*YACT*motor displacement: can changing a carburetor change the liter statistic?

[NikPreviousAcct]

I was talking to my girlfriend's roommate's boyfriend. He's ASE certified through the local college, and is now working on getting certification for body work -namely, paint jobs. Anyway, he's quite familiar with the 2.8L V6 that sits in my 1985 S-10 Blazer and knows exactly how things are configured - this from recent conversations about what to do with it.

Anyway, I told him the year, the make, and the model of the rig and he asked if I had the 2.8l or the 4.3L - so he knows what he's talking about. He also knew that, since I have the 2.8L, he also knew that the 4.3L won't fit if I wanted to change it since the 4.3 is at 90 degrees and the 2.8 is at 30 degrees (or was it 60 degrees???). Blah blah blah.

He asked if I had a 2-barrel or a 4-barrel carb, so I said I had a 2-barrel.

What did he say next?

If I were to change the 2-barrel and it's intake to a 4-barrel and an intake to match, the liter displacement will make the block equivalent to a 4.3L.

Since I'm not the UberCarGod, I didn't question the ASE certified UberCarGod. But, in conversation with Viper GTS, he and I got a little confused. I didn't think it was possible for the carb change to change the liter count, but apparently it can.

Is this true!?

nik

 

[Kadarin]

Nik, it is not true. Engine displacement is a function of the bore and stroke of the cylinders, and has nothing to do with induction.

 

[PsychoAndy]

Um, AFAIK carbs wont affect displacement. CID is a physical calculation of the volume of the stroke and the bore IIRC.

Now the a 4 barrel carb, you will get more power.

-PAB

 

[NikPreviousAcct]

Originally posted by: Astaroth33
Nik, it is not true. Engine displacement is a function of the bore and stroke of the cylinders, and has nothing to do with induction.

That's what I thought, but threw out that idea when he told me. Then, when Gregg said the same thing, I got confused.

nik

 

[NikPreviousAcct]

Originally posted by: PsychoAndy
Um, AFAIK carbs wont affect displacement. CID is a physical calculation of the volume of the stroke and the bore IIRC.

Now the a 4 barrel carb, you will get more power.

-PAB

Yeah, and worse gas mileage and I might actually not pass DEQ -or so he tells me.

nik

 

[Viper GTS]

Originally posted by: Astaroth33
Nik, it is not true. Engine displacement is a function of the bore and stroke of the cylinders, and has nothing to do with induction.

Exactly what I said.

Viper GTS

 

[Jzero]

Maybe he's saying the 4-barrel carb would give you comparable performance to having the 4.3L?

 

[dirtboy]

Can you change the size of a gallon of milk by putting a larger hole on top? Nope. Same with cars.

 

[PsychoAndy]

Originally posted by: ffmcobalt

Originally posted by: PsychoAndy
Um, AFAIK carbs wont affect displacement. CID is a physical calculation of the volume of the stroke and the bore IIRC.

Now the a 4 barrel carb, you will get more power.

-PAB

Yeah, and worse gas mileage and I might actually not pass DEQ -or so he tells me.

nik

More air, more fuel, more power.

Hey, it worked for the '60's!

And yes, you may lose emissions cert due to the increase in CO2 and/or particulates.

-PAB

 

[NikPreviousAcct]

Originally posted by: Viper GTS

Originally posted by: Astaroth33
Nik, it is not true. Engine displacement is a function of the bore and stroke of the cylinders, and has nothing to do with induction.

Exactly what I said.

Viper GTS

Exactly what you were also confused about just like I was when I heard this from someone with obviously WAY more experience than I had. I wasn't about to question someone who can fix anything and everything on the car - but I understand why he'd tell me this...

nik

 

[PsychoAndy]

!@#%##%@&@^#&#^!

SON OF A BITCH! MAUL'S BEEN CHEATING ON ME?

-PAB

 

[NikPreviousAcct]

Originally posted by: Jzero
Maybe he's saying the 4-barrel carb would give you comparable performance to having the 4.3L?

No, I see him saying it. Photographic memories are awesome. I very distinctly remember him saying that the size displacement will equal the 4.3L

nik

 

[NikPreviousAcct]

Originally posted by: PsychoAndy
!@#%##%@&@^#&#^!

SON OF A BITCH! MAUL'S BEEN CHEATING ON ME?

-PAB

Haha - I hadn't seen him online in a week or so, so I was naturally happy to see him log on to AIM and decided to play it up.

nik

 

[Kadarin]

Originally posted by: ffmcobalt

Originally posted by: Viper GTS

Originally posted by: Astaroth33
Nik, it is not true. Engine displacement is a function of the bore and stroke of the cylinders, and has nothing to do with induction.

Exactly what I said.

