426 camshaft
Printed From: Unofficial Allis
Category: Other Topics
Forum Name: Pulling Forum
Forum Description: Forum dedicated to Tractor and Garden Pulling
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=103464
Printed Date: 31 Oct 2025 at 5:34am
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Topic: 426 camshaft
Posted By: NEVER green
Subject: 426 camshaft
Date Posted: 19 Mar 2015 at 8:40am
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Just had my 426 camshaft reground for higher lift and longer duration by Colt cams. This was his first performance Allis cam. For all you pullers out there the exhaust side is very inefficient, bad lift and duration. He said intake was little better. By improving the exh it will spool up turbo much better. Since Colt put lot of development in cam he's looking for more business. ------------- 2-8050 1-7080 6080 D-19 modelE & A 7040 R50 |
Replies:
Posted By: Peterson
Date Posted: 19 Mar 2015 at 9:05am
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How much was the regrind? ------------- 7095-685I at 255hp, 8070-225HP,8050-210Hp,8030 with 155HP,220 with 670T engine with A-pump, 7580, 185 with 140HP, 2-6080's,6070, S4 D17,wd45,CA,st34 agco, S1 D17 with 3500MK2 |
Posted By: AC 7060
Date Posted: 19 Mar 2015 at 10:48am
| I also might be interested in a cam how much and what rpm range is it designed for |
Posted By: NEVER green
Date Posted: 19 Mar 2015 at 4:16pm
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375.00 for regrind, 108.00 for resurfacing 12 tappets. The cam is for 3000-4000 rpms. If you go to Colt cams web sight there is little more info. ------------- 2-8050 1-7080 6080 D-19 modelE & A 7040 R50 |
Posted By: Peterson
Date Posted: 20 Mar 2015 at 10:30am
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I would suppose you have to cut the pistons for valve clearance? Correct?or? ------------- 7095-685I at 255hp, 8070-225HP,8050-210Hp,8030 with 155HP,220 with 670T engine with A-pump, 7580, 185 with 140HP, 2-6080's,6070, S4 D17,wd45,CA,st34 agco, S1 D17 with 3500MK2 |
Posted By: NEVER green
Date Posted: 21 Mar 2015 at 8:10am
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Not sure about clearance, didnt go with huge lift to keep lugging ability, but Im going to check with playdo any way. ------------- 2-8050 1-7080 6080 D-19 modelE & A 7040 R50 |
Posted By: Peterson
Date Posted: 21 Mar 2015 at 8:17am
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Yeah I'd be really interested in seeing if it clears. I wonder if he could go alittle milder on profile for a farm/pulling tractor. Hmmmm... ------------- 7095-685I at 255hp, 8070-225HP,8050-210Hp,8030 with 155HP,220 with 670T engine with A-pump, 7580, 185 with 140HP, 2-6080's,6070, S4 D17,wd45,CA,st34 agco, S1 D17 with 3500MK2 |
Posted By: NEVER green
Date Posted: 21 Mar 2015 at 8:34am
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You could call him, very nice informative guy. ------------- 2-8050 1-7080 6080 D-19 modelE & A 7040 R50 |
Posted By: Peterson
Date Posted: 21 May 2015 at 7:16am
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Any update on this? Just curious. ------------- 7095-685I at 255hp, 8070-225HP,8050-210Hp,8030 with 155HP,220 with 670T engine with A-pump, 7580, 185 with 140HP, 2-6080's,6070, S4 D17,wd45,CA,st34 agco, S1 D17 with 3500MK2 |
Posted By: O.P.S. Heads
Date Posted: 21 May 2015 at 8:03am
| It is more than just lift that affects the piston to valve clearance. Durations and event timing have to be considered. If the reground cam has more duration and more lift than a stock cam I would guess you will need to machine the pistons for clearance. There wasn't much room with a factory cam in it. |
Posted By: NEVER green
Date Posted: 21 May 2015 at 8:44am
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Stupid farming, planting done, still picking rocks, in process of removing front of engine, will let you know. Soon??????? ------------- 2-8050 1-7080 6080 D-19 modelE & A 7040 R50 |
Posted By: DougG
Date Posted: 23 May 2015 at 8:13am
