A&Q about 350Z
Q:
well i just put my '72 back together with a stock l24 that had been sitting in a garage for 15 years (the turbo engine did not look happy when i tore it apart) any hoo, all i have is full exhaust and an n36 intake..
and i was driving tonight and saw a '90 z32 5sp coupe na.. and i threw a rev, and he reved back, so i squared up with him at around 40 mph, threw it in 2nd, and woofed it, as soon as he hit it,i nailed it.. and from 40-90 roll, i put 2 car lenths on it.. me granny shifting (not trying to tear my 34 year old 4sp up..) and he was giving that poor car hell not letting off the gas in between shifts etc..
but i honestly thought i would get my ass handed to me.. the l24's are deceptivly quick... feels like a totally different animal than my '73 with a l28 n42/n47.. (makes it's power up high unlike the l28..) but all in all iam happy, i am guessing i would run a low 15 high 14... he was shocked to say the least... heh 2.4 151 hp vs 3.0 225
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orange '72 240z
blue '72 240z
red (in places) '73 fairlady z 2+2
red '98 SWB chevrolet c1500 5.7
A:
yep, the L24 has a power delivery totally different than the L28.
People Are Idiots, Just look around here and you will see!
Tony D: "Knowledgeable but Caustic"... rationull
My brother from another mother calls himself "Willie D"
A:
hey tony, call me when you have a chance
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orange '72 240z
blue '72 240z
red (in places) '73 fairlady z 2+2
red '98 SWB chevrolet c1500 5.7
A:
weight makes up a huge difference as well...
A:
yeah no ****.. for every 100= a tenth in the 1/4
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orange '72 240z
blue '72 240z
red (in places) '73 fairlady z 2+2
red '98 SWB chevrolet c1500 5.7
A:
i wish i never swapped my l24 for an l28 i swear to this day the l24 is this ****
if your going all out mod sure go with l28 or 3l+ but stock for stock or just mildly modded i would take an l24 over an l28 anyday
probably has alot to do with comp ratio - im sure once i slap that mn47 on the l28 it will be allright but i just love the higher revs of the l24 ill never forget swinging the 70 with the 300,000 mile stock w/ exhaust l24 at 7.5 - 8 k
70 yay!
77 parts
81 compressed parts
86 compressed it handles
00 mercury cougar omg wtf : \ girl has to have something to drive
- owned
74.5 why did i sell you
81 1st car $425 found out s130s dont handle stock
82 good
84 BMW 325e omg never again
Post Edited (Jul 9, 10:58pm)
A:
and a non turbo z32 is NOT fast by any means.. but it was cool to keep up in a stock 240
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orange '72 240z
blue '72 240z
red (in places) '73 fairlady z 2+2
red '98 SWB chevrolet c1500 5.7
A:
you guys just answered any questions i had on the l24 and l28 differences.i was going to post in the tech section.basicaly what are the differences stock for stock.or can a properly set up l24 hold it'own against an l28.i had a chance to drive both and theres not a whole lot difference.you can realy gets some nice power out of the l24.
Z's are like woman maintenance,maintenance,maintenance!
1971 240Z gunmetal metalic 5sp 4:11 gears in the rear
illuminas and purchased from the original owner w/136k original miles
A:
compression differences are drastic ... 9.13:1 in a l24 go to some flat tops w/ a n42 head... 9.8:1 oh yea
A:
well the car i have now (240) belonged to a friend and one of the engine set up's was a f54 flat top/n47.. and i will tell you, a properly set up l28 will walk the fking dog on an l24..
i would go so far as to say, just by putting in a f54 flat top lower end in, with a max n47, with the 240 carbs and the exhaust, i would say i could EASILY go a full second faster in the 1/4
now a dished piston l28 is not much more powerful than a l24, unless you bolt on a e31 or mn47...
but if you are modding your 240, i would say an l28 is the best bang for your buck
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orange '72 240z
blue '72 240z
red (in places) '73 fairlady z 2+2
red '98 SWB chevrolet c1500 5.7
A:
I know people who reduce the displacement of an L28 by destroking it with an L24 crank. It ends up being a 2.6 litre with the same bore/stroke as an RB26DETT. They end up getting less power than an L28 but they have more fun driving the car.
1971 240Z
"Fear is exciting for me." -Ayrton Senna
A:
l28 w/ a l24 crank god damn.. that would be a 6.47:1 cr... talk about crappy NA... even w/ flat top pistons it'd be 7.35:1 (thats all w/ the n42 head)
l28 w/ a l24 crank displacement is 2569 cc's
A:
You need to select the L24 conrods which should have been a given.
1971 240Z
"Fear is exciting for me." -Ayrton Senna
A:
I've run both identically prepped setups on my Z except the dished L28 had 9.6:1 CR and the the L24 had 10.7:1 CR.
The L24 was worn out and burned a quart of oil in 300 miles, so I imagine it could have been faster with stronger rings.
Anyway the the L24 with N42 head ran a 13.6 @ 99 mph with NO speed shifting.
