Retrofit blower

I understand that a retro blower needs to be set back on the intake to seal
the front discharge pocket. Wouldn`t it be even better to center the front
delta more in the middle of the manifold to improve mixture distribution?

Any help would be appreciated

BJ

 

retro

I have seen it done if you look close at some top furl and top alk rigs they are doing that and running a long snout with a brace on the snout

 

Do you mean class rules or rules of thumb?

 

Retro blower

@ Mike,

to be more precise, i have bought a Littlefield 14-71 HH retro and I`am in the
process to reweld my intake to avoid using the flimsy retrofit adapter.
As we have no regulations here in Germany about how far a blower is allowed
to be set back, i`am free to set it back more than just seal it to the intake if that would be an advantage.
You stated that the air stream out of the blower outlet will point in an 45° angle to the front of the intake; does that mean it is reflected from the intake
inner front wall to the back?
Will the mixture (air) distribution be similar or equal to a conventional
(fully open) bottom opening?

thank you

BJ

 

As I understand yoy are allowed a 15" setback from the front of your pulley to the front of your rotor. It gets the blower right at the # 4 cylinder opening. It does help the engine breathe more equally as your nozzles will show. But if you bring the blower more back brace the blower manifold and be prepared for a very high cost snout.

 

So whats the best rule of thumb for the delta mouth style retro?? We are having this discussion right now on mine. Is one inch back enough over standard or should we back it up?

 

set back

we run ours at three inches back . you still need to even up the cyls. with your port nozzels.

 

I have no data other than real world what my eyes see data. We run a retro 6-71 front discharge, standard helix, in the stock location. Engine is a KB Olds on alky in a nostalgia funny car. We run 6 hat nozzles and 2 in the rear of the blower case. NO port nozzles. We run 6.90's at 41% over and the spark plugs are burning remakably equal. No data acquisition to verify EGT's, just a happy motor. Just my .02 cents.

Keith

 

What kind of intake and heads?

 

Merlin steel 345cfm heads, un-molested and a Miersch (sp?) intake (tall)

Keith

 

Retro Blower

OK, reworked my intake to set the blower back 3 inches; looks as one can`t
really improve mixture distribution on a "conventional" blower intake setting
the blower back any further.

I had used the following port jets (Enderle) with my 10-71 std. helix big bottom opening with decent temperature differences from front to rear:

1 44 2 46
3 42 4 42
5 40 6 40
7 38 8 38

will the the temperature distribution be similar with my new 14-71 HH retro
set back 3 inches? (would prefer using the same total port jet area)

thank you

BJ