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Ishley
post Jan 15 2025, 01:31 PM
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I looked at a photo of my '73 case from when I had the engine apart.... I don't don't have that.
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914Sixer
post Jan 15 2025, 02:20 PM
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Never seen that oval type type hole in case.
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burton73
post Jan 15 2025, 02:36 PM
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And what is that coating on the inside of the case for?

Best Bob B
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Jack Standz
post Jan 15 2025, 02:41 PM
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The inside coating sheds oil. Supposedly it gets the oil to return to the sump faster.

The outside case coating supposedly increases heat shedding so the motor runs cooler. It's used on the outside of heads too. And, it looks cool (IMG:style_emoticons/default/smile.gif) .
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burton73
post Jan 15 2025, 04:38 PM
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QUOTE(Jack Standz @ Jan 15 2025, 12:41 PM) *

The inside coating sheds oil. Supposedly it gets the oil to return to the sump faster.

The outside case coating supposedly increases heat shedding so the motor runs cooler. It's used on the outside of heads too. And, it looks cool (IMG:style_emoticons/default/smile.gif) .


It all looks cool but is it like a competition toilet flush handle looks cool? but doesn't work any better

Best Bob B

(IMG:style_emoticons/default/av-943.gif) (IMG:style_emoticons/default/av-943.gif) (IMG:style_emoticons/default/sunglasses.gif)
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JimVG
post Jan 15 2025, 04:55 PM
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The photo with the coated engine cases is a clip from Jake Raby’s YouTube video “The Tale of Three Cases”. I simply used that clip to show the difference in the specific area in question.

Jake explains why he uses these coatings in the video.

Back to the initial question….can anyone shed some light on what this hole is???
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Montreal914
post Jan 15 2025, 04:59 PM
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Not answering your question but what type case is it, W, GC, GA?
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JimVG
post Jan 15 2025, 06:09 PM
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I believe that this is a Porsche OEM replacement 2.0L case stamped 004 101 101 A & 004 101 102 A.
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Root_Werks
post Jan 16 2025, 01:46 PM
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That is odd, does it just bottom out/end?
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Montreal914
post Jan 16 2025, 02:04 PM
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The OP got an answer on FB. Here is Raby's comment:

"This crankcase is from an engine originally fitted with hydraulic lifters. This is not a 914 case, it is either a VW bus case with the code of GE (or maybe a rare late GD case) or it was sold as a universal case in the 1980s from VW. I can't see pics of the breather chimney, so I can't tell if has an enclosed chimney from a Vanagon (CV case code). The important part of this engine is it must use the proper (short) oil pick up tube which was never 914 equipment. The passageway is how the oil returns from the oil pressure relief bypass. With hydro lifters this bypass oil was to be instantly recirculated to keep the lifters pumped up during the bypass period."
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Root_Werks
post Jan 16 2025, 03:19 PM
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Thanks for posting that, makes sense.
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73-914
post Jan 16 2025, 05:18 PM
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So in fact it's a OEM VW case
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JimVG
post Jan 16 2025, 05:47 PM
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As a continuation of Jake’s response to my question, I gave him the case numbers and this is what he had to say:

“that’s a newly manufactured replacement case known as a universal case. These had no case code stamped on them. This case likely has a major issue in the oil pressure relief system or the cylinder decks. These cases have been a major pain in the ass for me over the years. Some of them that I found that were NOS were never used and were “new” because they were junk. This one actually appears unused and there’s likely a big reason for that.”

Very grateful that Jake would take the time to help me out! Great guy, and the definitive expert on all things Type 4!
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930cabman
post Jan 17 2025, 03:53 PM
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QUOTE(Montreal914 @ Jan 16 2025, 03:04 PM) *

The OP got an answer on FB. Here is Raby's comment:

"This crankcase is from an engine originally fitted with hydraulic lifters. This is not a 914 case, it is either a VW bus case with the code of GE (or maybe a rare late GD case) or it was sold as a universal case in the 1980s from VW. I can't see pics of the breather chimney, so I can't tell if has an enclosed chimney from a Vanagon (CV case code). The important part of this engine is it must use the proper (short) oil pick up tube which was never 914 equipment. The passageway is how the oil returns from the oil pressure relief bypass. With hydro lifters this bypass oil was to be instantly recirculated to keep the lifters pumped up during the bypass period."




Thanks to Jake for chiming in, the last word in all things T4 engines
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randyt914
post Jan 17 2025, 06:51 PM
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use that case you haev as lamp base. The best is ....#1= w case then
#2=ea/eb/ec
#3=ga/gb/gc only if the "numbers matching" is important. Those are the choices you should make. Toss those other ones in to the "no thanks" pile. (IMG:style_emoticons/default/slap.gif)
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Krieger
post Aug 16 2025, 06:46 PM
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As luck would have it, I have one of these cases with the crank and rods. Does anyone know if the crank and rods are the same as our 914s?
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Front yard mechanic
post Aug 16 2025, 07:15 PM
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The hole is where you pour your money in
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914sgofast2
post Aug 16 2025, 07:25 PM
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QUOTE(Krieger @ Aug 16 2025, 05:46 PM) *

As luck would have it, I have one of these cases with the crank and rods. Does anyone know if the crank and rods are the same as our 914s?


The cranks and rods are freely swappable among the engine cases. A 2 liter crank and rods can be used together in either a 1.7 or 1.8 case in order to increase engine displacement to 2 liters.
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Krieger
post Aug 16 2025, 08:19 PM
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QUOTE(Front yard mechanic @ Aug 16 2025, 06:15 PM) *

The hole is where you pour your money in


(IMG:style_emoticons/default/av-943.gif) maybe a new rabbit hole!
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