The dished L28 with the same N42 head ran a 13.4 @ 101 mph BUT was speed shifted!!
Had I lifted off the gas the L28 would have run the same as the L24.
Anyway the L24 pulls like a TRAIN above 6000 rpm but the L28 was obvioulsy much stronger below 5000 rpm.
In daily driving the L28 was better but when racing the L24 was more fun because it would spin the wheels much more at each shift.
An L24 crank with 89 mm pistons should be a blast to drive.
Later,Norm
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12.804 @ 107.26 mph on crappy street tires with Dual SU Powered 2.9L Stroker!
ZCAR.COM member since Aug 1998
Post Edited (Jul 10, 8:13am)
A:
"An L24 crank with 89 mm pistons should be a blast to drive."
Try a destroked L28 with the L20A crank.
Or for that matter, a cammed to the hilt L20A making 195hp at 8750rpms!
You wanna talk about "top end pull"? Short strokes make for revvy engines, fun to drive in a sporty-curvy, twistie environment at high speeds!
Low speeds garner the respect of the pulling power of torque down low.
I prefer high-speed sweepers, personally!
People Are Idiots, Just look around here and you will see!
Tony D: "Knowledgeable but Caustic"... rationull
My brother from another mother calls himself "Willie D"
A:
BATHURST!!!
1971 240Z
"Fear is exciting for me." -Ayrton Senna
A:
Ya, you got to love the the l24 in a stock 240Z. My 240Z had the engine rebuilt to stock spec 10k miles ago and it it peppy as hell. Not much HP (about 150 at the flywheel) but with such a light weight car it doens't need much HP.
On the other side my stock 300zx is heavy and isn't the fastes car around. but, get her movnig and she is so much fun to drive in the higher RPM range. great car for the track.
Now for beating the 300z by 2 cars? kind of hard to believe, but not saying it did not happan, because according to you it did.. I have raced both of mine from a stand still, and from a role. My 300Z wins both times. From the stand still my 240Z gets the jump by about a car length, but once I shift into second in my 300Z it just starts to pull and by the top of second i am about a half car ahead and from third on, it is no competition. From a role of 40mph which a little under 5000rpm in second gear in the 300Z and my 240Z in second at about 4000rom the 300 smokes the 240.
In either case great race and it is always fun to race another Z.
'71 240Z, for the track,
'91 300ZX 2+2, for fun in the sun!
A:
I recently picked up a 73 240Z, all original, great condition, except for a recent paint job and re-upholstered seats. It had carb problems, which I understand is ordinary for the 73, but I was not too concerned because my L28 has already been pulled from my 81 ZX, after extensive head, cam, (fill in the blank) work, etc.... and I'm now dropping the L28, 5-spped tranny and r200 3.9 diff into the 240Z. I basically spent the same amount on the 240Z that I was going to dump into paint and body work of the 280ZX - - so that was my excuse or logic... plus I really love the 240Z.... I'm keeping all of the original L24 engine, tranny, diff parts, since they are original/matching. Now I'm thinking of putting the L24 engine in the 280ZX (kind of backwards, but I don't feel like getting a junkyard/used L28 and it would be kind of cool). The 280ZX is going to my brother (I'm not sure if he has the heart and mind to get it going, but I'll happily assist in rebuilding it)............. and if I ever need the L24 engine, I'll have access to it..... sorry, long build up here, but.... My question is - I saw the 4-brrl manifold for a 390 cfm holly carb at Arizona Z Car.... I'm not too fond of the dual su's.... has anyone done this and what kind of hp/torque characteristics does it produce? I'm just toying with the idea... and I like what I've heard about how the L24 revs and its general characteristics.... either that or I'm going to store the original engine so that I have a maching numbers car in the future..... any other suggestions are welcome.... thanks
A:
Yup, I had a blast with my original L-24 that is now sitting on the stand awaiting another overbore to 84mm. And with that it will include a fully balanced bottom-end, flat tops, mildly ported and matched E-31 along with L-28 valves but I'm undecided on the cam as of yet though as I much like Tony stated above I enjoy revving the belly-piss out of mine through the twistys. I can't wait to get started on this project.
Dave
12/70 240Z, L-28, flat-tops, N-42 head, N-33 intake, MSA 10-2002 cam, ZX ignition, early 5-speed, R-180,4:11 gears, 903 Blue paint.
A:
I'm with you Dave,can't wait to hear mine run.
Does anyone know how to get a hold of 12 second Norm, I was wanting to ask him about his 2.4 but I don't know how to PM him. IF your out there Norm my e-mail is sfinnerty@indy.rr.com if you would entertain some ???
As far as the cam goes Dave the more i read the more I wish I went more radical. I am spending all this money to balance this motor and port and polish and i might be putting in a weeny cam. I guess later down the road I could swap it out.
A:
madkaw, check your email.
Dave
12/70 240Z, L-28, flat-tops, N-42 head, N-33 intake, MSA 10-2002 cam, ZX ignition, early 5-speed, R-180,4:11 gears, 903 Blue paint.