Question for Chevy gurus - swapping a GM TBI setup on my 80 tbird

Topic: Question for Chevy gurus - swapping a GM TBI setup on my 80 tbird (Read 2747 times) previous topic - next topic

Question for Chevy gurus - swapping a GM TBI setup on my 80 tbird

Reply #15 – December 25, 2013, 10:35:35 AM

Ok i wioll chime in on this one and this one only. You have a flat spot in the accelerator circuit. Very easy to tune out. What is happening is your carb needs to be fattened up on the [power valve circuit and accelerator pump discharge. Very easy to do. The 2150 is an easy reliable and very good carb when tuned up correctly. Good luck

Question for Chevy gurus - swapping a GM TBI setup on my 80 tbird

Reply #16 – December 25, 2013, 11:00:44 AM

How do I adjust that?

Question for Chevy gurus - swapping a GM TBI setup on my 80 tbird

Reply #17 – December 25, 2013, 11:17:09 AM

Assuming a stock carb, if you don't have the hot air pickup from exhaust manifold connected to the air cleaner it will stumble... Otherwise you can increase pump shot(often only helps briefly), check/raise float level or increase jet size(good luck on finding them for that Ford carb though)

Question for Chevy gurus - swapping a GM TBI setup on my 80 tbird

Reply #18 – December 25, 2013, 03:57:27 PM

Here you go http://www.ebay.com/sch/sis.html?_kw=Ford+Motorcraft+2100+2150+Carburetor+121+body+Carb+2V

OK if as you point out your carb runs fine other than hard acceleration and down shifting lag. You need to work on what i posted. As far as the jets i posted some i found on E BAY. like i said i just trashed all my carb stuff. Had i known i would have sent you all of it. By the way if you need bigger jets they can actually be reamed out bigger with thin reamers. You can size the jets with part numbers or indexed drill bits. As the matter of fact you can drill jets out. Not the best way but it can work in a pinch. But what you are shooting for is 30CC discharge from your accelerator pump with 10 strokes and a power valve set somewhere around 10-12 inches of vacuum fall off. I have tuned hundreds of these carbs very successfully in the old days. As far as hot air it is necessary in cold climates and warm up. But i am not sure of your climate. These carbs as i explained are very easy to tune properly without stove heat in the winter. Good luck!!

Question for Chevy gurus - swapping a GM TBI setup on my 80 tbird

Reply #19 – December 25, 2013, 07:29:53 PM

Try and turn the idle mixing screws a 1/4 turn out each. It might help. Sounds like its leaning out.

Question for Chevy gurus - swapping a GM TBI setup on my 80 tbird

Reply #20 – December 25, 2013, 07:58:10 PM

Normally backing out the idle screws wont help as the idle circuit is out of the picture at or around 1100 RPM. But if he is slightly lean it might work but i dought it. What he needs is mid range enrichment and accelerator pump discharge fattening up. Carbs are easy but many mess them up quite often. I also modify the emulsion tubes to bring the main jet feed in sooner and correct tip in hesitation on these carbs. I would install a set of jets 2 -3 steps higher and adjust the pump discharge by 10% and increase the power valve setting to a min of 10-12 HG nominal.it has been many years since i messed with carbs. That is other than WEBERS and AFB designed units on my blower motors. Also you are aware of the fact that the 2150 can be directly replaced by a 2bbl holley carb. The stud placement and base arrangement is the same. Those carbs also came on JEEPS and AMC . They are so easy to tune and i used to build them to the MAX. So i guess a guy like me that ran QUADRAJETS and had many people laugh in my face about that. That is untill they saw mt tail lights through here front windshield. All kidding aside the 2150 is a real good carb easy to tune and quite responsive for a performance aspect. They really run great when set up properly.