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Author Topic: P-38 engines left/righ  (Read 1742 times)

Offline MiloMorai

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P-38 engines left/righ
« Reply #30 on: September 05, 2004, 01:37:32 PM »
This is a milling machine

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Offline GScholz

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P-38 engines left/righ
« Reply #31 on: September 05, 2004, 01:37:36 PM »
You still increase volume whatever you alter. Having two cylinders with the same bore, stroke and volume, yet different compression ratios is physically impossible. Something must be different.

And what's with the attitude? Are you incapable of having a discussion without being abusive?
« Last Edit: September 05, 2004, 01:41:06 PM by GScholz »
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Offline Staga

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P-38 engines left/righ
« Reply #32 on: September 05, 2004, 01:52:42 PM »
Difference in DB's compression ratio between left and right bank is so small that easiest way to change it would be using cyl-head gaskets with different thickness.
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Offline MiloMorai

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« Reply #33 on: September 05, 2004, 01:56:51 PM »
It gets tiresome when some are talking nonsense. :)

They mill some off the head as in the example given in a previous post, which you fail to comprehend Scholz.

read carefully(numbers are for example only)

piston swept volume = 1000cc
clearance volume = 100cc

So (Swept Volume + Clearance Volume) / Clearance Volume

(1000+100)/100 = 11:1

remove 10cc from the clearance volume > 90cc

(1000+90)/90 = 12:1

You have 2 heads, so one head has its volume decreased by 10cc, the other has nothing removed. Guess what? You then have 2 compression ratios on a single engine.
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Offline MiloMorai

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P-38 engines left/righ
« Reply #34 on: September 05, 2004, 02:01:38 PM »
Quote
Originally posted by Staga
Difference in DB's compression ratio between left and right bank is so small that easiest way to change it would be using cyl-head gaskets with different thickness.


Yes Staga that is another way, but would suggest using 2 gaskets on one side and one gasket on the other. Saves on the parts count, though it does give another gap for blow-by.
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Offline GScholz

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P-38 engines left/righ
« Reply #35 on: September 05, 2004, 02:02:23 PM »
If you remove 10cc from the clearance volume YOU REDUCE THE TOTAL VOLUME OF THE CYLINDER! That's what I have been saying all along!
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Offline MiloMorai

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P-38 engines left/righ
« Reply #36 on: September 05, 2004, 03:08:17 PM »
Quote
Originally posted by GScholz
If you remove 10cc from the clearance volume YOU REDUCE THE TOTAL VOLUME OF THE CYLINDER! That's what I have been saying all along!


Is that why you kept on mentioning different stroke?

But glad you finally saw the light in your EDITED post. To bad you did not make a seperate post for your correction.

Now to put a wringle in, I believe the head of the DB engine was part of the cylinder block.
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Offline GScholz

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P-38 engines left/righ
« Reply #37 on: September 05, 2004, 03:28:57 PM »
This is beyond moronic Milo. I edited that post only minutes after posting it when I noticed the error, 4 1/2 hours ago. Before you responded to it.


Quote
Originally posted by GScholz
You're right that the documents only list a 0.2 difference in compression ratio, but that difference is just an effect of either a difference in stroke or volume. I'm guessing stroke.


What is wrong with my initial post to your question? If there is a difference in compression there MUST be a difference in either volume or stroke if the bore is equal. The PDF does not state any difference in bore, stroke or volume, probably because the difference is minor, but the must be a difference. I guessed in stroke. You guessed in volume.
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Offline justin_g

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P-38 engines left/righ
« Reply #38 on: September 05, 2004, 04:25:59 PM »
Bringing this back to topic, both Daimler-Benz and Allison bolted two V-12 engines together to make monster double-vee 24 cylinder engines!  The V-3420 and DB-610 mounted two V-1710/DB 605 V-12s side by side in a double-vee configuration and geared the crankshafts together to make one engine.

V-3420 as used in P-75

DB 610 as used in He 177
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Offline mora

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P-38 engines left/righ
« Reply #39 on: September 05, 2004, 04:28:46 PM »
Quote
Originally posted by GScholz
The PDF does not state any difference in bore, stroke or volume, probably because the difference is minor, but the must be a difference. I guessed in stroke. You guessed in volume.


Are you sure the total volume is even stated in that document? Usually it's the stroke volume which is stated, like in automobiles for example.
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Offline GScholz

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« Reply #40 on: September 05, 2004, 05:00:55 PM »
I don't know.
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Offline MiloMorai

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P-38 engines left/righ
« Reply #41 on: September 05, 2004, 06:29:17 PM »
Quote
Originally posted by GScholz
This is beyond moronic Milo. I edited that post only minutes after posting it when I noticed the error, 4 1/2 hours ago. Before you responded to it.



Now the insults start, but what else to expect from him since he did not have a clue what he was talking about and still dosn't.

Actually it was 8 minutes. :)

Yah and I had my reply sitting there for 4:35 will I did some other things.:) Did some text changes in that 4:35 as well.

You were floundering around like a fish out of water.
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Offline GScholz

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P-38 engines left/righ
« Reply #42 on: September 05, 2004, 08:51:16 PM »
This is pointless. You're back on ignore for good. Goodbye.
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Offline VO101_Isegrim

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P-38 engines left/righ
« Reply #43 on: September 06, 2004, 02:03:01 AM »
Typical MiloMoron thread. :aok
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Offline Guppy35

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P-38 engines left/righ
« Reply #44 on: September 06, 2004, 02:58:00 AM »
Quote
Originally posted by Delirium
I seem to remember there was some constant annoying engine problems with the #1 or left hand engine on some of the p38s.

This is a good question for Slack, I remember him posting something on it some years ago.


LOL that was my fictitious P38F that always leaked oil from the left engine I think :)

There were two different engines for the 38.  With the P38F for example it was a -49 Allison or a -53.  One swinging the prop left and one right.

It couldn't have been too tough to build the engines to swing the prop one way or another.

Kinda like the Griffon Spits turning the prop the opposite of the Merlins.

It gave the guys transitioning to Griffon Spits fits, if they weren't warned ahead of time as they cranked in rudder trim in the wrong direction based on their Merlin engined Spit experience.  Lots of sideways take offs that way :)

Dan/Slack
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