29 August 2010, 18:39
Wel lees ik onderstaande over de B230 op Wikipedia. Ben niet zeker of het een vooruitgang was ten opzichte van de B23....
In 1985 a revised, "low friction" design was introduced, dubbed the B200 and B230 (depending on displacement).
The improvements were different, longer rods (152 mm c-c, 7 mm (0.3 in) longer), pistons with a lower compression height, lower friction bearings (smaller in size) ,a crankshaft with 8 counterweights (instead of 4 on the older Bxx engines) and a heavy harmonic balancer in the crank pulley.
However, the robustness of the reciprocating assembly was decreased. The engine rods were thinned to 9 mm (0.4 in), the crankshaft design and fabrication were altered and thrust bearing placement was moved from number 5 journal (B21/23) to the number 3, together with smaller bearings. This low friction design was used throughout the remainder of the "red block" production.
In 1985 a revised, "low friction" design was introduced, dubbed the B200 and B230 (depending on displacement).
The improvements were different, longer rods (152 mm c-c, 7 mm (0.3 in) longer), pistons with a lower compression height, lower friction bearings (smaller in size) ,a crankshaft with 8 counterweights (instead of 4 on the older Bxx engines) and a heavy harmonic balancer in the crank pulley.
However, the robustness of the reciprocating assembly was decreased. The engine rods were thinned to 9 mm (0.4 in), the crankshaft design and fabrication were altered and thrust bearing placement was moved from number 5 journal (B21/23) to the number 3, together with smaller bearings. This low friction design was used throughout the remainder of the "red block" production.
