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> Anyone tried an aircooled Flat 8, With two fours?
alpha434
post Feb 27 2006, 09:22 PM
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QUOTE (lapuwali @ Feb 27 2006, 07:18 PM)
The wackiest design I've seen was a "V8" made by simply gearing the output shafts of two complete ZX-9 engines together to a common output shaft (one through an idler), with the engines sitting "cheek to cheek". This made complete engine changes very easy, as long as you had a supply of used ZX-9 engines. It was very wide, but was built for a class of sportcar racing that required two side-by-side seats, anyway, so the width wasn't a problem. I believe a pair of ZX-12 engines were used by the same guy in a different car.

Like a W12?

Where do you guys find that stuff? These are Formula classes? All we have around here is SCCA.... F. Vee and Mazda star stuff.
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Brett W
post Feb 27 2006, 09:23 PM
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Sorry I was referring to a 180 degree V8. Don't know much about the flat 8. I would guess it would be pretty close to balanced.
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JmuRiz
post Feb 28 2006, 09:31 AM
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QUOTE (DuckRyder @ Jan 31 2005, 03:45 PM)
QUOTE (jwalters @ Jan 31 2005, 04:47 PM)
Ala Ducati--if the Duc had four cylinders.......

Trying to make a desmo valve system work without overhead cams would be ... probably impossible.

Once you've adjusted the valves on one, you won't ever try to convert something TO Desmo.

And there is a 4 cylinder Ducati, the DesmoDeci (vs DesmoDue)

Well, there are a zillion styles of demodromic valvetrains. I came across this site a while back, TONS of info, movies and pics of different systems. You can have gear driven valves w/o OHC engine...it's just not as easy (IMG:http://www.914world.com/bbs2/html/emoticons/wink.gif)
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r_towle
post Jul 21 2012, 04:37 PM
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It's time for this to finally happen
Parts heading to the machine shop with a goal of a spring firing
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sixnotfour
post Jul 21 2012, 05:26 PM
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wow a Aircooled Pushrod Flat 8
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seanery
post Jul 21 2012, 05:45 PM
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QUOTE(r_towle @ Jan 28 2005, 02:49 PM) *

Has anyone tried to build a flat 8 with two type 4 motors?

Theoretical questions.
Assumptions
2 motors each producing 100 HP and 100 Lb/ft of Torque

The motors are end to end, front to rear.
The cranks are fastened together either bolted or welded.

1) Would you get 200hp and 200 lb/ft or torque? or is there some multiplier...seems like you would produce more torque..

2) could it be done with a single ignition system available for sale off the shelf.

3) could you do it without two distributors? crank fired ignition system..I am thinking that there could be a wheel placed in between the motors to give you something to time from.

4) I am assuming either a nice FI system, or four carbs.

Has anyone done this?
I would like to see some articles or web pages if this has been done in the aircooled world...

Thanx in advance
Rich


And I'm crazy for wanting to put a 928 in an old GMC? (IMG:style_emoticons/default/shades.gif) (IMG:style_emoticons/default/biggrin.gif)
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r_towle
post Jul 21 2012, 05:48 PM
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Yes, you are.
At least it am staying in the family.
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BigD9146gt
post Jul 21 2012, 06:02 PM
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Theres a guy down in Melbourne who has made flat 8's out of 6's, says they are really easy and has moulds for the 908 style fan shrouds... problem is my last boss has been trying to get parts off him for some years now. This is one of my all time projects I wish to make. Cudo's to you for trying it with the type 4 stuff... will be fun to fallow your progress.
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rick 918-S
post Jul 21 2012, 06:07 PM
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Totally do-able with some planning. I'll be watc (IMG:style_emoticons/default/popcorn[1].gif) hing this one!
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Woody
post Jul 21 2012, 07:43 PM
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(IMG:style_emoticons/default/popcorn[1].gif) (IMG:style_emoticons/default/popcorn[1].gif)
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jwhcars
post Jul 21 2012, 08:58 PM
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The 2 factory 914/8 cars had 908 engines in them. The orange one had the full race MFI engine, and the grey one had carbs and was de-tuned for street duty.
There is one in the Porsche museum.
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Dr Evil
post Jul 21 2012, 09:11 PM
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(IMG:style_emoticons/default/popcorn[1].gif) I will be doing this someday if no one else does...probably even if they do.
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sixnotfour
post Jul 21 2012, 09:17 PM
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Doc you should do a flat 12 Covair






V16 inspiration
http://www.gtspirit.com/2012/02/01/video-c...ith-v16-engine/
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sixnotfour
post Jul 21 2012, 09:33 PM
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(IMG:style_emoticons/default/beer3.gif)

and these heads;

http://members.home.nl/r.vd.meulen/photopa...pics/dist07.jpg


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sixnotfour
post Jul 21 2012, 09:48 PM
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http://home.swipnet.se/motor/custom/
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seanery
post Jul 22 2012, 06:04 AM
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QUOTE(jwhcars @ Jul 21 2012, 10:58 PM) *

The 2 factory 914/8 cars had 908 engines in them. The orange one had the full race MFI engine, and the grey one had carbs and was de-tuned for street duty.
There is one in the Porsche museum.


There are two in the Porsche museum (IMG:style_emoticons/default/wink.gif)
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Mueller
post Apr 13 2018, 07:43 PM
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Back to the flat 8 talk....

Found out Ferrari uses flat-plane crankshafts in some of their V8's so I went on eBay and voila... I found this crank from a 328, 73mm stroke instead of the Porsche 908 66mm stroke.

Guy wanted $850 plus shipping, I offered about half that, he didn't quite tell be to F off, but I think he wanted to with his response, asked me to call if serious.

Anyway, while not as accurate as the 908 crank it seems like a cheap alternative.

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Elliot Cannon
post Apr 13 2018, 10:12 PM
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There was a guy, Richard I think, who used to show up at the G&R all the time who planned to build an 8 cyl. type IV. Richard are you out there?
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billh1963
post Apr 14 2018, 04:41 AM
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Isn't there a guy working on casting new 3.6 cases? Maybe he could cast one for an 8
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DRPHIL914
post Apr 14 2018, 05:47 PM
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QUOTE(billh1963 @ Apr 14 2018, 06:41 AM) *

Isn't there a guy working on casting new 3.6 cases? Maybe he could cast one for an 8

i cant even begin to imagine what that would cost!
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