GTI-Z Posted March 21, 2011 Posted March 21, 2011 Can't seem to find any reference on the forum regarding this, but, here goes. Obviously there is a significance to the numbers on the head (E88 etc) and the block (P30 etc). Is there any significance to the number cast into the crankshaft? I just noticed as I was dismantling the engine that there is a number cast into the crankshaft on the counterweight next to the front main bearing. Anyone with any ideas on what the numbers signifies? Brad Quote
HS30-H Posted March 21, 2011 Posted March 21, 2011 It's the second half of the Nissan part number. You can look them up in the factory parts lists. Those 'E88' and 'P30' numbers are the same thing, only even more abbreviated. You could call your pictured crank an 'E41' by the same process. Quote
GTI-Z Posted March 21, 2011 Author Posted March 21, 2011 Thank you - however, that has just whetted my appetite! The crank is from a Oct-Nov 71 (estimated) build L24. What advantages/disadvantages would this crank have compared to a crank from a 240K or 240C, and how would a crank from an L24E compare ? I am just curious as different L6 blocks and heads have their pluses and minuses. Brad Quote
HS30-H Posted March 21, 2011 Posted March 21, 2011 You could call your pictured crank an 'E41' by the same process. Whoops. Typo. I meant 'E31' of course..... Well, apart from the obvious ( usually a superseding / later part number would indicate an improvement or modification over the original part ) you might find that ends up being similar to the 'which head is best?' type of discussion, which is subjective, and what with subjectivity itself being subjective, it all gets quite confusing.....! But just on the subject of 'normal' 73.7mm stroke L24 cranks with the 'normal' sized bearing journals, there's not that much difference between them. You just want to avoid the really early ( late 1969 / early 1970 ) production version, as it suffered from a lack of counterweighting that gave rise to a nasty harmonic at certain engine speeds. This was immediately superseded by a design with improved counterweighting. Quote
GTI-Z Posted March 22, 2011 Author Posted March 22, 2011 So, nothing as exciting as the heads and blocks ! Thanks for the lesson I seem to learn something new from the forum every time I browse. By the way, I must remember to put some info into the projects section of the forum. Brad Quote
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