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Author Topic: Spyder restoration - long time coming  (Read 44643 times)
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« Reply #420 on: November 24, 2021, 08:25:37 AM »

For performance Inlet 0.40 exhaust 0.45 should be the target with a standard engine. These clearances are huge compared to modern engines and modern cams. Tighter clearances have the valves open for longer. To play with things like this you need a head off engine and dummy belt/tensioner rig to study open close points potential valve clash etc. I am not recommending halving clearances (what you see with aftermarket cams) with Standard cams. I just wanted to provide some insight into what small clearances mean. Note valves that do not close enough equals compression loss and mixture blown down the exhaust pipe.

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« Reply #421 on: November 24, 2021, 09:55:59 PM »

I ordered the two shims from Eurosport yesterday afternoon and amazingly they arrived in the post today. Well impressed with their response to the order. I was also a bit concerned about if I have measured correctly, but need not have worried as they measure as expected. Next up putting them in the engine.


Beta Spyder S2 pre F/L 1600
Saab 9-3 1.9Tid Cabrio
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