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Location: Rijswijk, ZH
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Engine is going in today (with luck) and then I will know for sure. From what I can tell, it will be tight but OK. I will let everyone know what the outcome is D. |
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07-31-2025, 06:12 AM
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Since this thread is the equivalent of what we used to call a "party wave" in Hawaii (everybody gets to ride- no priority!), I'll continue to post re my build here...
I am working to equalize my combustion chamber volumes. After re-measuring all of the rebuilt cylinders, I found that I had chamber volumes ranging from 89.5 to 92.0 cc, with no apparent difference in the height of the valve faces. I decided to measure the depth of each "flycut" in the head, and found that these varied as well.... So I listed the cylinders from smallest depth to largest depth, and looked at the measured cc's of each. I took one cyl that had a larger depth, but a smaller cc volume, and swapped the valves from it into the cylinder that had the larger depth and a larger cc volume. I managed to move each chamber volume -0.55cc and +0.75cc to get them closer to equal. So my 89.5cc chamber increased to 90.25cc, and my 91.8cc chamber decreased to 91.25cc. I have some more swapping to do, but my individual cyl head CR variance went from 0.3:1 to 0.2:1 with just this one swap. My goal is to get the individual cyl CR variance down to .01:1. I will have to have a slight amount of material ground off of the valve margins in the 90.25cc cyl head to get there (I'll need to sink each valve to get +0.5cc per valve). I haven't done the math yet, but I don't think this will require much material to be removed. I have plenty of margin left on the valves to do this, I believe. After I get the chamber volumes as close as I can, I will need to figure out how much variation you can have from head-to-head for the cam housing mating surface. Right now, I've got three heads grouped together that will have a max height difference of .0001" and another group of heads that have a max height difference of .0012" (might have to get one of more of those machined?), "Cylinder heights" is my term for the measurement from the cam housing mating surface to the cylinder head to cylinder mating surface (thickness of each head).  Before I started swapping valves: 
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Dave 1985 Porsche 911 Carerra Coupe 3.2 to 3.4L PCA Member- Sacramento Valley region Last edited by 85RedCarrera; 07-31-2025 at 08:31 PM.. |
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07-31-2025, 08:22 PM
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Lots of options for you. Did my 3.4 build last year to these specs:
Euro Mahles Carillo Rods Single plug heads reworked Sal Carecellers reworked ECU Modified Intake, eliminated MAF with cold air intake Larger Throttle Body 993 Injectors 993 SS cams Clewett wires Patrick MotorSport lightweight flywheel Sachs power clutch Roth Sport Light Weight Crank Pulley Bill Boat BB 1 3/4 headers with heat BB Muffler Runs strong in my 2080 lb early 911 long hood
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Banda 69 911T 3.4 ltr. Outlaw build 72 BMW 2002ti Alpina "Pig Cheek" build Last edited by banda; 07-31-2025 at 09:13 PM.. Reason: description |
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07-31-2025, 08:46 PM
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My build is budget and CA smog limited...!
