Head Games...

[illSHOyou]

Last week there was disscusion about porting a SHO cylinder head. I have removed the center communication in the SHO head for examples...













This should be increase flow with no determental affect to the cylinder head flow. Flow will probably be at a higher rpm. Stock cams may not be ideal for this extreme mod. Turbo cars would probably love it. I will add more to this later...

 

[1993MTXSHO]

agreed, that will probably hurt a n/a car but maybe help a FI car, that is most likely going to slow intake velocity on the n/a one at least.

 

[illSHOyou]

agreed, that will probably hurt a n/a car but maybe help a FI car, that is most likely going to slow intake velocity on the n/a one at least.

I am working on different snake designes to team with this. This head is begging for ITB's.

 

[illSHOyou]

Knifed Edge Snakes, this is the new communication point. More work can even be done in this area, but you get the point.

 

[SuperHO]

So, ummmm, are you ever gonna dyno test any of these "mods", or are you just hackin shit apart based solely on theory?

 

[Sho Amo]

this has been an idea of mine for awhile. only thing is now getting a new intake manifold design the same size as the port on the head.

 

[illSHOyou]

Different Shapes to the communication point...

 

[illSHOyou]

So, ummmm, are you ever gonna dyno test any of these "mods", or are you just hackin shit apart based solely on theory?

Well I'm broke, and I dont have anything better to do today...
Allows me to play with ideas. My SHO needs license, but I cant afford the sales tax, joys of being house broke... I tried selling intakes to people, which I currently have two to do, but I am waiting on sandblasting...

I am also just breaking even with the intakes. So unless I win the lottery soon, nothing is going to happen. I am supposed to do James SHO sometime this winter, that is the one getting dyno testing.

In the meantime its hopes and dreams...

 

[SHOmethewayhome]

do the divider in the snake and the devider in the head intake port touch when the snake is bolted to the head?

i've never had the pleasure of tearing into mine yet.

also, what are you using as far as removing your material from the head? what type of heads on your tooling?

 

[illSHOyou]

do the divider in the snake and the devider in the head intake port touch when the snake is bolted to the head?

i've never had the pleasure of tearing into mine yet.

also, what are you using as far as removing your material from the head? what type of heads on your tooling?

Well, I deleted the center part in the head. My tooling is grinders and routers. You can put the communication anywhere you want really. You could move it 1.5" higher than it is there. Making the secondary port ultra short.

 

[SuperHO]

wouldn't that defeat the purpose?


Also...just random thoughts here.....




As the SHO intake and head design are super-effecient anyways, seeing as how a "normal" head porting job yeilds very little gains, what's the purpose to all this aside from creating what looks like more turbulence going into the head port? I mean, all that air's gonna stack up seeing as how I don't see any enlarged valves or more lift....unless a set of cams and oversized valves are in the works, which, considering you're broke, I don't see happening...

 

[Devin]

sf

Apples to oranges. You've seen head porting, and this is not quite the same beast. I have no idea if it could work properly, but this port not olnly enlargened the roundness of the ports but took out a big chunk of metal in the center, and eliminates the dual stage runner design.

I'm curious to see what happens with this.

 

[NovaSS]

Nice work but I think the results would not be what your goal is. SHOs are fast due to one thing. Its the intake. The rest of the engine is standard v/6 stuff.

In the old days ( 1970s) guys built engines for peak numbers, how much HP you could get at 6500 plus rpm. They did this with huge cams, giant ports you could stuff tennis balls in and over sized exhaust systems

The problem is the engine only spent fractional time at that RPM. Little concern was given to mid range torque .. were the engine spent most of it time. They were dogs , you had to ride the clutch just to get them moving

The SHO intake adress this, it gives good numbers from 4000 up. This is what allows this small engine to beat up on bigger power plants, the use of its very flat power band, it makes power EVERYWERE.


Your work may work on a high ( 10,000 rpm) engine with a single short runner, 12.5 CR and massive cam lift but on an engine using the basic dual runner design I think there are better aproaches to this.


If I were in you shoes( you have great fab skills) I would work on building a better flowing DUAL stage intake and leave the runners seperate.

 

[illSHOyou]

wouldn't that defeat the purpose?


Also...just random thoughts here.....




As the SHO intake and head design are super-effecient anyways, seeing as how a "normal" head porting job yeilds very little gains, what's the purpose to all this aside from creating what looks like more turbulence going into the head port? I mean, all that air's gonna stack up seeing as how I don't see any enlarged valves or more lift....unless a set of cams and oversized valves are in the works, which, considering you're broke, I don't see happening...

I am simply trying ideas. How can I justifie big cams and valves with no data? I wouldn't touch those areas anyway. The stock cams are excellent, and the head works just fine. I can port all day long for free, and try ideas out. Head is certianly good stock, but cleaning up certainly wont hurt. Plus I will build my car to my specs. I don't ask why you did what you did to your car, and I really dont care for that matter.

Besides your passage above tells me you don't really know what your talking about anyway. The port should start large and reduce in size to accelerate the air. With the larger initial opening I am compressing more air. Never mind the purpose of the dual stage intake, it doesn't matter, and doesn't apply to my build because you don't even know my build, so stop thinking you do.

How many cylinder heads do you see with middle dividers? Not many...
The S2000 has a very remarkable head and it doesn't have a single divider...
Once again your probably thinking about the dual stage intake, toss that idea in the trash, it doesn't matter you still don't know my intentions...

Point is...I do alot of reading, live and breath car stuff. I am open minded to opinions and like sharing information openly. You may not allways agree with me, but your not required too. I base everything off examples around me, my own expereince, and things I read....

 

[Slo-Sho]

Have you ever seen another dual intake runner engine w/o the divider in the head? Removing the bridge effectively shortens the runner lengths by about an inch while adding a lot more port volume. I'm quite curious how this modification will affect an n/a motor...

 

[MerkXRTurbo]

A N/A or boosted engine shouldn't matter. Airflow is airflow, and you want a perfect balance of flow and velocity in both cases. If this mod works well for F/I, then it will work well for N/A as well.

 

[illSHOyou]

A N/A or boosted engine shouldn't matter. Airflow is airflow, and you want a perfect balance of flow and velocity in both cases. If this mod works well for F/I, then it will work well for N/A as well.

I just picked up my real heads yesterday. Milled down .010, 3 angle valve job. Most likely I am going to use the port I created above. I just haven't decided for sure because it is a pretty extreme mod. I really think it will work well for force induction. The communication point is only moving up one inch, with a little extra volume at the top of the port. Apparently rumor has it other S/C SHO's have been doing this mod for some time....?

I will be twin turbo in the end, but my build will take years.

 

[AREA 91]

I give you props for trying something different.
IMHO you just lost your flat torque curve.
That will be slower than a stock SHO, without heavy supporting mods like cams, headers, etc...

 

[illSHOyou]

Superho, shut up...you couldn't even respond to me, so just shut up.

 

[SuperHO]

I didn't respond to you because I said my piece....why clutter up the board with sensless arguing when all you're gonna do is **** and moan about how no one thinks your ideas work?


I'll keep quiet from here on out, since apparently your broke ass shadetree mechanics is gonna work SO much better than highly trained, educated and paid engineers from Japan.


In the meantime, SHO parts are getting rare, so some of us would appreciate you stop cutting up perfectly good parts because your mental butt dyno says it MIGHT work.