rx7vadim

Can i use any double pumper / four barrel holley carb on a rotary? Are they easy to rebuild. is there site on the net which describes rebuild process?

Sideways7

iTrader: (7)

Why are you wanting to run a carb anyway? They are inferior to EFI in basically every way.

rx7vadim

why is that? with holley you can make same hp as tuned efi

rx7vadim

i dont trust my 20 year old fuel injection
carbs are still being used on street and race track on 13bs and 12a. i think it it m ore reliable and dont need no laptops to tune.

Sideways7

iTrader: (7)

First off, what are your goals? If its for a street car, then there is no reason to go carb. You will lose power at some point over the rev range, whether it is low end or top end (probably low end) and probably wont really gain any power unless it has a major port job. Sure you don't need a laptop to tune it, but that means you will never have as good of a tune. It also has no control over spark like EFI system do. There is a reason that no cars use carb setups anymore - because they just aren't as good. Basically the only reason to use a carb is if you're too cheap or too lazy to mess with fuel injection, and the too cheap only applies to extreme porting.
As for your "20 year old fuel injection" there is likely nothing wrong with it. Get the injectors cleaned and replace any cracking lines and your good to go.

rx7vadim

why do you think fuel injection was developed? low emissions and fuel economy. auto companies were pushed by rules a regulations.

Icemark

You are dreaming.

As a hint... on a non turbo rotory... better fuel economy (leaning out of the engine) results in more power.

If carbs are so great why do they make retrofit FI kits for old GM, Ford, and Dodge V8 motors, that typically give you an extra 15% increase in power as well as simular gains for fuel economy???

A carb is inferior to any fuel injection system on a street driven vehicle.

and why did you feel the need to start a 2nd thread on this???

Sideways7

iTrader: (7)

And why do you think that every single racing car that isn't bound by either money or regulations uses fuel injection?
Hint: it gives more power

snowball

AHAHAHAHAHAHAHA....
that made me laugh so hard.
all the F1 cars are running carbs... *rolls eyes*

rx7vadim

So If I Install A Holley Carb On S5 I Will Loose 15% In Hp, The Engine Would Make 135hp, I That What Ur Saying Ice Man

Keegan

i love my 650 doule pumper and will never go back

rx7vadim

So If I Install A Holley Carb On S5 I Will Loose 15% In Hp, The Engine Would Make 135hp,?????????????????i dont think so

Icemark

Don't think you read my post. Go back and read it again.

RotaryEvolution

iTrader: (30)

also a double pumper is only suited for a large ported motor, it would drown a stock motor. the CFM of a carb needs to be taken into effect whenever tossing a carb onto an engine so you have to meet the airflow/fuel needs of the engine.

so yes, Mark is right that if you toss that carb on there i would expect you would be losing power, might make it back up top but i can almost guarantee it won't be the same car out of the hole.

Aaron Cake

iTrader: (1)

If it's an S5, removing the EFI also kills the VDI... I'd wager that's a pretty big loss even if the carb manifold has much shorter runners...

And it would run like poop.

Megasquirt = $200
Carb = >$200

It's a no brainer.

Sideways7

iTrader: (7)

Like I said in my post, you might be able to get the same peak power with the right carb manifold and the right jet, but you would not have the same power on the low end, which is bad for a street car.

rx7vadim

what about extra stuff for magasquirt. add $150

Aaron Cake

iTrader: (1)

What extra stuff?

A little bit of wire, but most people should have that already. If you want to do things nicely you would make a new wiring harness with it's own fuse box, but that's only about $25 worth of extra stuff...

Keep in mind that the carb requires a new fuel pump, regulator, ignition system, etc.

rx7vadim

do u need relay box, usb cable, intake temp sensor

Aaron Cake

iTrader: (1)

2 relays (one for the 'Squirt and one for the fuel pump), and the intake sensor is already on the car.

You only need a USB cable if the laptop doesn't have a serial port.

Sideways7

iTrader: (7)

These days most of them don't though. But a usb cable is super cheap.

snowball

anything that costs less than a tank of gas really cant be taken seriously as an expense.