Lotus Elan

Cross drilling pressure drop ?

PostPost by: SJ Lambert » Wed Feb 18, 2015 10:59 am

P1100451.JPG and

So, I could squeeze in at the front, centre or even rear of the main oil gallery (engine doesn't mount off the traditional mounting point - oil filter head does - could even juggle that a bit if necessary....)..........
Ford Escort Mk1 Lotus Twin Cam
Elfin Monocoque (Twin Cam)
Elfin Type 300 (Holbay S65 - 120E) mechanic

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PostPost by: rgh0 » Wed Feb 18, 2015 12:25 pm

If you have an alloy block with no cross drilling then you certainly need a tapping on the exhaust side gallery.

If you have a big bore, long stroke and more flexible alloy 2 litre block BDA running at 10000 rpm then getting enough oil to a rear main that is being hammered by big weights at high speed and flexed out of alignment with vibration may be an issue.

For a iron block 1600 twink it just does not appear to be necessary at least in my experience. I am sure it can be done but I am not sure if it needs to be done

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