this is a dumb qustion, but it just hit me that a lot of the neon guys actually prefer the SOHC version of the engine for various reason (mainly the torque and power curve for daily race..errr...driving). so heres my question: what would be involved in converting the stock 420a eclipse engine into its SOHC counterpart?

heres a thread in relation to this question, and it seems pretty simple, at least for the neon guys (ehhem, i now own a neon, BTW, lol), so i cant imagine that its any more complicated for us. (edit: when i say "us", im still refering to the fact that im an eclipse owner...its a bit hard to give that up, lol)

http://www.neons.org/forums/viewtopic.php?t=127035

any input?

:shhh: i do cocaine :/shhh:

You would have to get a new computer made for it. You might as well swap in the whole motor and wiring and computer from the neon. It would be easier that way.

actually, according to that post you wouldnt. it is stated that the DOHC computer would run the SOHC fine. after all, we arent talking about a full engine swap here.

:shhh: i do cocaine :/shhh:

I'd like to see a dyno plot of the SOHC Neon vs the DOHC Neon vs Eclipse.

But if you did want to bolt it up the exhaust and intake would be on opposite sides and rigging up the timing belt would be a real pain. The Neon guys can probably just use the tming belt setup from the SOHC but our engine mount location is diffrent and may not allow you to use the SOHC timing setup.

But in general DOHC heads flow better than SOHC heads. But the SOHC heads have less rotating mass. Why not just get a new set of cams.

-J

no point in it that would make exhast rear exit in the engine bay meaning alot of cutting....

Bill

You can have it cheap, fast or good. Pick any two.

If you want it cheap and fast, it's not going to be good.
If you want it cheap and good, it's not going to be fast.
If you want it good and fast, it's not going to be cheap.

^^^ya, thats what i was looking for. i didnt *think* it would require too much work to switch the intake/exhast around, but i guess i was wrong, lol.

anywho, just another crazy idea down the drain

:shhh: i do cocaine :/shhh:

you could use the dohc ecu, in fact alot of sohc neon owners switch over to the dohc ecu for a performance gain. Are the intake ports and exhaust ports shaped differently? Couldn't you just get a cam that switches the time the valves open to make the exhaust the intake and the intake the exhaust?

easier to buy a neon head...

cause of the sensor on the cams

it could be done i dont see a point to it...

Bill

You can have it cheap, fast or good. Pick any two.

If you want it cheap and fast, it's not going to be good.
If you want it cheap and good, it's not going to be fast.
If you want it good and fast, it's not going to be cheap.

yeh I'd think you'd need to get some special cams so it would open the valves at the correct time if you'd want the head to flow in the direction ours is. But then again the head was made to flow the other way so maybe that'd be a bad idea.

one thing I like about sohc is that its easier to work on, like change timing belt and all that other head stuff. so simple maybe you could run it the way the neon is running it, isn't the head a lot skinnier than the dohc one? not sure O_o

http://www.hadesomega.info -car specz and movies 95 Eclipse RS | 76' 280Z | 89' MR2 | 99 Neon | 91 Zephyr
Who sez FF can't drift?

>easier to buy a neon head...
>
>cause of the sensor on the cams
>
>it could be done i dont see a point to it...
>
>Bill

its easier / cheaper just to buy a sohc neon

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