Racerstev

Just wondering if this is a option to replace my broken 16 valve head. There is
a video on U Tube showing a 8 valve to 16 valve swap, wondering if I can go the other way.

Just what is involved on swapping to a 8 valve engine?

Steve

KuHL 951

Not positive but I think the 89 2.7L 8V NA is your only 8V head option if you have an S2 or 968. Unfortunately that head is scarce as unicorn poop because the 3.0L turbo guys grab them quickly.

catamax944

On a 2.5 16v you can put a 2.5 8v head and on a 3.0 16v you can put a 2.7 head . This is because of the difference of the water passage .http://forums.pelicanparts.com/porsc...ead-2-7-a.html
In any case you also have to change the pistons obviously.

Arominus

The wiring is also a bit different so you will need to change the harness in the engine compartment and switch to an 8v DME.

Its not worth the hassle and huge loss of power, get yourself another 16v head. I know its not cheap, but its the only reasonable answer.

blown 944

Why not fix the 16v. If you have the pieces I know someone who can do it

Racerstev

Getting a replacment head is the best option as long as the math still
works out. $1500 for a head is a bit much on a car that's not worth
any more then $3000... You gotta draw the line somewere.

Getting mine repaired might be an option like Blown944 says..

Steve

Arominus

$1500 for a drop in part or what? 500 for the 8v head, 75 to 100 for the DME, how ever much for the wiring harness, don't forget the coolant/heater hoses are different as well, so is the airbox, you need an 8v intake, MAF an possibly throttle body too, The ISV setup is in a different spot so you would need the hoses for that. The 8V cars also don't have the extra TB roller and a different timing belt. Switching is involved and not just bolting up the head. I'm sure i missed a few other differences too.

How much is your time worth? If your head is repairable do it! but if it isn't get the right replacement part. Don't get trapped in the "its only worth $xxxx" thought.

xsboost90

you would need different pistons also- easier to put a running 8v motor in and bypass a couple wires.

Racerstev

I'm thinking a running parts car might be something to look into. I passed on a
84 a few months back for a grand, it ran but the body was in such bad shape..
city car...

Would I want to shoot for any particular year?

Arominus--- I hear you, and for sure I want to keep this car a 16valve. But
I need to keep the math in mind, I don't have any emotional attachment to
this car yet. Heck I've never even driven it. So to spend more then it's worth
for me is just not going to happen. I did enjoy all my other Porsche's over the
years and I expect this one to thrill me as well, but so far it's just been a PITA!

Steve
(EX 928 and 2X 914 owner)

Fara

https://rennlist.com/forums/for-sale...nder-head.html is probably worth considering, depending on how much work you're willing to do yourself.
Could save you a fair bit.

Racerstev

For some reason my account won't allow me to access that link...

Steve

KuHL 951

It's because you need to be a member to look at member classified ads. It's for a complete S2 head with the usual tensioner pad damage...$500. It would help if you posted what year your 16V is also.

xsboost90

he has an S motor- 2.5 16v. Either spring for an s2 swap or drop a common 2.5 8v in there. Go for a late motor 87/88 since they have updates the early ones dont and the 89 is a 2.7 one year motor hard to find parts like your 16v motor.

Arominus

I understand your point, I have a S and i am attached. Its cool seeing all of the little differences between it and the 8v cars. I like it a lot more now that i understand it. Its the little things, did you know you have a magnesium intake? All S's had them, along with the valve cover and cam sprocket cover.

If you stick with your 8v quest, you'll want an 86, 87 or 88 parts car. If its an early dash car the wiring harness will be different as the DME mounted right under the steering column instead of the passenger side footwell. The fuel lines also come up the other side of the car vs an early. An S2 Swap would be awesome and easier, but will run $2500+ for a motor.

Also add the exhaust to your list, i forgot about it. The front section is different, I know the S had a different muffler but i don't know if the 16v cat will bolt up to the 8v front section. You may also want to swap the transaxle to the normal NA one as the S had taller gearing which will make you accelerate slower than a normal 944 8v. You'll want the cluster too as the NA tach has a much lower redline vs an S (6200vs6800).

Ultimately its your car, but damn your looking a *LOT* of work to save $500 vs a 16v head, while losing the uniqueness of your car. Call me crazy but its not worth it. An s2 or 968 motor would be. I'm only being so vocal because you really do lose so much. 30hp may not sound like much, but it really makes a difference. I've had both motors, and the 924S was fun, but the 944S dominates it in every way. Its worth keeping that way, you can't get that power back from the 8v motor either. Not for $500.

Ill shut up now.

Chris

xsboost90

rev limit is in the computer. You should be able to find a ragged out n/a for a grand and use everything you need, sell off your 16v stuff and have cash left over.