Viper GTS

Exactly what you were also confused about just like I was when I heard this from someone with obviously WAY more experience than I had. I wasn't about to question someone who can fix anything and everything on the car - but I understand why he'd tell me this...

nik

I, too, have met quite a number of people who were mechanically proficient at fixing anything engine-related, yet didn't understand the science behind how engines work and how they build horsepower.

 

[Pacfanweb]

Nik,

I don't understand why he would tell you that. It's completely wrong.

Plus, you can absolutely swap a 2.8 for a 4.3. Do a google search and you'll get tons of hits about it. Now whether you'll still be emissions legal, I can't answer for your state.

 

[PsychoAndy]

Originally posted by: ffmcobalt

Originally posted by: PsychoAndy
!@#%##%@&@^#&#^!

SON OF A BITCH! MAUL'S BEEN CHEATING ON ME?

-PAB

Haha - I hadn't seen him online in a week or so, so I was naturally happy to see him log on to AIM and decided to play it up.

nik

HOMEWRECKER! :|

-PAB

 

[DougK62]

This supposed ASE certified fella sounds like a moron. A carb doesn't have anything to do with the engine's dosplacement. Also, the 4.3 will most DEFINITELY fit in your truck. Heck - they made them with 4.3s straight from the factory. A 4.3 will bolt into your truck using all factory parts - you can even put a 350 V8 in there pretty easily. The 2.8 is a 60 degree block - meaning that the angle between the two banks of cylinders (the "V") is 60 degrees.

Go tell him he's a disgrace to his profession.

Any chance you just misunderstood what he was saying?

 

[Viper GTS]

Originally posted by: ffmcobalt

Originally posted by: Viper GTS

Originally posted by: Astaroth33
Nik, it is not true. Engine displacement is a function of the bore and stroke of the cylinders, and has nothing to do with induction.

Exactly what I said.

Viper GTS

Exactly what you were also confused about just like I was when I heard this from someone with obviously WAY more experience than I had. I wasn't about to question someone who can fix anything and everything on the car - but I understand why he'd tell me this...

nik

Always question.

While I was willing to consider the possibility that I was wrong, I was pretty sure I was right.

Displacement = (pi)(bore/2)²(stroke)

Viper GTS

 

[ElFenix]

while theres no replacement for displacement, being blown is pretty nice

 

[Viper GTS]

Originally posted by: ElFenix
while theres no replacement for displacement, being blown is pretty nice

Indeed.



Viper GTS

 

[Jzero]

Originally posted by: ffmcobalt

Originally posted by: Jzero
Maybe he's saying the 4-barrel carb would give you comparable performance to having the 4.3L?

No, I see him saying it. Photographic memories are awesome. I very distinctly remember him saying that the size displacement will equal the 4.3L

nik

Not that you heard him wrong, but more that he meant to say it would give power similar to the 4.3, but it came out saying to would make the displacement the same....?

I dunno hehehe

It doesn't make sense to me either

 

[NikPreviousAcct]

Originally posted by: Jzero

Originally posted by: ffmcobalt

Originally posted by: Jzero
Maybe he's saying the 4-barrel carb would give you comparable performance to having the 4.3L?

No, I see him saying it. Photographic memories are awesome. I very distinctly remember him saying that the size displacement will equal the 4.3L

nik

Not that you heard him wrong, but more that he meant to say it would give power similar to the 4.3, but it came out saying to would make the displacement the same....?

I dunno hehehe

It doesn't make sense to me either

Hhe and his girl were having some issues and he wasn't in the best frame of mind, come to think of it.

nik

 

[NikPreviousAcct]

Originally posted by: Pacfanweb
Nik,

I don't understand why he would tell you that. It's completely wrong.

Plus, you can absolutely swap a 2.8 for a 4.3. Do a google search and you'll get tons of hits about it. Now whether you'll still be emissions legal, I can't answer for your state.

The 4.3 won't fit in my rig. I've heard this from him and several others - one of which makes a living doing this kind of work.

nik

 

[BoberFett]

Originally posted by: Viper GTS

Originally posted by: ffmcobalt

Originally posted by: Viper GTS

Originally posted by: Astaroth33
Nik, it is not true. Engine displacement is a function of the bore and stroke of the cylinders, and has nothing to do with induction.

Exactly what I said.

Viper GTS

Exactly what you were also confused about just like I was when I heard this from someone with obviously WAY more experience than I had. I wasn't about to question someone who can fix anything and everything on the car - but I understand why he'd tell me this...

nik

Always question.

While I was willing to consider the possibility that I was wrong, I was pretty sure I was right.

Displacement = (pi)(bore/2)²(stroke)

Viper GTS

You mean

Displacement = (pi)(bore/2)²(stroke)(cylinders)

 

[MrPhelps]

The cars computer will be a large chore to make it work with a different motor or carbs. Nothing is impossible.

I don't know anyone that ever had a blower but I used Nitrious oxide alot.