Which Throttle Body

[audio1der]

Wow. I was just gonna add that the factory TB was smooth so I polished the super rough machining marks off my aftermarket unit.

 

[Hemi_Express2013]

Some more laymen explanations for you guys to absorb.

Basically a Venturi compresses a moving column of air/liquid,and as such the shear factor from the now compressing moving column of air negates the boundary layer,as the compressing air shears it off,therefore you want as smooth a surface as possible with-in the venturi,with nothing to shear off and impede the compressing airs flow.
When the compressed air molocules exit the venturi they rapidly expand,almost explode back to size and push like hell on the next air molocule beside itself,thereby increasing the air velocity on the exit of the venturi.

Hope that makes sense and helps to simplify the principles behind a venturi for you guys

Very helpful Hornet, thank you for taking the time to explain this.

 

[Hemi_Express2013]

The IM is plastic(?Bakelite?). Seat the TB onto it properly, open it up, scribe the inner circumference with something sharp. Remove the TB, stuff a rag down the IM and Dremel the excess material away. I vacuumed for a LONG time once done to make sure I got all the filings, then bolted the TB back on.
There was a significant overlap once the 87mm TB was placed on the IM, and it seemed common sense if the new TB were to work to its potential.


If I could ask, what angle did you cut the lip off, 45? And is there a need to taper the cut into the intake manifold like an inch or so. Could you explain how you accomplished this. Any advice would surely help me in this process. Thanks for your time.

 

[Hemi450hp]

Ok well just out of curiosity, what would be the performance loss if going with the 85mm and adding headers later? Is there a significant loss of performance with that setup?


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There is no loss of performance by running the 87mm on a stock truck, but the 87mm also wont show any gains over the 85mm on a stock truck. In the end, if you have any thoughts about adding headers later on, I would go straight to the 87mm to save you some cost in the long run. Its cheaper to go that route now than to buy an 85mm, then have to sell it and upgrade down the road.