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What's wrong with the 280's?


Darbji280z

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I've read a lot of post where people prefer the 240's. Is there something I don't know. Is the valve on the 280's different? I would say I hope I didn't buy the wrong one, but I really don't care either way. I'll never sell the car so I'm not worried about what I'd get out of it. What I am worried about is if there are any "problems" with them.

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Nothing wrong with a good 280Z. Many of us here are much older than you are, and remember when the 240Z - the original Z - was introduced. So we tend to prefer the earlier, simpler and lighter 240Zs. That's all.

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IF he was talking about stock 240 vs 280, that somebody was incorrect. Kick him in the shin.

The L24 had around 145HP, and the L28 had about 165.

The 240 is much lighter than the 280s, so maybe it might "feel" like it has more power...

edit OK, if you believe Wikipedia, (I do not) the L24 had 151 HP, and the L28 has 154HP. But those #s are sketchy at best, IMHO.

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I just have to laugh about which one is better. When I bought mine neither the 260 nor 280 was being built yet. They all have their pluses and minuses. I own a 240 because I saw the first one while working in the renovation shop and had to have one. Bought this one from my mother and have had it ever since.

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edit OK, if you believe Wikipedia, (I do not) the L24 had 151 HP, and the L28 has 154HP. But those #s are sketchy at best, IMHO.

Well, if you find an error on Wikipedia then you should certainly fix it. 151 is the value given in my factory service manual for '72. The L26 is listed at 165 in my Haynes manual and I'm sure the L28 was at least that high.

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Well, someone told me 170 on the L28. But that's wasn't a very reliable source. Like I said in a different thread, it's faster than my DeLorean and the DeLorean has 175hp. But it also weighs a million pounds. So I'm not too sure how to compare the two.

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I think that "Someone" may have been refering to the first Fuel injected 280Z's. The horsepower lacked until they (Nissan) cleaned up the system then they finally got the HP rating where they should be.

Welcome to the Best Damn Zcar club you'll ever click on. Information is abound and endless, it just takes time, sometimes.

Dave.

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I am not going to get my panties in a bunch over 10 HP. Please also keep in mind that through the 70s, more and more regulations limiting emissions also choked power out of these motors. I have read that the early 260 made more power than the 280 because of this.

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I'd say, with the age of the vehicle, if it is bone stock, you would be safe with 150-170 range.

Another thing to consider, the SAE rating of HP has changed, as well. The higher numbers you see advertized are most likely at the flywheel. I believe some discussions have been had recently on this matter on this forum.

I just noticed you changed your sig. Looks nice. (but, um, is that a porta-potty at the end of the drive, near the pole?)

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If everything is up to spec, you're probably at or around 165+ HP.

Don't worry though, the nice thing about the L28's and almost ALL L-Series motors is the fact that HP can be brought up all over the place. For example.....

I drive a 1970 (8/70) 240z.

Stock block

73' 240Z E-88 head

stage 2 cam (480 lift/280 Duration)

Mallory Unilite (infrared LED) Distributor

MSD 6A electronic ignition

Mallory Promaster coil (65,000 volts

NGK Spark Plugs and Wires

MSA Ceramic coated 6-into-1 Header

2 1/2" exhaust pipe

Raptor Turbo Muffler

My Motor originally had 150 HP at the flywheel. Now, without changing the block (Boring it out) and only putting in a bigger cam, and some external things, it puts out over 180 at the Flywheel.

Hope that helps a little,

Dave.

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So then where do you think the 76 is at? because i am ten kinds of confused.

On the drivers side, under the hood, between the windshield washer bottle, and the strut tower, there should be a metal tag that states your cars engine capacity, hp/rpm, wheelbase, engine type and chassis number from top to bottom.

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At least you didn't buy a 280ZX :P

Thanks for the kick in the shin, Mr Camouflage-good thing I can't see ya! (grumble, grumble, grumble...) :stupid:

But if you are talking about power, you are correct-my beloved zx is indeed saddled down more than the earlier models by various emission controls (grumble, grumble, grumble...)

But to get to your original question-there's nothing wrong with the 280's IMO. For that matter, I don't see anything wrong with any of them; they all have their strong points and weaknesses.

