Twin straigh 6`s

Dawm.....I think we've covered about everything in this thread.....I got a suggestion.........why 6's? We've covered v8's, v12's...., we've side tracked the v10's.....I say for ****s and giggles........2 Pontiac straight 8's.........

 

HAHAHAHA, I’ve got a twin 225 set up mocked up in my garage right now<O
It’s going to be in a 34 international.
<O</O<O
Why? You ask, what's the profit? That’s allot of work you say, why not <OUse a v12 you say, and you want to know my answer?<O</O
<O</OBecause I ****ing feel like doing it and I want to see how it will run,<O</O
Because 350s bore the hell outta me, because!!!!! HOT RODDING,BECAUSE
GOLF, FOOTBALL, AND BASEBALL ONLY TAKE ONE BALL!<O</O
<O
Balls to the wall or nothing at all boys. <O</O



worm drive them into a single ******, chain drive is noisy, and you have to grease it, unless you install an oiler.. if it works then do it, don't limit yourself to this, there might be a nother way that's evea better.

 

You could use a pair of Jaguar six cylinder engines. The Jaguar V12 uses the same cylinder heads, except one is right handed and the other left handed. Basically you would be constructing a Jag V12 with two crankshafts and two bottom ends. I believe BMW do the same thing with their V12. All these engines have overhead cams.

 

i had to reverce the right hand block, it made one hell of a Y those to slant 6s, i might just do it the other way around and have the bottom ends far apart, just for ****s and giggles.

 

Nope. Not only are they not the same, they're not even close. SOHC vs DOHC

 

I like the way you think..............'cept I don't know about the air cooled boxer motor....sounds do-able, but an air cooled one seems as though it would be a bigger PITA.......
I have thought about building a straight eight...........Maybe a couple of
pushrod or OHC 4 cylinders end to end.............

 

Would you not get away with non fan cooled air cooled barrels and pistons if you used a watercooled head?

 

Here's an article from an Australian Hot Rod magazine from the late 60's, reproduced in it's entirety for those that are interested in the build. You can see that the car was set up as AWD.





You might be interested to know that the car has survived, though no longer in running order.


There was also another dragster in the mid 60's down here that ran the same motors inline.
Regards.
Alex

 

a pair of 6-71's. both left hand engines running into a gearcase with the drive coming out of a center idler.

Used on M3 Sherman's in WW2. Called the GM 6046.

 

You sir are a wildman. I say that with admiration, of course.

I look forward to someday attending a racing event or cruise where every hotrod has a scratchbuilt or radically adapted engine. All these Proto-rods will be driven by guys who just can't find exactly what they're looking for, so they built it

 

Take a look at Packard TWIN SIX engines there could be some ideas there. Good luck with the project.

 

I saw a Corvair with twin Corvair motors in North Vancouver. The second motor was in the back seat. Not my Pint of brew but hats off to the builder anyways for attempting it.

 

Yeah...That is the car I was talking about in Post #22 of this Thread.

Thank you for Posting that.

Very cool...

 

BUILD IT! RACE IT! and don´t care the f***** about what some says, if you´re tech to do it, keep the tips and speed to the garage! Just for the fun, and the WHOOOPIE eyes on the V8 guys!

If i had been livin in the near, i come by to help, ( buts on the other side of world)

keep posted!!!!!!

 

What would they be installed into? Ever consider going with a a slant-6 Hyperpack setup instead? Bill

 

You may try looking at the McMaster Carr catalog online for a system to connect the motors. You can get chain that is a much heavier version of a standard timing chain in your engine. Just a thought, Bill

 

Twin Six was simply the name Packard gave to their V-12. It wasn't two, six cylinder engines

 

LEADED has the right idea. If you can do it, do it. Can't do much worse that wast some time and money. Couple of old six cylinder motors maybe.

 

Does that mean you would start with "a buzzin half dozen" and end up with a "a buzzin dozen"? Go for it. I was thinkin like a boat or pullin tractor drive.
GO FOR IT

 

Sure, but the (early) SOHC Jaguar 6 head, and the (late) DOHC Jaguar 6 head, both bolt onto the same identical blocks. The inline six came out with both these heads, but the V12 only uses the SOHC head (so far). As a result, there are only right handed DOHC heads, but the SOHC head comes both right handed and left handed for the V12. It would be quite practical to set up a pair of six cylinder jaguar engines, one with right handed SOHC head, and the other left handed SOHC head. It would be a straight bolt up.

 

How early are the SOHC Jags? What size? never saw one.

