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Flat Engine - Very Interesting Reading
Posted by: flat_six ()
Date: November 10, 2017 08:56AM

Really great background on our favorite engine layout and its cousins.


Flat Engine Wiki

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Re: Flat Engine - Very Interesting Reading
Date: November 10, 2017 09:17AM

Check out the Porsche flat 12 and the Napier H24. BRM had an H16, but I think it was water cooled.

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Re: Flat Engine - Very Interesting Reading
Posted by: 66vairman ()
Date: November 10, 2017 09:27AM

Interesting and shows that opposed engines use different crank pin arrangements.
It's why the old VW fours sound like they fire evenly and the Saburu's sound like an old Harley twin when you install loud mufflers.

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Re: Flat Engine - Very Interesting Reading
Posted by: American Mel ()
Date: November 10, 2017 10:24AM

66vairman Wrote:
-------------------------------------------------------
> Interesting and shows that opposed engines use
> different crank pin arrangements.
> It's why the old VW fours sound like they fire
> evenly
and the Saburu's sound like an old Harley
> twin when you install loud mufflers.


Maybe some VW fan could chime in here.
I was once told by a good friend who was heavily into bugs,
that there is one cylinder that has slightly restricted cooling air flow to it due to the position of the oil cooler.
Because of that, VW designed 3 degrees of retard into the distributor cap for that one particular cylinder, so it would run slightly cooler.
And that is why VW's flat four sounds so distinctly different from any other engine out there.

Any one want to verify, or debunk that?

.

WA. state, 1 mile south of the Canadian border
'66 Monza Coupe - 4spd, 140 Daily driver beater
'67 Monza Vert. - PG, 140 Daily driver beater

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Re: Flat Engine - Very Interesting Reading
Posted by: MattNall ()
Date: November 10, 2017 10:55AM

You are correct on #3 [ driver's front] having airflow restricted by the placement of the oil cooler and the "custom distributor" with a mark on the Housing for #1 and an offset drive key.... as well as when installing the Dist. drive gear... it had ONE position...


3 deg. causing a difference in sound??





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Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: Flat Engine - Very Interesting Reading
Posted by: corventure Dave ()
Date: November 10, 2017 11:35AM

Interesting that this article about flat engines, only bothers to delve into the suspension of the Corvair, but not other vehicle examples!eye rolling smiley
The author kind of gets off track!hot smiley

Corventure Dave

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Re: Flat Engine - Very Interesting Reading
Posted by: flat_six ()
Date: November 10, 2017 12:26PM

corventure Dave Wrote:
-------------------------------------------------------
> Interesting that this article about flat engines,
> only bothers to delve into the suspension of the
> Corvair, but not other vehicle examples!eye rolling smiley
> The author kind of gets off track!hot smiley
>
> Corventure Dave


That's the beauty of Wikipedia. Anyone can go in and edit. So, who wants to set them straight?



Edited 1 time(s). Last edit at 11/10/2017 12:27PM by flat_six.

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Re: Flat Engine - Very Interesting Reading
Posted by: flat_six ()
Date: November 10, 2017 12:58PM

Actually I just changed it. Let me know what you think!

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Re: Flat Engine - Very Interesting Reading
Posted by: American Mel ()
Date: November 10, 2017 01:19PM

Much better!

WA. state, 1 mile south of the Canadian border
'66 Monza Coupe - 4spd, 140 Daily driver beater
'67 Monza Vert. - PG, 140 Daily driver beater

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Re: Flat Engine - Very Interesting Reading
Posted by: corventure Dave ()
Date: November 10, 2017 03:27PM

thumbs upthumbs upthumbs up

Corventure Dave

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Re: Flat Engine - Very Interesting Reading
Posted by: Pacerace ()
Date: November 13, 2017 05:44AM

66vairman Wrote:
-------------------------------------------------------
> Interesting and shows that opposed engines use
> different crank pin arrangements.
> It's why the old VW fours sound like they fire
> evenly and the Saburu's sound like an old Harley
> twin when you install loud mufflers.


Actually both the old VW flat 4 and the Subaru flat 4 use the same crankshaft arrangement. The turboed Subarus have that grumble due to the unequal headers going into the turbo. When you put equal length headers on them they sound more like a traditional 4 cylinder. The non turbo engines don't have much of the Subaru rumble.

________________________________________________________

Chandler
Roswell, GA.


1965 Corvair Monza 110/4sp Coupe

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