Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum - View Single Post - KA/L-series block crankshaft specifications

geeaj · 05-13-2002, 09:54 PM

I was sitting on the shitter last night pinching a loaf and decided to pickup my old trusty "How to modify your Datsun OHC engine" book for some good reading....

Some interesting info:
- L20b, Z22, Z24 cranks have six 12mm flywheel bolts
- L20b cranks are fully counterweighted
- All Nissan/Datsun have the same 49.97 connecting rod journals. (now, i'm not sure what size the ka crank journals are, but they should be the same since a z24 crank is basically the same)

Stroke:

L20b - 86.0mm
Z22 - 92.0mm
Z24 - 96.0mm
KA24E(DE) - 96.0

Main Bearing Journal Diameter

KA24E(DE) - 59.942mm
Z24 - same
Z22 - same
L20b - same

So what does this mean? There seems to be tons of choice as far as building a destroked KA motor, one that can potentially rev with a sr20. How about a destroked ka running about 2.2liters with a Z22 crank? Perfect medium between sewing machine and stump puller. Don't like that, prefer to rev? Then you can put in a L20B crank (which are very cheap on the z and 510 boards) and turn the ka into a 2.0 liter buzzsaw. Being that the L20B crank is fully counterweighted, it should be very stable at high rpm.

Some food for thought, err, digestion..... <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/blush.gif" border="0" valign="absmiddle" alt=':blush:'>

05-13-2002, 09:54 PM	#1
geeaj Zilvia Junkie Join Date: Dec 2001 Posts: 357 Trader Rating: (0)	I was sitting on the shitter last night pinching a loaf and decided to pickup my old trusty "How to modify your Datsun OHC engine" book for some good reading.... Some interesting info: - L20b, Z22, Z24 cranks have six 12mm flywheel bolts - L20b cranks are fully counterweighted - All Nissan/Datsun have the same 49.97 connecting rod journals. (now, i'm not sure what size the ka crank journals are, but they should be the same since a z24 crank is basically the same) Stroke: L20b - 86.0mm Z22 - 92.0mm Z24 - 96.0mm KA24E(DE) - 96.0 Main Bearing Journal Diameter KA24E(DE) - 59.942mm Z24 - same Z22 - same L20b - same So what does this mean? There seems to be tons of choice as far as building a destroked KA motor, one that can potentially rev with a sr20. How about a destroked ka running about 2.2liters with a Z22 crank? Perfect medium between sewing machine and stump puller. Don't like that, prefer to rev? Then you can put in a L20B crank (which are very cheap on the z and 510 boards) and turn the ka into a 2.0 liter buzzsaw. Being that the L20B crank is fully counterweighted, it should be very stable at high rpm. Some food for thought, err, digestion..... <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/blush.gif" border="0" valign="absmiddle" alt=':blush:'> __________________ Beware the fury of a silent man, be more cautious of his silent farts....