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Old 02-03-2003, 04:35 PM
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Post multi engine race cars............

How do they get all the power to 1 rearend in a multi engine car. Those tractor pullers with like 5 blown big blocks or old drag cars from the 50's and 60's, how do they get everthing to work together without the motors tearing the vehicle apart, let alone get the power to 1 rearend. I always have wondered how they do this????

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Old 02-03-2003, 04:37 PM
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yes me too you would need some sort of variable connection between the two engines because straight gears would be a problem since one engine might be making 10 Hp more than the other (makes a big difference at 7000 rpm)
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Old 02-03-2003, 04:42 PM
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I think the cars that have 2 motors side by side have exactly what they look like....2 motors, 2 trans and 2 driveshafts but the rearend has 2 different housings and I guess that one motor powers one side of the rearend......Steve
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Old 02-03-2003, 04:46 PM
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What happens if one of those motors has more hp and torque than the other one going to the rearend??? I guess I just repeated stoned puppys question.

[ February 03, 2003: Message edited by: onebadmerc ]</p>
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Old 02-03-2003, 05:06 PM
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some of these cars engines were hooked together side by side with large link timing type chains, some were meshed together at the flywheel ring gear,(one turning in reverse) the fore and aft ones were sometimes simply bolted together with an adapter, the sidewinders were generally done with chain,all kinds of ways to do it, you know about the mother of invention.
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Old 02-04-2003, 06:51 AM
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well i wonreded that and i did some reaserch and most had a custom machined rearend but dont be fooled i must have took one hell of a machinst to rig up a rear that took twin drive shafts also some used a type of chain and gear system to turn one rear end and as for those tractor pullers the unlimited class is where you see the multiple
engines and as for how they do it most use a very complicated set of gears all leading to one rear end very difficult stuff and i think i will stick to just one engine.trans.rear. powering my car/truck at once
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Old 02-04-2003, 07:48 AM
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That one has 2 350hp+ motors. One in the front, one in the rear. Each has it's own automatic transmission. It's AWD, of course. There's a video clip somewhere of it doing a burnout for SCC's Ultimate Street Car Challenge. The guy put the front tranny in reverse and the rear tranny in drive and floored it. It's the sickest burnout I've ever seen. Found pics of the burnout here - <a href="http://www.sportcompactcarweb.com/features/0203scc_uscc13/" target="_blank">http://www.sportcompactcarweb.com/features/0203scc_uscc13/</a>

It also ran a 10 second 1/4 mile on street tires....in one try. (0-60 came in 3.33 seconds!)

-MK2TMR2
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Old 02-04-2003, 08:07 AM
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Where's you see the vid? I couldn't find it. Steve
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Old 02-04-2003, 08:17 AM
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[quote]Originally posted by 5.0Towncar:
<strong>Where's you see the vid? I couldn't find it. Steve</strong><hr></blockquote>

I didn't get it from that site. I've seen it posted elsewhere. I'll try to dig it up.
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Old 02-04-2003, 03:58 PM
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The idea that both, or all the engines needing to be timed together, or of equal horsepower is untrue. The engines don't even need to be from the same manufacture. I pulled a modified tractor that ran 2 or 3 Aries motors, depending on if it was a state or national event. The guys running wedge motors could run one more motor than me. The two front motors where end to end with a coupler that was splined to the crank of the rear motor, and bolted to the flex plate of the front. The third motor that could be added, mounted behind and above the front two. It had a stub shaft that mated to a custom gearbox that the front two ran threw as well. The transmission was behind that. Hooking motors end to end is quite easy. None of my motors where the same size, compression ratio, blower boost, or ignition system.

TV Tommy ran 4 motors with a 4X4 setup. Two pairs end to end, and the pairs side by side. One facing forward and the other backwards. The two pairs where then mated together by using the starter ring gear. The pairs needed to be hooked together to keep the motors driving the front wheels from over reving when the front tires lost traction.

The idea of running two transmissions and a custom rear has been tried as well. You take two IRS chunks that are geared the same and hook them together with a short drive shaft. I imagine a live axle could be done with a stub shaft between the chunks as well. A posi unit of some kind would keep one motor from reving higher than the other.

Here is a sight with pics of some of the odd ball twin motor drag cars that have come down the pike. Not much tech info though. Dan

<a href="http://www.geocities.com/twicemotor/index.htm" target="_blank">http://www.geocities.com/twicemotor/index.htm</a>
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