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> Anyone tried an aircooled Flat 8, With two fours?
r_towle
post Jan 28 2005, 12:49 PM
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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
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lapuwali
post Feb 27 2006, 09:18 PM
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QUOTE (Cloudbuster @ Feb 27 2006, 06:52 PM)
QUOTE (Thorshammer @ Feb 27 2006, 06:42 PM)
The other idea I had was to use two FZR400 Yamaha Cylinders and heads and a custom made crank using the stock bore, but reducing the stroke so that I retained 640cc.

Just in case you didn't know, somebody is most of the way there

Drysdale

Not most of the way, but all of the way. Ian Drysdale started with FZR400 top ends (barrels and heads) on a custom case and crank. He did this in the mid 1990s, and has been continuing development for years both of his engines and the custom chassis he builds for these engines.

The Radical engine is essentially the same idea.

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.



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Posts in this topic
r_towle   Anyone tried an aircooled Flat 8   Jan 28 2005, 12:49 PM
Mueller   yep, a few have been done........I know I've p...   Jan 28 2005, 01:03 PM
sanman   I thought of it but I think it would be too lo...   Jan 28 2005, 01:05 PM
r_towle   i was hoping you would answer...you always think o...   Jan 28 2005, 01:05 PM
andys   It's been done both ways. I saw a pic years ag...   Jan 28 2005, 01:08 PM
r_towle   honestly cooling seems like a simple part of it .....   Jan 28 2005, 01:14 PM
Cloudbuster   Double displacement does not usually equal double ...   Jan 28 2005, 01:22 PM
nebreitling   i would think that you could never get double the ...   Jan 28 2005, 01:36 PM
Jake Raby   Already have a print in with moldex on the crank. ...   Jan 28 2005, 01:59 PM
synthesisdv   asked the same question a while back.... here...   Jan 28 2005, 02:19 PM
Cloudbuster   Hans Dahlbeck? Isn't he the brain donor in ...   Jan 28 2005, 02:23 PM
synthesisdv     Jan 28 2005, 05:29 PM
jwalters   http://www.914world.com/bbs2/html/e...   Jan 28 2005, 06:06 PM
Jake Raby   It won't cost a whole lot for me to do it, oth...   Jan 28 2005, 06:10 PM
Mueller   ...   Jan 28 2005, 06:13 PM
jwalters   http://www.914world.com/bbs2/html/e...   Jan 28 2005, 06:28 PM
Bleyseng   screw two motors! put four of them together...   Jan 28 2005, 06:48 PM
redshift   <...   Jan 28 2005, 06:59 PM
Bleyseng   I am hoping to squeeze by with $5000, buying ...   Jan 28 2005, 07:01 PM
Jake Raby   Here it cost 6K for a stock rebuild, but you can a...   Jan 28 2005, 08:16 PM
r_towle   how would you do oiling on the rear engine??? See...   Jan 28 2005, 11:23 PM
Brando   or connect them at the cranks... if you're go...   Jan 29 2005, 05:12 AM
SpecialK   Screw pistons...........someone stick a Huey Turbi...   Jan 29 2005, 05:18 AM
BigD9146gt   http://www.914world.com/bbs2/html/e...   Jan 30 2005, 05:19 PM
r_towle   ok, When if any was the earliest time that an ove...   Jan 30 2005, 06:09 PM
DuckRyder   Thinking out loud: Couldn't you slice one cas...   Jan 30 2005, 06:18 PM
r_towle   <...   Jan 30 2005, 07:21 PM
URY914   Here's what you need...   Jan 30 2005, 08:09 PM
redshift     Jan 30 2005, 08:14 PM
URY914   <...   Jan 30 2005, 08:18 PM
Air_Cooled_Nut  
  Jan 31 2005, 11:23 AM
jwalters   Wonder how the T4 would respond with a crank that...   Jan 31 2005, 02:47 PM
bondo   ...   Jan 31 2005, 02:50 PM
r_towle   yes, but what if you welded up the two motors to b...   Jan 31 2005, 05:28 PM
DuckRyder   ...   Jan 31 2005, 05:45 PM
jwalters   Very nice pic of a Duc!!! I am spankin...   Jan 31 2005, 05:52 PM
DuckRyder   ...   Jan 31 2005, 05:56 PM
JmuRiz   I know were're getting off topic here, but mmm...   Jan 31 2005, 11:06 PM
BigD9146gt   Nathan, I second that! MotoGP sould be great t...   Feb 1 2005, 12:34 PM
Al Meredith   I was out at Chuck Beck house (he lives outside At...   Feb 27 2006, 06:34 PM
Mueller   ...   Feb 27 2006, 07:15 PM
ClayPerrine   How about something like this??? http://www.perr...   Feb 27 2006, 07:51 PM
Mueller   ht...   Feb 27 2006, 08:01 PM
bd1308   i'll see if i can dig up two bus motors.... T...   Feb 27 2006, 08:02 PM
Brian Mifsud   Mike...while your in there pouring aluminum, how a...   Feb 27 2006, 08:22 PM
Brando   ...   Feb 27 2006, 08:54 PM
Brett W   The 180 degree 8 has a problem with second order i...   Feb 27 2006, 08:56 PM
Thorshammer   One of the problems must be the design of a crank ...   Feb 27 2006, 08:58 PM
alpha434   Why we couldn't use a Chevy crank: Counter ba...   Feb 27 2006, 09:03 PM
ClayPerrine   <...   Feb 27 2006, 09:06 PM
alpha434   ...   Feb 27 2006, 09:07 PM
lapuwali   ...   Feb 27 2006, 09:22 PM
Brett W   Sorry I was referring to a 180 degree V8. Don...   Feb 27 2006, 09:23 PM
JmuRiz  

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