SOHC neon head on 89 2.5 cb

[tkelly27]

http://www.indyheads.com/indyneon/index.php
Indy can get decent flow out of the SOHC's. I realize those are CNC ported etc. etc., but I think a stock SOHC is a step up from the 8V head, and if it fits on easier than the DOHC then so be it. DOHC advantages, flows somewhat better (I was reading at neon forums, they are always fighting over SOHC vs. DOHC), many more cams available, adjustability of cam gears, and I guess theres more performance suppourt for DOHC. Oh yeah, my dad says a DOHC setup is more efficiant since the frictional losses are minimized by having the camshaft directly operate the valve instead of having cam followers. I say, if you've got a SOHC, strap it on and go, it will most likely be faster than an 8V and you will already have a vast majority of the fabrication done for a 16V (I think the ports and stuff are the same style, someone else can probably help there)

[The Pope]

Quote:

Originally Posted by tkelly27 Oh yeah, my dad says a DOHC setup is more efficiant since the frictional losses are minimized by having the camshaft directly operate the valve instead of having cam followers. I say, if you've got a SOHC, strap it on and go, it will most likely be faster than an 8V and you will already have a vast majority of the fabrication done for a 16V (I think the ports and stuff are the same style, someone else can probably help there)

out of the 3 DOHC 16v heads we see the Neon and the Lotus head both use rockers. The Masi/cosworth head is a hat on valve type and they bend valves.

The 16v SOHC head is nothing like the 8v SOHC head, none of the manifolds fit at all. The SOHC needs all the same mods as a DOHC to install it to the block. The hybrid people however can buy studs, gaskets, wires, pulleys and a timing belt for a hybrid with a DOHC. No one is selling stuff to swap on a SOHC so now your hunting for custom parts. The DOHC head stock came with a turbo, old round exhaust and newer square exhaust, bolt on factory stuff.

For the amount of work it takes to get this done there is no reason not to go with the better head. Unless power isn't why your doing this swap, or maybe you have a completely built SOHC Neon top end and blew up the Neon short block. Then you would have it already laying around.

[The Pope]

Quote:

Originally Posted by glhsdrew isn;t the intake and exaust on the same side as the dohc from the sohc

the exhaust on a 8v is the same as a SOHC in a mini or a Neon. The Mopar DOHC has the exhaust in the same spot in the back to, but the Mitsu DOHC has the ports swapped and they are in the front of the engine. All 16v Mopar heads are cross flow with a manifold on each side of the head.

[ourturbovan]

Quote:

Originally Posted by The Pope out of the 3 DOHC 16v heads we see the Neon and the Lotus head both use rockers. The Masi/cosworth head is a hat on valve type and they bend valves. The 16v SOHC head is nothing like the 8v SOHC head, none of the manifolds fit at all. The SOHC needs all the same mods as a DOHC to install it to the block. The hybrid people however can buy studs, gaskets, wires, pulleys and a timing belt for a hybrid with a DOHC. No one is selling stuff to swap on a SOHC so now your hunting for custom parts. The DOHC head stock came with a turbo, old round exhaust and newer square exhaust, bolt on factory stuff. For the amount of work it takes to get this done there is no reason not to go with the better head. Unless power isn't why your doing this swap, or maybe you have a completely built SOHC Neon top end and blew up the Neon short block. Then you would have it already laying around.

perfect, just what I was looking for.

[Koreth]

Quote:

Originally Posted by The Pope out of the 3 DOHC 16v heads we see the Neon and the Lotus head both use rockers. The Masi/cosworth head is a hat on valve type and they bend valves. The 16v SOHC head is nothing like the 8v SOHC head, none of the manifolds fit at all. The SOHC needs all the same mods as a DOHC to install it to the block. The hybrid people however can buy studs, gaskets, wires, pulleys and a timing belt for a hybrid with a DOHC. No one is selling stuff to swap on a SOHC so now your hunting for custom parts. The DOHC head stock came with a turbo, old round exhaust and newer square exhaust, bolt on factory stuff. For the amount of work it takes to get this done there is no reason not to go with the better head. Unless power isn't why your doing this swap, or maybe you have a completely built SOHC Neon top end and blew up the Neon short block. Then you would have it already laying around.

Do you have picures to back that up? This picture I seehere looks like it uses the DOHC head uses those hydraulic lash adjusters and followers like our 8 stock 8-valve heads. When you say rockers, I imagine something like the setups found on pushrod motors or the setup on the SOHC 3.0L heads.

[OmniGuy123]

Quote:

Originally Posted by Koreth Do you have picures to back that up? This picture I seehere looks like it uses the DOHC head uses those hydraulic lash adjusters and followers like our 8 stock 8-valve heads. When you say rockers, I imagine something like the setups found on pushrod motors or the setup on the SOHC 3.0L heads.

I believe that he means followers when he says rockers. I use the term interchanably too.

[turbovanman]

Personally, if I have to spend $1585 on porting a SOHC, plus the costs of putting one on, I would rather have Steve M port my stock head and thus, save a ton of money and hassle,