BrandonsZ Posted September 23, 2004 Share Posted September 23, 2004 I was wondering (I know I do a lot of wondering here) but has anyone thought of putting two V6 engines in tandum for a cheap way to duplicate the smoothness of a V12 with the power of a V8? It would probably be an interesting project and the braging rights for originality I think would be high. I don't much care for the free space that is left in front of the SBC. But it's such a minor point. Quote Link to comment Share on other sites More sharing options...
jonzer12 Posted September 24, 2004 Share Posted September 24, 2004 How would you connect two cranks to 1 transmission? Also you would have balance power, it would weight a ton, you would have to cool 2 engines, and a host of other problems, absolutely no advantage to simply building a single engine with the output of two stock engines. However I do remember the adds for the twinstar eldorado's... Quote Link to comment Share on other sites More sharing options...
BrandonsZ Posted September 24, 2004 Author Share Posted September 24, 2004 I remember watching the tractor pulls and they had tandum engines, parallel engines, and mixturs of this. Probably not very easy, but I think it's possible. Only for the eccentric though. Quote Link to comment Share on other sites More sharing options...
BrandonsZ Posted September 24, 2004 Author Share Posted September 24, 2004 maybe a clutch between them? You could have 1/2 power and great gas mileage and when you want to drag, you start up the second one, let out the second clutch and and pow instant double horsepower. This sounds fun, but probably isnt. Quote Link to comment Share on other sites More sharing options...
blueovalz Posted September 24, 2004 Share Posted September 24, 2004 I believe Ford contracted Roush to do such a thing with their aluminum block V6 many years ago (for an experimental V12), and has been experimented with by others since then. Custom crank and cams was the biggest hurdles. Quote Link to comment Share on other sites More sharing options...
datsunlover Posted September 25, 2004 Share Posted September 25, 2004 Would it not be possible to just 'bolt' the back side of the front engine's crank to the front of the rear engine? (assuming a front/back layout ussing two existing V6 motors) It would take some math to figure out the angle to attach the two engines.. so as to get a smoth running firing order and such. And a custom fuel/ignition setup of course.. I've met a guy who stuck two rotary engines together (back to back, custom center shaft) and runs 'both' (although it's really one engine now..) off ONE set of sensors/harness/ecu.. a little easier with a wankle I supose, but I think anythig is possible. Sounds cool! Quote Link to comment Share on other sites More sharing options...
Guest crayZ Posted September 27, 2004 Share Posted September 27, 2004 Would it not be possible to just 'bolt' the back side of the front engine's crank to the front of the rear engine? (assuming a front/back layout ussing two existing V6 motors) It would take some math to figure out the angle to attach the two engines.. so as to get a smoth running firing order and such. And a custom fuel/ignition setup of course.. I've met a guy who stuck two rotary engines together (back to back, custom center shaft) and runs 'both' (although it's really one engine now..) off ONE set of sensors/harness/ecu.. a little easier with a wankle I supose, but I think anythig is possible. Sounds cool! Back to back with two twin rotor would mean that the custom center shaft would be shaped something resembling of a 'T'? If it were to be setup like that, the engine bay would need to be wide enough to host it. The same goes for two V6 if they were to be setup like this.. Quote Link to comment Share on other sites More sharing options...
datsunlover Posted September 27, 2004 Share Posted September 27, 2004 Back to back with two twin rotor would mean that the custom center shaft would be shaped something resembling of a 'T'? If it were to be setup like that' date=' the engine bay would need to be wide enough to host it. The same goes for two V6 if they were to be setup like this..[/quote'] Huh? As for rotary, it is a STRAIGHT shaft, with splines for the rotor's to drive.. it's basicaly just bolting the two twin rotor engines together with longer bolts..like a sandwich. It's hard to explain here.. but two V6 engine's bolted together crank to crank is kind of the same idea.. either way, why would the engine bay need to be wider? Quote Link to comment Share on other sites More sharing options...
auxilary Posted September 27, 2004 Share Posted September 27, 2004 this is what a 4 rotor eccentric shaft looks like and a 4 rotor (old 2 12a variant) Quote Link to comment Share on other sites More sharing options...
Zgringo Posted October 6, 2004 Share Posted October 6, 2004 It's really quite simple to connect two engines. Use a chain coupler, and put one half on the crankshaft flywheel end and the other half on the crankshaft pulley end then set the front engine half way between the power strokes of the rear engine and hook up the chain. I had two 440 Dodge mag's installed in a 32 Bantam this way. Worked great. Problem was getting it to hook up. Quote Link to comment Share on other sites More sharing options...
NZeder Posted October 6, 2004 Share Posted October 6, 2004 it's basicaly just bolting the two twin rotor engines together with longer bolts..like a sandwich Well not quite that simple - yes it looks like this when it is complete but I believe there is more involved. I am looking at doing just that a 4 rota - using custom eccentric shaft, ends and coupler with standard 13b rota's and housings. Hey did you know that corvette has looking at a wankel? see http://www.monito.com/wankel/corvette.html even a 4 rota They say a 2 rota is like a 6 cylinder so a 4 would be like a 12 but much smaller and only 5 moving parts internally, the shaft and the 4 rota's. How many in a V12 at least (assume 4 values per cylinder) 50 at a quick count more like 150. Quote Link to comment Share on other sites More sharing options...