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Dave 1985 Porsche 911 Carerra Coupe 3.2 to 3.4L PCA Member- Sacramento Valley region |
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08-01-2025, 07:56 AM
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I feel for you on the smog checks in CA i remember the hassle on my 84 Carrera and the frustration with getting it to pass. That is why i got into pre 76 cars when i lived in Cali. i just wanted to avoid the hassle with CARB
I heard Jay Leno's law might pass with a 30 year rolling exemption which will be great for your build. and all the other classic car owners in Cali
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Banda 69 911T 3.4 ltr. Outlaw build 72 BMW 2002ti Alpina "Pig Cheek" build |
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08-01-2025, 10:48 AM
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In 2028, 1981 and earlier will be exempt, etc.... so every year they will add another year of exempted vehicles. I've got a long way to go with my 1985. My last 911 was a 1974, and I bought it for the very reason that you stated. I was all set to look for another '75 or earlier car, when a friend agreed to sell his '85 to me. So here I am. {BIG EDIT} Regarding measuring my chamber volumes: It took me quite a lot of trial and error to discover a proper, repeatable, reliable method when using my plastic burette. Very long story short- all of my chamber volumes are within 0.5cc's except for one, which has the smallest chamber (88.5cc)
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Dave 1985 Porsche 911 Carerra Coupe 3.2 to 3.4L PCA Member- Sacramento Valley region Last edited by 85RedCarrera; 08-03-2025 at 11:13 AM.. |
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08-01-2025, 01:53 PM
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Got the engine in the car - much frustration as my nice high lift AC Hydraulic jack fouled the fancy engine cradle I bought from our host and I was unable to tilt the engine sufficiently to get the transmission shaft into the car. Ended up jacking the back of the car up....in it went. Two issues. First, I do have the 100 mm intake manifolds and yes, they are too high to allow the air cleaner to fit. The "short" manifolds are 84 mm, so about 1/2" shorter, not sure that is enough to make the difference....but I am researching it. Second, for some reason the muffler will not clear the sheet metal....so I had to pull it off and now I have to figure out if it will fit at all..... I'll start another thread so I do not change the topic of this one.... D. |
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08-01-2025, 02:28 PM
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Hopefully you can post here of a positive outcome. Good stuff you have been posting. I started the thread and here I am months later with a totally different build. Your post, and others have been good for me and hopefully those thinking about doing these 'upgrades'. Some of it is probably technical for some just starting engine work, but seems like the flow has been good for those contributing. Keep us all in the loop and hopefully others with 3.4 or other builds can contribute as time goes on... Our mistakes or less than stellar outcomes can be learning experiences for others down the road...  Erik
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1986 911 Coupe 1986 911 Targa Last edited by fallingat120mph; 08-05-2025 at 12:48 PM.. |
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08-05-2025, 12:42 PM
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Little off topic but thought I would share in regards to 3.2 to 3.4 builds. These are the 41mm OD heat exchangers I just received from Dansk/SSI (Europe). Also came with new oil lines and a muffler in a kit. Instead of the 2in/1out muffler that came with the kit am going with a 2in/2out from RarlyL8...
Thought I would share before the install:   Erik
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1986 911 Coupe 1986 911 Targa |
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08-10-2025, 11:37 AM
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Dave 1985 Porsche 911 Carerra Coupe 3.2 to 3.4L PCA Member- Sacramento Valley region |
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08-11-2025, 07:34 AM
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Should be finishing the rebuild in the next few weeks. Just waiting on a muffler.... Cautiously nervous for the start up, the break in and the new "sound". Erik
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1986 911 Coupe 1986 911 Targa |
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08-11-2025, 10:20 AM
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Man, some cool stuff in here, this is my favourite thread.
Just an update on those putting in PMO's with a rear window wiper. The post-1974 rear wiper set up hits the ITB's so it either has to go or be backdated to the pre-74 set up. Since I spent an inordinate amount of time converting the rear wiper to intermittent, the parts to mount with the '73 mounting location are in transit. One step forward, one step back.... D. Last edited by Cloggie; 08-14-2025 at 04:23 PM.. |
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08-14-2025, 04:20 PM
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Ha, good for you! I actually sourced the entire rear wiper set up over the course of a couple years and once my new engine is in place and the bodywork and respray are done I am finally going to install. Been packed up for over 4 years waiting on the install. I grew up in Germany and the two 911's in my life back then had the rear wipers - guess it's a bit of nostalgia for me...that and side markers. I am sure it will kill my weight savings and aerodynamics per everyone from the forums Dropped off (at my shop) my heat exchangers, new oil lines, reprogrammed and chipped DME per Steve W., 993 coils, 964 dizzy, wires, and a whole bunch of other goodies and looking forward to head down to the shop next week to totally get in the way of my mechanic. Hopefully I will remember to take some photos. Probably another month with the paint and new engine install. Nice to be at the tail end. Erik
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1986 911 Coupe 1986 911 Targa |
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08-14-2025, 04:34 PM
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Progress again today.
Motec guy came over, checked out all the wiring - everything we checked (TPS, fuel pump etc) is working perfectly. I have some homework to do like measure the temperature sensor calibration, but then its oil, fuel, check for leaks and fire up! It will be broken in on the dyno... One major issue is that the CarGraphic exhaust gets in the way of the rear bumperettes and centre panel (it is a backdate) likely as the engine was moved about 25mm back to make room for the transmission. I am trying to figure out how to resolve it....but can't put the car on the road as bumpers are considered safety equipment. Sigh. D. |
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08-22-2025, 12:11 PM
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watching
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08-25-2025, 06:55 PM
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Having issues with heat ducting on my 3.2 to 3.4 build and found this old thread. Wanting to keep the heat original and looks like this might be a work around and wondering if anyone has had similar issues or seen an alternative.
