|
|
Joined: Mar 2005
Posts: 219 Likes: 3
Contributor
|
Contributor
Joined: Mar 2005
Posts: 219 Likes: 3 |
In an "Accessory Trial" in the March 1952 Motor Trend, Griff Borgeson reported that the Rajo head increased the horsepower from stock 80.8 to 101.1. - do lump ports give a 25% increase? It had just the additional carb which could be adjusted to come in at any speed. Price $169.50
Will
|
|
|
|
Joined: Sep 2008
Posts: 3,669 Likes: 42
1000 Post Club
|
1000 Post Club
Joined: Sep 2008
Posts: 3,669 Likes: 42 |
If your meaning the bolt-in style lumps, then yes, we measured a considerable amount more than 25% HP gain with them in the later siamese heads, when compared to a stock small valve head w/o lumps vs. a large valve head w/lumps, both heads being large chambers. There might be some gain with the older heads trying to put lumps in them, but you have the limitation of still having a small port opening.
Class III CNC Machinist/Programmer
|
|
|
|
Joined: Sep 2001
Posts: 510
Major Contributor
|
Major Contributor
Joined: Sep 2001
Posts: 510 |
i am interested in whether "lumps" can significantly improve flow, horsepower, and torque in a GMC 302 or 270-H head. Those ports should be large enough to establish a difference . . . or not.
God's Peace to you.
d Inliner #1450
|
|
|
|
Joined: Apr 2007
Posts: 92
Active BB Member
|
Active BB Member
Joined: Apr 2007
Posts: 92 |
The Siamese branch in the older head is very much “T” shaped and quite different from the “V” in the later head and the builders helping me didn’t think a lump would provide any benefit there and that altering the short side turn radius to resemble that which is on the lumps would be best. They did however suggest a “turtle” on the back wall might be something the flow bench will like. On Saturday I plowed in from the top of a head and milled a NPTF dryseal pipe thread and would give it about a 70% chance of sealing as is. Drilling the holes and then a bit of brazing on the inside lip of the hole to increase the thread surface a few turns before milling should put that at 100% so a Rajo type conversion looks pretty easily doable.
1952 Chev 1300 Cdn. ˝ ton
|
|
|
|
Joined: Jun 2007
Posts: 1,411
1000 Post Club
|
1000 Post Club
Joined: Jun 2007
Posts: 1,411 |
With the welding processes out there now, would it be unreasonable to make and weld in a lump or splitter to make more of a "V" than the "T" that is stock?
I figured that would be one of the primary benefit of that mod; the other being a more or less straight shot at the valves.
My, what a steep learning curve. Erik II#5155
|
|
|
|
Joined: Oct 2007
Posts: 5,015 Likes: 47
1000 Post Club
|
1000 Post Club
Joined: Oct 2007
Posts: 5,015 Likes: 47 |
Do we know who got this head? Curt keep us up on how you are doing on your head. Beater
"I wonder if God created man because he was disappointed in the monkey?" Mark Twain
|
|
|
|
Joined: Jun 2006
Posts: 47
Active BB Member
|
Active BB Member
Joined: Jun 2006
Posts: 47 |
One more reason to make the 2010 Inliners Convention in Boerne (Bernie) Texas in June. Mr. Palmini will be there along with his scrapbook and pictures of his modified head, with which he drilled some serious bent motors back in the day. Mr Palmini is a gentleman of the first order and I believe he will give a short dissertation that will enlighten us all. He also owned Spalding Cams prior to selling the Company to Mr. Ed Iskenderian. Most interesting man. I'm sure there's more to the story. SOB
Bill Mulholland (SOB)
|
|
|
|
Joined: Oct 2007
Posts: 5,015 Likes: 47
1000 Post Club
|
1000 Post Club
Joined: Oct 2007
Posts: 5,015 Likes: 47 |
SOB, Is there a chance that the "dissertation" could be videoed? It would be great to have this kind of information available on this site. I would like to get to the convention but right now I don't think it will happen. I hope someone will do an indeph interview of MR. Palmini for the 12 Port News. Beater
"I wonder if God created man because he was disappointed in the monkey?" Mark Twain
|
|
|
|
Joined: May 2005
Posts: 596
Major Contributor
|
Major Contributor
Joined: May 2005
Posts: 596 |
Bill I also think it would be fantastic if the tech talks could be put on tape, as I won't be able to make it to Texas this year. I have a previous planed weekend in Colorado the same dates. I will miss seeing everyone but can't be in two places at the same time.
Been there, Done that, Hope to live long enough to do it again. Big Bill I.I.# 4698
|
|
|
0 members (),
193
guests, and
47
robots. |
Key:
Admin,
Global Mod,
Mod
|
|
|
|
|