SOHC 16v

[blue1]

Has anyone played seriously with the 16v sohc engine, i would sort of compare it to a 2G with the port sizes so with a little bit of work these might be ok too.

[Spyder4G64T]

The SOHC ports are much smaller than even the 2g ports. I measured them with a caliper once, but don't have the info handy. I'll see if I can find the info and post it here.

Still, if you're looking for brute force low end torque, wtih less on the top end, the SOHC head is the perfect choice. I've got a couple extras laying around I was going to play with (and still will one day). I know RPW has performance cams for them as well, so there is hope!

Curt Shambeau
96 Spyder GS (turbo'ed 4G64)
http://4g64.150m.com

[Spyder4G64T]

Ah ha! I went searching in the archives of the 4G64 yahoo message group (which is a very painful thing to do) and found the measurements:

The 4G64 SOHC ports are 44mm X 27mm in size.
The 4G63T DOHC ports are 55.5mm X 27.5mm.

As you can see, it's a fairly significant difference. However, there is work that could be done, and for low end power, nothing will touch the SOHC head.

[blue1]

i did do some searching myself and i think it was your home page that I found and it was good, i was chasing info whether the DOHC valves ,springs and that sort of stuff was interchangable. the ports to me are not a great issue i have access to some really good flow bench equipment and have been know to be handy with a die grinder (dremel) so i think that part is not a problem and cams i am in fairly tight with the owners of Crow Cams Aust so that is not a problem either.
i am building a 4G64 hybrid ( 1G head) at the moment for my new mini truck and was just curious what i can achieve with the old 4G64 SOHC for future projects (to good a motor to waste away sitting in the garage).
New motor:
4G64
Wiseco's
balanced, polished shotpeened crank
1G Rods, polished, shotpeened,bushed, ARP bolts
ARP main studs (line bored)
1G head (mild port work)
1mm O' size valves
262inlet, 272 ex cams
Ajt cam gears
Crower springs and Tit' retainers
HX35 holset with Bulls eye housing
ARP head studs
Cometic HP head gasket
1600cc Bosch injectors
water/meth injection
Wolfems standalone ECU
Fully operational cyclone manifold(ecu controlled)
Fmic 3" plumbing

Aim is big power between 3500 to 6800 (have to see what it does) will update my home page soon and will do step by step for this site as well. Thanks for your reply Paul.

[Spyder4G64T]

i did do some searching myself and i think it was your home page that I found and it was good, i was chasing info whether the DOHC valves ,springs and that sort of stuff was interchangable. the ports to me are not a great issue i have access to some really good flow bench equipment and have been know to be handy with a die grinder (dremel) so i think that part is not a problem and cams i am in fairly tight with the owners of Crow Cams Aust so that is not a problem either.

I know the valves are a different size, but not by much, but either way they are not interchangable. No clue on the springs. I can't say for sure, but I would guess not.

Aim is big power between 3500 to 6800 (have to see what it does) will update my home page soon and will do step by step for this site as well. Thanks for your reply Paul.

I would consider a 2G DOHC head for that power range, personally. It will flow better in the RPM range you're talking about, especially with your access to a flow bench for porting & testing.

Sounds like a fun project. Keep us updated!

Curt Shambeau
96 Spyder GS (turbo'ed 4G64)
http://4g64.150m.com

[blue1]

I would really like a head off an EVO IV to have the turbo on the other side away from the steering box ( Mine is a RHD, RWD minitruck) everything over here for the 4G stuff is quite expensive and hard to come by. The 1G head that i have for the 4G64 project (1G head) i was given and it wasn't in bad shape so i have had the 1mm o/s valves put in and we are trying a few different thing with the floor design of the inlet ports building it up with plasticine on the flowbench and also with the cyclone manifold.
I am just waiting for another cyclone manifold to come from over there as i think from what we can tell if we enlarge the plenum and taper it off a bit there will be some more gains there, because when the throttle body mounting was changed to the other end for the RWD i think we introduced some bad turbulence issues and dropped about 6 to 8 cfm at .450 valve open on the bench! so it will all take time and a bit of playing,
I have been flying all over Aust' with my job the last couple of months which has slow everything down but thats coming to an end soon, will keep you posted.

[jh2fast]

yeah way smaller ports

[blckdsmracing]

hey i need help i got a 91 n/t 4g63 i did an engien swap cause the other engine is blown and i put a beater engine in while im building my other engine. (confused yet??) well i got it running and i got an idol issue now whenever i start the car the throttle will just go up and down even when my foot is no where near the pedal. out of my research i have foudn it has something to do with the vacuume lines but all the lines r good. except one i can figure out where the connector in the middle goes so i put a screw in there and it didnt help. there is also a exhaust leak i dont know if there is any coralation between them. any help?? like an outline of the vacuume lines of where they go. i couldnt find one in my manual.

[blue1]

Probably better of putting this in another forum to do with 4g63 specific,

[Asmodeus]

If you need anything from the 2.4L SOHC 4G64 that's stateside (Typically in Galants here) I have extra's sitting around. I could easily measure things. I have a head sitting in my basement. If your into the RWD version LSR Mike would be of some use to you. He has a salt flat truck, thats he's been inside out of.

I also have 1g 2g parts out the "A" hole. BTW, 4G63 valves are NOT the same as the 4G64. Neither are the springs, neither in pressure or size.
Close tho.

Must be nice to be able to have computer controlled cyclone IM's ya know...
:rolleyes:

[blue1]

thanks for the info, and the difference with the computer controlled cyclone is awesome and i think will be a major asset with the 4g64/1g hybrid to get the HX35 to work well

[6G72POWA]

<-- worthless post

[LSR Mike]

When you get that truck done, com'on down and see if you can get my record

(see mighty max post in this forum)