Modified 100mm Porsche 964 Nikasils - Progress

Wesayso · Post by **Wesayso** » Tue Jan 20, 2004 2:37 pm

Wally wrote:I may have to machine valve pockets for the type 4 valves later on. I have not measured that yet.

Take care,
Walter

Thats one thing I'm very curious about, and what lift you could run without getting into to much trouble... time will tell I guess

roo · Post by **roo** » Wed Jan 21, 2004 10:48 am

yeah wally i had my doubts as to whether this was gonna work when i saw that "hole". i was scared to ask it as it was a dumb question but i had to be sure

Muffler Mike · Post by **Muffler Mike** » Wed Jan 21, 2004 11:20 am

those are nice.
been seeing a few of those at the shop i hang out at. (EMS)
there is one going together now that will use those in a 102mm coupled with a 94 crank.

something like 3070ish cc.
(sorry its a t1)

Wally · Post by **Wally** » Wed Jan 21, 2004 12:33 pm

Thanks Mike,

Nice that you also look here at the type4rum

Yeah, I know the 102's also exist; They are from a 3,8 ltr Carrera.

Unfortunately, they are more scarse and thus expensive. For me, it was/is more of a 'low'-budget experiment and its also a test-bed for my EFI set-up that I later want to install over to my future 'bigger hp than Jake's engine beast' haha.

Mike, do you know how they got away with the 94mm stroke on these porsche cylinders? The reason I ask is that both 100mm and 102mm worked with a 76,4 stroke in the Carrera engine.
My 71mm will not be an issue therefor, but more than 76mm might be.

Nice to know that I'am not the only one trying this tho.

Take care,
Walter

Muffler Mike · Post by **Muffler Mike** » Thu Jan 22, 2004 6:38 am

not sure witch way they will tackle this yet.
On Chihiro's Super Street race motor, they actually mounted the cylinders to another aluminum plate that bolted to the case and was bored the same as the cylinders and used that as the bottom extension/transition and may have even used the case as well. (pauter case, just a big chunk of aluminum) Eventually they found a second set of used cylinders and stacked them. so the fins looks a few inches longer. (probably the best way.) and that was on an 83mm crank.

this latest motor is using new cylinders $$$ but the customer has money.

Chihiro's motor actually used a 98mm in a stock type 1 head stud pattern. WOW! its impressive how good those things work.

its going to be a month or so, before they get that far. but i will keep my eyes open and try and keep you informed.

Steve Arndt · Post by **Steve Arndt** » Thu Jan 22, 2004 11:44 am

I have a complete low mile 964 100mm p/c set for sale if anyone wants to do this. I need what I paid, $550. The guy I bought them from went to the 102mm 3.8 setup.
Steve

njv · Post by **njv** » Thu Jan 22, 2004 1:15 pm

hi
what is the wrist pin size on those wally? nice work

Muffler Mike · Post by **Muffler Mike** » Thu Jan 22, 2004 1:35 pm

Steve Arndt wrote:I have a complete low mile 964 100mm p/c set for sale if anyone wants to do this. I need what I paid, $550. The guy I bought them from went to the 102mm 3.8 setup.
Steve

thats a pretty damn good price, considering they really dont ware out. (nickasil is a bitchen thing)
and if you ever looked at the price of a new set

Wally · Post by **Wally** » Thu Jan 22, 2004 1:44 pm

njv wrote:hi
what is the wrist pin size on those wally? nice work

Thanks; wrist pin is 23mm. I had my stock 2 ltr 24mm rods rebushed to 22mm and then honed to 23mm.
Walter

njv · Post by **njv** » Thu Jan 22, 2004 2:20 pm

hi
that sounds about the best way you could go about it wally !

i think im gonna start keeping an eye out

for a set of these whats an average price for a used set? well i say set but i only need 4 not 6!!!

Wally · Post by **Wally** » Thu Jan 22, 2004 10:46 pm

Hi Neil,

No idea on prizes of used sets, but it is handy to have two extra jugs/pistons if you screw one up! Its just what you can get or is available in the area you're in. Your ability to be able do do the mashine work yourself or have somebody you trust to do it for you, is much more important, because a lot of machining is involved.

Mind you that my engine isn't finished yet, let alone that it runs well. The lack of finnage on these cylinders may or may not cool well enough for one; there are maybe ten other issues that could be a problem which I don't know about yet. Only actual driving experience will tell. So, don't get over exited now. I just _thought_ it might work. If you want to be safe only a little bit, one better buys a LN set.

I just wanted to show what I was working on and hopefully get some pointers of some experienced builders as well.

Take care,
Walter

Rescue912 · Post by **Rescue912** » Fri Jan 23, 2004 9:21 am

Keep us posted. I have a grenaded 3.0L (95mm) and a yard sale 3.3L (97mm) that I might be able to scrounge 4 cylinders off of if this works.

I don't think cooling will be an issue even with the reduced fins because those jugs cool really, really well. It might even produce more airflow since there will be less static pressure and cool better, who knows...

Think I am going to head out to the barn with a mic and see what I have got hiding in the rafters

Definitely keep us up to date on your progress, very cool !

kit · Post by **kit** » Mon Feb 23, 2004 4:37 am

Hi Walter
love the pics.your friend has done a good job on the machining.
I see oyu have taken the top of the bore down to clearance the T4 head(approx 4mm?).
this all kooks more doable than my 103's

kit.

Wally · Post by **Wally** » Tue Feb 24, 2004 12:03 am

Hi Kit,
Thanks. We left about 2,5mm remaining on the top of the piston - which is, not coincidently - then the same as the piston top from the turbo 965 pistons (thanks for that idea Roberto!)
BTW, I just took over a DPR 76,4mm crank from Wesayso to go with those pistons. That is the original 964 stroke, so the barrels are used to that

Take care,
Walter

kit · Post by **kit** » Tue Feb 24, 2004 2:03 am

I have a 75mm crank to go with this set
kit