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Allis Chalmers Discussion Forum
:

C-CA govoner spring

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jk

02-05-2008 12:18:34




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ina question a few weeks ago, about the top speed of a C, some said that if the gov. spring was changed to a CA spring, it would increase the speed, and would odvously the engine RPM. my question is, with that spring kick the RPM's up to 1650, so the C would have the same horse power as the CA? i don't mind the speed, but i'd like to free up the free power thats already there, i'm just looking for the easest, fastest way. i heard the same thing about changing it to a D17 (series 4) spring also. i was told and and don't understand how tighting the piviot on the govoner houseing will increase the RPM's. if anyone knows how that works could you explain it to me? thank you. jk

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mlpankey

02-11-2008 05:50:17




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 Re: C-CA govoner spring in reply to jk, 02-05-2008 12:18:34  
i stand corrected . b c and ca i thought had the same engine . my it manual doesnt show the heads combustion chamber. have a 140 cube torn down in garage now they have a flat head for sure . guess you cant make a 140 by overboring a ca . two different .



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steve in AK

02-10-2008 17:30:20




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 Re: C-CA govoner spring in reply to hectorgemme, 02-05-2008 12:18:34  
Hello all, The "C" head has chambers and fly cutting the surface reduces chamber volume thus raises compresion...http://i150.photobucket.com/albums/s87/insalcha/PicturesfromSept_23download016-vi.jpg
Thanks!



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mlpankey

02-09-2008 17:58:50




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 Re: C-CA govoner spring in reply to jk, 02-05-2008 12:18:34  
the gov. has weigts that sling out with cintrifigal force that causes the spring to colapse causing the throttle rod to move toward closing the carburator. the more the spring rate the more cintrifigal force it takes to colapse it . giving you a higher idle which also to a extent keeps the engine from pulling down as low in rpms as the original spring does at full load but remember that all engines can be pulled down till they stall out if enough load is applied.

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mlpankey

02-09-2008 17:45:11




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 Re: C-CA govoner spring in reply to jk, 02-05-2008 12:18:34  
hate to bust youre bubble . dick but a flat head as ac use theres absolutely nothing performance wise accomplished by milling the cylinder head all that does is give you a flat surface for the gasket to seal on ac engines . also torgue and horsepower curve meet at 5252 on a dyno so turning up the rpms does help horsepower numbers.



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mlpankey

02-09-2008 17:38:57




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 Re: C-CA govoner spring in reply to jk, 02-05-2008 12:18:34  
use a d15 sprig instead of the ca spring on the c it made my sons ca really snappy . for the d17 use a e gleanor spring its good for 2200 rpms really wakes up a 226 . i have both springs if you have trouble finding them . i dont usually sell parts but i guess i could start.



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jk

02-10-2008 12:03:36




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 Re: C-CA govoner spring in reply to mlpankey, 02-09-2008 17:38:57  
would the spring need to be from a d15 series 1 or 2, or does it matter? i'll call my dealer tomarrow to see if they can still get it, but if you had one you wanted to part with, how much would you ask for it? thank you



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mlpankey

02-10-2008 16:37:31




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 Re: C-CA govoner spring in reply to jk, 02-10-2008 12:03:36  
i think the series 2 is the one with the 160 cube motor . its the one to ask for it turns 2200 rpms and pulls down to 1850 if i remember correctly my it manuals are at my shop. the spring from the 160 fit my sons ca fine and it takes weight to hold the front end down. really made that tractor peepy.



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DickL

02-05-2008 15:55:07




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 Re: C-CA govoner spring in reply to jk, 02-05-2008 12:18:34  
Sounds like confusion reigns.
D-17 is different and what works on that will not be the same and the B, C, or CA.
The CA spring will give you extra RPM. That will in fact give you a higher HP at that RPM and only that RPM. If you are doing a chore that does not pull down the RPM's you will have that HP but the moment the load brings the RPM's down the HP is not there. Real HP increases only come with an increase in cubic inches and or higher compression.(larger pistons, longer stroke, smaller combustion chamber)

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jk

02-07-2008 12:03:40




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 Re: C-CA govoner spring in reply to DickL, 02-05-2008 15:55:07  
Dick L
so then would the whole idea be kind of point less?



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DickL

02-07-2008 19:51:59




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 Re: C-CA govoner spring in reply to jk, 02-07-2008 12:03:40  
Nothing you do to your tractor is pointless. What you get from the change of spring is how you use the tractor. If you are using it to plow or fit ground you will see a little difference. You would see more by milling .100 off the head.
If you are going to a pulling contest you won't see any difference in distance with just the spring change. When I was pulling I had several different springs in my tool box. When someone else was running a higher RPM I made sure I matched it. It didn't do any good until I put in larger pistons and took .150 off the head.

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jk

02-08-2008 15:12:41




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 Re: C-CA govoner spring in reply to DickL, 02-07-2008 19:51:59  
i use it mostly for light tillage and plowing snow. i don't really use it that hard and the gov is already very "snappy" so maybe i'll leave it alone



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