Porting a type 4 head, Not much of a short side Options

[Shivers]

Because the port is almost straight, with little long side short side concerns, with what there is , do you find it necessary to slow the flow down on the “short side” to get good flow out of the valve. I was reading about something mepstein posted a picture of. Small divots, like a golf ball. So I’m going to do that on the long side, just wondering if there is any reason not to also do it on the short side. Thanks guy’s (IMG:style_emoticons/default/smile.gif)

[brant]

The GT classes in PCA were designed to run 110hp per a liter

Making the 6 cylinders more competitive at any displacement than a -4

But our redline was 7k and the type 4 can be made to do that easily

There is a really competitive guy out here with a 2.0
Great driver too
And redlines at 7500 rpm

[stownsen914]

The GT classes in PCA were designed to run 110hp per a liter

Making the 6 cylinders more competitive at any displacement than a -4

I believe PCA CR indexes aircooled 4's at 85 hp/L and 6's at 110. Edit - actually just checked, it's 90, not 85.


There was a fellow here on the east coast who ran a 914/4 in the GT classes a bunch of years ago, and did well against bigger cars. Usually outran them. Mostly his driving, to be fair. It can be done.

[brant]

The GT classes in PCA were designed to run 110hp per a liter

Making the 6 cylinders more competitive at any displacement than a -4

I believe PCA CR indexes aircooled 4's at 85 hp/L and 6's at 110. Edit - actually just checked, it's 90, not 85.


There was a fellow here on the east coast who ran a 914/4 in the GT classes a bunch of years ago, and did well against bigger cars. Usually outran them. Mostly his driving, to be fair. It can be done.

My memory tricked me again

So 180 hp 2L/4

At least 220 in a 2.0/6 has been done
Don’t know of any 180hp 2.0 fours out in the world

[Charles Freeborn]

The GT classes in PCA were designed to run 110hp per a liter

Making the 6 cylinders more competitive at any displacement than a -4

I believe PCA CR indexes aircooled 4's at 85 hp/L and 6's at 110. Edit - actually just checked, it's 90, not 85.


There was a fellow here on the east coast who ran a 914/4 in the GT classes a bunch of years ago, and did well against bigger cars. Usually outran them. Mostly his driving, to be fair. It can be done.

My memory tricked me again

So 180 hp 2L/4

At least 220 in a 2.0/6 has been done
Don’t know of any 180hp 2.0 fours out in the world

Seems optomistic to me too in NA trim.