Jump to content

IGNORED

What Year Engine?


chiefmd

Recommended Posts

I just recently purchased a 1978 280Z that is fairly good order. But as usual for older cars it needs to have some work done. It is running rich so I have downloaded the FSM and started performing some checks and I need Thermotime sw and Water Temp sensor. But after looking at the manuals I'm not sure if it is a 1978 engine. The manufactures plate reads that it build 2/78 so I know the car/chassis is a 1978. But I'm not certain if it is the a 1978 engine. Is there anyway I can tell if in fact it is a 78 or 77 or even a 76 engine?

Link to comment
Share on other sites


A 78, 77, or 76 engine would be pretty much the same. Some of the components changed like the Air Flow meter, the fuel rail, etc. but as long as you have the correct componenets for a 78 connected to the engine it will work as it should. Differences on the 78s from the earlier years include an internally regulated alternator, no fuel pump contacts in the AFM along with different circuitry to actuate the fuel pump,

Link to comment
Share on other sites

Of all of the 280's entered by people in my online spreadsheet that's the biggest number so at first glance is most likely not from an earlier car. Did you check the engine compartment plate to see if the engine is original? In other words the engine number on the block matches the engine number on the plate and the VIN on the plate matches the VIN on the dash and on the door jamb plate and on the firewall?

Link to comment
Share on other sites

There's no engine number on the plate on a 78. My 5/78 buld date 280Z has L28 275875. The engines weren't sequentially installed but I guess that your engine might be from a ZX. What's the head type? (Letter and two numbers at the base of the head between cylinder one and two) and block type? (letter and two numbers on drivers side of block just behind the motor mount)

Edited by sblake01
Link to comment
Share on other sites

Of all of the 280's entered by people in my online spreadsheet that's the biggest number so at first glance is most likely not from an earlier car. Did you check the engine compartment plate to see if the engine is original? In other words the engine number on the block matches the engine number on the plate and the VIN on the plate matches the VIN on the dash and on the door jamb plate and on the firewall?
Late 280Zs did not have the engine number on the engine compartment plate, so there's no way to check there. I think they stopped putting it on the plate after '76.
Link to comment
Share on other sites

Late 280Zs did not have the engine number on the engine compartment plate, so there's no way to check there. I think they stopped putting it on the plate after '76.

Sorry, I didn't know that. I wonder why they stopped that practice?

Link to comment
Share on other sites

Thanks for the info. The number on the block is L28 353159
Of all of the 280's entered by people in my online spreadsheet that's the biggest number so at first glance is most likely not from an earlier car.
But it is also a bit lower than the earliest 280X listed there, so I think it's quite possible that it could be correct for a '78.
Link to comment
Share on other sites

That poses a dilemma. I assume that everything associated outside of the engine is 78 280Z ie AFM, FI, etc. Timing should be setup for a 81-83ZX? The distributor is not from a ZX. What else should I be concerned with as far as setting up the engine to run correctly. Or am I being overly concerned. Thanks

Link to comment
Share on other sites

That's definately a P79 judging by the hole for the cylinder head temp sensor which you won't use on a 78 so you need to plug that. Other than that, use the 78 specs as far as tune up and the components that match the 78s electronics and fuel system and you shouldn't have any problems.

Link to comment
Share on other sites

Blake - The head number is P79 and block is N42. Thanks again for all the input.

The P-79 head is not from a turbo engine first off. I have the same head. P-79 is from a normally aspirated engine. The head has diamond shaped exhaust ports. The turbo head have square ports and are P-90 or P-90A heads. The block could vary well be a '78 or '79. Both have dished pistons. '81 - '83ZX blocks have flat topped pistons and are marked F-54. L-28 blocks all have dished pistons unless modified. The P-79 head is a 8.3 to 1 , or there abouts, on a F-54 block where it came from. On a dish piston block , unless it has been milled it would be a low compression combination.

Edited by beandip
Link to comment
Share on other sites

That's what I said (kind of). What I meant to say in post 13 is that would be an 81-83 ZX non turbo head rather than engine but I did say non turbo. The block could be anywhere from 75-80 since it's a N42 but with the high number it's likely 78-79 like you said

Edited by sblake01
Link to comment
Share on other sites

The block could vary well be a '78 or '79. Both have dished pistons. '81 - '83ZX blocks have flat topped pistons and are marked F-54. L-28 blocks all have dished pistons unless modified.

??????????????

N42 blocks all have dished pistons unless modified - -

FWIW,

Carl B.

Link to comment
Share on other sites

When I had the E1 engine in my 320 pickup I actually did start it a few times with the hand crank. I still have the crank but with the J16 engine and it's higher compression and the fact that there's not a keyway on the front of the pulley, I can't do that anymore

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Who's Online   0 Members, 0 Anonymous, 49 Guests (See full list)

    • There are no registered users currently online
×
×
  • Create New...

Important Information

By using this site, you agree to our Privacy Policy and Guidelines. We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.