Modified 100mm Porsche 964 Nikasils - Progress
- Wally
- Posts: 4562
- Joined: Mon Oct 28, 2002 12:01 am
Modified 100mm Porsche 964 Nikasils - Progress
Hi,
As promised I will try to post some pics that I could save on our dutch website and redirect here.
A few more pics will be posted as my pic hosting skills and the capacity of the host site will allow...
Description of the work done can be found in the thread "Hey Wally", one page or so back on this forum.
These are the redrilled cylinders.
These are an unmodified and not cleaned set of used piston and cylinder and a modified set.
Greetings,
Walter
As promised I will try to post some pics that I could save on our dutch website and redirect here.
A few more pics will be posted as my pic hosting skills and the capacity of the host site will allow...
Description of the work done can be found in the thread "Hey Wally", one page or so back on this forum.
These are the redrilled cylinders.
These are an unmodified and not cleaned set of used piston and cylinder and a modified set.
Greetings,
Walter
T4T: 2,4ltr Type 4 Turbo engine, 10.58 1/4 mi
www.apfelbeck.nl
"Mine isn't turbo'd to make a slow engine fast, but to make a fast engine insane" - Chip Birks
www.apfelbeck.nl
"Mine isn't turbo'd to make a slow engine fast, but to make a fast engine insane" - Chip Birks
- Wally
- Posts: 4562
- Joined: Mon Oct 28, 2002 12:01 am
This is a 914 2,0 ltr head, cut mirror wise for the pistons with a 1,5 mm clearence. Deck height will be set at appr. 1,0 mm.
With that deck heigth I will need spacers of around 7mm. The spacers will be very 'wide' since the area around the studs will also sit on the machined case (cylinder area machined down).
Note that we have not machined the top fin off one bit. Also the ridge on which the cylinder will rest is not turned down, all to maintain maximum strenght and as much cc's in the head as possible.
The head has not been been ported or flowed yet and probably will not also. The area besides the valves will have to be 'unshroud' as it is called I believe. That procedure will also be used to cc the heads for the final CR. Not sure what it will become, but hope somewhere around 1:10,5
I hope its all clear at bit
Greetings,
Walter
T4T: 2,4ltr Type 4 Turbo engine, 10.58 1/4 mi
www.apfelbeck.nl
"Mine isn't turbo'd to make a slow engine fast, but to make a fast engine insane" - Chip Birks
www.apfelbeck.nl
"Mine isn't turbo'd to make a slow engine fast, but to make a fast engine insane" - Chip Birks
- Wally
- Posts: 4562
- Joined: Mon Oct 28, 2002 12:01 am
Thanks Jake,
That does mean s/th to me.
Take care,
Walter
That does mean s/th to me.
Take care,
Walter
T4T: 2,4ltr Type 4 Turbo engine, 10.58 1/4 mi
www.apfelbeck.nl
"Mine isn't turbo'd to make a slow engine fast, but to make a fast engine insane" - Chip Birks
www.apfelbeck.nl
"Mine isn't turbo'd to make a slow engine fast, but to make a fast engine insane" - Chip Birks
- Piledriver
- Moderator
- Posts: 22518
- Joined: Sat Feb 16, 2002 12:01 am
- Wally
- Posts: 4562
- Joined: Mon Oct 28, 2002 12:01 am
That set had about 90.000 km (60K miles?) on them.Bobtail wrote: How many km's do those have on them?Do you know?
Really, there is not a mark on the piston wall to be seen. I mean, all the original porsche machining marks in horizontal direction are unmarked on the piston! One would assume, since the piston travels up and down, that vertical marks would be there, but nothing. Its truly amazing. Also because the piston and cylinder have a much tighter fit than I'am used to.
The barrel, once cleaned, is also super smooth at both TDC and BDC. All honing cross threads are still there. Just because of the quality of these parts, its a feast to work with them.
Also, after seeing these alu, Nikasil cylinders you are spoiled! I assure you.
Walter
T4T: 2,4ltr Type 4 Turbo engine, 10.58 1/4 mi
www.apfelbeck.nl
"Mine isn't turbo'd to make a slow engine fast, but to make a fast engine insane" - Chip Birks
www.apfelbeck.nl
"Mine isn't turbo'd to make a slow engine fast, but to make a fast engine insane" - Chip Birks
- Richie
- Posts: 83
- Joined: Sun Nov 10, 2002 12:01 am
Hello,
Darn Wally, you got me all giddy again ! It looks awesome and more doable than I imagined, think should have measured my set a bit better. My compliments to Roberto as I assume he has done the machining. Offcourse you get my compliments as well.
Now, mine's a turboset, soooo.......
Cheers,
Richard
Darn Wally, you got me all giddy again ! It looks awesome and more doable than I imagined, think should have measured my set a bit better. My compliments to Roberto as I assume he has done the machining. Offcourse you get my compliments as well.
Now, mine's a turboset, soooo.......
Cheers,
Richard
-
- Posts: 146
- Joined: Thu Dec 12, 2002 12:01 am
- Wally
- Posts: 4562
- Joined: Mon Oct 28, 2002 12:01 am
Haha, no thats not a hole ! Please!
The original piston has a slight dent in the middle, but because I haven't cleaned or polished anything in the pics, that dent is still black from carbon residue, so are the two dimples left and rigth.
Those two are original valve pockets for the porsche inlet and exhaust valve.
I may have to machine valve pockets for the type 4 valves later on. I have not measured that yet.
Take care,
Walter
The original piston has a slight dent in the middle, but because I haven't cleaned or polished anything in the pics, that dent is still black from carbon residue, so are the two dimples left and rigth.
Those two are original valve pockets for the porsche inlet and exhaust valve.
I may have to machine valve pockets for the type 4 valves later on. I have not measured that yet.
Take care,
Walter
T4T: 2,4ltr Type 4 Turbo engine, 10.58 1/4 mi
www.apfelbeck.nl
"Mine isn't turbo'd to make a slow engine fast, but to make a fast engine insane" - Chip Birks
www.apfelbeck.nl
"Mine isn't turbo'd to make a slow engine fast, but to make a fast engine insane" - Chip Birks