Does anyone know what would be involved in, or if it is possible, to use the crank, pistons, rods etc... from a 2.4L to stroke the 2.0?As I understand it the block is the same, and I've got two lying around for an all-motor project I am currently building. Any input would be appreciated.

Cheers-
B4S

 

Honestly I don't know for sure, hopefully someone here does. However I'm gonna take a guess and say no go. The blocks must have some differences to accomadate the 2.4's balance shaft setup in the pan. While I know you don't need the balance shafts, I think the drive sprocket on the crank (they do drive off the crank don't they?) might be a problem with the 2.0 block. Just my $0.02.

 

To calculate the compression ratio;
b = cylinder bore (diameter)
s = piston stroke length
Vc = volume of the combustion chamber (including head gasket). This is the minimum volume of the space into which the fuel and air is compressed prior to ignition. Because of the complex shape of this space, it usually is measured directly rather than calculated.

CR = (p/4 × b2 × s + Vc) / Vc



Due to pinging the CR in a petrol or gas (LPG or CNG)-fueled engine will usually not be much higher than 10:1. In engines with a ping sensor and an electronic control unit, the CR can be as high as 12.5:1 (2005 Audi A6 3.2)
In a turbo charged or super charged engine the CR will be around 8.5:1
In a diesel engine the CR will be 20:1 and higher.

I would think you could reuse the parts cuz its def. possible but using the stock would be kinda redundant since you would be turning the 420 into basically the same motor as the 2.4. the stroke is diff , volumetric capacity of surface of pistons are diff., where as top end is a lot diff. If it were me id just keep the 420a and upgrade all tested parts for more horsepower rather then try to build one unless I had a machine shop, a lotta time, and a lotta money. Or just drop a bloody SRT-4 motor in my 1g neon.

 

The Neon's rod length-to-stroke ratio is already at the bottom end of the accepted range for performance engines. Stroking it would increase peak piston speed, acceleration and deceleration rates, put much more stress on the cylinder walls, skirts, rings, and rods, reduce safe rpm limit... A long rod kit makes much more sense.

No, the blocks are not the same. And the crank, pistons, rods, and bearings are not interchangeable.

The heads from the older 2.4L's (Caravan, early Stratus) are the exact same as the Neon DOHC (Dodge's D4RE, not Mitsubishi's 420A, which never was an option in a Neon), same casting numbers, same part number.

Best of luck!

 

Yeah what radar said...parts arent interchangeable as the litre size is diff, and arm length you would have to get diff crank all together, and diff. connecting rods. Like i said its possible but really not worth it. My friend pulled the 2.4 and put it in his neon. It has def diff feel to it.

 

You can stroke it, but you are gonna need the right parts, modern performance and howell both sell them

 

Thanks guys. The project is on an extremely tight budget, like cashing in my drawer of quarters tight, and the available aftermarket stroker kits are quite beyond my pricerange. I will most likely end up sending the stock crank out for balancing, polishing, knife edging etc... and going with replacement rods and oversized higher compression pistons, does anyone have any input on increasing the bore size...? whats size works best, how far can you go and still maintain safe temps etc...? already aquired a Gude racing head package with port and polish, cams, stainless valves, 5-way grind, decked etc. and am in the process of increasing the bore of and polishing on the the throttle body and runners. Just would be happy if this is the last time i have to have half the car in my basement and half the car in my garage for a while. Help is always appreciated.

Cheers-
B4S