Will this kill my 904 ?

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moper said:
No offense but your problems are exactly why one switches to a glide. Let the convertor soften the launch and if needed tune it with convertor pressure if needed. The low gear first is too much for no rear suspension. I've also got a buddy with a slingshot running a blown Buick of all things. He uses the pulley size to adjust the hit. That's after bending the chassis on a really tall wheel stand. He's got a BOP TH350 in it. Weight wise, cost wise, a PG is what you need.
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I ran a 904 clutch auto back in the day and never had an issue. Now I have an 8" 5000 rpm converter and it's a tricky thing to get down the first 100 feet. I ran a PG in the early 1980's and it was like my first wife... a dull ride.
 
Yup. Dull and predictable... lol leave the crazy whores for the bedroom- not the track...lol
 
Retroboy said:
Gee a fair bit of love for my old bus !! Nar mo Taxi cab power glidel trans for this car. The 904 as fitted has no extension housing rather we chopped the output shaft off at the governor and use the govenor splines to hook into a home made coupler. There is no MSD 2 step to soften the launch. Just a traditional internal coil Vertex mag. Excluding the starter there is about 3' of wire in the car. I had thought about going to a 3.89 rear but I'm going through the engine at the minute (see my post in small block engines about MP forged pistons) so don't have anything resembling spare cash for gears. An other idea could be some type of damper on.the throttle to just ease the hit - I'm old but don't understand the easing into the throttle thing -my eyes just sort of roll back in my head when the engines running and the helmets on second last amber and smack the throttle. By the time I've let go of the brake lever and reached down to the shifter 1st gear is all used up. 38 years since my first pass in a slingshot or 39 years since my last pass in a tin top. Leaving in 2nd washes .4 off my et.
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Msd 2 step is rev limiter. Have a look at an msd power grid. I believe it can work with a magneto. You program in a timing curve that retards the timing at the hit which kills the torque to soften the hit, then ramp the timing back in whenever you want. It is fully adjustable. Works with any ignition system. You need a computer to program it. All those two step boxes etc are included if you want to use them, in the power grid, but I think the ability to adjust your timing curve would help your issue.
 
Duane said:
Msd 2 step is rev limiter. Have a look at an msd power grid. I believe it can work with a magneto. You program in a timing curve that retards the timing at the hit which kills the torque to soften the hit, then ramp the timing back in whenever you want. It is fully adjustable. Works with any ignition system. You need a computer to program it. All those two step boxes etc are included if you want to use them, in the power grid, but I think the ability to adjust your timing curve would help your issue.
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I'll check into it but this is only the second time Ive ever heard of a Power Grid. Kinda seems I'm out of ouch!
 
Retroboy said:
I'll check into it but this is only the second time Ive ever heard of a Power Grid. Kinda seems I'm out of ouch!
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It is nothing more than a digital timing control but this model works with your existing equipment.
You could put in a 2:74 low gear set in your 904 which will give you a second gear starting line ratio of 1:58 like a power glide. Use the cope transbrake or the transact that works in second gear if you want to stay away from electronics.
 
How about leaning "the other way?" Can you gear up the rear axle and use 1st/2nd?
 
Way to much gear for the weight and low first gear. I would think more on the lines of 3.73 rear. I had a similar problem with my 67 Super Gas Barracuda @2615 lbs and a 727 it would leave so hard I would break wheelie bars and then scrub the rear valance off. Even with 16x33x15 slicks and 4.88 gear. I lost more races in the first 60'.
Went to a 1.76 glide 4200 converter. Car would leave with front end 6-8" off the ground, 60 ft 1.25 and picked up 1/10 in the 1/8th. best of 5.74. And I started winning. Car was a pleasure to drive.
 
Retroboy said:
I ran a 904 clutch auto back in the day and never had an issue. Now I have an 8" 5000 rpm converter and it's a tricky thing to get down the first 100 feet. I ran a PG in the early 1980's and it was like my first wife... a dull ride.
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I ran a clutchflite in my 32 bantam altered nostalgia car. Injected hemi on alky, 100" wheelbase. Thats 254 centimeters to everybody else. 30 lb. flywheel added to the fun. Still have 2 of them transmissions sitting in a corner.
 
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