Well, after alot of discussion with myself and others, I decided to go ahead with relieveing my C2AE block along with some other mods for this blower application. I didn't have a piston that was a good fit for the bores, so I made a template out of a hardwood block for a guide while using the carbide cutter. I think it worked out pretty well. I also drilled out the hole for the early style road draft tube using a 1&1/4" carbide tipped hole saw, removed the ridges and polished the center 3 main webs and ground off the casting marks and polished the area around the distributor hole for easy cleaning. I'm on a roll now

 

 

Rono

  Ron Lane,  Meridian, ID

The straight slots are there to help direct the compressed air/fuel mixture towards the spark plugs from the quench area.  These are typically used as a detonation deterrent.

Lorena, Texas (South of Waco)

What about those slots running from side to side (top to bottom in the picture)? Do they help accelerate the mixture toward the plug?


Lawrenceville, GA

Doug.  Those radial slots are valve reliefs.  Here’s another picture that’s not blown up so much.

 

Lorena, Texas (South of Waco)

Sounds great! I need to get up to Billy's place anyway he has some bumpers for me. We'll have to pick a weekend when the snows not blowing. I'm available almost anytime. Lets set it up! Bills the one that keeps traveling. Chuck

Y's guys rule!
Looking for McCullouch VS57 brackets and parts. Also looking for 28 Chrysler series 72 parts. And early Hemi parts.

MoonShadow, 292 w/McCulloch, 28 Chrysler Roadster, 354 Hemi)
Manchester, New Hampshire

It's called the Ricardo combustion chamber after Harry Ricardo. It is a design that promotes high turbulence in the chamber. He designed this type of combustion chamber in the early 1900's so it is not unique to the Y-Block.

"The Master Cylinder"

Enjoying life at the beach in SOCAL

I remember cartoid or carotid or something like that. It was the design of the 239 chamber and it does have visual similarities to modern combustion chambers. I think it's in the Eikmann book. But then they changed it. They definitely got something right because they produce excellent specific torque output.


Lawrenceville, GA

Hey Chuck;

You, me and Y Block Billy will need to hook up next summer. We are all within a couple of hundred miles of eachother. I'd like to check out your McCulloch set-up too.

Rono

  Ron Lane,  Meridian, ID

Waiting for Ted to post his 2cents. My memory wont allow me to recall the specifics but wasn't the design of the Y-Block chambers supposed to be way ahead of the competition? I've heard a name for the type of design but it must be in offline storage! Chuck

Y's guys rule!
Looking for McCullouch VS57 brackets and parts. Also looking for 28 Chrysler series 72 parts. And early Hemi parts.

MoonShadow, 292 w/McCulloch, 28 Chrysler Roadster, 354 Hemi)
Manchester, New Hampshire

I think you do gain better flow with the reliefs, and if you plan for it you can make up for loss of compression in shaving the heads.



You could also simulate this with a bench flow and test which results are better.

Heber City, UT (15 mins outside of Park City- basically it's in the mountains)

55 Effie