Author Topic: sprag or spragless?  (Read 2665 times)

Offline spitzerscott

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sprag or spragless?
« on: September 20, 2018, 04:07:04 PM »
 Here it is , I'm looking at converters.  We have a 1500# R.E.D.  336 c.i. chevy, we are going to leave the line at 5000-5500, we have a 4:10 gear, so let's hear it.  Sprag or Spragless. We do drive the car to the lanes and back to the pits.  Let me have it!!!!

Offline jeff/21

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Re: sprag or spragless?
« Reply #1 on: September 20, 2018, 05:45:35 PM »
how big are your tires ? your running 366" and only 4:10 gears? as for the converter talk to your guy I have only run sprag type with small motors.

Offline BK

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Re: sprag or spragless?
« Reply #2 on: September 21, 2018, 05:28:36 AM »
I would think sprag. Your going to need all the torque multiplication you can get.

Offline gregm784

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Re: sprag or spragless?
« Reply #3 on: September 21, 2018, 08:57:27 AM »
I've run 331 - 387" blown motors.  4.10 gear, 32" tire, 1910# car.   Every converter guy i know says i don't need a spragless.  I took the sprag out years ago, saw no change in performance.  It repeats very well without it. 

we run a 7.60 index btw.

Greg
El Dorado County, CA
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Offline JrFuel Hayden

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Re: sprag or spragless?
« Reply #4 on: September 21, 2018, 09:35:51 AM »
Yes, our coverter people have said don't run spragless. We run 7.0's @ 188-190 mph with injected alky 400 ci SBC, weighing 1435 lbs
Greg I did not know you are at 1910 lbs, and don't you run the 12" NTF tires, are they only 32" tall ?
Hope to see you at CHRR.

Jon
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Offline spitzerscott

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Re: sprag or spragless?
« Reply #5 on: September 21, 2018, 04:56:04 PM »
Tires are 14.5x32 and the 4.10 gear is what was in it.  Most good race converters say, heavy duty sprag.    Thanks Guys.

Offline bikeguy307

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Re: sprag or spragless?
« Reply #6 on: September 21, 2018, 07:31:06 PM »
Every combo is different. Some work better with some without and some it seems to make no difference. Talk to your converter people and see what they say. In a perfect world we could try both and see what works best.

Offline gregm784

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Re: sprag or spragless?
« Reply #7 on: September 23, 2018, 08:45:18 AM »
Yes, our coverter people have said don't run spragless. We run 7.0's @ 188-190 mph with injected alky 400 ci SBC, weighing 1435 lbs
Greg I did not know you are at 1910 lbs, and don't you run the 12" NTF tires, are they only 32" tall ?
Hope to see you at CHRR.

Jon

I have the 13.00x16 NTF tire, it's 101", works out to about 32" tall.
Greg
El Dorado County, CA
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Offline jeff/21

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Re: sprag or spragless?
« Reply #8 on: September 23, 2018, 05:05:45 PM »
spitzerscott is your 336 blown or NA?

Offline spitzerscott

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Re: sprag or spragless?
« Reply #9 on: September 29, 2018, 07:15:04 AM »
jeff21,  N/A  850 Quick Fuel alcohol carb.

Offline jeff/21

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Re: sprag or spragless?
« Reply #10 on: September 29, 2018, 08:30:55 PM »
ran 160 " fed 406 sbc with a 850 33x10.5 hoosiers ran 4.86 gears slowed when we changed to 4.10 now changed from the carb to injection have yet to race it since the  need a new block cracked in the rear camshaft and life has gotten in the way. all the big blocks ran 4.10 or 3.90 gears

Offline gregm784

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Re: sprag or spragless?
« Reply #11 on: October 01, 2018, 03:22:10 PM »
I broke a stator last month in my old trusty converter, so i had it cut apart to take a peak. 

Years ago, i had PDQ converters in Sacramento remove the sprag and go spragless.

Found out Friday, that they never did what i paid them to do, and my sprag was indeed slipping. 

PDQ sux.
Greg
El Dorado County, CA
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