Is a 70 distributor Compatible with 73? (was "Good Morning")

[tcav]

I would like to re-build the distributor on my 73 GT. There is a used dist.on e-bay right now out of a 70 GT.I would like to get it and have it sent out to have the re-build done.
Question is, Is a 70 dist compatible with my 73?
thank you
tom

[2 Fast 4 U]

Yes it is

[Lindsay]

www.rockauto.com lists remanufactured Opel distributor for $71.00 (cardone 31957). It might be easier to buy distributor already rebuilt.

[Lindsay]

Earlier Opel distributors had more total advance.
70 GT was the higher compression engine, compared to the later 71 and on lower compression.

Listing of US-spec distributor advance limits for 1.9 litre engines. One item worth noting is that automatic-equipped versions of these model year Opels had different advance rates (the advance occurred sooner), which was accomplished by using lighter tension springs on the mechanical advance. This was to help improve acceleration. Part numbers for the distributors for automatic-equipped cars were different than the same-year manual-equipped cars, but they were otherwise identical in operation. Except for 1975 Opels, all US-spec 1.9's had the static (idle) timing set to 0 degrees BTDC (before top dead center). Note that the engines had less and less total timing as the years progressed, in the interest of reducing exhaust emissions. Opel engines make the most power with a total timing figure of between 34-36 degrees.

1968 - 32-36.5 mechanical advance
19.5-22.5 vacuum advance
51.5-59 degrees total

1969 - 32-36 mechanical advance
11.5-14.5 vacuum
43.5-50.5 degrees total

1970 - 32-36 mechanical advance
11.5-14.5 vacuum
43.5-50.5 degrees total

1971 - 28-32 mechanical advance
7-10 vacuum
35-42 degrees total

1972 - 28-32 mechanical advance
7-10 vacuum
35-42 degrees total

1973 - 28-32 mechanical advance
1-5 vacuum
29-37 degrees total

1974 - 28-32 mechanical advance
1-3 vacuum
29-35 degrees total

1975 - 25 mechanical advance
5 degrees static timing
No vacuum advance unit
30 degrees total

[tcav]

Thank you. contacted rockauto and they will only do return and reman. So going to send them this one and let them do it.
Should I just have them do it to the 1973 specs.or while Im haveing this done is their any kind of upgrade or modification I should have them do at this time?Right now I am running a petrinix but within the next couple of months will be going to a compufire.
thanks
tom kaye

[wrench459]

Originally Posted by tcav Thank you. contacted rockauto and they will only do return and reman. So going to send them this one and let them do it.

My guess would be there just going to replace the housing bushings and call it a reman. Ok it will be clean lets hope.
What about the turn around time?

[hrcollinsjr]

Originally Posted by Lindsay Earlier Opel distributors had more total advance. 70 GT was the higher compression engine, compared to the later 71 and on lower compression.

Different distributors were used different years. There were even some differences depending on whether it was a manual or automatic transmission car. The specs with distributor # are posted in the tech section.

Harold