blower plate

Just pondering here......

Could a person make a plate that had a pie shape cut in it to make a standard blower thinks its a retro? or would it just no be possible?

If that did work would you have to set it back?
The blower I had the pondering moment about is not a front discharge would that matter?

again just something I was pondering while working at the firehouse on a beautiful holiday weekend.

 

Are you trying to do a "retro" or a "delta" bottom ?

 

No idea really but if I was thinking about it I would.

Start with a thick plate and mill in a riser to go into the large opening.
cut the pie.
machine it to take the rotors (if needed)

so basically I would think long about just using a plate with a pie opening

 

plate

I've seen blowers with large inlets and outlets and all kinds of plates bolted on to make them smaller like a modern blower case. Keep in mind that the big gains are from the larger sealing surfaces of the bores of the case. A plate bolted to the top is nothing like the contoured shoes that the promod blowers insert.
On the bottom,you might gain a little sliding the blower back but the delta outlet probably won't be worth the hassle.

 

No Pie............

The "plate" on a Hogans intake, isn't a delta opening, just a rectangle opening to the rear of the pie.
This is wrong?

Craig

 

I have seen this done many times with varying degrees of success but none worth the effort. Raises boost on the guage but in fact just heated the air.

The rotor angle difference pointed out by Mike is right on.

The V shapped insert from the top always pays of and is well worth the effort. It should be ^ shapped on top too.

 

Mike,

Value your input,
I have a 60* 14/71 with a pie opening.(not retro) When we purchased (good vibs) it we were told that it would make more boost than the full open style (but not that much more).

The price between the diffent 60* styles wasn't that great from memory.

Did we get a sales pitch?
Why do they make the pie in a 60* if it is no better?


Tyson

If the

 

i have a 14-71 littlefield with a pie opening and 60 degree rotors. When i sent it out last year to littlefield to have it restripped he said that they dont make them that way anymore.

 

Thanks Mike

Mike and everyone else,

Thanks for your input. I am just going to leave it alone and what it makes it makes.

As for the pie on a 60* rotor, I think you can get one from RBS I think its a Littlefield that I saw build like that Its black I thing..... Im going to check myself.

One more question..... What is the Delta opening?????

Thanks again all,
Bob

 

Not quite sure on this, my memory is a little sketchy,,,
I think the monster truck guys are limited to standard helix rotors and so they change the case.

Aren't the Top Fuel guys limited to standard rotors and the cases I've seen are reduced front openings.

 

just looked on rbs, There are some 60* blowers with pie shape openings, Some really small like you see with the new dpme's and littlefields, some big and long on the littlefields too. any idea what these are? Are they just older models or something new?


I for see alot of opinions weighing in here.

 

back in the 90's, whenever the rules called for a standard helix rotor, most of the guys ran a hi-helix case with a 60* rotor. this was pretty popular in the IHRA classes. super eliminator, pro outlaw, top dragster, top sportsman, etc. you could actually pick up quite a bit in performance by doing this because there wasn't alot of cutting edge r&d technology back then.
Darren

 

delta

A delta is a triangle shape. It's just a more technical way of saying pie shape.

 

In my opinion, to be optimum, the angle of the pie would be different from a high helix to a standard.

 

I'm definently no blower expert, but I was under the impression that more degrees contact between rotor and case was the whole idea behind the delta bottom and the smaller inlets and outlets.

If thats true, a 60 degree rotor would benifit from tricky plates and inserts..... just not like a 120 degree rotor.