Modified 100mm Porsche 964 Nikasils - Progress

roberto · Post by **roberto** » Wed Feb 25, 2004 1:11 pm

i have a short note.

If you are thinking to modify a set 100mm
make shore you use pistons also from a 964 whit the number 100p36
inside.
there are also 993 pistons look exactly the same only they are lighter and the roof is not thick enough.

The roof gets to thin iff you cut the dome off

greetings Roberto

Wally · Post by **Wally** » Sat Jun 26, 2004 1:54 pm

Just an update with some pics in the pre-assembly stage:

Here you can also see my adjustable puschrod, made from an old stock hydro pushrod:

Here I'am busy checking half lift with my micrometer.

Sorry for the size of the pics.
Greetings,
Walter

Bobtail · Post by **Bobtail** » Sat Jun 26, 2004 5:41 pm

If you're doing that why don't you use the heads aswell It would be so easy..........Or are you?

Wally · Post by **Wally** » Sun Jun 27, 2004 1:51 am

No, I think you and I have a different take on what is 'easy'

I am using rebuild, but otherwise very stock 914 2,0 heads. Only the chambers will be opened up to the required volume.
CR will be 1:10,8

Best regards,
Walter

type3 · Post by **type3** » Sun Jun 27, 2004 4:55 am

That looks amazing!

cheers,
type3

Richie · Post by **Richie** » Sun Jun 27, 2004 8:00 am

Wally wrote:CR will be 1:10,8
Walter

Hello,

That's very nice! What did the math

tell you?
Compliments and respect!

Cheers,
Richard

Wally · Post by **Wally** » Sun Jun 27, 2004 1:34 pm

Hi Richard,
Thanks

, but I'am only halfway there.

The math/method to calculate the dynamic CR is not as simple as it appeared to be: The crank turning is not linear with the piston moving, so actually I'am stuck there I'am afraid.
Since the cam has moderate lift, but long duration, I will have to take my chances. I'am not sure I would be able to squeeze more cc's out of my chambers anyway without losing the proper shape and I'am not going to increase deck height ever...They are now 64cc's.

Greetings,
Walter

Ephry73 · Post by **Ephry73** » Tue Oct 05, 2004 10:39 am

I do have a couple of questions,

How different in length are the 911 cylinders from the type 4 ones?

Is it possible to just use JE pistons with the cylinders?

How much spacing is required?

Special rods needed?

That looks amazing!

Ephry

Post by **Piledriver** » Tue Oct 05, 2004 10:47 am

Looks excellent, may have to keep an eye out for a set of those...

Was someone doing a T5 with these, or was it just mentioned on the T5 forum?

Would the Porsche jugs and heads work on the Wasser stud spacing?
(visions of an "easy" 102x82 911 headed beast floating in my head...)

Ephry73 · Post by **Ephry73** » Tue Oct 05, 2004 10:57 am

That looks like a type 4 case to me.

E

Wally · Post by **Wally** » Tue Oct 05, 2004 1:11 pm

Ephry73 wrote:I do have a couple of questions,

How different in length are the 911 cylinders from the type 4 ones?

Is it possible to just use JE pistons with the cylinders?

How much spacing is required?

Special rods needed?

That looks amazing!

Ephry

Thanks, I now have the short block and one head side completely assembled. Pics will follow in a week or two.

The total lining of the jugs is almost the same as a type 4 cylinder, but the mating surface on the block to the top of the cylinder is much less than a type 4 cylinder.
I have used stock, but lightenend 2 liter rods and a DPR 76,4mm crank. Because of the larger stroke than the stock 71mm I had originally in mind, I have used a comlete plate of 10 mm as a spacing for the cylinders.
A much larger stroke than 76,4 I would not recommend, as mentioned earlier due to cylinder lining length.

Greetings,
Walter

PS I did mention using a set of those on a WBX on the T5 forum, also because the stud spacing of a wasser is much closer to the 90mm square [edit] stud [end edit] spacing of these 100mm bore Porsche 964 jugs. And because the 2,1 ltr wasser already has the 76,4mm crank as stock!!

new1 · Post by **new1** » Wed Oct 06, 2004 2:10 pm

i was collecting parts for a t5 with 90mm porsche barrels but havent been able to find a cheap case in my area yet

Steve Arndt · Post by **Steve Arndt** » Sun Jan 16, 2005 9:33 am

Awesome. I have wanted to do this forever, but don't have the machining skills yet. I'm selling my set complete here:
http://cgi.ebay.com/ebaymotors/ws/eBayI ... AMESE%3AIT

edit: lowered the price 50 bucks.

sraey8 · Post by **sraey8** » Mon Jan 17, 2005 8:08 am

according to roberto, these would get the job done:

http://cgi.ebay.com/ebaymotors/ws/eBayI ... gory=33623

....and only $195.00 as of now!!

Muffler Mike · Post by **Muffler Mike** » Mon Jan 17, 2005 9:08 am

Way Cool.
nice work. i know it has to be a lot of work to do stuff like that. My hats off to you.

sorry its in theory a type 1, but we are all gear heads here. (im pretty sure there is a legitimate type 1 distributor drive in there)
the one of two motors that EMS is building using the 102's. this has the 83mm crank.