SBC Weiand 144 blower

[econo racer]

If my 400 SBC makes 6 pounds of boost maxed out with the smallest pulley, Has 3.75 stroke. How much boost will it make on my 283? It has a 3 inch stroke.

[F-BIRD'88]

It will make more boost if the 283 itself processes less air in and out at x rpm. VS the 400.
Boost is a measure of backpressure in the intake.
If engine B consumes less air than engine A does
The blower boost will be higher on engine B
at the same blower drive ratio and engine rpm.

[F-BIRD'88]

A 144 does sick things to a built 283.
Be prepared to go fast.

One either engine, horsepower will top out at about 480 bhp on premium pump gas without intercooling.
Of course the 400 will make more torque output.
The 283 (if hotrodded accordingly) will be no slouch.

[econo racer]

The 400 has ran 7.0 in the 1/8th mile. Weight is #3600.

[F-BIRD'88]

MPH in ⅛mi. Fuel used.?

[F-BIRD'88]

If you ran a 144 on a better intake manifold you will do better.. It is what it is.
If you use a cog belt drive you can do a bit better.
No belt slip.

Whats the blower pulley drive ratio on the 400 now?

[econo racer]

The 400 ran on 91 or 92 pump gas. It has deep dish KB hypers in it with 64 cc heads on top. Sorry i don't know what size the bottom pulley is. The 283 is now a 302. 4 inch bore now. Has small journal bottom end. It has large dome pistons, 12 1/2 compression with 64 cc head. Both will have E85 futures. The mph was about 100 or 99.5.

[F-BIRD'88]

The bottom pulley will be either a 6" pulley (stock in kit)
or the available 7" pulley..
The boost guage reading on the 283 will be higher
than on the 400. Especially if the heads, exhaust and cam are smaller...

If used the 6 rib pulley belt set at higher ratios it was likely slipping at least a bit,. so...

I suggest Methanol fuel.. Roots blowers love methanol.
If the deep dish 400 kb pistons were the 30cc dish the CR was 8.7:1 with 64cc heads.

[F-BIRD'88]

As long as you don't mind using a 1.94" intake valve in the heads VS 2.02". a hot rodded low cost 305 cid sbc will work just as well to play with the 144 blowers.
It will rev just as high .
Thats methanol, ethanol and nitrous and boost just as good.
Much lower cost.

[econo racer]

It will run on E85 only. If all goes well the 283 will get 202=160 world product heads. there 64 cc heads and 200 int. Also a 125 Nos kit will go atop. It will run high 6/s one way or . With the 4 inch bore there will be plenty of room for the valves. I have some solid cams and hydraulic to pick from.

[PackardV8]

The 283 is now a 302. 4 inch bore now. Has small journal bottom end.

Be a bit cautious before getting too frisky with blower boost on a 12:1 compression in a .125" overbore. I'd definitely do a sonic test, as that's a sixty-year-old block with unknown internal care over those years.

BTDT - a while back we had finished boring one bank and on the second side, a hole opened in one cylinder at .080". We couldn't determine if it was due to internal corrosion or a piece of included trash, but time with a sonic tester would have been well spent.

[F-BIRD'88]

If building a 283 I would just bore it .030" or .040"
or .060" if needed. max.
Call it what ever you want..
Put the bigger 177 blower on it and even on pump gas
(low cr) you will exceed the power and net perf of all the foolin with a 144.
It will only pump so much air. efficiently.

[PackardV8]

Just asking those with first-hand experience, given the advancements of the Eaton superchargers, would you buy a Weiand 144 or 177 today?

jack vines

[F-BIRD'88]

The Eaton blowers are a lit more efficiant design.
If going EFI you can make a ton of intercooled power with the various Size choices of the Eaton Superchargers.. 2600 etc But they are not cheap.

The Lil 122HH Edelbrock E-Force single 4 bbl 122 cid blower is better than a 144 .
Just right for 500±. bhp .The Weiand 177 makes a bit more power ultimatly when driven hard.

The 122 E Force when driven hard(er) gets close.
With optional pulley choices.
That bypass valve is apparantly a bit delicate.

Go easy on it.

The 144 does sick things to small cid V8's. with a cam
and worked on heads. Its a lit of fun .. By the time you upgrade to the 10 rib belt pulleys etc for more boost and power, better belt function than 6 rib.. you might as well get the 177.
For 500+ hp get the 177.

[econo racer]

I have a fresh set of 307 small valve heads with 74 cc chamber. I think it would lose power verses the 202-160 heads with 64 cc chambers. Just thinking
though.