914-6 conversion question, what else do I need? Options

[Mr_Chu]

Ok, so I have a 914 and also a 911SC. I am going to throw in the 3.0-liter motor into my 914.

I have to change the oil tank, I have to do the ring and piston thing, motor mounts, heat exchangers and new oil lines and stuff. What else do I need to do?

I know I have to upgrade suspension and braking, but what else do I need in order to swap motors and tranmission? Do I need to modify anything else? I pretty much have all the pieces to do the conversion, the problem I'm having is actually starting!

Any comments, suggestions, or missing parts I might need to do the full swap?

This conversion is starting to be a nightmare and its also costing me a pretty penny! (IMG:style_emoticons/default/mad.gif) Any help would be greatly appreciated!

Also, thanks for the guys that gave me some pointers earlier. That really helped me out!

[lylegd]

1) The 3.0 liter motor will require use of a special flywheel.
2) Your 914 has a 12 pin electrical connector in the engine bay. Your 911 motor comes with a 14 pin connector. Some rewiring and a connector change is needed. You can refer to the George Hussey 914/6 conversion manual for more details or track them down on the internet.
3) You didn't say whether you were staying with the original fuel injection system or going with carbs as part of this conversion. Depending on your answer, you will then have to install the appropriate fuel pump.
4) What is your plan for upgrading your brakes? Your stopping power MUST match your going power! Brake upgrades is a topic all by itself, but you do need to come up with a plan. I do not recommend that you stay with the original braking system.
5) You should consider replacing your rear springs with slightly stiffer ones to handle the increased weight. Otherwise your rear end will sag even more then normal.
6) You will need to fabricate a modified shifter shaft for your side shifter transaxle. The original (rear long)
shaft will not fit because it interferes with the heat exchangers. How you do this will depend on a number of factors, what front motor mount you use, what exhaust system you use, The front short, straight shaft can be used as is but the second shaft that is under the engine must be modified.
7) Your throttle linkage needs to be modified. Do you plan on using the original 914/6 type pivot shaft mounted off the right rear side of the transaxle? If yes, then be advised that your current intermediate plate on your transaxle does not have the threaded hole to mount this shaft. You have options on how to proceed, you can back date your intermediate plate to an early 911 one with the threaded hole, you can fabricate an externally mounted pivot shaft, you can bypass the pivot shaft completely with a custom built throttle linkage.
8) Replace your tachometer with one that will work with the 6 cyl. motor. (The electronics are different between the 4 and 6 cyl. tachs. You may also want to consider adding a 911 type oil temp and pressure gauge but that is up to you.
9) Have you found other Porsche owners in your area that have done this job before? You will need a support group to help you with all of the questions you will have. Then you can look at how they did it and ask them questions. This will save you a ton of time and money. Doing a 6 conversion is expensive but having to do things two or three times makes it even more so. Have you joined the local PCA club? Have you attended any of their tech sessions or other meetings? Those are ways to meet some of these people that have similar interests. Also there are many websites and chat groups that can help you.
10) If you haven't already done so, then you need to come up with an overall game plan. a) what is your objective? Is it a daily driver, an autocrosser, a show car? Based on your answer, you can then list the features you want the car to have, then based on those features you can brain storm a list of options to accomplish them. Then you choose what option you want to go with. If you do this, it will reduce but not eliminate false starts and minimize buying parts that you don't need/can't use. It will also force you to come up with realistic plans, cost estimates and timelines.
Lyle