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MH77280Z

77 280z timing problem ***NEED HELP***

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Hi Guys, so i have been working with my mechanic on my 77 280z, it is automatic.

The N47 head was cracked so we found a new rebuilt head and engine giving good compression as well. The CAM was old and had plenty of wear so decided to put a new CAM. New spark plugs off course. Gap set to factory.

The problem coming in setting the timing. My mechanic is very skilled but obviously he has not worked on 280z before. He says everything fires up nicely but we are not able to set the timing. He says the distributor had to be fully advanced to set the timing. But it should not be this way. It has to align with first cylinder/stroke etc. But when you do that timing is a bit off.

There is a new timing kit as well. I told him to open the valve cover and lets make sure original CAM and new CAM is same.

Appreciate some guidance here. We are new to 280z and I am almost there to getting the engine fully operational. Need help with setting the timing ... what do you guys think?

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56 minutes ago, MH77280Z said:

He says everything fires up nicely but we are not able to set the timing. He says the distributor had to be fully advanced to set the timing. But it should not be this way. think?

What is the timing number with the distributor turned to the limit?

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5 hours ago, MH77280Z said:

Is this the firing order for 77 280z? Just confirming with your car!!!

Yes, and the firing order for L series engines as far as I know.

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Posted (edited)
28 minutes ago, grannyknot said:

Yes, and the firing order for L series engines as far as I know.

The number #1 position is set how? Is this the position with distributor fully advance? I think not just asking. 

Edited by MH77280Z

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On 6/11/2020 at 12:58 PM, MH77280Z said:

He says everything fires up nicely but we are not able to set the timing. He says the distributor had to be fully advanced to set the timing.

But it should not be this way. It has to align with first cylinder/stroke etc. But when you do that timing is a bit off.

It's very common for the distributor drive gear to be off one tooth.  If he was able to get to the desired advance number on the damper pulley and timing tab then it doesn't really matter.  That's why I asked what the number was.

It's one of those things that won't hurt anything but isn't "right".

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Hi guys, so when we got a new N47 head we also got a new Cam. Mine is a 77 280z non turbo. But the guy told me the cam we found was for turbo but there is no difference in the cam. Will turbo cam be ok in a non turbo car? Visually it seems exactly the same?

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Visually? or verified with some calipers and degree wheel?

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Good link Site

The short answer is the turbo cam is not going to breath as well in a NA engine. the added pressure makes up for lack of valve lift and other small changes

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Guys thanks for all the responses. A seriously dumb question since I am new to this car. Mine was a N47 head so it is either a L28 or L28e cam based on the table. How do you find out if it is L28 or L28e cam?

As L28 was used just once and L28e/L28et was used in many heads. Appreciate.

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Also what is externally oiled came vs internally oiled? are they different in timing? how can i tell which one my car came with? we have the original one off course.

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Posted (edited)

So guys i just checked the old cam shaft has A1 on it and the one we have put in has A3 on it. Both have no holes on the cams (those are for oil etc. i think in some cams). So seems like we have the right cam based on the table it should be A correct?

Edited by MH77280Z

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They're all very similar, changes were probably for emissions.  If it doesn't have holes in it it's not a turbo cam.  The turbos came out well after Nissan went to internal oiling.  A cam with no holes in the lobes needs a spray bar.

All of the L28's in the states are "E".  Electronic fuel injection.

Your main concern with installing a cam is to get good rocker arms on good cam lobes.  You won't see much difference in performance between the variations but you can wipe out a cam lobe pretty easily.

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Just a correction so I checked both the cams today and the old and the new one installed both have A2 stamped on it so they are same. Both doesnt have holes.

Will report the timing with distributor advance tomorrow.

 

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