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Username Post: Torque converter help        (Topic#347881)
Am4wag 
Contributor
Posts: 103

Reg: 11-19-15
10-25-17 02:45 PM - Post#2712142    

Putting a bbc in my '69 El Camino.Have 3.42's in the rear with TH400.Cam card says 2200-5300 range.I am familiar with the 500 over low rpm stall,but I don't want to be slipping cruising at 50mph. up.Any input would be appreciated.

The bearer of gossip is a small untrustworthy person who takes delight in someone else's problems. Avoid them.
Let's all make the day count. - Charlie Daniels


 




Shepherd 
Frequent Contributor
Posts: 1332

Loc: Lake George, NY
Reg: 11-11-15
10-25-17 03:41 PM - Post#2712156    
    In response to Am4wag

Bbc has plenty of low and torque, that rpm recommendation is pretty conservative, I think a 2200 convertor should be fine, remember those stall speed numbers are very general, as it can vary some based on your set up. Figure your rpm at 50, see what you come up with.



 
Am4wag 
Contributor
Posts: 103

Reg: 11-19-15
10-25-17 04:52 PM - Post#2712170    
    In response to Shepherd

I currently have a 2000 stall converter in it now behind a "cammed" 350 that I bastarded together with 305 Vortech heads (was in a pinch to get something together so I could move it).Seems a little soggy on the low but cruises nice,but this unknown cam is real thumpity and I believe requires more stall.Fast forwarding I'm putting together a 30 over 454 Gen VI,with these heads:
http://www.gmperformancemotor.com/parts/19331424.h...
10.2 cr forged pistons,forged 502 crank/rods,and this cam along with full matching roller rockers:
https://www.crower.com/camshafts/chevy-396-4 54-hyd...
Don't really plan on racing,mostly street.


The bearer of gossip is a small untrustworthy person who takes delight in someone else's problems. Avoid them.
Let's all make the day count. - Charlie Daniels


 
Shepherd 
Frequent Contributor
Posts: 1332

Loc: Lake George, NY
Reg: 11-11-15
10-26-17 09:22 AM - Post#2712229    
    In response to Am4wag

Fairly mild Bbc cam, you may find with the additional low speed torque of the Bbc, that convertor may stall higher than the Sbc. 2500 should do the job,the degree of slippage at part throttle is minimal as you reach the dynamic stall point.



 
65_Impala 
Very Senior Member
Posts: 4015

Reg: 12-29-02
10-26-17 12:17 PM - Post#2712243    
    In response to Am4wag

Yes, that is a fairly mild cam for a BB. I would expect using the same converter that you will find it has a much higher stall rpm behind the BB compared to the small block and probably would work fine.

You're looking at buying a custom built converter, right? The manufacturer would likely have some good advice about what to use.



 
Am4wag 
Contributor
Posts: 103

Reg: 11-19-15
10-26-17 01:48 PM - Post#2712250    
    In response to 65_Impala

I called around,Protorque said 2600-3000,Coan says 2400-2800,.You think I might as well run what I have and change if needed later?This converter (the shop that built the TH400 I have)is the same converter as early 70's Vettes had.

The bearer of gossip is a small untrustworthy person who takes delight in someone else's problems. Avoid them.
Let's all make the day count. - Charlie Daniels


 
65_Impala 
Very Senior Member
Posts: 4015

Reg: 12-29-02
10-26-17 05:05 PM - Post#2712278    
    In response to Am4wag

You could. If you've been talking to some good manufacturers then they'll be giving you real stall with your engine. Picking a 2000rpm stall converter off the shelf doesn't mean it will stall at 2000rpm with your big block. The generic stall number would be using a typical engine, like a 350 with something like 300hp.



 
498 chevy 
Contributor
Posts: 450
498 chevy
Age: 66
Loc: hayward ca.
Reg: 09-28-07
10-29-17 08:32 PM - Post#2712641    
    In response to 65_Impala

correct about the torque. A high stall will be different from one engine to another. more torque from a bbc to sbc doesn't 2000 rpm for both. bbc will be lock up the converter faster making it a lower stall converter.

http://www.picturetrail.com/webe


 
models916 
Valued Contributor
Posts: 4781

Age: 67
Loc: Addison, IL
Reg: 05-28-10
10-30-17 04:52 AM - Post#2712665    
    In response to 498 chevy

More torque=higher stall. BBC or SBC doesn't matter. Just how much torque is applied to the input side of the converter.



 
grumpyvette 
Senior Chevytalk Moderator -- Performance Subject Matter Expert --
Posts: 17178
grumpyvette
Age: 70
Loc: FLORIDA USA
Reg: 03-16-01
10-30-17 06:05 AM - Post#2712675    
    In response to models916

http://garage.grumpysperformance.com/index.php?thr...

http://garage.grumpysperformance.com/index.php?thr...

http://garage.grumpysperformance.com/index.php?thr...

IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!


 




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