Welcome to the latest instalment of our DIY Mini Restoration series! This guide revisits the Bogus 2 Mini build, focusing on the crucial task of setting up cam timing. Whether you're a seasoned enthusiast or a novice builder, precise cam timing is essential for optimal engine performance. Follow our detailed steps and practical tips to get your Mini running perfectly
Cam Timing Setup for Bogus 2 Mini Build
Setting Up Cam Timing
Installing the Adjustable Duplex Vernier Timing Chain Kit
We started by fitting an adjustable duplex vernier timing chain kit. This kit offers the same strong chain as a fixed duplex kit but allows for more accurate cam timing. Precise cam timing is crucial, especially when using a non-standard cam. If cam timing is off, engine performance is significantly compromised.
Tip: Ensure the cam timing chain sits flat. If not, gears may need to be shimmed, indicating a worn crank. In cases of excessive wear, consider a new crank. Duplex chains reduce stretch, a common issue with standard simplex chains. Alternatively, dry timing belts offer performance advantages but require frequent changes.
Setting Up the Cam Timing Disc
Attach the cam timing disc to the crank. Using a piece of wire attached to one of the bolts through the backplate, set up an indicator after verifying that the crankshaft is at TDC (Top Dead Centre) on the requisite cylinder.
Confirming Full Lift on Inlet Valve Number One
Use a dial gauge to confirm full lift on inlet valve number one. This cam timing is set to 106 degrees, as specified by Kent Cams for the 286 cam profile. Release the six bolts in the front of the top cam pulley to allow for adjustment.
Tip: It's beneficial to have assistance during this step. One person should check the cam timing and lock off the vernier’s bolts, while the other monitors valve lift while cranking the engine. This process requires precision and patience.
Including the Oil Thrower and Cam Chain Tensioner
- Oil Thrower: Positioned on the end of the crank, the oil thrower helps protect the oil seal and reduces the chance of leaks. Some builders mistakenly leave this off.
- Cam Chain Tensioner: Even when upgrading to a duplex chain, a new tensioner should be fitted. Without a tensioner, cam timing will be imprecise due to chain flapping. Press the tensioner against the chain while cranking the engine in its normal rotation.
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Check out our gearbox components and accessories to find everything you need for your build. Stay tuned for more detailed guides in our DIY Mini Restoration series!
By using high-quality components, you'll ensure your Mini engine's cam timing is perfectly set, leading to improved performance and reliability. Happy building!
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Don't miss out on the rest of the Bogus 2 Series!
This blog series is your go to for a guide to taking your Mini from a bare shell to a road-worthy classic. Check out the rest of the series for tips and advice from our Mini Experts for every stage of your Mini restoration!
This guide is meant to provide general guidance and a step-by-step approach to build your Mini's Gearbox. It is always recommended to contact a trusted professional if you are unsure about any part of the process or lack the necessary tools and experience.