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Different types of throttle bodies


MeanLemons
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I had my hands on so many throttle bodies over the years. Probably over 200 of them. AND I just recently actually noticed this....

 

for 91-95 HO engines. There’s two types of throttle bodies and I can’t figure out why there is a difference. 

 

Theres the smooth and the ribbed.  (No I'm not talking about condoms lol.

 

I’m wondering why there’s a difference? Perhaps it’s early HO such as 91-92 then there’s 93-95? (I just came up with the numbers). Or is it a vehicle specific? Such as XJ/MJ? 

A6DF8BBC-583D-49B4-959A-3FDABEF5957E.jpeg

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1 minute ago, HOrnbrod said:

One difference is the throttle body mounting for the MAP sensors on the newer ones.

ulloM1E.jpg

That’s right   I mean I knew that 96-04 had same TBs with MAP mount on the side.

 

its the two different 91-95 TBs that had me wondering why one is smooth and another is ribbed. 

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5 minutes ago, PFCLeist said:

It almost looks like a heat sync, to cool the air as it's venturied into the intake manifold. Thats ridiculous though, it probably has something to do with strength. 

Right. I wanted to know why it changed and when was the change taken effect. On what years and what jeep model. 

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9 minutes ago, HOrnbrod said:

They look like casting numbers...

Indeed   I also noticed that those smooth TBs doesn’t have mopar part numbers on the IAC housings. Makes me wonder if they were aftermarket replacements? 

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