240z with 280zx non-turbo exhaust question.
Posted 14 September 2015 - 08:19 AM
Posted 14 September 2015 - 02:01 PM
Actually headers will probably be easier to service (it's much lighter and you can easily see all the bolts on it). As for the stock manifold, I believe it will depend on if you have the EGR port or not, but every 2 port "midpipe" will bolt to any other header. They don't change much is design.
We race from 120MPH rolls...
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Posted 14 September 2015 - 04:05 PM
The ZX downpipe will likely need a bit of modification to work. We have a 280Z engine with the cast iron manifold and downpipe (from a 75 280Z) in our 73 240Z. To make the downpipe fit we had to heat and bend it a bit. If I recall correctly, we did this in the car with the car on a service rack at the muffler shop. Not a big deal if you don't get fussy and worry about flow rates and such. Just be sure not to collapse the bend.
Also, there are at least two variants for the connection between the cast iron manifold and the downpipe. The early type has a different bolt pattern and I think the two pipes are slightly smaller as well.
Posted 15 September 2015 - 08:14 AM
Posted 15 September 2015 - 09:15 AM
Edited by Montana13, 15 September 2015 - 09:16 AM.
Posted 15 September 2015 - 04:02 PM
How far down the down pipe did you cut it off?
Posted 27 September 2015 - 07:32 AM
Thanks to all for the reply. I figured I should let those interested what I finally came up with.
I bought on eBay a 240Z head pipe(part number 20010-e4100 which is superseded by 20010-n3000).
Then I bought both a gasket for the 280Zx and the 240Z. Using the 280ZX gasket I was able to mark the flange
as to where the bolts had to be. The ZX's are larger and in different locations. I filled the 240Z
holes with three pieces of a bolt that just fit the holes then welded them in and smoothed both surfaces of the flange.
then, using a few drill bits and a rat tailed file I notched the flange.
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I had a little trouble installing, as one of the pipes that went up into the manifold was out of round and would not allow me to
tighten the bolts. After fixing that it fit right in.
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I like the length of the two runners on the 240Z pipe over the shorter ones on the 280ZX.
I hope this helps any one trying the same swap.
Edited by Duff, 27 September 2015 - 07:35 AM.
Posted 02 October 2015 - 10:02 PM
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