Vilhuer

- Squirter block with extra support rings added to cylinder towers
- Crank drilled like Chevy
- Custom 150mm rods
- Thick top S4 pistons modified to give below 8.5:1 CR and drilled oil drainage holes
- Custom head studs
- Suitable head gasket, preferably not Cometic but something similar.
- '91-95 style heads
- Ever so slightly larger bore GT/GTS intake
- Crank scraper

That is only correct formula for seriously boosted Alusil engine cheaper side side of using GTS or stroker crank. To my knowledge no one has done all that in one single engine.

Vilhuer

I know. 05001->0xxxx for automatics and 00501-> or 00001->0xxxx for manual engines. These engine number ranges include all US and ROW car engines nicely into two separate sets. US and ROW cars have their own VIN sets starting from 0060. This means there is very little correlation between VIN and engine number other than that all four number sets start from small and get towards bigger numbers.

Some VIN will have some engine number what ever engine was available at the time on production line. Only meaningful thing factory made sure was that car got correct type of engine based on what gearbox was installed. Difference between automatic and manual engines are tiny and external but it was important at production line.

mark kibort

what are the intake ribs?

i had the folding wing, and the chassis was #68 but auto.

Bill Ball has my old folding wing from the holbert car on his '79 race car conversion.

mk

Vilhuer

On top of intake outside tube which connects two intake chambers next to black plastic cover on top flappy valve there are few reinforcement ribs. These were added little after S4 production started. First few hundred engines used intake version which don't have these.

I think ribs and cast to plastic filler neck change was done months before squirters were deleted. These changes do not have any direct relationship between them. If this is correct assumption there are several hundred or even over thousand engines which have late style external parts yet have squirters. Thats why its important to know engine number range which have them and not just trust to external signs.

In manual engines its clear cut if Porsche papers are to believed. Automatics are still unsolved mystery.

Mike Simard

Here's what they look like, the intake from engine#123 and some later unkown intake,

dprantl

Can anyone confirm using Porsche literature that piston squirters were not installed on '85-'86 US blocks?

Dan
'86 928S 5-spd w/LSD

AO

Well, I don't think Porsche ever listed what their cars didn't come with, so that might be a bit of a tall order.

RyanPerrella

I dont see what the big deal is with "squirter engine"

I see that posted like its worth more money. As Jim said it could potentially lead to more windage issues.

If i was looking for an engine, i would care more about the late model heads then the 1/2 year production blocks which Porsche we can assume thought was unnecessary and stopped bothering with it. Perhaps due to added cost, or perhaps due to something else that hasnt been mentioned.

The general rule for all Porsche is get the latest you can afford. if an 89 and an 87 engine are priced the same, GET THE 89!

JEC_31

That's kinda like asking for Porsche literature that states satellite navigation systems weren't installed on the 356. It hadn't been done yet, so even if the engineers were thinking about it they weren't publishing it.


What you need is photos of dis-assembled 85-86 32v motors. That's proof.

Glenn M

My 87 Auto VIN 0444, engine # H05648
Aluminum oil filler but ribs on the intake.

My torque tube shaft is the thicker version which tapers down to the splines. Could have been changed out, my 88 has the older thinner torque tube with clip groove. I just picked up a used rebuilt torque tube (has 928 Inter 2/05 painted on it) with the thinner shaft and circlip end for $100. PO had blown the engine (huge chunk missing between pistion 2&4) just after installing the tube.

I also picked up an 89 LSD with 2.54 gears (56K miles) to put into the 87 along with the 91 steering rack and pump.

If I could find an LSD 5 speed then maybe!

Glenn

the flyin' scotsman

Here's a thought: from another thread we discussed the possibility that Porsche deliberately 'detuned' the GTS so the the 911's of the day would still boast more HP. Now taking that back a few years where perhaps the factory was still full bore on the 928 being their flagship car the intro of the squirter blocks were perhaps a stage where they were contemplating significant more power from the engine.

After all, whats the engineering behind the squirters; to cool the pistons!

JEC_31

Flyin' Scotsman, this is the most rational theory I have heard yet on the subject. Well, I mean "rational" in the German Engineering sense of the word, which is not always in the same ballpark... or planet... as the ordinary person's "rational".

It fits right in with how for the S4 the engineers were unleashed and allowed to make 10,000 changes, upgrades, tweaks, and add radical new stuff to the aging 928 platform.

We must take into account that this was a hugely expensive undertaking for a very small company (who at the time had pretty much lost the low-end market to the Japanese) that must've been a hard sell to the beancounters. After all look at the 944 platform and how many design flaws the engineers were NEVER given the budget to fix, even into the platform's 968 twighlight. Search the 944 forum for threads on that and you'll never want one.

So the gearheads who planned to take the 32v to even higher levels got the oil squirters in. Then the budget spigot was turned off, and even sucked a few things back that had been given - like the squirters, which don't make or break an automatic road-cruiser that will only see the track through the parking lot fence. And then aside from the near-mythically-rare CS models and the mild-tune-up GT, the 928 S4 gets no racing love.

Oh well.








And then during the first decade of the new millenium, a mighty aftermarket force rose up to meet the aged platform... and 928s began to rule once more!

RyanPerrella

you guys are nuts

10,000 changes in the S4, sorry there isnt much difference between the S4 and the 86.5. Its all evolutionary, no different then the change made from the 911 SC to the 3.2 Carrera. Its all just evolutionary. Nothing radical in the S4 if you ask me.

I dont claim to know why Porsche put in your beloved oil squirters and why the subsuquently removed them. I dont really care either. But where do some of you guys get this stuff? I can assume from the post that they must have put the oil squirters in because they were going to make a special turbo 928 that would have 10,000 hp and do 300mph.

uh, ok

RyanPerrella

maybe i just have oil squirter envy because i have a 90? Well, you should be envious of my 89+ heads and my GT cams, so there !

dprantl

Piston oil squirters were a very common thing that was added to stock turbo engines in the late 80's / early 90's. I know my stock '91 SAAB 9000 Turbo has them, whereas none of the non-turbo models do. I've beaten the **** out of that car with over 190k miles on it now, pushing 25psi through the turbo for the last ~10k miles making ~115hp per liter and the engine still runs great. It's proven that the squirters help cool the pistons especially in forced-induced cars where combustion chamber temperatures can be higher than NA because of higher charge temperatures due to the compression of air (even with an intercooler). Is it that hard to believe that Porsche planned a forced-induced 928 maybe to compete in a race series for a year or so before it was abruptly nixed? There really is no other good reason to add piston squirters to an engine.

Anyway, who cares why. Anyone got pictures of a disassembled US '86 block?

Dan
'86 928S 5-spd w/LSD