Guest NavyZ Posted October 17, 2004 Share Posted October 17, 2004 ZGringo is absolutely right. We basically bolt two sixes up together with the chain coupler to make a "V-12" on our small craft in the navy. It's actually very simple, and produces a lot more power. Not nearly as smooth or as much power as a regular V-12, but an interesting way to do it, and not quite as expensive. Quote Link to comment Share on other sites More sharing options...
BrandonsZ Posted October 18, 2004 Author Share Posted October 18, 2004 Thanks NZeder. That's my point, cheaper, but lots of power. Now consider two 3.8L V6 from the Thunderbird SC (supercharged) in the late 80's early 90's. That engine was really nice even on that fat 4000lb+ Thunderbird, just one could be compared to a V8, but two? Possible salvage? It could be really cheap and when you pop the hood, BAM! two engines , people would go nuts . A nice drag car with a higher possible top end than a large V8, but it might drive decent on a country road with the right suspension. Hooking up might be trouble with so much weight over the front wheels. Imagine those nay-sayers when you pop the hood Quote Link to comment Share on other sites More sharing options...
auxilary Posted October 18, 2004 Share Posted October 18, 2004 correction, the ford 3.8L v6 motor is a pile of steaming poo. headgaskets are notorious for failing Quote Link to comment Share on other sites More sharing options...
ZR8ED Posted October 19, 2004 Share Posted October 19, 2004 A bit off topic but where else can you talk about twin engines in a car. I read in Kit Car mag a while back about some dudes with too much $ take 2 350 chevy's and weld them together, joined the cranks and made a single V16 (no motor adapters.. it was a single unit when completed. Also up here in the Formula 1200 1600, and 2000 series, some wacko tried to get past the ruels with a v8 made from a custom block and crank and took two GSXR 750 engines and made a wicked and light V8 that could be lifted by one guy.. even with oil in the crank case!!! Got disqualified instantly! hehehe wicked car nonethe less. Quote Link to comment Share on other sites More sharing options...
Guest 9c1cruiser Posted October 26, 2004 Share Posted October 26, 2004 Hey all, phew...i'm back from overseas (for now) and am leaving again in January with my new unit that is already there. Anyway, now that the internet is all hooked up, i have spent hours on all the Z-Car sites! I have day-dreamed of doing GM 60-degree V6's together before. Two early 2.8L's maybe.....cheapest way to go and plenty of parts (junk-yard; new replacement; AND PERFORMANCE PARTS). They would take up less space than the 90-degree V's? They would definately be lighter....there is even an aluminum block that was and still is offered along with aluminum heads. BUT, what you need to do is find two really tiny V6's maybe....less length means better balance for the cams and crank etc etc. Oh yeah....that Monito site has been one of my favoerites since it came out....one of the most informative sites out there. Yes I am a huge rotary nut. Quote Link to comment Share on other sites More sharing options...
Guest 9c1cruiser Posted October 26, 2004 Share Posted October 26, 2004 Okay, here you go: http://www.60degreev6.com This is where you find out info on the engines. Quote Link to comment Share on other sites More sharing options...
Guest Vegasguy Posted December 9, 2004 Share Posted December 9, 2004 In reference to how do you connect the engines, here's this: I remember reading about this a few (many) years back. Emerson Fittapaldi used to race a VW bug down in Brazil with 2 air-cooled flat fours tied nose to nose. When I say "tied", I literally mean the cranks were bolted together. From what I remember, It ran like a scalded cat, spanked everything in site and usually blew up halfway through the race. Schematic here: http://www.thesamba.com/vw/forum/album_page.php?pic_id=26562 Pics here: http://www.thesamba.com/vw/forum/album_page.php?pic_id=26561 http://www.thesamba.com/vw/forum/album_page.php?pic_id=26560 You know, mounted under the hatch with nothing up front might make for a VERY amusing Z car......hmmmmmm VegasGuy 71 240 on the rotisserie 78 L82 SBC waiting to go in Quote Link to comment Share on other sites More sharing options...
VRJoe Posted December 9, 2004 Share Posted December 9, 2004 On Monster Garage they used the chain hookup to hook two V8s together to turn a WW II jeep into a tractor pull monster. Typical Monster Garage, but interesting. - Joe Quote Link to comment Share on other sites More sharing options...
Chewievette Posted December 13, 2004 Share Posted December 13, 2004 You were saying?? I knew I saw this somewhere. GMC has been there AND done that. From what I remember it was a miserable failure. I also remember someone doing two 350 chevys on a common block, making a V16 but that was a one off type of thing. Quote Link to comment Share on other sites More sharing options...
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