What's the stock Throttle Body size?
06-26-2003, 12:40 AM
#4
Re: What's the stock Throttle Body size? Hmmm, so that means I should be able to chuck-up my stock TB on the lathe and bore it out to 80mm, right? This is going to be fun . . . then I'll have to figure out how to cut a perfectly round disk out of aluminum sheet metal to make a new butterfly; I think I can rough one out with a saw, drill the mounting holes, then bolt it to a round piece of bar stock so I can true up the circular outer shape on the lathe . . . seems easy, why aren't there people doing this?
06-26-2003, 12:50 AM
#5
I can shift faster than you.
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Re: What's the stock Throttle Body size? The inlet on the LS1/LS6 intake is only ~75mm, so going to a bigger bore TB without opening up the intake would not be very effective. BBKs 80mm LS1 TB comes with an adapter/reducer for this very reason. Some people have opened up the inlet to accept the larger TB though, but it does take some work.
06-26-2003, 01:03 AM
#6
Re: What's the stock Throttle Body size? OK thanks Jason, you just answered my next question! The intake is nylon, so opening that up shouldn't be too bad, just gotta keep the chips outa the engine! I'm going to have the intake off to do the LS6 PCV upgrade, so that'll be the perfect time to do it . . .
06-26-2003, 08:10 AM
#7
TECH Fanatic
Re: What's the stock Throttle Body size?
Hmmm, so that means I should be able to chuck-up my stock TB on the lathe and bore it out to 80mm, right? This is going to be fun . . . then I'll have to figure out how to cut a perfectly round disk out of aluminum sheet metal to make a new butterfly; I think I can rough one out with a saw, drill the mounting holes, then bolt it to a round piece of bar stock so I can true up the circular outer shape on the lathe . . . seems easy, why aren't there people doing this?
Look closely at the manifold flange before you try to open it up.
My $.02
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06-26-2003, 10:42 AM
#8
LS1Tech Co-Founder
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Re: What's the stock Throttle Body size? HAHA.
I have a custom bored 78mm stock TB that is a nice conversation piece.
I had it done four years ago.
When the BBK came out I was like dang I can port my own.
But the intake inlet is like 75.5mm's and this one won't seal now. The BBK comes with a reducer plate.
We filled in one spot but other than that it's was no biggie. Cal if you want to mess with it email me it still needs some work but it had a bigger blade too.
I have a custom bored 78mm stock TB that is a nice conversation piece.
I had it done four years ago.
When the BBK came out I was like dang I can port my own.
But the intake inlet is like 75.5mm's and this one won't seal now. The BBK comes with a reducer plate.
We filled in one spot but other than that it's was no biggie. Cal if you want to mess with it email me it still needs some work but it had a bigger blade too.
06-26-2003, 11:32 AM
#9
TECH Fanatic
Re: What's the stock Throttle Body size?
HAHA.
I have a custom bored 78mm stock TB that is a nice conversation piece.
I had it done four years ago.
When the BBK came out I was like dang I can port my own.
But the intake inlet is like 75.5mm's and this one won't seal now. The BBK comes with a reducer plate.
We filled in one spot but other than that it's was no biggie. Cal if you want to mess with it email me it still needs some work but it had a bigger blade too.
I have a custom bored 78mm stock TB that is a nice conversation piece.
I had it done four years ago.
When the BBK came out I was like dang I can port my own.
But the intake inlet is like 75.5mm's and this one won't seal now. The BBK comes with a reducer plate.
We filled in one spot but other than that it's was no biggie. Cal if you want to mess with it email me it still needs some work but it had a bigger blade too.
Right now it's a desk ornament like the polished, powdercoated LS1 rod.
I never liked the reducer idea for the BBK 80 to LSX manifold.
06-26-2003, 01:29 PM
#10
Re: What's the stock Throttle Body size? OK, looks like BBK starts with their own casting design to solve some of the problems. I could just machine a whole new TB out of bar stock, but that still leaves the problem of modifying the intake. If I'm understanding correctly, when you bore the intake manifold out to 80mm, there isn't enough material left of the mounting flange to properly seal to the new TB. Is this correct?
06-26-2003, 02:05 PM
#11
TECH Fanatic
Re: What's the stock Throttle Body size?
OK, looks like BBK starts with their own casting design to solve some of the problems. I could just machine a whole new TB out of bar stock, but that still leaves the problem of modifying the intake. If I'm understanding correctly, when you bore the intake manifold out to 80mm, there isn't enough material left of the mounting flange to properly seal to the new TB. Is this correct?
06-26-2003, 02:43 PM
#12
Re: What's the stock Throttle Body size? Yeah I just found a picture of it online; I see what you mean, one picture is worth a thousand words! Looks like the inlet flange on the intake is quite narrow and uses a thin, O-ring like gasket very close to the edge that would totally miss the bigger TB. Well, so much for that idea! It would take a lot of JB weld or that Devcon stuff to build up the intake flange.
