Duel Bore throttle body
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Staging Lane
Joined: Oct 2005
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Duel Bore throttle body From what iv driven, i am not a fan of a single bore Tb (or likewise 2bbl carb)
Every car that has a duel bore Tb (or 4bbl) seems to me to be much more responsive in a daily driver/redlight racing setting to me.
Is there a Duel bore Tb for the LS1? is there even an intake manifold set up to deal with the increased flow of a duel Tb?
Every car that has a duel bore Tb (or 4bbl) seems to me to be much more responsive in a daily driver/redlight racing setting to me.
Is there a Duel bore Tb for the LS1? is there even an intake manifold set up to deal with the increased flow of a duel Tb?
Originally Posted by Mrwilson
From what iv driven, i am not a fan of a single bore Tb (or likewise 2bbl carb)
Every car that has a duel bore Tb (or 4bbl) seems to me to be much more responsive in a daily driver/redlight racing setting to me.
Is there a Duel bore Tb for the LS1? is there even an intake manifold set up to deal with the increased flow of a duel Tb?
Every car that has a duel bore Tb (or 4bbl) seems to me to be much more responsive in a daily driver/redlight racing setting to me.
Is there a Duel bore Tb for the LS1? is there even an intake manifold set up to deal with the increased flow of a duel Tb?
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From: Live Oak, FL - in the woods where the creatures lurk.
What makes you think a dual will flow better than a single on an LSx manifold, with one inlet? It would seem to me to totally change the airflow dynamics. Not trying to be antagonistic, would like to hear your reasoning. Now, an individual TB for each cylinder on a high performance app, I can see. Which of course would have to be a custom intake, or one of the Aussie manifolds.
gwj
gwj
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From: Live Oak, FL - in the woods where the creatures lurk.
When you are talking about a 2bbl vs 4bbl carb, that is not a good comparison to an EFI intake where the computer adusts the A/F.
Besides, a 4bbl carb has primary and secondary bores and the fuel enrichment can be adjusted better for WOT + the increased airflow of the secondaries (vs a 2 bbl carb).
Besides, a 4bbl carb has primary and secondary bores and the fuel enrichment can be adjusted better for WOT + the increased airflow of the secondaries (vs a 2 bbl carb).
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Staging Lane
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Originally Posted by gwj
When you are talking about a 2bbl vs 4bbl carb, that is not a good comparison to an EFI intake where the computer adusts the A/F.
Besides, a 4bbl carb has primary and secondary bores and the fuel enrichment can be adjusted better for WOT + the increased airflow of the secondaries (vs a 2 bbl carb).
Besides, a 4bbl carb has primary and secondary bores and the fuel enrichment can be adjusted better for WOT + the increased airflow of the secondaries (vs a 2 bbl carb).
right, but im not compairing a carb to a TB, im just saying...with a duel bore and 4bbl carb, there is/are primariy(ies) and a/are secondary(ies)
Um, actually i dont think i worded my question correctly about the increased flow. What i ment, was as you said gwj, the flow charisterics would be diffrent.
Im not talking about increased flow, just diffrent application of throttle.
I don't know for sure but I think the only advantage to having a dual throat TB is space saving or fitment.
My Cobra came with a dual TB. I suspect if they tried to use a single TB that flowed as much it wouldn't have fit under the hood.
Just a guess.
My Cobra came with a dual TB. I suspect if they tried to use a single TB that flowed as much it wouldn't have fit under the hood.
Just a guess.
two smaller orifices will net a higher velocity than one big one, giving it better part throttle driveability and throttle rsponse. its the same reason people dont just hog their cylinder heads out or run manifolds with no runners. intake charge velocity. yeah, a single opening is what the gm engineers choose because they weren't after low end(tip-in) throttle response. it would tak alot of homework and money to keep the benefits of a single port throttlebody while adding the benefits of a dual port throttlebody. there is a lot more to it than just this, but it should give you a basic idea.
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Staging Lane
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Originally Posted by slowpoke96z28
two smaller orifices will net a higher velocity than one big one, giving it better part throttle driveability and throttle rsponse. its the same reason people dont just hog their cylinder heads out or run manifolds with no runners. intake charge velocity. yeah, a single opening is what the gm engineers choose because they weren't after low end(tip-in) throttle response. it would tak alot of homework and money to keep the benefits of a single port throttlebody while adding the benefits of a dual port throttlebody. there is a lot more to it than just this, but it should give you a basic idea.
but, what are the benifits of a single bore? Not that im saying there are none, i just dont know cuz i just never cared for them.
I mean, if i get a manual trans, there realy is no problem...but thats a diff story with an auto i guess.
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From: England
Originally Posted by Mrwilson
yeah, that pritty much answers my question..thanks.
but, what are the benifits of a single bore? Not that im saying there are none, i just dont know cuz i just never cared for them.
I mean, if i get a manual trans, there realy is no problem...but thats a diff story with an auto i guess.
but, what are the benifits of a single bore? Not that im saying there are none, i just dont know cuz i just never cared for them.
I mean, if i get a manual trans, there realy is no problem...but thats a diff story with an auto i guess.
In addition I would say the engine response if actually very good at low rpms even with the auto box. This comes from some one whole also has a 4brl setup carb on a tuned Rover V8, and a EFI V12 Jaguar with twin TB's.
I'm not saying it can't be imporved upon, but I think most noticable changes would be in the drivetrain. A shiftkit and a stall would make a big difference, as would leaving the shifter in D (3rd) and not OD (4th), if need be you could even manually hold the box in gear. Combine this with a lightweight flywheel, free flow exhaust, LT's, lid, ported throttle body, ls6 intake and most importantly a TUNE. I honestly doubt you'll still feel the need for a twin bore TB.
Originally Posted by slowpoke96z28
two smaller orifices will net a higher velocity than one big one, giving it better part throttle driveability and throttle rsponse. its the same reason people dont just hog their cylinder heads out or run manifolds with no runners. intake charge velocity. yeah, a single opening is what the gm engineers choose because they weren't after low end(tip-in) throttle response. it would tak alot of homework and money to keep the benefits of a single port throttlebody while adding the benefits of a dual port throttlebody. there is a lot more to it than just this, but it should give you a basic idea.
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Staging Lane
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Originally Posted by ShevrolayZ28
I like that better than my explaination (my guess lol). But the air stream is merged again as soon as it leaves the dual throat TB, does the air slow down again?
Originally Posted by 300bhp/ton
sorry that doesn't make sense to me. the engine will repsond the same with an automatic gear box as it will with a manual. There may be a difference in responsiveness but this will be drivetrain related and should not be confused with the engine itself as they are totally seperate issues.
With a single bore you either get open, or closed. and with an auto trans...if you try to open it more for more power...you may end up downshifting. With a duel bore, if your not getting enough power from the primary bore, you tip in a bit more, and start opening up the second, and giving you more power without having to downshift.
With the std tranny, you could just leave it in gear, and open the tb up to however much you want.
