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Saturday Night Racer >> RACE TECH >> bako hobby rear end ?
http://www.latemodelracer.com/cgi-bin/yabb2/YaBB.pl?num=1253242909

Message started by W1CK3D R4C1NG on 09/17/09 at 8:01pm

Title: bako hobby rear end ?
Post by W1CK3D R4C1NG on 09/17/09 at 8:01pm

are the bako hobby's allowd to run a full or mini spool in the rear ends?

i looked at the rules and it says "no aluminum spools" does that mean that steel spools or ok?

Thanks...
Rich

oh, and what gears should he be running with a powerglide?

Title: Re: bako hobby rear end ?
Post by TIM_BEWLEY on 09/17/09 at 10:29pm

ok the way i read it

411 is the most popular

Title: Re: bako hobby rear end ?
Post by 17t_racer on 09/18/09 at 6:32am

W1CK3D R4C1NG wrote on 09/17/09 at 8:01pm:

Yes you can run a full spool as long as it is not aluminum. I have run 7.33 and 4.11 with my powerglide. I have heard some running a 4.22 gear as well.

Title: Re: bako hobby rear end ?
Post by W1CK3D R4C1NG on 09/18/09 at 7:20am

right on guys... thanks for the info... i'll let him know...

Title: Re: bako hobby rear end ?
Post by JOHNSON MOTORSPORTS 99 on 09/18/09 at 2:41pm

depends on the RPMs your looking for. i turn between 6600-7100 with my 411.

with a 733 running in drive you have to have a balanced drive line...

Title: Re: bako hobby rear end ?
Post by W1CK3D R4C1NG on 09/18/09 at 6:02pm

cool... thanks

Title: Re: bako hobby rear end ?
Post by TIM_BEWLEY on 09/19/09 at 8:49am

JOHNSON MOTORSPORTS 99 wrote on 09/18/09 at 2:41pm:

with a 733 running in drive you have to have a balanced drive line...

why not with the 411? please explain.

Title: Re: bako hobby rear end ?
Post by Dietzsch_Racing25 on 09/21/09 at 9:16am

TIM_BEWLEY wrote on 09/19/09 at 8:49am:

JOHNSON MOTORSPORTS 99 wrote on 09/18/09 at 2:41pm:

with a 733 running in drive you have to have a balanced drive line...

why not with the 411? please explain.

If you run in drive with a 7.33 rear gear the drive shaft is spinning at engine rpm (i.e. 6600-7100 rpm ). All the reduction is done with the rear gear.

If you run in first with a 4.11 rear gear the drive shaft is spinning much slower because the first reduction happened in the trans (1.82 or 1.76). In this case the drive shaft would be spinning at 3750 or 3626rpm (depending on 1st gear ratio), assuming 6600 engine rpm.

IMO the shaft should be balanced in either case but it is more critical if you're running in drive.

CD

Title: Re: bako hobby rear end ?
Post by JOHNSON MOTORSPORTS 99 on 09/21/09 at 10:54am

Dietzsch_Racing25 wrote on 09/21/09 at 9:16am:

TIM_BEWLEY wrote on 09/19/09 at 8:49am:

JOHNSON MOTORSPORTS 99 wrote on 09/18/09 at 2:41pm:

with a 733 running in drive you have to have a balanced drive line...

why not with the 411? please explain.

THIS IS EXACTLY RIGHT. IF YOU DONT BALANCE YOUR DRIVE SHAFT WITH A 7.33 AND RUN DRIVE YOU WILL BE PULLING YOUR TRANSMISSION OUT TO GET IT LOOKED AT BOUT EVER 3 TO 5 RACES.....AND ON TOP OF THAT THE DRIVER WILL NOT ENJOY THE VIBRATION TO GO ALONG WITH IT LOL.

4.11 WITHOUT A BALANCED BUT GOOD(NOT BENT OR ANYTHING) DRIVELINE YOU CAN STILL RUN THE WHOLE SEASON WITH A GILS TRANSMISSION POWERGLIDE WITHOUT NEEDING A REBUILD MID SEASON

Title: Re: bako hobby rear end ?
Post by TIM_BEWLEY on 09/21/09 at 4:36pm

Dietzsch_Racing25 wrote on 09/21/09 at 9:16am:

IMO the shaft should be balanced in either case

CD

this is my opinion also. you are just gambling if you run a non balanced driveshaft. but thanks for the indepth answers guys