Tune-Up Specifications (69-70 GT)

[EJprovost]

Can anyone tell me if the tune up specs are the same for a (71-73 Opel GT), as they are listed here for the (69-70 Opel GT)? Any remarks on lining up the timing light too would be greatly appreciated.

TUNE-UP SPECIFICATIONS 69-70 Opel GT

ENGINE:_________________1.1 SR Liter ______________1.9 S Liter

Belt tension.........................? ...................................?
Spark plugs
normal driving................... AC 43 FS........................ AC 42 FS
city driving...................... AC 43 FS........................ AC 43 FS
highway driving................ AC 42 FS........................ AC 42 FS
Spark plug gap................ (.030)............................. (.030)
Dwell.............................. 50+/- 3*(degrees)........... 50+/- 3*(degrees)
Point gap........................( .018)............................ (.018)
Iginition timing at 700 RPM (vacuum units disconnected and hoses plugged).....Align timing marks Idle speed
manuel transmission............ 950-1000........................ 700-750
automatic transmission..... __ ................................... 550-600
Thermostat opens at.......... 190*(degrees)................. 190*(degrees)
Radiator filter cap pressure.. 10psi ............................. 13psi

ENGINE SPECIFICATIONS and DATA _________ 1.1_______________ 1.9
Bore and stroke............................... 2.95 in. X 2.40............ 3.66 in. x 2.75
Compression ratio............................. 9.2........................... 9.0
Cubic inch displacement.................... 65.8......................... 115.8
Horsepower (brake).......................... 67 SAE at 6000 RPM.... 102 SAE at 5200 RPM
Firing order..................................... 1-3-4-2.................... 1-3-4-2

[GTJIM]

All the tuning info there is much the same as for a 71-73 1.9L motor too.
Though the later motors will take a wee bit more ignition advance than the factory setting - maybe the width of the timing mark on the front cover.
Any sounds like big hammers hitting the top of the pistons and retard it a bit - if the exhaust manifold glows red-hot after a long run then ignition needs a bit more advance. Best to find someone with a timing light which flashes each time cylinder #1 fires and shines a stroboscopic light down on to the timing marks. Makes the front pulley look like it is not rotating and shows up the timing marks - great to watch!

HTH

[EJprovost]

Originally Posted by GTJIM All the tuning info there is much the same as for a 71-73 1.9L motor too. Though the later motors will take a wee bit more ignition advance than the factory setting - maybe the width of the timing mark on the front cover. Any sounds like big hammers hitting the top of the pistons and retard it a bit - if the exhaust manifold glows red-hot after a long run then ignition needs a bit more advance. Best to find someone with a timing light which flashes each time cylinder #1 fires and shines a stroboscopic light down on to the timing marks. Makes the front pulley look like it is not rotating and shows up the timing marks - great to watch! HTH

Any adjustments need to made for the high compression engines?

[hrcollinsjr]

Originally Posted by EJprovost TUNE-UP SPECIFICATIONS 69-70 Opel GT ENGINE:_________________1.1 SR Liter ______________1.9 S Liter manuel transmission............ 950-1000........................ 700-750 automatic transmission..... __ ................................... 550-600

1.9 specs look a wee bit low. I believe if you check you'll find M/T 850-900 and A/T at 750-800. I'm not sure of the A/T speed.

Harold

[2 Fast 4 U]

Originally Posted by hrcollinsjr 1.9 specs look a wee bit low. I believe if you check you'll find M/T 850-900 and A/T at 750-800. I'm not sure of the A/T speed. Harold

A/T specs 750 - 800 but I find them what low myself , for me 950 - 1000 RPM in the P or N [= about 750 - 800 in D] works the best