Bruno input shaft

At what horspower should you switch from the 1" to the 1.25"? Is there any fluid problems when you switch to the 1.25"? One of the convertor builder told me it is better to have the 1" shaft for fluid flow.

 

Brt

We twisted but never broke the small shaft at 2900 lbs 2400hp. The big shaft has cooling issues for sure. It has been an expensive hassle for us and is still not resolved. Chance converter and FFI was a big help.

 

bruno over heating oil

overkill69, Can you let us know what you found on the over heating issue on the bruno? thanks again

Butch

 

Have you ever talked to Rod @Spec-rite Torque Conveters? He hauls ass with a Bruno and BAE in his own pro mod. Super nice guy

 

Brt

We have the big pan and all mods by ffi...grant macrary. The converter snout bore id is critical as well as the spacing out of the pump. Ours is fast and the fluid is living but it runs hot especially at idle.

 

fluid running hot on 1.250 input bruno

anyone have a solution to this problem?
if so please chime in

 

We run the smaller shaft , and run a trans cooler under the back of the car , with a fan that runs all the time the car is running. The extra length of the lines do help too with the volume of fluid.
We run a Chance converter , this is behind a 521BAE.

Before this be ran a Big Block Chevy , that ran 6.6s. The Bruno ran cooler then , but the HEMI is making more power

Cheers Wayne

 

At what temperature are you cosidering hot ? Where in the run are you seeing these temperatures ?

 

140 idling 220 to 285 after burnout 300 after a run. Basically it's happier going down track than idling.

 

bruno over heating oil

I think part of the trouble is the burnout we make sure we turn it hard enough to lock up the converter in the burn out , don't do a low RPM burn out, we don't even run a cooler tow it to the lanes and pits and cool it between rounds no problems.

 

All of the heat buildup has to be in the convertor, there really isn't anything else in the Bruno to build up heat, unless the band is too tight and dragging. We do the same thing as GT, fortunately we have the time between rounds to do that with the format our nostalgia association runs, don't know how you would be able to bracket race one in later rounds though.

 

brt

we have 34.5 tires lit at approx 8000rpm for the burnout. That's all it's going to get.
Obviously the heat comes from the converter so we've reworked it a couple times and made improvements.
I think it has an internal leak that can't force fluid flow at lower rpm. If not,the input shaft setup is just too restricted.
I've talked to everybody that mods brunos and about 3 people that have the same issues as mine.
I'm going to inspect the plate behind the pump and see if it shows any signs of a leak path.
If that's not it we're just going to run it until it fails.