The original MGB 18V engine had a single row timing chain that altered the timing to offer more power at the low RPM end. This revised timing was likely better for the single carb set up that came a little later and quite possibly helped with lower emissions as well. It also made for less power as the poor MGB was slowly strangled.

Since this engine is being rebuilt to updated 1967 specs I have updated to the double row chain and gears, the setup that was used on the original 1967 MGB GT engine. This give more power at high RPM’s, sounds like fun.

Before installing the camshaft thrust washer I checked the camshaft endplay (endfloat) and fortunately it’s exactly where it should be at .oo4. Can’t ask for better than that!

MGB camshaft thrust plate installed
MGB camshaft thrust plate installed

The timing gears and timing chain installed with the two dimples on the gears lines up. This should be correct but I’ll reconfirm this configuration.

Installed timing gears and timing chain
Installed timing gears and timing chain

Finally the chain tensioner is added. At this point nothing is securely fastened down, I’ll do that once I’m positive that everything is correct.

MGB chain tensioner installed
MGB chain tensioner installed

Have I mentioned how much I like the colour of this engine? I can’t wait to install it in the MGB with its’ newly painted engine compartment. It should look really stunning.

At the back of the engine I test fit the 1972 18V flywheel which will be used. This flywheel is heading off to be resurfaced in the next week or so. There’s no sense in doing this much work and leaving the old flywheel to chew up the clutch.

Test fitting the MGB flywheel
Test fitting the MGB flywheel

2 COMMENTS

  1. Where I’m going to get a little more power is I’m using the 1972 big valve head which has a smaller combustion chamber than the original. In 1972 this head was coupled with deeply dished pistons giving something like an 8:1 compression ratio. I’m using lightly dished pistons, should see a compression ratio of about 9.5:1. I installed a standard cam but debated something hotter. Cost was the factor at this point.

    I expect the engine will require premium gas.

  2. Love these highly detailed explanations & pictures. Always wanted to better understand the changes to the MGB power plant as well over the course of its production. What enhancements are you making too this engine for added power?

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