B&M supercharger (Page 5/6)
coolink13 OCT 09, 04:28 PM
I am very interested in this topic. Thanks for posting. I will be following your progress and information.
cmechmann OCT 10, 08:45 PM
Forgive me that I have not read all of the replies. However. There is a lot of aftermarket stuff for 60 degree Chevy engines. But that I know of there was only one stock turbo 2.8. That was the McLaren edition Grand prix 1989-90. And with that, the hp rating was only up to 205. That was also the aluminum head DIS engines. With not much more increase in weight you could put in a stock Series II n/a 3800 with wiring and ECM. Then you would end up with the same horse power with more torque without having it boosted.
Though you could beef up the internals of the 2.8 to take boost, you still have to deal with getting everything tuned in to get it right. I have used 2.8 stock, Series 1 3800 SC, Series II 3800SC and Series II 3800n/a. The Series II 3800n/a has been the most dependable. Not 1 hickup in the last 40,000 miles.
Coolkoolpyle OCT 10, 09:38 PM
Actually

Turbos are not used in top fuel
and
most likely never will be

The potential is certainly there
but

The intake well is far too big

Super unsafe.

Nitromethane is old school rocket fuel.
Got us to the moon
.

The length of intake tract would store so much potentially explosive gasses that a hiccup could be a big boom.

The superchargers are mounted on top and fuel is mixid as it passes thru.
It passes through a intercooler and then into the manifold.

The physical volume of pressurized and mixed fuel and air is fairly small

However with a turbo the fuel will be required to be injected far enough down the system to achieve a consistent mixture before combustion.

This has not been done while maintaining a save volume of combustion charge.

Top fuel is in the 5000hp range


Look at it this way

To make that much power you must burn enough fuel to support it
With the cubic inches they can run if a cylinder miss fires several times in a row it will be holding so much fuel it will hydraulically lock up and the engine explodes.

Violenlly

That much fuel must be evenly and we'll mixed with the air or it will not fire properly

It's not that turbos wouldn't have a definite competitive edge

It's that their just not safe to use in this way

It's already a big risk with a compressor

Gas
and
Alcohol don't have those problems so turbos are allowed


Do well too.
Coolkoolpyle OCT 10, 09:56 PM
I'm looking at these early heads

Combustion chambers are big
.not particularly well designed

I'm stuck with em because the supercharger kit has a early style manifold

Iron heads are my preference for street engines.

Bottom line

They blow headgaskets far less frequently

There's a issue with aluminum
It expands quicker
and more than iron

That means there is some movement between the two during warm up

It slowly erodes the gasket over time.

Don't like the metric valve stems

I ream them to std SBC size then install guide liners..

Bronze guides
Significantly less cost
REPLACE ME without having to re cut seats.

Beautiful invention.

I'm at the exhaust now
So I'm doing a little research as to how big a seat I can stuff in this casting
bowl hog the port to the seat and not hit water.

I'm currently waiting on delivery of a few castings to experiment on..

I'd like to give them 1.600 stainless exhaust

So

More coming on that subject

The spring pockets are nice and meaty
I'm going to have no trouble getting a nice set of double springs to fit with proper seat pressure.

When I settle on a part number and what I did to make them fit I'll post that too

With a supercharger

I'm not going to modify the intake size beyond what I have to for a SBC 1.700 intake valve

I got boost

Don't need flow
Need port velocity

Small valve delivers that.

Coolkoolpyle OCT 10, 10:00 PM
I'm looking at these early heads

Combustion chambers are big
.not particularly well designed

I'm stuck with em because the supercharger kit has a early style manifold

Iron heads are my preference for street engines.

Bottom line

They blow headgaskets far less frequently

There's a issue with aluminum
It expands quicker
and more than iron

That means there is some movement between the two during warm up

It slowly erodes the gasket over time.

Don't like the metric valve stems

I ream them to std SBC size then install guide liners..

Bronze guides
Significantly less cost
REPLACE ME without having to re cut seats.

Beautiful invention.

I'm at the exhaust now
So I'm doing a little research as to how big a seat I can stuff in this casting
bowl hog the port to the seat and not hit water.

I'm currently waiting on delivery of a few castings to experiment on..

I'd like to give them 1.600 stainless exhaust

So

More coming on that subject

The spring pockets are nice and meaty
I'm going to have no trouble getting a nice set of double springs to fit with proper seat pressure.

When I settle on a part number and what I did to make them fit I'll post that too

With a supercharger

I'm not going to modify the intake size beyond what I have to for a SBC 1.700 intake valve

I got boost

Don't need flow
Need port velocity

Small valve delivers that.

Coolkoolpyle OCT 10, 10:13 PM
Also

I'm using the holley sniper EFI

I hate to sound like a advertisement here
but...


Get one.

These things are by far the most practical and useful fuel system I've ever used

Computer asks some basic questions about the engine
and

It takes over

Self tuning and learning like nothing I've ever encountered..

Take it off and put it on a different engine and it relearns that one..

No longer is tuning a black magic art you can't really do without very expensive equipment and extensive computer and fuel system knowledge

Just plug and play

Computer will extract every pony it can while property maintaining a a acceptable fuel air ratio

It's literally the magic wand of fuel systems if you ask me.
Coolkoolpyle OCT 10, 10:53 PM
Johns4.9

Please post some pictures.
Johns 4.9 OCT 12, 11:52 AM
Looking forward to your build. This is a pic of mine.
Cheers,


Good morning Coolkoolpyle,

John
Will OCT 14, 09:13 AM

quote
Originally posted by DimeMachine:

I wouldn't SC a 2.8 fiero. I have seen more 2.8's spin rod bearings for no good reason through the decades. I have had 2 of them in my life and heard of plenty others. 3800SC is the ticket IMO.



The crankshaft oiling system changes that made it into Fieros for '88 fixed that. My original-engine Formula with 230,000 miles sees 6000 RPM every time I drive it.

[This message has been edited by Will (edited 10-14-2020).]

Coolkoolpyle OCT 14, 09:34 AM

quote
Originally posted by Johns 4.9:

Looking forward to your build. This is a pic of mine.
Cheers,


Good morning Coolkoolpyle,

John



What a thing of pure beauty!

The all aluminum V8 engine is exactly the direction I would take if I were doing a swap myself.

Too much weight in the back would undoubtedly create handling problems but this combo I would guess is absolutely thrilling to drive.

What were some of the difficulties installing this engine into the chassis?

Do you have any pictures of body mods you made if any?

Very cool.