pologreen1

I have been considering for a long time a 144-177 blower.

I called Holley a while back and they told me that the stock setup of a 177 kit on a 427 would make 5lbs of boost and be safe. I have a 434 so I'm sure it does not matter much but "maybe" it would help eat up more even since I have around 10.5+ compression with 75cc heads.

I understand they are basically rated by CI they add, which is relative to the physical size itself. I can't find the info stating the actual size of the blower to decide what would fit.

I seen an episode on Engine Masters a while back show casing these VS the Paxton etc...

I know in the past someone here had one a c4, but they specifically call out c4's as not being compatible with these.

Does anyone or has anyone seen or fit one of these and what size scoop is needed?

I have a carb and 4" scoop on my car now so I think the 144 might fit under the hood, but I wonder about a 177?

BOOT77

Some of the smaller blowers can only move so much air(max hp they support) and may actually choke your 434 depending how much power it makes atm.

hcbph

It's been a long time since I touched one and even then it was limited (as in other peoples cars). First thing to remember that a blower will effectively increase your compression ratio of your engine. I suspect that you'd want to drop your compression ratio to something like 8.5-9.5 before considering adding a blower. Additionally the blower should be sized to the engine as well as the pulleys.

One thing to consider, with this style of blower, you're going to have to open a hole in the hood which is why so many cars in the past simply removed the hoods of their cars.

Back then some had to add some form of water injection to help prevent detonation in the cylinders while blower pressure increased.

You need someone more knowledgeable than me to help you but I suspect it's going to be much more than just bolting on a blower.

Churchkey

With 10+ compression maybe consider a shot of Nitrous.

Never ran a small Weiand had a 671 on a 355 SBC in a lowboy deuce coupe. CR was 8.5 with "blower" pistons. 18% under drive = 10 lbs boost. Ran 104 race gas in it with a mag total timing @ 34*. Never melted any slugs but the car weighed 2800 & had 4.56 gearing. Custom 6 row radiator.

Interesting side effect, off throttle the engine would pull for a second or so using up the residual fuel in the blower.

IIRC my 90 Bird Super Coupe had a small Eaton with an intercooler. Had a valve that allowed the engine to run NA, full throttle = boost.

Maybe investigate a Latham axial flow it might fit under a Vette hood. Maybe side draft Webbers on it? IDK performance wise but it would look good.

Engine mount Paxton, build a pressure box for the carb like those used on blown 57 t birds, Assembled height should be similar to what you currently have.

Good luck

pologreen1

Holey said it can be done. Newer cars have higher comp and use superchargers.

Greg at blower works also thought it could take 5lbs or 7 if intercooled.

I wonder if the tuning is different or what.

BrianCunningham

It can be done, but yeah, for you 434 that will be way to small

I'd love to run a roots, but getting the cog drive to clear the frame requires a lot of mods

anesthes

177 is maxed out around 550hp, and it's efficiency is right around 60%.

Not a good idea.

-- Joe

pologreen1

alright, I'm out then.

Thanks for the info.

rklessdriver

I actually have a buddy with a little B&M roots for his 84. I think his is a 144. Everything fit under the stock hood. He ran it on the car for a long time but started having problems with the ancient 1980's Fuel Injection Unit. I don't know that he ever had it on the track but if felt pretty fast for an otherwise stock 84 with just the blower. Later on he put a set of the original TFS TW SBC heads and a cam in it but I think it only caused more problems with the B&M EFI set up and eventually he removed all that stuff and put a 2101 Performer intake and carb on it.

My dad had a B&M 174 on a 5 Liter Mercury Capri (fox body) back in the late 80's and early 90's. It had an upswept hat/carb adapter that held 2 Mikuni 44mm side drafts down beside the blower case.... You could also get it with Delortos or Webers from what I understand but for whatever reason ours came with Mikunis. That car was fast for the time. Ran mid 11's on regular street tires and the short block was dead stock. The top end was typical for the day with ported stock heads and a pretty mild Engle (EP22) cam. 3.73 gears and the stock T5 (which grenaded itself often). We only ran it on slicks one time and I don't think he ever made a full pass that day because the car twisted up so bad it broke one of the latches on the T Tops.

