flash968

porsche announced the resonant induction manifold as a new improvement on page 18 in the '92 sales literature for the 968

RajDatta

I will confirm but from what I remember, the 944 S2 manifolds are exactly the same.
Raj

flash968

no idea - haven't pulled one off to look, but one would think they would mention that if they did

they did a lot of work on the induction and exhaust on this car - on that same page, it also talks about "streamlining the engine's internal aerodynamics from the air intake in the nose, all the way back to the tailpipe" - it also mentions the twin tailpipes, new cat, and new muffler

on the subject of the manifold, there is a nice little picture, and the caption "Resonant Induction is one of 968 engine's many "torque enhancement" technologies

early on the page, they make mention of starting with the engine from the S2, but then go about describing the differences

later they also mention the piston spraying, reduced mass rods and crankshaft

RajDatta

http://cgi.ebay.com/ebaymotors/1990-...78333776QQrdZ1

Besides the obvious cosmetic differences, looks like a dual resonance intake manifold to me.
Raj

flash968

hey - i'm just quoting porsche - i said i have not done a side by side comparison - i am told the intake gaskets are different, that the S2 intake ports are smaller too, and that the main difference in the manifold is seen from underneath where you can see the large bulbous casting of the 968 manifold

the part numbers for the S2 are 944.110.035.00 and 01 - the part number for the 968 is 944.110.035.03

peter morgan goes on to further describe the manifold and its new design in his book, and even describes the 0.3 bar (4 psi) boost that it provides

there are those who remember you saying at the celebration in newtown that the 968 intake manifold had a butterfly valve in it - did we all hear you wrong?

also, i just went down and looked at my manifold and to me it looks very different than the one in that pic

RajDatta

Are you speaking for yourself? Because I don't remember us having any conversation. The persons I had conversations with should post this, not people that recieved 2nd hand information. I remember very clearly walking away from you .
OK... please explain how the runners go from long to short or short to long?? How does the system switch from one to the other?? Maybe a butterfly/valve controlled by vacuum???
Go, check a manifold out and you will get your answer.
Raj

flash968

it is first hand - i was in earshot, as were others, who have better manners than myself, and at this time prefer to remain quiet - they may well change their minds soon though

i have seen the inside of the manifold - i have held it in my hands and looked specifically for that which you descirbed, the next day after hearing you say that - there is no valve in there that i can see - there is a manifold on the floor at pete's shop and it has nothing in it - where is it? what vacuum line runs it?

it isn't on this diagram either

https://rennlist.com/forums/images/attach/jpg.gif

RajDatta

Look at a manifold and then talk.
PET illustration 107-15.
Raj

flash968

read the above post

John Etnier

Thanks guys: Let's not hijack poor sendarius' thread or he'll think we have no manners.

flash968

i thnk this should close this issue:

here are pics of the manifold clearly showing a wire running in and out, with no stop along the way to a valve

https://rennlist.com/forums/images/attach/jpg.gif

https://rennlist.com/forums/images/attach/jpg.gif

what am i missing?

RajDatta

You still don't understand the concept of dual resonance, do you?
Your pictures prove nothing, just show one path.
Just some examples:
http://www.pistonheads.com/gassing/t...97792&f=66&h=0
http://www.unixnerd.demon.co.uk/abbrevs.html
http://en.wikipedia.org/wiki/Variabl...ntake_Manifold
Google and find the rest for yourself.

Raj

Todd951968

IMO, the 968 is "better" than the S2 for a list of objective and some subjective reasons mentioned above. But, given that you already have an S2 (and you know the strengths and weaknesses of your particular car) , you may want to ask yourself "how much better does the 968 need to be to warrant selling your car and buying the 968 with its known list of problems/maintenance".

Do the updated looks, 6sp, slight power increase, etc. warrant the several thousand dollar cost of sorting the 968 out. Well, maybe, if the 968 can be bought at the right price.

I bought my 968, first, and love it. But, I wanted more power after a few years. So, I bought a 951 and now have both. Both have about 68k miles but the 951 is much tighter and seems to be built better. They have different characteristics in handling and different interior colors. But, to me. the biggest difference is in power. The mildly modded 951 is MUCH faster. If they were closer in power, as the S2 and 968 are, the difference between the two would not be enough to change from one to the other, to me. In fact, I often ask myself (even given the power difference) if its worth keeping both or should I sell one and get a car that offers a different experience, like a 911.

Bottom liine: I think sitting in the drivers seat of the S2 will not be THAT much different from sitting in the drivers seat of the 968.

H2

Hopefully, residual, collector value of the 968 will count for something. they certainly didn't make many of them...nor the front engined 928s, during the 968 years. Just take a look at the 928 GTS values as compared to older 928s.

Harvey

flash968

raj - i understand it just fine - where is the valve you say is there?

todd - yup

hughett - i too hope for that, but like most other simi-rare cars, the prime examples will probably increase slowly in value, while the higher mileage and worn cars drop, until they are really rare altogether, and then they might climb quite a bit - this could take 20 years though, and during that time you'd pretty much have to mothball the car just to see a few thousand dollars - cars are not normally really a great investment - i'm not sure it really factors in at this point, as prices are still dropping across the board