The important thing is that you found a Z car, and that you are enjoying yourself.

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Where Stephen stated, my 7/76 says 170...She has plenty of pep for this 'ole man...I adore my 280, even though I've been having some charging problems as of late. I plan on keeping her till I can no longer drive...LOL

Chris

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I just noticed you changed your sig. Looks nice. (but, um, is that a porta-potty at the end of the drive, near the pole?)

LOL, no it's not a porta-potty.

Thank for the info. I'll look at that tag in the morning. Let you know.

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(but, um, is that a porta-potty at the end of the drive, near the pole?)

Holy crap man! Pardon the pun. Get your mind out of the toilet, whoops sorry again. LOL

Seriously though, by the time the 1973 240Z came around, the real HP in SAE was more like 129hp due to the change in heads, manifolds, and the flat tops. The bore and stroke done to the L6 in the 260 brought it bak up to 139hp and the L28 in the 280 up to 149. Of course the 280 was a lot heavier that the original 240.

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What I thought was this

240z = 151hp

260z = 165hp (weight increases from here on out)

280z = 149hp (emission regulations kicked in)

280zx = 135hp then upped back up to 145hp after a year or so

And the 240z having nearly the same 0 to 60 and weight to hp ratio when up against the 280zx Turbo.

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There ain't nothing wrong with the 280Z. Personally I kinda like the interior better on the 280 than the 240, but thats just me. I love all S30's. The 280 was the only one I could find around here though, and luckily I've been able to locate some parts cars in junkyards, but I am yet to see a 240. Some argue about HP numbers, but there really isn't any way to tell aside from dropping each on a dyno or just racing at the drag strip. Your average Joe is gonna think your 280 is just as cool as a 240. Its got the Z look. I'd like to see some pics of you DMC-12 sometime too!

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I had a 1976 280Z, rated at 149. My buddy had a 1977 280Z, it was rated at 170 - whether there was some change to the ratings (doubtful, sinve typically ratings changes downgrade HP), so something must have changed. Pretty sure my Haynes manual documents this - I'll double check.

Honestly, I thought my 1976 280Z was quicker than my current 1972 240Z. It's possible my perspective of "quick" has changed in 20 years, my daily driver is a Lexus GS400, which will paste quite a few cars.

I did take my '76 to Englishtown Raceway Park to drag, and I pulled a few 15.7 quarter mile times, about in line with what an earlier 240Z will do.

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What I thought was this

240z = 151hp

260z = 165hp (weight increases from here on out)

280z = 149hp (emission regulations kicked in)

280zx = 135hp then upped back up to 145hp after a year or so

It's really not accurate to lump all the 240Z together because there was a number of changes just ot the 240Z that affected overall engine output. Don't for get that the 1970 came with the E31 head and 9.13:1 compression through 8/71 and that is where the 151hp number comes from. The E88 head was introduced in 9/71 which lowered the compression to 8.76:1. At some point Datsun also added the smog pump and other emission related devices which of course affected overall engine output as a result. The power robbing additions continued in 1972 and 1973 with the final insult being that of the hideous flat top hitachi carbs on the 1973 240Z. So, saying that all 240Z's have 151hp simply isn't accurate, even if you swap out the flat tops on the 73, you still have the lower compression E88 head, and the small valve version at that.

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Taking a quick look though an extensive collection of Engine Data Tags (hundreds of them in the collection from Mr. Lowell Wade)

The L24 was rated at 151/150

The L26 was rated at 162 HP

The L28E in the 280Z Federal Models was rated at 170HP

The L28E in the 280ZX was rated at 132HP

The L28ET in the 280ZX Turbo was rated at 180HP (as I recall - I don't have an engine data plate for the 280ZX Turbo's that shows the factory rated HP)

If you have an engine data plate for an L28 in a 280Z - that shows something other than 170HP, it most likely is from the "California" model. In which case you should have a "CAT HOT" warning light in the center console. If you have a picture of that data plate, I'd like to see it.

The bottom line is - that until the 82 280ZX Turbo with the 5spd. came out - none of the North American 260Z's, 280Z's nor 280ZX's were as fast in the 1/4 mile, nor would any of them beat the 240-Z on a road course.

FWIW,

Carl B.

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