[tunepipe911]

another gt guestion
is there a difference in compression between egines
for american typed gt's and european
the engine is 1,9s from a 1971 gt
thanks

 

[RITTER]

Someone correct me if I am wrong but wasn't '71 the year opel dropped compression on their 1.9? So it could be possible a few '70's style engines still were filling some of the GT's. I wouldn't think that there was a difference from region to region on Compression in '71 though.

 

[greensmurf20]

yep 71 was the year for the compression drops. 9.0 down to 7.6, dont seem like they would change the engines for german and american GTs. i wasnt sure so thats why i didnt post until now to verify the year for compression ratio drops.

 

[tunepipe911]

engine pressure

thanks
I am glad the engine seems fine after all,I had the engine tested
and had a compression from 7.1 up to 7.4
i think that is normal for an original engine with aprox 135.000miles on the board

 

[greensmurf20]

ya that dont sound half bad at all for a high milage classic! glad to hear you made out good on the motor and good luck with your car!!!

 

[Travis]

Re: engine pressure

I had the engine tested
and had a compression from 7.1 up to 7.4

There was a thread a week or so ago which discussed why the static compression ratio could not be tested/calculated externally. Did they give you compression numbers? If yes, you should compare them to what other people have measured on engines identical to yours. Did they do a leak down test? This is also a good indication of the engines condition.

-Travis

 

[tunepipe911]

engine pressure

engine had a complete test and seems fine,another problem was
oilpressure
I opened the oilpomp and had it replaced because the inner valve did not close verry well
on the inside is a spring witch makes the valve close properly
all of that was damaged by a little bit of material wich came off
the distributionchainshoes(piece to keep pressure on the chain)
the material gets hard trough time(30 years is old)
maybe check out for other members while engines are opened,
at suselbeek netherlands there are replacements sold
I also found a dealer in used car-parts who has lots of original
opel parts availble,such as enginesgaskets ,oil seals and some
litle parts,
when possible I will send some pics of the car,for the moment I am not that good in computers
ps:sorry for any bad translations in englisch,I am learning all the time

 

[kwilford]

I was under the impression that the Euro GT's were all high compression ratio engines. I recall reading that Opel occasionally ran out of the U.S. specification engines (after 1971), and a Euro engine would find it's way here as a factory "crate" engine. I'll post on the Classicopels site (which has a few very knowledgeable regulars from Europe) to see which is true.

 

[tunepipe911]

engine pressure

I was also thinking that there was a difference between
european and american engines,was it not because off
the higher rules involving nature and inviroment regulations
that is why the amereican gt's had the cannister in the front
and european did not
to drive on the fuel in america they had to lower the compression???octaan 95%% or 98%%
here in europe that is a problem, exept when you have a original american engine because off the lower compression, I am not sure that what i am whrighting is true,
that is why I posted this thread,

 

[kwilford]

Norbert Michailowitsch, one of the regulars on the classicopels board, provided this information:


Due to the intensified exhaust regulations starting from chassis
number 2265862 changed engine parts were used.
Opel changed the cam shaft, the cylinder head with hydraulic valve
adjustment, the valves and the (low compression) pistons.

The result of these modifications is a power loss, to a lower
compression of 7,6:1 (78 HP - 4800/min).

The engines were characterized as 19SUS and could be operated with 91
ROZ No-Lead/Low-Lead.

Starting from the chassis number 2560567 the vehicles were equipped
with the O.E.C.S (Opel Emission Control System).

Starting from the chassis number OY07NC2944586 the power of the
engines is indicated as 75 HP at 4800/min.

In Germany we remained exempted from these restrictions of
power...


Norbert
http://www.opelgtworld.de

 

[wrench459 (R.I.P.)]

Norbert Michailowitsch, one of the regulars on the classicopels board, provided this information:


Due to the intensified exhaust regulations starting from chassis
number 2265862 changed engine parts were used.
Opel changed the cam shaft, the cylinder head with hydraulic valve
adjustment, the valves and the (low compression) pistons.

The result of these modifications is a power loss, to a lower
compression of 7,6:1 (78 HP - 4800/min).

The engines were characterized as 19SUS and could be operated with 91
ROZ No-Lead/Low-Lead.

Starting from the chassis number 2560567 the vehicles were equipped
with the O.E.C.S (Opel Emission Control System).

Starting from the chassis number OY07NC2944586 the power of the
engines is indicated as 75 HP at 4800/min.

In Germany we remained exempted from these restrictions of
power...


Norbert
Opel GT World

So if I'm correct.
Opel lowered the "static" and the "dynamic" compression ratio to met US emissions
standards of the day?