mfg Posted March 26, 2022 Report Share Posted March 26, 2022 The difference in turns (lock to lock) between a Studebaker Avanti with and without power steering is ....?.... 1) 1/2 .....2) 1 ......3) 1 1/2 .......or 4) 2 Link to comment Share on other sites More sharing options...
pantera928 Posted March 26, 2022 Report Share Posted March 26, 2022 2) 1 Link to comment Share on other sites More sharing options...
64studeavanti Posted March 26, 2022 Report Share Posted March 26, 2022 According to shop manual, power steering is 3.5 and manual is 5, so 3)1 1/2 would be correct. Link to comment Share on other sites More sharing options...
mfg Posted March 26, 2022 Author Report Share Posted March 26, 2022 46 minutes ago, 64studeavanti said: According to shop manual, power steering is 3.5 and manual is 5, so 3)1 1/2 would be correct. Sorry, 1 1/2 turns is not correct Link to comment Share on other sites More sharing options...
mfg Posted March 26, 2022 Author Report Share Posted March 26, 2022 54 minutes ago, pantera928 said: 2) 1 CORRECTO! Link to comment Share on other sites More sharing options...
64studeavanti Posted March 26, 2022 Report Share Posted March 26, 2022 You disagree with shop manual? Link to comment Share on other sites More sharing options...
mfg Posted March 26, 2022 Author Report Share Posted March 26, 2022 (edited) 1 hour ago, 64studeavanti said: You disagree with shop manual? Well, you are not seeing the whole picture!......I too have the shop manual.......The problem here is sometimes Studebaker printed information can be inaccurate..(for example the erroneous factory information regnalbob posted the other day concerning transmission weights) What I have is a bulletin distributed by the Ross Gear & Tool Company. (In case you don't know, that company made the Studebaker Avanti's steering box) It reads: "Ross unit specified by Studebaker Avanti engineers requires only 3.5 turns from lock to lock for power steering and 4.5 turns for manual steering." I believe the definitive answer would be to rotate the steering wheel on two Studebaker Avantis...one with power steering and one without...and simply count the turns. In the meantime, the answer of ONE turn will stand! Edited March 26, 2022 by mfg Link to comment Share on other sites More sharing options...
64studeavanti Posted March 26, 2022 Report Share Posted March 26, 2022 Just for posterity sake, will you post the bulletin? I have been collecting most pubs relating to Avanti and I do not have that one. Link to comment Share on other sites More sharing options...
mfg Posted March 26, 2022 Author Report Share Posted March 26, 2022 1 minute ago, 64studeavanti said: Just for posterity sake, will you post the bulletin? I have been collecting most pubs relating to Avanti and I do not have that one. I'll give it some thought! Link to comment Share on other sites More sharing options...
64studeavanti Posted March 26, 2022 Report Share Posted March 26, 2022 FWIW, if the turn to turn is incorrect, then the ratios of 16:1 for power steering and 22:1 for manual must be incorrect as well since the math works for the published values of turn to turn and ratios. P.S. I do know that the ratios are slightly variable depending on how close you are to the high spot. Link to comment Share on other sites More sharing options...
mfg Posted March 26, 2022 Author Report Share Posted March 26, 2022 8 minutes ago, 64studeavanti said: FWIW, if the turn to turn is incorrect, then the ratios of 16:1 for power steering and 22:1 for manual must be incorrect as well since the math works for the published values of turn to turn and ratios. P.S. I do know that the ratios are slightly variable depending on how close you are to the high spot. Good info! Link to comment Share on other sites More sharing options...
64studeavanti Posted March 26, 2022 Report Share Posted March 26, 2022 Just checked my 64 Avanti with power steering. Lock to lock is just over 3.5 turns. So, that spec is correct. I do not have a manual box to compare to. Link to comment Share on other sites More sharing options...
mfg Posted March 27, 2022 Author Report Share Posted March 27, 2022 14 hours ago, 64studeavanti said: Just checked my 64 Avanti with power steering. Lock to lock is just over 3.5 turns. So, that spec is correct. I do not have a manual box to compare to. Yes, if someone who owns (or has access to) a Studebaker Avanti equipped with manual steering would take the time to count the steering wheel turns lock to lock... We will have a definite answer. Link to comment Share on other sites More sharing options...
64studeavanti Posted March 29, 2022 Report Share Posted March 29, 2022 Here is a copy of a service letter dated May 11, 1964. It shows the 16:1 and 22:1 steering ratios for the Ross SE 54 as used in the Avanti as well as the SL 54 used in the GT. FWIW, if you do the math, 16:1 comes out to about 3.5 turns lock to lock and 22:1 is about 5 turns. This corresponds to the data published in the shop manual. If there is any documentation that states differently, I would like to see it! Link to comment Share on other sites More sharing options...
mfg Posted March 30, 2022 Author Report Share Posted March 30, 2022 Still hoping an owner of a Stude Avanti with MANUAL steering will put this question to bed! Link to comment Share on other sites More sharing options...
64studeavanti Posted March 30, 2022 Report Share Posted March 30, 2022 I thought you had a document from TRW/Ross??? Link to comment Share on other sites More sharing options...
mfg Posted March 30, 2022 Author Report Share Posted March 30, 2022 (edited) 1 hour ago, 64studeavanti said: I thought you had a document from TRW/Ross??? I do!.....but that simply places one "document" against another "document"...I'm looking for 'real world' on this one!..... Even you understood that a cast iron case T-10 four speed transmission couldn't possibly weigh 5 lbs. less than a non-overdrive T-86! (regnalbob's "documents") Dated "documents" can sometimes be inaccurate!!! Edited March 30, 2022 by mfg Link to comment Share on other sites More sharing options...
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