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is anyone running 9.5:1 pistons ?

 
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augidog  



Joined: 03 Mar 2003
Posts: 1360
Location: New Jersey

PostPosted: Sat Dec 16, 2006 11:57 pm    Post subject: is anyone running 9.5:1 pistons ? Reply with quote

I'm just wondering if they are the same as the Euro's with just a better quench.I may install some on my daily driver. I'm just putting out some feelers. I'll be going all stock except the new pistons.
Thanks
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1978 924 95 mile daily driver.
Audi TB/POR174M/High Flow Cat/2.25" exhaust
I knew that positive thinking thing wouldn't work.


Last edited by augidog on Sun Dec 17, 2006 12:06 pm; edited 2 times in total
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Min  



Joined: 04 Nov 2002
Posts: 2368
Location: Vernon, British Columbia, Canada

PostPosted: Sun Dec 17, 2006 3:17 am    Post subject: Reply with quote

all 924na's have pretty bad squish area, becuase the pistons sit so low in the block, and don't have very large dishes in the pistons, Becuase they sit so low (3-5mm) down in the block, technically they don't really have any 'squish'

Min
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Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting.
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Vince Ponz  



Joined: 02 Nov 2002
Posts: 3581
Location: Florida

PostPosted: Mon Dec 18, 2006 8:54 am    Post subject: Reply with quote

I have them in my car.

Vince
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"Never let them see you sweat"
77.5 924 modified track car
79 931 Euro stock
88 924S SE
87 911 Targa stock
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emoore924  



Joined: 13 Apr 2004
Posts: 2801

PostPosted: Tue Dec 19, 2006 3:03 pm    Post subject: Reply with quote

I have 9.5:1 cossies in the basement
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endwrench  



Joined: 07 Dec 2002
Posts: 1631
Location: Victor, Montana

PostPosted: Wed Dec 20, 2006 4:18 am    Post subject: Reply with quote

I run 9.5:1 compression with 8.5:1 pistons. Block is decked .050"

Todd
_________________
'79 924NA. Rebuilt 9.5:1, MSDS header, Mega Squirt Injection, MJLJ-EDIS Ignition, 1.6L Whipple Charger and Intercooler, 10lbs Boost, 944 Trans, Custom HD Clutch.
"simsport" said....superchargers are better than turbos its official!....
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Joes924Racer  



Joined: 03 Nov 2002
Posts: 11964
Location: Oregon, Denver Colorado native!

PostPosted: Wed Dec 20, 2006 6:24 am    Post subject: Reply with quote

block deck..there ya go that ll give you a bump
before my pistons went I had 9.0-1 and I felt
the difference on the freeway from 8.5 anyway
suppose you could go with a nos kit with a blow off valve.
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1979 porsche 924 Na
1980 porsche Turbo 931GT Replica
Have u ever driven a turbo.
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augidog  



Joined: 03 Mar 2003
Posts: 1360
Location: New Jersey

PostPosted: Mon Dec 25, 2006 12:36 am    Post subject: Reply with quote

The set I'm looking at are standard bore FINISHED HONED SIZE, 86.520. for $100 without rings.
What is the likelihood that I won’t need a re-bore? I have two original engines.
_________________
1978 924 95 mile daily driver.
Audi TB/POR174M/High Flow Cat/2.25" exhaust
I knew that positive thinking thing wouldn't work.
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Chrenan  



Joined: 15 Jan 2003
Posts: 3899
Location: Canada

PostPosted: Mon Dec 25, 2006 1:46 am    Post subject: Reply with quote

The 77 block I used for my rebuild was not running when I got it, came out of a car with unknown mileage and unknown maintenance that had clearly been abused based on the condition of the body and running gear. The machine shop I brought the block to said they had never seen a used block with such nice bores, the factory cross hatching was clearly visible. They just did the minimum (hone or re-applied the cross hatching, something like that) and I was good to go. That was the first time I really bought into the theory that the 924 bottom end was "bullet-proof".
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1987 951 - M193 Version for Japan
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Min  



Joined: 04 Nov 2002
Posts: 2368
Location: Vernon, British Columbia, Canada

PostPosted: Mon Dec 25, 2006 5:19 am    Post subject: Reply with quote

Chrenan wrote:
The 77 block I used for my rebuild was not running when I got it, came out of a car with unknown mileage and unknown maintenance that had clearly been abused based on the condition of the body and running gear. The machine shop I brought the block to said they had never seen a used block with such nice bores, the factory cross hatching was clearly visible. They just did the minimum (hone or re-applied the cross hatching, something like that) and I was good to go. That was the first time I really bought into the theory that the 924 bottom end was "bullet-proof".


I've opened 4 924 motors so far, and all of them have the factory crosshatching visible. I've also had machinists mention that the rods are huge.

Min
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Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting.
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endwrench  



Joined: 07 Dec 2002
Posts: 1631
Location: Victor, Montana

PostPosted: Tue Dec 26, 2006 5:59 am    Post subject: Reply with quote

Mine had 130,000 miles and rust in the cylinders and it cleaned up great. I have NO oil usage.

Todd
_________________
'79 924NA. Rebuilt 9.5:1, MSDS header, Mega Squirt Injection, MJLJ-EDIS Ignition, 1.6L Whipple Charger and Intercooler, 10lbs Boost, 944 Trans, Custom HD Clutch.
"simsport" said....superchargers are better than turbos its official!....
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