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rwratschko

hole groove main bearings

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ive got an 907 engine spec 5 from an lotus eclat (probably)

as my workshop manual says i need holes and grooves in all mein bearrubngs (lower and upper)

the bearrings taht were in the car were completly different.

lower : plane

upper : hole & groove

in the lower engien block part (crank holder) are no oil holes for the new bearings....

is this normal and ok? or do i have a "wrong" lower engine block part maybe from an lotus esprit turbo 910 engine ?

Edited by rwratschko

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From the fact the carrier has no holes, the bearings you have seem to be the correct type.

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Check you have a cross drilled crank (i.e it has an oil feed on opposite sides of each main bearing journal. This is what determines whether you should have plain or grooved bearings.

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in which case your upper and lower shells must be grooved

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