1986 3.2 to 3.4 build using the 964 distributor. Trying to keep the heat as I just installed new SSI heat exchangers for this sole purpose. Any insight is appreciated... Erik Photo and write up are from this thread: https://forums.pelicanparts.com/porsche-911-technical-forum/56887-3-2-3-4l-twin-plug-conversion.html  - The twin plug distributor interferes with the plastic duct that goes from the side of the engine fan up to the heater blower. A friend and I removed the duct and clamped it with some blocks of wood and then heated it up with heat gun to give it a factory looking bulge that clears the distributor. I was really proud of the way it came out. - The new twin plug distributor is also in the way of the plastic duct that feeds air from the blower motor to the heat exchangers. I modified the inlet of the stainless "T" that feeds air to the heat exchangers and made a new hole in the engine tin for a length of heater hose. This was not totally satisfactory. (The hose goes inside the "T" instead of being clamped on the outside and blows out sometimes.) I wound up not using the plastic elbow in the picture, it interfered with the motor mount.
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1986 911 Coupe 1986 911 Targa |
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09-03-2025, 02:18 PM
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Erik, I know you are way down the road on this project, but let me ask: Did you consider the CLewett dual plug setup? No distributor to get in the way and need maintenance, just coils on or near plugs, about $2000. If so, why did you choose the 964 dual distributor?
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1973.5 911T with RoW 1980 SC CIS stroked to 3.2, 10:1 Mahle Sport p/c's, TBC exhaust ports, M1 cams, SSI's. RSR bushings & adj spring plates, Koni Sports, 21/26mm T-bars, stock swaybars, 16x7 Fuchs w Michelin Pilot Sport A/S 3+, 205/55-16 at all 4 corners. Cars are for driving. If you want art, get something you can hang on the wall! |
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09-03-2025, 04:21 PM
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Hmm...well, that is a good question. I guess I had all the parts and bits to make it easy. I knew I would be sending my DME to Steve W. for refurbishment and after talking to him about his DME conversion for dual plug seemed pretty simple from there. I guess I was stubborn - do to having all these parts around me just setting and it seemed to keep with build I wanted to achieve. Absolutely looked at Clewett electronics and also their throttle body kits... Overall I am excited about things, just disappointed I hadn't had the foresight to think about the heat system per this thread question. Erik
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1986 911 Coupe 1986 911 Targa |
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09-03-2025, 04:39 PM
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85RedCarrera, i saw your old comment wondering about smog. About 10 years ago i redid my '88 to a 3.4L, single plug w/ 964 cams. Still running stock Motronic with a custom chip. Also stock heat exchangers and a aftermarket CA legal cat. It passes smog with zero issues, its emissions numbers are remarkably low. I've got somewhere around 20k miles on the engine. Dyno tuned shortly after break in, 252whp/235ft-lbs with no muffler at the time. I think this dyno is pretty generous... more important than the numbers is its a strong engine. I think the CR was 9.6:1, but id need to check my records to confirm. Running safely on 91oct was a requirement.
At the time, i probably would have gone wild and did a twin plug / ITB setup if i didnt need to contend w/ smog. Looking back, wish i had just done a 3.6 swap... 3.6's are double the price nowadays .
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Jon 1988 Granite Green 911 3.4L 2005 Arctic Silver 996 GT3 Past worth mentioning - 1987 924S, 1987 944, 1988 944T with 5.7L LS1 |
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09-03-2025, 09:33 PM
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Sweden Engine Heat?
Erik,
After seeing this photo a while ago, I did some ROW PET digging and found the heat setup appears to be from a Sweden engine. Here's my findings post from 3.2 Twin Plug heater duct clearance Quote:
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09-05-2025, 08:24 AM
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Carina
Coupe
Targa
Coupe Redo
The Kraut Burner
The Bratwurst Burner
Das Boost