 

Many of the V12 Jaguar freaks are thinking about fitting the DOHC six cylinder four valve head onto the V12. This is a straight bolt on, except the front cover for the cam drive has to be fabricated (for one side). The heads themselves fit the block, either way, and the cams can be turned around end for end on the head. Pistons need to be changed because the four valve heads are pent roof, the two valve heads are flat, (and use deeply dished pistons). But as the following article says, there are a host of other problems to consider.
http://www.jagweb.com/aj6eng/stretching.php
But you can also go the other way, and fit the V12 SOHC two valve head to the six cylinder inline engine. The above article actually briefly mentions this, and says it is an easy swap. Either the left or right hand heads bolts straight on, Nobody does this, because they are not crazy like us. But it would be possible to build a pair of inline sixes with opposite mirrored heads built from V12 heads, manifolds and suitable pistons.

 

torchman Can you post the link for that ad? Were you gonna buy that thing?

 

to be told I cant do it makes me just go ahead and do it regardless of how stupid it may seem. Put an old 312 in the back of Renault beetel back in 65 cause some one said it cant be done. Iv always wanted an unusuall motor, have one in the form of a boat anchore, 326 Cu" flat straight 8 Studiebaker president. now I want to join 3 V6 motors together just to see jaws drop.

 

Well, let's think about this.

The original Jag XK six is a DOHC with hemispherical combustion chambers. Yes, it's a hemi.

The Jag V12's are all SOHC. They came in two flavors, the flat head engine and the HE engine. The flat head engine had - flat heads, duh - there was no combustion chamber in the head. The combustion chamber was in the piston (dished crowns).

The later V12s were called HE for High Efficiency. They had a high turbulence combustion chamber and ran very high compression ratios and very lean mixtures. All the HE motors were fuel injected. The head was designed by a guy named May, so sometimes these motors are called May Head motors. The Chevy Vortec that came along somewhat later is a derivative of this earlier Jag design.

Then there is the another Jag six that debuted in the XJ40. This is a DOHC slant six.

Now the bolt centers and head bolts are the same on the V12 and the later slant-six engine. So, there has always been speculation as to bolting a set onto a V12 to make a DOHC V12. One head would have to have ots end cut of and rewelded on the other side to get the cam drives onto the right end.

No one has ever actually done this although this has been the topic of speculation and bench racing. One would face significant challenges in setting up the chains to drive the double cam shafts, given the real estate you have to work with at the front of the V12. The induction system would prove very challenging to design as you would need to maintain space for the distributor (nestled in the center of the vee, unless of course if you went to a distributorless ignition).

Some have also postulated about placing a pair of XK heads atop the V12. In fact, Jaguar themselves did in fact build an engine like this. There were meny problems and the motor was deemed not practical. For one thing, the XK heads are very large, high and heavy. The center of gravity of the completed engine is not amenable to a sporting automobile. There were issues with getting the cam drives to work and also is designing an induction sysem that would clear (space in the center of the vee is at a premium when two of these wide heads are mounted atop the V12 block).

So, for all practical purposes, there is no way to create a DOHC Jag V12 using Jag 6 cylinder heads. THis is really a shame, since the ultimate performance capability of the Jag V12 was stifled by the breathing limitations of the heads. Racing V12s always used the flat heads. THe bottom end of these motors is strong as a battleship and the displacements can be opened up to 8 liters or more (stock is 326 cubic inches). There just was no easy way to get them to breathe in support of ultra high performance. A friend of mine fitted twin Whipple superchargers to his V12; his car did scoot along quite nicely.

I'm not sure what you would gain by running V12 heads on an XK engine. Except to make the XK engine perform more poorly. Even if you were running two XK engines side-by-side, you would probably be better off with the XK heads.

Claims of 'just bolt it all together' because a few bolt holes line up does not mean it will work.

 

That would be very cool.

 

It has been done - I remember reading about it. The engine was installed in a V12 E type convertible - red IIRC. I think it was converted by a spe******t in the US. But you´re right; the conversion involved a lot of spe******t engineering to get it to work.

 

Yes it has certainly been done before, there is an article with pictures around on the internet somewhere I have seen. And yes, fitting a pair of V12 heads to a pair of six cylinder engines would be a backward step. But it DOES make building matching left and a right handed six cylinder engines possible using off the shelf standard parts. And that is the topic of this thread.

 

How about one of these?

Two GMC 351 inline 6 factory twinned. The mighty GMC Twin-Six engine





Frank

 

LOL. There are no off the shelf standard parts that would make that happen. Hey, maybe I'm mistaken -- would you mind listing the part numbers of the Jaguar cam drive parts (sprockets, chains, chain tensioners) that would let you run V12 heads on an XK motor?

You are absolutely right, however, that this thread is about the fabrication needed to get a twin-motor situation going. It would be nice to see more twin-engine cars.