Somehow I have several 2.8 cranks but no 2.4's. Anybody got a spare 2.4 crank with which they can part ways?

Yes! The Club parts car (1971) still has the engine in it.

EMail me: Frank(at)CTZCC.Com!

I bet Vinny has one hanging around his shop that he would sell and/or
install, that way you wouldn't have to take your engine out in the cold
and tear it apart for one component. One never knows when one might
need an extra, early engine, does one? (hint, hint).
~Rick~

Hooray the club parts car saves the day again!

Surprisingly Vinnie only had 2.8 cranks lying around - he's the one building the motor for me. Somehow between the 2 of us we ended up with all 2.8's, I can't fathom what became of the crank that came out of my 240Z 15 years ago...

You can expect to find your original 2.4L crank the day after you pull the one in the club parts car....

_________________
Phil
1981 280zxt - Now in the care my son!
2014 370Z Sports Touring Roadster

I have a 2.4 crank here, too..still inside a perfectly good short block. It's down in my basement. I was gonna take that motor apart to sell the con rods and if you want the crank you just hafta come get it.

_________________
71 on a rotisserie, two more in pieces in my shed...and a 69 1600 waiting for me to get to it

THERE'S your deal, Tim!!!

Man, I love this Club!

Lately I've been hearing of a 3.1L stroker engine. Would a 280 crank in
a 240 block accomplish that, or is it done some other way? (I'm thinking
of how back in the day we used to make a 301 (some say 302) SBC by
using a 283 block with a 327 crank..............) And would that be desir-
able in Marc's car for improved performance which wouldn't be visible
from the outside?
Just thinking out loud.......................~Rick~

_________________
All Z Best,.......Kathy & Rick

1969 Z.CAR (#00013 10/69) 8/30/76
1969 ITSA.Z (#00171 11/69) 8/24/73
1970 OLD.Z (#06289 6/70) original owner
1971 510 2dr since 12/31/75
1969 1600 rdstr (our 160-Z)
1971 (#19851 1/71) sold
1975 75.Z (#01343 1/75)

The most popular stroker build uses the crankshaft from an L-28 diesel (found in maximas), con rods from later 2.4 motors, and pistons from a KA 24 motor (240 SX among others). The block is a bored out 2.8. The prices for diesel cranks have gone through the roof over the last few years, from about 200 to as much as 700. There are some aftermarket stroker cranks but they are rare and even more expensive, and of course some guys are buying forged aftermarket pistons. A set of con rods from a 240Z motor sells for about 100 bucks as long as it's the later models with 9 mm rod bolts. (early 240's had 8mm rod bolts).
Lately I've been selling 240 blocks for scrap but taking the con rods first. I've scrapped two in the last couple years, and have two more to go. Both of mine are perfectly good motors, one has only 130k miles, but nobody wants 2.4l motors anymore when a 2.8 fits right in and can be gotten for a couple hundred bucks.
As for whether it's desirable...even when you build a stroker with mix n match parts, it gets wicked expensive very fast. The block has to be bored, the parts have to be procured, and the entire rotating assembly has to be balanced. I drove a professionally built stroker with triple webers and a highly modified head a few years ago, and i did not think that there was a huge improvement over the old motor, which had been a 2.8 with the same carbs and head.. The improvement didn't match the expense.
If you want stock looking motors with nice performance, I think tyou are better off spending the money on good head work. A stock 2.8 liter motor with a properly modified head will haul along very nicely. And if you want to go fast fast, put in a stock turbo motor but run a t3/t4 hybrid turbo with an intercooler. It doesn't look stock but it can make 350 hp at the rear wheels, so who cares?

_________________
71 on a rotisserie, two more in pieces in my shed...and a 69 1600 waiting for me to get to it

Mark C is right. I am in the middle of building my 3.0 liter turbo motor right now. Plenty of people told me head work is where the real gain is. I wanted to have something a little differnt and got my block on a trade of parts. There has been some major $$$ in the head to go with the 3.0 block. I have driven a stock 2.8 turbo with a nice upgraded turbo ahd feel that is the most bang for the buck. Also the fact this turbo build has way more money into it than my v8, I can't really see why people dump the money into the L's unless you just want to.

I guess in the back of my head, I am hoping my little 3.0 motor makes 500whp.

It will be close.

_________________
Clive Bogle President - New York Z Car Club - NYZCC.COM
1971 240Z - LS1/T56
1974 260Z-L30
1976 Fairlady Z

Depending on the induction system (including a turbo), 320-390 hp is realistic, but not flexible for the street.

Frank, there are Z cars out there that but that number down on a stock block and head.

500 is def within reach.

_________________
Clive Bogle President - New York Z Car Club - NYZCC.COM
1971 240Z - LS1/T56
1974 260Z-L30
1976 Fairlady Z

Yes, agreed.

Key word was 'realistic'.

What do you mean by 'realistic'? Maybe I am missing what you are trying to say. It is possible to have high HP cars and still be streetable.

_________________
Clive Bogle President - New York Z Car Club - NYZCC.COM
1971 240Z - LS1/T56
1974 260Z-L30
1976 Fairlady Z

Well, I'm keeping in mind that this is Tim's Wanted to Buy Thread, and that I'm talking to a man whose Z routinely puts 400+whp to the road, so briefly:

YES, the 6-cylinder L series can make gobs of rwhp and many racers are built up to the 500hp arena. But in order to make that poor little 3L engine make all those ponies, it costs a lot of money. Your Corvette V8 will easily produce that amount of power without over-stressing it, at far less cost. But an inline 6cyl Z engine has to work mighty hard to reach those figures. Any time you increase power, you reduce reliability. Racing engines only have to last a season (many professional engines get rebuilt every race) but for a 6cyl to last thru YEARS of street driving, I wouldn't ask it to produce more than 300hp. The L28 can reliably produce 230-280hp all day long for years. 500hp would cost more than I could afford, tax the engine beyond reason, drink enough fuel and generate enough heat (and noise) to make it unrealistic for me.

Further, in order to make 500hp from an L28/3.1L straight six, you have to use some pretty exotic hardware, including big cams and fussy carbs, which give you an outstanding power output, but within a limited rev band. Why would I want 500hp if it all comes on above 6,000rpm, when I do most of my driving at 25-65mph?

And my opinion of my personal driving ability would prevent me from trying to use 500hp in a Z. And that's not even considering what all that torque might eventually do to that thin little eggshell and 'frame' over time. Brakes are another consideration; more go, more stop, (more money).

I didn't mean it can't be done, I only meant it isn't realistic or reasonable to ask that engine to do all that work for street use, when you can (as you have proven) drop a small block V6 or V8 into it and get all the power you need, over a wide, usable rev band, at a reasonable price and with easy flexibility.

(Sorry Murph! It's still your Thread! )