Chevrolet 235 12 Port Head

Well, you have to think that back in the early 1930's when these engines and other similar manufactorers were developing them, that engines in general were a new concept in the industry. [/quote]

Bullshit.

The 4Valve per Cylinder Offy was a Development off a Late 1800's Peugeot GP Racer Design.

They knew what worked long time ago...

 

I agree, but it also was a "purpose built" racing engine. Im speaking of the "Big 3", and why they didn't seem to be making the developments in areas we take for granted today to obtain more power with (1) port for each intake and exhaust and other things. And obviously, several specialty companies of the time seemed to be ahead of the curve, like Deusenburg, Cord, Bugatti and others of that same genre. I don't know why it took Ford until 1954 with the Y-Block to finally get away from the siamese exhaust ports. Chevrolet was still using that siamese concept with the 235 as well, until 1955 with the birth of the V-8.

 

The Peugeot 16Valve Twin Overhead Cam 4inline, was state of the art, of its time.
And with development it lived on with the Millers/Offy's into the '70s.

A 4 valve per cylinder is now accepted practice for modern efficient production engines, so saying siamesing Ports has an advantage doesnt seem to make a lot of sense to me.

Some Production Engines that were sold in new Cars, were Sidevalve ( flathead ) at least into the '50s, and with Siamesed Ports at least into the '70s.
So saying the manufacturers didn't know any better doesn't make any sense either.

These things were done for only one reason...

Cutting Costs.

 

"Late 1800's Peugeot GP Racer Design"???

Late 1800s, like 1910?
That's like saying WW2 was late 1920s.

 

Without looking it up, I think it Ran at Indy in 1913.

And in Europe earlyer than that.

Something like 1898 or '99...

But anyway, call it turn of the Century....

 

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<= Here's my crossflow Ford 300 powered altered.

9.0 @ 147

 

Uh...

No.

It was 1910.

 

Who gives a shit?

 

Let me guess: you're 15?

 

It just gets fustrating when people can't stay on topic.

 

Allright.

I stand corrected.

The point I was trying to make was, Give the Car builders some credit.
They knew how to do it right, pretty early on.

Peugeot was just a convenient example.
They built the 16V, then they built Pushrod 8V 4cyls with all 4 intakes siamesed, and some time ago they went back to 16V 4cyls.

Its not like they forgot to do it when they sold those in the '50s, so there must have been another reason.

I know about the Siamesed Intake Peugeots ( 403 ) because I knew a guy who De-Siamesed them.
And he found an enormous amount of Extra Torque with that modification.

Which is the same I've heard from the 8Port heads for Cooper S racers, and the ( American ) PBS Heads for Abarth's

So I'm convinced that Siamsed Ports are basicly crap, but some Engines can be made to run pretty good despite having them...

 

hEy inliners. A progress with the toytoa land cruiser head?

very interested. Since i read the wayne 12 port head story in Inliners international.

I am curiuos as to how it went, going, gone?

Thanks,

noel.

 

I got one and looked it over. The bore spacing is all wrong. even with an adapter plate I dont see how it would work. To bad its so close and would definitly breath better.

 

hi let me know how things are going would love to run in my essex coupe. six in a row makes her go

 

that is a no go.