Notices
964 Forum 1989-1994
Sponsored by:
Sponsored by:

964 PPI and compression results

Thread Tools
 
Search this Thread
 
Old 05-19-2011, 05:33 PM
  #1  
f3nr15
Racer
Thread Starter
 
f3nr15's Avatar
 
Join Date: Sep 2006
Location: Auckland NZ & Newcastle AU
Posts: 437
Likes: 0
Received 1 Like on 1 Post
Default 964 PPI and compression results

Hi all;

I am looking at a 1993 model 964, with lowish mileage (~31K miles), and in very good condition.

It's priced at 993 money, but later model C2s are a little scarce Down Under.

With the PPI, the only major issues are that the front bump stops are split and the front control arm bushes are split, and so will require replacement.

There's a "sweat" of oil at the rear transmission area (not worth worrying about according to the workshop).

A few minor things like the rear wiper being out of action, AC not working, engine undertray has perished, and oil gauge is fogging up.

The PPI has shown the following results for the compression test:

1. 191 2. 180 3. 185 4. 188 5. 192 6. 190

(Leakdown not performed)

How big of a job is the replacement of the front control arms/bump stops?

What do you think of the compression in the number 2 cylinder?

TIA!
Old 05-19-2011, 05:48 PM
  #2  
Laker
Drifting
 
Laker's Avatar
 
Join Date: Sep 2010
Location: Philly 'burbs
Posts: 2,591
Received 18 Likes on 16 Posts
Default

General rule is there should be no more than a 10% difference between best and worst cylinder. You are getting close between 2/5.

A couple of drops of oil in #2 and re-running the test will shed some more light.
If compression improves, worn rings, if it doesn't worn valves.

Because of a work commitment, I only got a compression test, but no leakdown. Wish I had though for nothing more than peace of mind. I can only speak to the drop links which need to be inspected from above with the wheel removed (Can't see them from underneath on a lift.) Make sure they were checked out. They were easy to replace. Good luck and keep us posted.
Old 05-20-2011, 09:27 PM
  #3  
f3nr15
Racer
Thread Starter
 
f3nr15's Avatar
 
Join Date: Sep 2006
Location: Auckland NZ & Newcastle AU
Posts: 437
Likes: 0
Received 1 Like on 1 Post
Default

Thanks Laker!

I suppose that with the compression, still being within the 10% variance is acceptable, though? By the workshop's assessment, the engine runs very well, including a road test. They commented that it was one of the best examples they had seen.

I'm not averse to a top-end rebuild in the future, am quite expecting it in fact; I'd just prefer not to have to do it in the next 5 years, I won't have the $ for it before then!

Anyway, am going to try to secure the deal, fingers crossed.
Old 05-20-2011, 09:35 PM
  #4  
johnsjmc
Racer
 
johnsjmc's Avatar
 
Join Date: Mar 2010
Location: London Ont. can.
Posts: 464
Likes: 0
Received 3 Likes on 3 Posts
Default

Low mile cars often sit long periods and a good run will probably help even out the compression. New lower control arm bushings are about a 2-3 hour installation. Urethane bushings ( Walrod bushes) and rubber replacements are available from Elephant racing. Either set is around $100 here. Much cheaper than replacing the lower control arms. I am unsure of what bumpstops involve. AC repair can be simple recharge or expensive.
Old 05-20-2011, 09:37 PM
  #5  
christallon
Rennlist Member
 
christallon's Avatar
 
Join Date: May 2007
Posts: 2,944
Likes: 0
Received 203 Likes on 136 Posts
Default

The difference is really slightly higher than 6%. No big deal. Those are very respectable numbers, really. The rest is a little elbow grease. The work does not sound too difficult, but I can't comment on doing it yourself. is it a 5 speed coupe? What color combo. You'll love the car!
Old 05-20-2011, 11:02 PM
  #6  
f3nr15
Racer
Thread Starter
 
f3nr15's Avatar
 
Join Date: Sep 2006
Location: Auckland NZ & Newcastle AU
Posts: 437
Likes: 0
Received 1 Like on 1 Post
Default