Like has been said about 500-550hp is the limit on those small roots set ups. Your 434 SBC should be that good on motor already.
Will

anesthes

I have a 412" sbc, and I'm running a Vortech T-Trim.

The 144, 177 we used to use on 302 fords 350 chevy's with smog heads.

As rkless said,a 434" SBC should be making more power n/a than those things did blown.

About 10 years ago I ran a small blower on my '87 vette which was 10:1 compression with aluminum heads, 358". I couldn't run more more than 7ish PSI without reducing the spark advance under 20 degrees. Generally speaking, the car was as fast with full timing as it was with the blower and reduced timing.

If you want forced induction, build the motor around it.

-- Joe

cv67

Well theres always a 6-71

polo had it down the track yet how does it run?

BrianCunningham

a 434ci running twin turbos, makes around 1,500hp

BrianCunningham

Since I'm digging up the past

pologreen1

too big though. I was thinking I could keep it under the hood and have some extra power. I don't car for blowers sticking out of c4's.

Originally thought I'd like n20 but as Bjankuski pointed the trans is only rated for 750hp right now so blasting a 300+ shot on it will just ruin it right away and refills are no fun.

The car has not been dyno tuned yet, and is still running stock out of box parts from Holley, but it will get tuned even better. Good enough to play around with on a weekend considering the car sat for almost 8 years.

Not gone to the track and probably never will. This car does not hook, and frankly I'm fine with it. Honestly it's just a fun car for me. If I had a track car it would be an old front engine dragster or a rail car. Some day I might get a rail car for fun that is some what bullet proof for me to just rip off runs in.

Now I'm wondering how much the 75cc heads are hurting it considering the same price for lower cc's and could have had a little more comp and power.

Oh well overall I love the car and feels like TO ME either a some what refined muscle car that can handle and not rust out or an unrefined sports car.

0Callaway Chris

That picture is a blast from the past... That's the first supercharged car I really had the experience of working on. It was a B&M SuperVette. Roots blower with 4 injector EFI. Very crude. It belonged to a friend, and I put it back to factory stock in a parking lot of his townhouse when he sold the car. I forget where we shipped the SC parts.

Car was fast. 12.8 on 285 width Gatorbacks. 12.4 on NOS. You can see the solenoids in the pic. Very crude, but powerful. And this was in 1989/1990, as the Eagle Talon in the background belonged to my brother (it was a 1990 model)

cv67

was that the one that B and M had occasionally at their old place in Chatsworth? Pic looks familiar

0Callaway Chris

Nope. Pic was from my driveway. That's my brother's 1990 Eagle Talon TSi AWD parked beside it. I put the car back to o.e. in the spring of 1991. This particular one was a 1988 Z52 Convertible w/ 4+3 DN.

dizwiz24

i needed your help with stuff like this when people were bashing me for wanting to build an lsx or literbike beater.

people telling me the sbc cant do it.

with boost it can.

but the doomsayers will still say 'the lsx can make 2000 rwhp vs the sbc only making 1600'

at that point who cares. the 1600 hp car would prob win the dragrace . or for that matter the 800 rwhp car would prob win

cv67

Diz youd want an aftermarket LSx block to get the CI then supercharge it
Or do a big CI SB2.2
Well over 700chp and d6xx tq naturally aspirated with a driveable hydraulic roller is a walk in the park. Lots of potential from there even without a blower. Get rid of the LT1 and do something different
Noone will know what it is...think its a Gen 1 or LSx with 1 coil? You can have that car running 9s easy

You can boost an Lsx and get big power but it wont do it for very long on stock blocks.

or just throw a big big block in it, there are options.

pologreen1

I'd try twin turbo if I did not have to rebuild the motor for less compression too.

I do see some say you have more leeway with turbo than supercharger.