420a motor build options??

[EclipticalGS]

Just picked up my 4th dsm today. Have a Gst, Gsx, GS and now another GS..all 2G's...I picked up the car for $1100 with a a knock in lower end.

Took car home home, oil pan had C-rod bearing pieces, connecting rod was bent, and a lifter was stuck....

So my question of the day, im new to 420a's i just got my first blue one (winter car) like 4 months ago or idk. Don't know my options,

Is there any type of rebuild for a 420a that i can use a different block, head and etc. Is the 420a the only motor with those mounts? ik im not saying i want a 4g63 in my GS but i wanna build it up. Is there any combinations i can do with a 420a?? or can i only use 420a components. Thanks. I already have eagle rods and JE pistons for the build too.
THanks.

 

[josh2ndgen]

You can use a 2.4L Chysler block with a 420a head but always get upgraded rods and pistons because they are very weak in both 420a and 2.4L.

 

[NeMiZiS]

Who says that they are weak?Have you ever owned a 420A?
A stock 420A bottom end can take an easy 8 psi, if it is in good shape.A built 420A can do a whole lot more than that.

 

[josh2ndgen]

Yes I used to have a Hahn turbo 420a and it was a piece of shit.

 

[rs-t eclipse]

It really depends on what you are planning on doing with the car. If you put forged rods and pistons in the 420A it can be just as strong as a 4g63 car with a turbo kit. Do not leave the car stock if you plan to turbo it. It can handle 8 psi... but not forever. I cracked many pistons in my 420A's before I learned that i needed forged internals to run boost all the time and i only ran 7psi. i think the 420A is a nice platform if you build it. sometimes i wish i had done that instead fo buying my 1g. if you leave it stock it can handle spray real nice i ran a 75 wet shot on mine for 2 years before i turboed my first car.

 

[NeMiZiS]

Two years of spraying a 75 shot? How often were you spraying it?..

 

[EclipticalGS]

i said i have eagle rods, and je pistons for the build...So i guess if i dont buy a 2.4 chrysler block then im kinda stuck with using the same block and head. So you think i should work on internals. I ahve eagle H-beam, and JE lower compression pistons. Since i dont wanna do a 2.4 type stroker build..what other internales should i get and can you lsit the names of the best youve had or heard of..I thinking of Cams, valves, would a new crank be a good idea??are there any aftermarket ones???...any other internals you think i can use...btw my freind runs 12 psi on his 420 with no build and hes been boosting for 3 years but he told me 420a's have a lot of potential if used right..he got me into this whole eclipse era..i used to be a beamer guy ..

What im getting at is should i do a 2.4 block build?? or cheaper jsut replace crank, cams, valves and etc.?
Thanks

 

[96TurboGS]

The 2.4 swap isnt a direct bolt on, some modification and various parts will be needed.

2GNT.com - 2.4L_Discussion_by_Skrilla

Look at various members profiles with 420a’s to get an idea of you will need for your set up. Your friend is lucky he hasn’t blown his engine yet, what size turbo does he have? T2,3? Its not necessary to change your crankshaft. If your going to put cams in you might want too upgrade the intake and get some goodies for the head...The bottom end is the only thing you need to worry about. Your on the right track, also look into the pt cruiser valves/rockers it will help in the higher rpms.

2GNT.com - Rockers

 

[rs-t eclipse]

I wasn't spraying all the time. It was $3.75 a lb back then thats 37.50 a bottle. but spraying is only straining your engine when its armed not all the time like a turbo. If your buddy is running 12 psi on stock internals he is either very lucky or babying the crap out of it. He well learn one day. Thouse pistons just can't handle it, mainly cause they just weren't made for boost. So its good that your starting with rods and pistons. i've heard that the stock crank is pretty strong i would only upgrade if your planning on going over 400 hp. I do not know how much they can handle. Cams are a good choice they well help your top end and help spool your turbo faster. i do know know which is best i never got that far with my 420 cars. would concentrate more on my fuel system though instead of cams if your going turbo. bigger injectors, fuel pump, fuel regulator, and a safc are going to get you more power then 500 doller cams with a turbo. I'm pretty sure 420's can't handle much more then 10 psi with stock injectors and thats if you have a fuel pump and a regulator. I would build the block and get some 450 injectors, safc, fuel pump, regulator, get it tuned right and you well have a solid 420a car

 

[96TurboGS]

i've heard that the stock crank is pretty strong i would only upgrade if your planning on going over 400 hp. I do not know how much they can handle.

As I said before it's still not necessary to upgrade the crank. Hahn's 500-600hp 420a and various neon guys have been using stock cranks for years. I will be over 400 very soon and I don't plan on using a forged crank unless i get somthin stupid like a gt42.

To the OP: If you have the Greddy EMS I would go ahead and install it and get it out the way...it will save you the headaches later on down the road.

 

[EclipticalGS]

ok thanks guys..
I guess ill jsut pull the motor..install the new connecting rods and rod bearings, with pistons after some serious honing on that head...replace the bad valve...and that is pretty much it right??? dont need a new crank, not really in need of top end cams...so is that it for bottom end and top end???

And buy "head" goodies what do you mean?

then jsut go for ordianry turbo set-up parts like a safc, fuel reg, fuel pump, and some injectors (buddy has his stock evo injectors will those work??) Then is the motor built enough after this???i mean just pistons and c-rods is a strong build??

Thanks

 

[viperlp01]

safc will not work for your car... YOu do not run a maf. Your are speed density.... YOu need megasquirt or some other standalone.... Evo injectors will work and support some power.

 

[96TurboGS]

safc will not work for your car... YOu do not run a maf. Your are speed density.... YOu need megasquirt or some other standalone.... Evo injectors will work and support some power.

Wrong, it does work. Ive gotten desired air/fuel ratios and so has many others. It doesn’t work with in relation with boost though, but as for modifying the map signal in the upper rpms and adjusting idle it works well. MSNS is in its own category...

To the OP: You have a Greddy E-Manage right? (looked at profile) Why would you want to use a safc? The Greddy E-Manage is a piggy back system, but a lot better than the safc. You can control injectors bigger then the 440’s, but I haven’t run across anyone using spark with it (for our cars).

 

[EclipticalGS]

my greddy ems is going to be hooked up soon. I got it from my brother. He said its got a lot of options and can change a lot of things. It will be played with soon.
As for the injectors, they are in, car runs really rich...

 

[Locke]

Don't use larger injectors until you have a means to control them.

Running rich won't net you power, but it can foul your cat, o2 sensor, and plugs, as well as lead to heavy carbon deposits in the combustion chamber which can lead to more devastating problems, like pre-ignition.