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FrontEngineDragsters.Org Forum
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Front Engine Dragsters
(Moderator:
GlennLever
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direct drive
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Topic: direct drive (Read 2430 times)
Lomiler
Newbie
Posts: 2
Your Best Time: 13.5 @1/4 mile dragstrip
Your Engine: 1963 Oldsmobile 394 ci
Your Track: Pueblo West Motorsports
Your Vehicle: fed clone- mid 1950's to 1962- model Chassis Research
General Location: Rocky Mountains
direct drive
«
on:
October 29, 2023, 05:22:43 PM »
building a Chassis Research dragster clone, time frame trying for is approximately "1960" build, engine a OLDSMOBILE 394cu, 1963, Hilborn fuel injection
QUESTION,,,, date direct drive used?? What rear axle ratio's used??
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THE FRENCHTOWN FLYER
Sr. Member
Posts: 360
Your Best Time: 8.28@168 door; 9.00@147 6-cyl alt; 8.53@160 RED
Your Engine: 300 Ford six NA w/ crossflow and prod. heads
Your Track: Milan, Thompson
Your Vehicle: (3) Advanced Chassis altered , The Last Logghe altered, '30 RPU
General Location: North Coast
Re: direct drive
«
Reply #1 on:
October 30, 2023, 07:59:07 AM »
most top gas or fuel dragsters went to direct drive ( no trans) by the late 50's. Very few used a transmission in the 60's either. a few tried the torqumaster/auto trans but, they did not work well. By the very late 60s, some were experimenting with 2 speed planetary trans like Don Garlits.
late 50's early 60's... with NO blower with carbs or injectors needed a trans 2 & 3.. high gear
Here's further details:
https://www.jalopyjournal.com/forum/threads/vintage-dragster-transmissions.339287/
«
Last Edit: October 30, 2023, 08:02:40 AM by THE FRENCHTOWN FLYER
»
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JEFF/21C
Full Member
Posts: 122
Your Best Time: N/A
Your Engine: 306 SBC INJECTED ALKY
Your Track: NONE
Your Vehicle: 23 T ALTERED
General Location: eastern canada
Re: direct drive
«
Reply #2 on:
October 30, 2023, 12:56:17 PM »
do you have a manual bellhousing or scattershield OLDS had unique blocks and extended over the clutch or torque convertor. you could mount any 3 speed and rotate so shifter levers are on the top for more foot clearance . i started to make an adapter to mount a 4l60e to 371 BECAUSE I didn't like the ones that are available, just too many projects.
GOOD LUCK!
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denverflatheader
Sr. Member
Posts: 333
Re: direct drive
«
Reply #3 on:
October 30, 2023, 01:10:21 PM »
For your early 1960s time frame ¼ mile, we assume a few things for direct drive. Not modern drag slicks that circumference grows at higher rpms, so fixed 30 inch diameter slick. IR injected fuel 394ci Olds full race prepped engine at max 6700 rpm at stripe. Vehicle weight 1100 lbs. Elevation 4600 feet.
My overly optimistic guess as follows for rear axle ratios (depends on your race engine build):
MPH GEAR RATIO RPM
straight alky 125 4.29:1 6000
33% nitro 150 3.75:1 6300
75% nitro 175 3.42:1 6700
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JEFF/21C
Full Member
Posts: 122
Your Best Time: N/A
Your Engine: 306 SBC INJECTED ALKY
Your Track: NONE
Your Vehicle: 23 T ALTERED
General Location: eastern canada
Re: direct drive
«
Reply #4 on:
October 31, 2023, 07:44:41 AM »
do you have the complete motor and injection system?
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denverflatheader
Sr. Member
Posts: 333
Re: direct drive
«
Reply #5 on:
November 15, 2023, 12:32:11 PM »
Lomiler - I received your message. Correct, Denver area. Alan
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direct drive