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Author Topic:   Convertors and BBF's

Posts: 416
From: Jasper, TN, USA
Registered: Dec 2000

posted 05-15-2002 03:34 PM     Click Here to See the Profile for SG236   Click Here to Email SG236     Edit/Delete Message   Reply w/Quote
I was talking to a friend of mine last night. I have a 514BBF in a tube chassis mustang that weighs 2340 lbs, has a 2-speed glide for 1/8 mile racing and a 8" 5500 stall TCI convertor. He says the torque in a BBF is too much for a 8 inch convertor. Anyone had any experiences with this combo? My buddy has about the same combo and could never get a 8 inch to hold up.


Russ Hood

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kid vishus

Posts: 6590
From: middle of NC
Registered: Oct 2000

posted 05-15-2002 06:49 PM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
There is no way unless his convertor was junk, that an 8" shouldnt be able to handle that motor. Especially if you are running a glide, which means you are also using a gm convertor. Most of the bbc guys all run 8" convertors, (except for the diggers, and they run a 9"). The guy who finished my rollcage for me has a 63 vette tube chassis car with a 540 bbc in it, powerglide, 8" Coan convertor. First full power pass this year with this brand new car it ran 5.12 with a 1.14 60' time, and the convertor is 5 years old.

Another friend with a 555 bbc has an 8" Coan in his car, and his motor made 745 ft lbs of torque, and 905 hp in a 3300 lb car, and it lives. (no offense, but your 514 isnt making 700+ ft lbs of torque)

I think your buddy was trying to run junk convertors behind a good running motor.

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Butch Jennings

Posts: 633
From: No. California
Registered: Apr 2000

posted 05-15-2002 07:14 PM     Click Here to See the Profile for Butch Jennings   Click Here to Email Butch Jennings     Edit/Delete Message   Reply w/Quote

I've been running an 8" Munsinger in mine for quite a few years now. It's only 466 cubes but it weighs 3300+ lbs.

460 powered 1967 Comet Cyclone
10.271 @ 130.231
Butcher's Home Page
"Friends don't let friends drive Chevys"

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Posts: 2954
From: Batesville,MS. , U.S.A.
Registered: Mar 2002

posted 05-15-2002 10:37 PM     Click Here to See the Profile for jsracingbbf   Click Here to Email jsracingbbf     Edit/Delete Message   Reply w/Quote
I run a 8" PTC convertor on a glide behind a 514 BBF with no problems, it holds up just fine. Maybe the convertor sprag was on its way out or something. I don't know. You should be able to run an 8" behind that motor. Are you running a plate conversion kit or a JW flywheel. I reccomend machining the front pump facing a little bit if your running the JW bellhousing like I am. This helps take some of the load off of the front pump since this is the new location the bellhousing bolts to on this set up.
A 9" convertor should work in your set up also it just depends on where you like to launch the car at ( RPM's ) and how much bottom end you have. Hope this helps.

Jerry Smith
69 Pro ET Mustang
514 cid Alcohol/ Enderle injection
5.60's@ 119 MPH 1/8th

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Posts: 416
From: Jasper, TN, USA
Registered: Dec 2000

posted 05-16-2002 09:37 AM     Click Here to See the Profile for SG236   Click Here to Email SG236     Edit/Delete Message   Reply w/Quote
Thanks guys,

My friend used Coan and TCI. Finally TCI sent the last one and said you have way to much motor. They said the BBF motor has tons more torque than the BBC.

Anyway his Probe runs 5.20s and has 825 lbs of torque. The torque on my 514 is 682.

I will definitely throw the 8" TCI and go get'em!

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Just Strokin

Posts: 754
From: Tuscaloosa, Alabama
Registered: Dec 2001

posted 05-16-2002 01:08 PM     Click Here to See the Profile for Just Strokin   Click Here to Email Just Strokin     Edit/Delete Message   Reply w/Quote
I ran an 8" TC with about 4500 stall. This worked pretty good with a PG. It kept the motor out of peak torque till you were a few yards out of the hole. A loose TC around 5500 would blow the tires off the car. Never had a bit of trouble from the TC. It was made by JW and the PG was the frist UltraGlide they ever shipped.

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