It's indeed a 5-speeder. Wimbeldon green with black interior. Some of the vendor's pics -









Old 05-20-2011, 11:17 PM
  #7  
Laker
Drifting
 
Laker's Avatar
 
Join Date: Sep 2010
Location: Philly 'burbs
Posts: 2,591
Received 18 Likes on 16 Posts
Default

that is a nice color combo. You should point out to the dealer that the Distributor Vent Mod was not performed and it will need to be done along with a new Distributor belt.
Old 05-20-2011, 11:46 PM
  #8  
sml
Three Wheelin'
 
sml's Avatar
 
Join Date: May 2010
Posts: 1,564
Likes: 0
Received 1 Like on 1 Post
Default

I didn't think any 964 C2s and C4s came into Australia with air-bags?

Is it an import, or maybe I'm wrong.

Why not a C4?
Old 05-21-2011, 12:32 AM
  #9  
f3nr15
Racer
Thread Starter
 
f3nr15's Avatar
 
Join Date: Sep 2006
Location: Auckland NZ & Newcastle AU
Posts: 437
Likes: 0
Received 1 Like on 1 Post
Default

Laker;

The majority of 964s I've looked at haven't had the distro vent installed, strange.

sml;

It's a local delivery. Oz 964s had the airbag fitted for 1993. Over my search for a 964 over the last 2 years, I've considered both C4s and C2s without prejudice. I've really just been looking for one in the best possible condition. Although, I did think a bit about the issues with the brake bleeding for the C4s. Actually, almost bought a C4 last month, but wasn't satisfied with the PPI.

Oh, and I did consider ONE 993... :-)
Old 05-21-2011, 06:50 PM
  #10  
Rob in Oz
Instructor
 
Rob in Oz's Avatar
 
Join Date: Jun 2002
Location: Brisbane, Australia
Posts: 246
Likes: 0
Received 0 Likes on 0 Posts
Default

Hi

Looks like the one from Suffolk Park - top $$ asked that would make the US & UK guys on this board choke on their cornflakes! Looking at Carsales.com it seems that price expectations for 964s in Oz are on the rise...

Looks like you've been very patient with your search, unlike some recent posters...
Good luck - hope it works out.

Rob
Old 05-21-2011, 09:16 PM
  #11  
f3nr15
Racer
Thread Starter
 
f3nr15's Avatar
 
Join Date: Sep 2006
Location: Auckland NZ & Newcastle AU
Posts: 437
Likes: 0
Received 1 Like on 1 Post
Default

Haha, learned my lesson the hard way with my current '76 911 - purchased without a PPI, bit of an oil leak and some crunching gears, prob no big deal, right? Dropped her off for a service and then picked her up from the workshop... After 9 months!!! Total engine and gearbox rebuild.

That was 4 years ago, absolutely love her still, hoping to be able to keep 2, but that's going against the wife-approval-factor for now.

Prices of average to poor 964s, as well as tiptronics, have continued to drop, but excellent examples of SCs, Carrera 3.2s and 964s are definitely going UP.
Old 05-22-2011, 12:40 PM
  #12  
braol
Advanced
 
braol's Avatar
 
Join Date: Dec 2006
Location: San Diego, CA
Posts: 85
Likes: 0
Received 0 Likes on 0 Posts
Default

Bumpstops are no big deal, even split ones will do their job. Replacement is just a matter of removing the front shocks from the struts and replacing the stop....replace the shocks themselves while you're in there. If the stop is that bad you may still have original shocks in there. Heck, on an old VW of mine I replaced a bumpstop by cutting a new one completely through on one side, slipping it over the shock and putting some epoxy inside where I cut it.
Old 05-22-2011, 12:52 PM
  #13  
Laker
Drifting
 
Laker's Avatar
 
Join Date: Sep 2010
Location: Philly 'burbs
Posts: 2,591
Received 18 Likes on 16 Posts
Default

Originally Posted by f3nr15
Laker;

The majority of 964s I've looked at haven't had the distro vent
well it has to get done and is perhaps a bargaining chip.



Quick Reply: 964 PPI and compression results



All times are GMT -3. The time now is 08:43 AM.