Lotus 900 series performance cylinder heads and Lotus 900 series engine upgrades

Cylinder Heads

Lotus 900 series engineGas flowed and CNC machined, new valve guides, valve seats cut to match Lotusbits designed waisted valves. Vaqua blasted, skimmed, supplied ready to fit - £1200 (exchange). Chamber volumes can be adjusted to suit from 32cc to 42cc.

Pistons

2.2 Ultralight pistons and conrods, lightweight, smaller pins, longer rod length - this improves conrod angularity allowing the engine to rev higher.
Safe for 8500rpm. Compression ratio from 10:9 to 12.5:1, dependant upon chamber volume - £1200.

2.0 pistons and conrod set, lightweight, smaller pins, longer rod length - this improves conrod angularity allowing the engine to rev higher. Compression ratio upto:11.8:1 - £1200.

Engine Upgrades

Initially use the Lotus parts bin to upgrade to the Lotus 912 HC spec (180bhp).

After this:

Step 1

2.2 litre (Developed in Lotusbits Lotus Sunbeam rally cars)

This is aimed at road use or clubman competition cars

For competition cars there are further modifications required to the sump and oil system

 

Step 2

2.2 litre (Developed in Lotusbits Lotus Micra and Lotusbits Lotus Sunbeam

This is aimed at competition cars

 

Custom Lotusbits pistonStep 3

2.5 Litre Road use (Detuned version of the current Lotus Sunbeam competition engine)

Contact Lotusbits for further technical details

 

Longstroke custom Lotusbits crankshaftStep 4

2.5 Litre Competition use (Currently used in both Lotusbits Lotus Sunbeams, 2014 season)

.pdf download for further information regarding "Improving your Lotus" (3.7mb)

Contact Lotusbits for further technical details

Lotus Excel, exclusive polished alloy gear knob and seat knobs
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