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  #16  
Old 12-09-2017, 03:05 PM
pmac pmac is offline
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Quote:
Originally Posted by toopy View Post
Yes please Pete, that would be fantastic
Err... not quite fantastic but it now lines up properly with the mounting holes.
Email me to arrange.pmaczc@madasafish.com
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  #17  
Old 14-09-2017, 12:55 PM
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Rob Gaskin Rob Gaskin is offline
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Originally Posted by johnymd View Post
Has anyone come up with a definitive distance that the bolt hole should be offset? I think the last time this was asked, no-one in the know came up with a figure.
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I have seen a cross member that is already offset. Anyone know what this is from?
Looking at Pete's latest unmodified crossmember it's different to mine so am I right in say that the crossmembers for the 4 and 5 speed gearboxes are different? If so that might be why there is confusion John?
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Last edited by Rob Gaskin; 14-09-2017 at 01:44 PM..
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  #18  
Old 14-09-2017, 01:59 PM
SKiddell SKiddell is offline
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There is certainly a difference in the mounting method from early to late cars

Early cars had a vertical bolt on each side holding a cross-member up where as on later cars there were horizontal pins through bushes (one per side) holding the cross-member in between shackles
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  #19  
Old 14-09-2017, 02:05 PM
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Originally Posted by SKiddell View Post
There is certainly a difference in the mounting method from early to late cars

Early cars had a vertical bolt on each side holding a cross-member up where as on later cars there were horizontal pins through bushes (one per side) holding the cross-member in between shackles
It's not that Steve it looks like Pete's crossmember has a curve (fore and aft) mine was straight across. It might be an optical illusion.
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  #20  
Old 14-09-2017, 07:46 PM
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johnymd johnymd is offline
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I believe the mounting positions for both 4 and 5 speed are the same as I've just swapped from a 4 to a 5 and used the same gearbox mount and cross member. As Steve said, the early cars had the vertical mount and all others had the horizontally bolt mounting. The 280zx hard a curved cross member which may then require less of an offset adjustment for the hole. It will still need cutting though so it doesn't really matter which you cut up. I've come to the conclusion that around 35mm is the approximate amount of adjustment required. The reason it is not critical is due to the clearances for the various bolt holes and the rubber mountings of both engine and gearbox. This is why some people can get away with 25mm offset and others nearly 50mm. you can make either fit. As your modifying the cross member and shortening the prop, you could also take the opportunity to relocate your engine further back (as was done successfully with big sam) and improve the handling.
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'73 240z 1JZ-GTE. Was pretty quick. 11.10@132.5mph
'72 240z RHD (4BOA) Being painted Orange. Bodyshop.
'72 240z LHD Black. Sold.
'73 240z LHD Green. Sold.
'73 240z LHD White. Sold - Future race car.
'73 240z LHD Blue. Sold.
'73 260z LHD Orange. Sold to a good home.
'70 240z LHD Yellow. On route and cant wait.
Skyline R33 GTS - Gone
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Go to: www.240z.me.uk to checkout the cars.
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  #21  
Old 14-09-2017, 07:52 PM
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toopy toopy is online now
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As far as the prop is concerned, does everyone just shorten it by 2 inches, as I've seen that amount quoted a few times?
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  #22  
Old 14-09-2017, 08:04 PM
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toopy toopy is online now
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So if Im understanding this right, this is late 240, early 260 cross member 240260.jpg

and this is the more curvy 280zx cross member 280zx.JPG

so the gearbox rubber mount it is different as well?
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  #23  
Old 14-09-2017, 08:07 PM
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Modified engine mounts for anyone interested.
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Drives:

'73 240z 1JZ-GTE. Was pretty quick. 11.10@132.5mph
'72 240z RHD (4BOA) Being painted Orange. Bodyshop.
'72 240z LHD Black. Sold.
'73 240z LHD Green. Sold.
'73 240z LHD White. Sold - Future race car.
'73 240z LHD Blue. Sold.
'73 260z LHD Orange. Sold to a good home.
'70 240z LHD Yellow. On route and cant wait.
Skyline R33 GTS - Gone
Skyline R34 GTR - Gone
Toyota Surf 3.0TD

Go to: www.240z.me.uk to checkout the cars.
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  #24  
Old 15-09-2017, 07:26 AM
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jonbills jonbills is offline
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I'm surprised you can move the engine that far back, have you also got a pic of the rear of the engine and firewall?
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  #25  
Old 15-09-2017, 07:50 AM
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Rob Gaskin Rob Gaskin is offline
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Quote:
Originally Posted by johnymd View Post
Modified engine mounts for anyone interested.
That's an interesting picture - oil pressure switch, modified sump with temp sensor I'm assuming (or pipe for something), oil cooler and yes that quite a big 'move'.
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  #26  
Old 15-09-2017, 08:54 AM
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johnymd johnymd is offline
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I got the option to spend an afternoon at JD Classic to look all over Big Sam for Ideas. I took lots of pictures of all the interesting areas on the car. This mod was top of my list and from what I understand, was a major contributor in making the car handle so much better than a standard zed.

I'll dig out some more pictures if anyone's interested.
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Drives:

'73 240z 1JZ-GTE. Was pretty quick. 11.10@132.5mph
'72 240z RHD (4BOA) Being painted Orange. Bodyshop.
'72 240z LHD Black. Sold.
'73 240z LHD Green. Sold.
'73 240z LHD White. Sold - Future race car.
'73 240z LHD Blue. Sold.
'73 260z LHD Orange. Sold to a good home.
'70 240z LHD Yellow. On route and cant wait.
Skyline R33 GTS - Gone
Skyline R34 GTR - Gone
Toyota Surf 3.0TD

Go to: www.240z.me.uk to checkout the cars.
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  #27  
Old 15-09-2017, 10:04 AM
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Rob Gaskin Rob Gaskin is offline
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Going back to the gearbox crossmember mod in order to establish how far the gearbox mount had to be moved I just measured the old and new boxes. Same with the propshaft i.e. where does the shaft sit in relation to the old 'gbox. You only have to put the two boxes side by side.
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  #28  
Old 15-09-2017, 11:44 AM
SKiddell SKiddell is offline
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Moving the engine back isn't always a mechanism for better handling, take for instance front wheel drive cars such as Focus ST's, Honda Civic type R, and just about any of the high end hot hatches, the majority of which handle fantastically despite having an engine sitting directly above the front axles.

Moving the engine back "can" reduce mechanical grip by reducing load on the front tyre
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