8 cylinder using T4 crank

[Billyisgr8]

Just thinking in bed last night, it's getting closer to going ahead with a new shop for my projects. . Then it dawned on me. 8 cylinder, T4 crank , using either motorcycle rods and pistons or parts from a chainsaw, put the rods side by side. Completely make up new cylinders and heads with overhead cam, redo block or weld up a new one, aim for somewhere around 1600cc. Turbo fuel injection with crank fire spark. Something that could handle 30+ pounds boost, and all air cooled. 200-300 hp per litre?

Am I dreaming?

The rods side by side may be a bit of a problem, I could make them if necessary. Lamborghini does it and got me thinking.

What are your pro's and cons about this? Motor shape could stay flat, or be changed to low angle X pattern.

I have a cnc lathe and mill, so once head and cylinder design is drawn once it is easy to change if things are not working out.

Do you think I am wasting brain thinking time by this far out thought?


Kevin

[MASSIVE TYPE IV]

Nothing is too far out!

I never approached it the same way that you are contemplating but I do think that it would work.

Its just like Edison said "Our greatest weakness lies in giving up. The most certain way to succeed is to try just one more time"..... If you tried enough you could make it happen!

Let me know if you need some hep, things balanced and etc. I owe you for those manifolds anyway!

[Cloudbuster]

The Honda VFR 90 degree V-4 puts 2 rods on one crankpin. You could also go with a knife and fork connecting rod arrangement as used on Harleys (or Merlin/Griffon engines). Throw it all together in 2 cases cut and welded into a X configuration.

Avoid all the valve train issues and figure out how to make it 2 stroke too.

[yetibone]

two rods on one crankpin is NO PROBLEM! Most every V-angle engine uses this kind of setup. Some V6's even have to offset the journals of one crankpin to get even power strokes.

There would be some nasty harmonic imbalances by using that idea on a horizontaly opposed engine though. Both pistons connected to each throw would be traveling in the same direction, doubling the enertia on that crankpin. I don't know if the crank could take it.

[MASSIVE TYPE IV]

The 917 engine had a very wird way of doing this. I will look for some pics

[mharney]

Hey, the two stroke was done with it, why not?

I wonder whatever happened to that engine?

[69bug]

cool idea guys!!!


i think i see a problem already though with the crank

V8's use the same idea: 2 rods per journal

BUT!!!

each journal has 2 oil feed holes...and they are drilled so they are in the center of the rod that is riding on it


the T4 crank has 1 oil feed hole, and if you were to put 2 small rods on it, the oil hole would be right where the to rods touch...


just a thought


cool idea!!!

bye

[MASSIVE TYPE IV]

we can get past that... I have had some of my cranks double drilled for oiling passages already. No sweat. Worst case scenario would be a TIV crank used as a mock up/dummy and then have moldex make a crank from the sample.

[Billyisgr8]

Ohya keep it coming, all great ideas so far.

Kevin

[BOYGENIUS]

Have you ever thought about using 2 inline 4 motorcycle engines. Lets say take 2 Suzuki gsx 1300-R engines 1300cc and cut off the transmissions. Lay them down flat like a flat 8 and use a twin crank setup. You would need a gear setup to reverse the direction of rotation to the input shaft but it sounds like custom machine work doesn't scare you. Each engine already makes about 115 ftlbs of torque and 180 hp. so two would make 230 ftlbs torque and 360 hp N/A. Without replacing internal engine parts you could boost power to about 500 hp. That would be good for a 2.6L flat eight. Make an adapter plate to attach everything to the rear of a VW engine case and cut crank and you could use a VW flywheel and clutch and just bolt the engine in... I have been thinking about this for a while myself.

[Cloudbuster]

The Drysdale V8 is two FZR 400 (inline 4) on a common crank.

For some reason, doubling the displacement doesn't alway equate to double the horsepower. 2 instances:

The original CBR 900 had 50% more displacement than the same year CBR 600, yet made only 25% more power.

Pratt & Whitney created the R 4360 by sticking 2 14 cylinder radials end to end. Double the displacement, 50% more power. '4360' stands for the number of cubic inches (71.5L).

There's also the H configuration.

I think the easiest thing to attempt would be to put 2 TIVs end to end. Both cranks could be bolted to a big gear in the middle, indexed 90 degrees apart. This gear in turn drives a secondary layshaft, and sends output to the tranny, a la the 917.

I think its time that somebody ressurect the sleeve valve as well.

[MASSIVE TYPE IV]

as you add the two engines together the "motoring hp" increases and the net is lowered a bit..

[raygreenwood]

This is a common feature of the VW/Audi "W" series engines. By the way....lamborghini does not do this. VW does. They own lamborghini and make the engines. Ray

[MASSIVE TYPE IV]

Damn Ray, I never knew that..

Oh well, somuch for wanting a Lamborghini, its just another souped up mix between a rice rocket and a German car and probably made in Mexico starting in 2005.....Next thing you know they'll be front wheel drive.

[Billyisgr8]

I think its time that somebody ressurect the sleeve valve as well.

In my scool binder from 1987 ( all of 15 years old then) I have a rotary valve design sketched on a piece of paper . People have tried it before, but I have never seen any results yet. I think this design would work if the rotary part was a high grade of steel like iconel.

I also like the 2 stroke idea with a turbo. This would be the easiest since no valve train would be needed. I have no emisions test where I live now which is also great . I couldn't imagine a 14,000 rpm 8 cylinder 1600cc in a beetle. Can you say smoke show!!!!!

Kevin