Big bore rebuild Options

[Damo]

Hi all and happy new year. I’m new to the forum but have owned my 914 for around six years now. I’m doing a full strip down and rebuild of my stock 1.7 engine but have chosen to add a Biral big bore to the standard case. I have noticed that I don’t have any main bearing dowel pins in my case ? Are these fitted to all engines or just the later 1.8 and 2.0, just need to confirm if I need them. Also would like to keep my stock FI system so would need some advise on how to tweak the injection to run the bigger engine, should I fit 2.0 injectors or just rotate the mixture on the ecu ? Any advice will be appreciated. Thanks.

[VaccaRabite]

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The lack of dowel pins is troubling. Have the case measured for sure before buying anything. I think bearing now are more available then the were a few years ago, but its still easier to get bearings in standard then plus sizes.

Since you have a 1.7, your easiest "bog bore" that will run on DJet is a 1911. That means your stock crank and 96mm pistons. This will give you about 110-120 crank hp.

I do not think that Biral is needed with 96mm and djet. Standard cast iron will be fine. If you go over 96mm, then you will need the better cylinders (and you won't be running Djet.)

Good luck!
Zach