964 Zylinder Head on a 930

[930/66]

964 Zylinder Head on a 930 possible?

Hi

Is it possible 964 heads on a 930-er. to assemble.
Reason: Thread for double ignition already exists.

Thanks for your reply

[proffighter]

Hi Thomas

I am not that familiar with 964's but I do know that the alloy is different due the higher temps the 930 turbo has to handle, but on the other side there are some carrera engine conversions out there.

Also you have to check static compression ratio, guess it's different too.

So depending on moderate boost level, there is no problem to expect. For a 935 clone I would not recommend others than turbo heads.

I am sure the fellows here can give you more precise answer

See you

Roland

[930/66]

Hi Roland

There are some tuners that offer 964 and 993 turbo conversions
It is not described whether the original heads are used

the compression is reduced and as you will suspect worked with low boost pressure

I write a tuner the offers turbo conversions on a 964

see you

[quattrorunner]

Heads and cam towers might be a needed team? Chris?

[proffighter]

Turbo exhaust valves are sodium filled for better heat transfer...

BTW here are some threads about differences etc...

http://forums.pelicanparts.com/911-930-turbo-super-charging-forum/524341-3-3-vs-3-2-cylinder-heads.html

http://forums.pelicanparts.com/911-930-turbo-super-charging-forum/421713-carrera-heads-better.html

http://forums.pelicanparts.com/911-930-turbo-super-charging-forum/393967-3-2-heads-3-litre-turbo.html

[Speedy Squirrel]

For starters, the head bolt pattern is moved out 4mm to accommodate the 100mm bore. This won't match up with the 930 case. You can use the older style cam towers, but you need the valve covers for the dual plugs.

[930/66]

Hi guys

Thanks for your reply and the link
I have received a response from TTP Turbo tuning.

Build 964 and 993 Biturbo

Adjusted cylinder head inlet and outlet increases, larger sodium filled valves, valve seats are replaced by temperature-resistant seats, cooling the piston crown: changes
For the 930 it would convert to 3.5 liters, 100mm bore as the 964

greeting

[proffighter]

So it sound like a nice engine project. You have to know, that pics are a must here, otherwise you will be banned

[TurboKraft]

Hallo Thomas,

Even if you could fit the 964/993 heads onto a 930, we would not. The thick factory ceramic exhaust port linings do not hold up long-term, often cracking or melting.

Better is to properly prepare your 930 heads for the performance level you are wishing to achieve.

[930/66]

Originally Posted by proffighter

So it sound like a nice engine project. You have to know, that pics are a must here, otherwise you will be banned

Hi Roland

That's what I feared
Joking aside

Yes you know that I have currently no modifications after I removed everything.
I'm back at the beginning and am what I want to rebuild everything.

The complete engine from "Saber" could also be a possibility.

A picture of my 930's.

[proffighter]

Thomas

Yes, I remember you've been a little afraid and returned to almost stock...

Saber's engine seems to be a very nice one, but I think his price range is still not realistic when I talked to Mike a couple of weeks ago about it. Make him an offer and wait another couple of months, maybe he will agree then

Chris's advices are always worth to think about.

Mines are not that conservative in general, but nobody has to copy my work if not feeling good

BTW Good decision to spend more time here than in german forums, more open minded and capable here

[930/66]

Originally Posted by TurboKraft

Hallo Thomas,

Even if you could fit the 964/993 heads onto a 930, we would not. The thick factory ceramic exhaust port linings do not hold up long-term, often cracking or melting.

Better is to properly prepare your 930 heads for the performance level you are wishing to achieve.

Hi Chris

Thanks for your answer

best solution is to use the original heads i think

Had you never problems with cracks in the cylinder head after processing the grooves for the Ni-resist ring`s?

A friend of mine has welded the two upper cooling fins on the cylinder head
near the grooves to no more have problems with cranks.

[TurboKraft]

Thomas,

No, we have had no problems with cylinder head cracking from either twin-plug machining and/or nirisist ring machining.

The only time we have seen cracking is from incorrect spring pressures (valves pounding the valve seats), or, when someone tries to fit much too large valve seats into the heads and there is not enough aluminum to support them.

Welding the first 2 cooling fins is usually required on 964 & 993 heads when building for high performance, ex: high power turbo or RSR.

I will PM you a price for preparing your 930 heads, you can compare to what you are being quoted there.

[930/66]

[QUOTE=proffighter;7732635]Thomas

Yes, I remember you've been a little afraid and returned to almost stock...

Saber's engine seems to be a very nice one, but I think his price range is still not realistic when I talked to Mike a couple of weeks ago about it. Make him an offer and wait another couple of months, maybe he will agree then

Chris's advices are always worth to think about.

Mines are not that conservative in general, but nobody has to copy my work if not feeling good



Hi Roland

That`s true i was a little afraid....now i startet from zero.
I had a call with Saber i have to check his price range...

Your work is amazing but not the right way for me, i think that is the good one here in this forum: live and let live.

It is really a good decision to spend more time here.