 What size engine? Ways to figure out my displacement... |
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| Jameel |
 Jul 7 2017, 07:17 AM
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#1
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Member  Group: Members Posts: 98 Joined: 6-October 15 From: Iowa Member No.: 19,239 Region Association: None  |
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? |
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| barefoot |
Jul 7 2017, 07:28 AM
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#2
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Senior Member Group: Members Posts: 1,370 Joined: 19-March 13 From: Charleston SC Member No.: 15,673 Region Association: South East States 
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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
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| Mark Henry |
Jul 7 2017, 08:39 AM
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#3
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
(IMG:style_emoticons/default/agree.gif) 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. |
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| TheWeatherMan |
Jul 7 2017, 08:51 AM
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#4
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Newbie Group: Members Posts: 18 Joined: 2-July 17 From: Vienna, VA Member No.: 21,222 Region Association: MidAtlantic Region |
what if the engine is in the car.....?
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| TheCabinetmaker |
Jul 7 2017, 12:03 PM
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#5
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I drive my car everyday Group: Members Posts: 8,336 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
Turn the car on its side?
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| Mike Bellis |
Jul 7 2017, 02:54 PM
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#6
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Resident Electrician Group: Members Posts: 8,347 Joined: 22-June 09 From: Midlothian TX Member No.: 10,496 Region Association: None 
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Pour beer in the cylinder and see how much it holds... Multiply by 4... (IMG:style_emoticons/default/beerchug.gif)
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| Rand |
Jul 7 2017, 03:03 PM
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#7
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Cross Member Group: Members Posts: 7,411 Joined: 8-February 05 From: OR Member No.: 3,573 Region Association: None |
The beer theory is much more accurate than the carb theory. (IMG:style_emoticons/default/biggrin.gif)
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| Mike Bellis |
Jul 7 2017, 03:54 PM
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#8
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Resident Electrician Group: Members Posts: 8,347 Joined: 22-June 09 From: Midlothian TX Member No.: 10,496 Region Association: None
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QUOTE(Rand @ Jul 7 2017, 02:03 PM)  The beer theory is much more accurate than the carb theory. (IMG:style_emoticons/default/biggrin.gif) Why waste good oil like Mark Henry when you can use shitty beer? (IMG:style_emoticons/default/confused24.gif) |
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| Porschef |
Jul 7 2017, 03:56 PM
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#9
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How you doin' Group: Members Posts: 2,180 Joined: 7-September 10 From: LawnGuyland Member No.: 12,152 Region Association: North East States
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Beer has carbs, especially IPA's. (IMG:style_emoticons/default/w00t.gif)
(IMG:style_emoticons/default/beer.gif) |
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| Jameel |
Jul 7 2017, 05:03 PM
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#10
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Member Group: Members Posts: 98 Joined: 6-October 15 From: Iowa Member No.: 19,239 Region Association: None |
Thanks everybody. I'll fill the jug with brew and get right back to you.
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| Mark Henry |
Jul 8 2017, 07:58 AM
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#11
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
If it's on a stand with the tin off it's easier to just remove a head. (IMG:style_emoticons/default/shades.gif)
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