Calling Shazam. . . Please Read
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Junior User
Joined: Sep 2002
Posts: 89
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From: Currently, Portsmouth, RI
Calling Shazam. . . Please Read
Sir,
I was pointed in this directionby a friend talking about building a hot 400. I've built many motors, and rebuilt one 400, but WAS NOT convinced until I read your posts about your pullin' truck. Anyway, I wanted to get your attention because you are teh only one I have read on here so far that I know for sure has a pullin' truck. If you would, would you please read my post entitled "question for truck pullin' guys" found in the transmission & rear end message board? I am sure that you can shed some light on the matter. . . Thanks.
Very Respectfully,
Nathan
I was pointed in this directionby a friend talking about building a hot 400. I've built many motors, and rebuilt one 400, but WAS NOT convinced until I read your posts about your pullin' truck. Anyway, I wanted to get your attention because you are teh only one I have read on here so far that I know for sure has a pullin' truck. If you would, would you please read my post entitled "question for truck pullin' guys" found in the transmission & rear end message board? I am sure that you can shed some light on the matter. . . Thanks.
Very Respectfully,
Nathan
Elder User
Joined: Feb 2001
Posts: 829
Likes: 0
From: Porterfield
Calling Shazam. . . Please Read
Hey All ..ShaZam here:
here's my set-up I don't think it'll help much because I pull 4 wheel drive but any info is better then none.
1978 4X4 Dana 60 front 4.55 gears Corp. rear 4.56 gears NP 435 Tranny with a 3.34 2nd gear And a NP 208 2 to 1 cast iron transfer case.I run 35" Tires in Super Stock and 34" in Mod.
Wheel Speed for my Pulling truck goes as follows.
6800 Rpm's 23.3 Mph
7200 Rpm's 24.6 Mph
8000 Rpm's 27.4 Mph
I pull in Low Range 2nd gear and this is what I learned this last season about tire speed and traction.
If I slipped my Clutch to the 100' mark on a good tight track and let everything get going with out spinning the tires I'd turn 6800 Rpm's all the way to the end and then I would spin out at the end. But I'd be really close to the 300' mark.
If I did everything the same but say got on it at the 75' mark I'd turn 7200 Rpm's and wouldn't finish that close to the end.
And let's say I just lost all since of reason and got on it right out of the hole,I'd turn 8200 Rpm's and I'd be lucky to make it to the 200' mark.
So I build a motor that will turn 8000 to 8500 Rpm's with out blinking and eye, And I have to learn to play with the throttle and keep it between 6800 and 7200 to be competative.
So the Keys to doing well is this.
Find out where your motor makes it most Torque and H.p. set your sights in the middle of the two, that will be your target Rpm.
Get yourself a real good Slipper Clutch. ( Mcleod or Crower )
and learn how to use it.
And I did a lot better at 23 Mph the I did at 27 Mph So I'd have to say 23 Mph is the target wheel speed.
If your going to use a Automatic Tranny look at getting a 3000 to 3500 Rpm Stall Converter. And build a motor with at least 850 to 950 H.p to be competative. With a Stick you could get by with 750 to 850 H.p.
Hope this helps
here's my set-up I don't think it'll help much because I pull 4 wheel drive but any info is better then none.
1978 4X4 Dana 60 front 4.55 gears Corp. rear 4.56 gears NP 435 Tranny with a 3.34 2nd gear And a NP 208 2 to 1 cast iron transfer case.I run 35" Tires in Super Stock and 34" in Mod.
Wheel Speed for my Pulling truck goes as follows.
6800 Rpm's 23.3 Mph
7200 Rpm's 24.6 Mph
8000 Rpm's 27.4 Mph
I pull in Low Range 2nd gear and this is what I learned this last season about tire speed and traction.
If I slipped my Clutch to the 100' mark on a good tight track and let everything get going with out spinning the tires I'd turn 6800 Rpm's all the way to the end and then I would spin out at the end. But I'd be really close to the 300' mark.
If I did everything the same but say got on it at the 75' mark I'd turn 7200 Rpm's and wouldn't finish that close to the end.
And let's say I just lost all since of reason and got on it right out of the hole,I'd turn 8200 Rpm's and I'd be lucky to make it to the 200' mark.
So I build a motor that will turn 8000 to 8500 Rpm's with out blinking and eye, And I have to learn to play with the throttle and keep it between 6800 and 7200 to be competative.
So the Keys to doing well is this.
Find out where your motor makes it most Torque and H.p. set your sights in the middle of the two, that will be your target Rpm.
Get yourself a real good Slipper Clutch. ( Mcleod or Crower )
and learn how to use it.
And I did a lot better at 23 Mph the I did at 27 Mph So I'd have to say 23 Mph is the target wheel speed.
If your going to use a Automatic Tranny look at getting a 3000 to 3500 Rpm Stall Converter. And build a motor with at least 850 to 950 H.p to be competative. With a Stick you could get by with 750 to 850 H.p.
Hope this helps
