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Posted by: Jameel Jul 7 2017, 07:17 AM

I've got my engine on a stand and I'd like to try and figure out how much displacement I've got. I just replaced all my pushrod tube seals and did a valve adjustment, so I don't want to remove the heads. The engine came out of a '71 and was running 40IDF's when I bought it. The car makes a lot more power than a stock '71 injected engine, so I'm curiousif it's been fitted with larger cylinders. Might just be the carbs I'm feeling...

One idea I've got is to set a piston at BDC on the intake stroke and then CC the chamber through the spark plug hole, carefully stopping the liquid when I reach the bottom of the plug hole, then measure the amount.

Problem is, the intake valve will still be slightly open at BDC, since most cams have at least one valve open at BDC.

Got any ideas?

Posted by: barefoot Jul 7 2017, 07:28 AM

If an intake is slightly open (which you can see inside the rocker cover), relieve the load on the intake rocker arm till it's slack

Posted by: Mark Henry Jul 7 2017, 08:39 AM

Take the rocker off, on the stand tilt it so the plug hole is level, at TDC fill the chamber and that's your chamber CC.
Then at BDC fill with (oil - chamber CC) X 4 = engine CC.

Posted by: TheWeatherMan Jul 7 2017, 08:51 AM

what if the engine is in the car.....?

Posted by: The Cabinetmaker Jul 7 2017, 12:03 PM

Turn the car on its side?

Posted by: Mike Bellis Jul 7 2017, 02:54 PM

Pour beer in the cylinder and see how much it holds... Multiply by 4...

Posted by: Rand Jul 7 2017, 03:03 PM

The beer theory is much more accurate than the carb theory.

Posted by: Mike Bellis Jul 7 2017, 03:54 PM

Why waste good oil like Mark Henry when you can use shitty beer?

Posted by: Porschef Jul 7 2017, 03:56 PM

Beer has carbs, especially IPA's.

Posted by: Jameel Jul 7 2017, 05:03 PM

Thanks everybody. I'll fill the jug with brew and get right back to you.

Posted by: Mark Henry Jul 8 2017, 07:58 AM

If it's on a stand with the tin off it's easier to just remove a head.