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Bracket Talk Bracket Talk Forum Tech Talk - by Abruzzi Crankshaft centerline heightGo | New | Find | Notify | Tools | Reply | |
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DRR Trophy |
Front clipping my car and thinking about lowering the engine in the car. What is a good spot to be for a 2400lb race ready car 50/50 weight bias? 632 1125hp and have the option of 1.80 or 1.65 glide, will be 4.56-4.86 rear gear 33x15 or 32x16 slick. Would it be different if running a 32x14 radial? Thanks in advance for any input. | ||
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| DRR Pro |
Because you are upgrading to a powerful engine and your car is relatively lightweight, your question is valid and important. I suggest finding other cars with similar performance and weight. Plus, maybe talk with chassis builders. I think good research by experienced builders is vital. Another, I have enjoyed a good relationship with Dave Connolley at Competitive Suspensions and Tod Bevis at Modern Race Cars. Larry Woodfin | |||
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| DRR Pro |
Another thing, Mr. Inferno: in my experience, a 1.80 Powerglide works very well across a wide range of conditions and packages. I think you will be leaving ET on the table with a lesser ratio. Larry Woodfin | |||
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DRR Trophy |
My 'fast' bracket car was a lot more efficient with 4.56 x 1.69 combination compared to 4.29 x 1.80 - the starting line ratio was basically the same, but the converter slippage out the back improved greatly - this was going 480 on HP and 430 - 445 on nitrous | |||
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| DRR Trophy |
I'm not changing engines. I will still be running the 632 that was in it before. I have ran both the transmissions in the car. The 60'was about .02 quicker with the 1.80 but pulled better in the middle with the 1.65. Overall the 1.80 was maybe .01 quicker. I ran them both with a 4.86 gear. With that said I was pulling some timing with the 1.80 that could probably put back in after getting the ssupension tuned in. | |||
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| DRR Sportsman |
1.80/4.86 is WAY over geared for 632 bracket car going 5.0's. | |||
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| DRR Trophy |
I agree. | |||
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| DRR Trophy |
Also have ran 4.57 and 4.29 gear and the 4.57 was basically no change in ET but the 4.29 slowed down roughly .07 and 2 mph. This how I ended up on the 4.86 gear with 1.65 glide.This message has been edited. Last edited by: inferno camaro, | |||
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| DRR Top Comp |
Maybe he's running 1/8th mile? . Dave F J B | |||
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| DRR Sportsman |
Which has zero to do with having way to much starting line ratio, and alot to do with the wheel stand causing a complete rebuild. | |||
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| DRR Trophy |
When it wheelied, it had the 4.56 and 1.65 low gear glide in it. | |||
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| DRR Top Comp |
I think I remember from the old days when straight axles and stuff were raising frontends more and more, that NHRA made a rule saying crank centerlines had a max of 24" from the ground.......The jacked up frontends were the rage because it was supposed to weight transfer for better traction.. This may or may not be relative to this conversation... . Dave F J B | |||
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| DRR Trophy |
Check overall driveline hight check pinion hight to ground this is important to keep driveline straight try to set crank c/l at same hight if its to low bring it up till you can live with it the straighter the better for overall lenght of w/b keep straight to pinion The difference between ignorance and stupidity. Ignorance is lack of knowledge. Stupidity is the inability to learn. Don't be stupid | |||
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Bracket Talk Bracket Talk Forum Tech Talk - by Abruzzi Crankshaft centerline height
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