| I always wondered how you get a 301 diesel to run good at 3000 rpm limits , I kno they run real good at 4500 rpm,s ; someone told me get the cam reground- cheap power |
Posted By: NEVER green
Date Posted: 31 May 2015 at 4:45pm
Still not done picking rocks, but I did check those clearances. Intake at 090, Ex at 045, I noticed when I set the lash sure had tighten up the Ex lots more. Ive read for 6000 rpm motor clearance should be 080, would 060 work for 4000 rpm motor, thoughts? ------------- 2-8050 1-7080 6080 D-19 modelE & A 7040 R50 |
NEVER green wrote:Posted By: NEVER green
Date Posted: 31 May 2015 at 4:47pm
Yes duration was increased, especially Ex. ------------- 2-8050 1-7080 6080 D-19 modelE & A 7040 R50 |
Posted By: Peterson
Date Posted: 26 Aug 2015 at 8:24am
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Any updates? ------------- 7095-685I at 255hp, 8070-225HP,8050-210Hp,8030 with 155HP,220 with 670T engine with A-pump, 7580, 185 with 140HP, 2-6080's,6070, S4 D17,wd45,CA,st34 agco, S1 D17 with 3500MK2 |
Posted By: moblie120
Date Posted: 28 Aug 2015 at 2:19am
| This was his first performance Allis cam. For all you pullers out there the exhaust side is very inefficient, bad lift and duration. http://meizusale.com/" rel="nofollow - meizu m2 note |
Posted By: NEVER green
Date Posted: 03 Sep 2015 at 8:25am
Whats the deal with machinists?, are they all slow? Still waiting on my heads and block. ------------- 2-8050 1-7080 6080 D-19 modelE & A 7040 R50 |
Posted By: Peterson
Date Posted: 08 Jan 2016 at 5:20pm
Anything yet?  ------------- 7095-685I at 255hp, 8070-225HP,8050-210Hp,8030 with 155HP,220 with 670T engine with A-pump, 7580, 185 with 140HP, 2-6080's,6070, S4 D17,wd45,CA,st34 agco, S1 D17 with 3500MK2 |
Posted By: tbran
Date Posted: 08 Jan 2016 at 10:52pm
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IT would be neat for a cam mfg / grinder to do baseline tests with the old stock cam designed in the 60s for a naturally aspirated engine as in the 3400 and 2800 engines to see what the difference if any would be with a modern grind in the field use engines. If the change is significant, what a business one might have... ------------- When told "it's not the money,it's the principle", remember, it's always the money.. |
Posted By: Peterson
Date Posted: 09 Jan 2016 at 6:51am
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I think there would be a nice gain in the torque of the engine, plus run cooler too! ------------- 7095-685I at 255hp, 8070-225HP,8050-210Hp,8030 with 155HP,220 with 670T engine with A-pump, 7580, 185 with 140HP, 2-6080's,6070, S4 D17,wd45,CA,st34 agco, S1 D17 with 3500MK2 |
Posted By: NEVER green
Date Posted: 09 Jan 2016 at 4:17pm
Sigh, machinists latest is a death in his family, cant complain to him about that. Hope to have it running by spring???? ------------- 2-8050 1-7080 6080 D-19 modelE & A 7040 R50 |
Posted By: Big Orange
Date Posted: 10 Jan 2016 at 1:31pm
| A cam. grinding co. spec. is one thing, but the timing of the cam. in your engine,is another thing. The tolerances of the key ways in crank gears and cams gears, even the key slots in the crank & cam has an effect on timing. In my experience I have found the timing to very as much as 7 degrees, even on stock engines. That will make a lot of difference in the way an engine performs. So check the timing to make sure it's to spec. or advance it to gain low rpm power, retard for high rpm power. But always check the valve to piston Clarence. |
Posted By: Big Orange
Date Posted: 17 Jan 2016 at 5:43pm
| You may be able to gain what you need by advancing the stock cam, about 8 degrees with offset key & installing stiffer valve springs, most importantly 1.75:1 rocker arms, as the stock rocker arms are 1.48:1 + stronger pushrods. But be sure to check the valve to piston clearance. The rocket arms & pushrods can be bought from Murphy's Machine in Hallsville Mo. 573 696 3655 or Kenney's Pulling parts 606 379 7490 |
Posted By: CalSnider
Date Posted: 24 Jan 2016 at 8:48am
| is there anyone in the midwest that can grind a 426 cam shaft? |
Posted By: Peterson
Date Posted: 24 Jan 2016 at 10:14am
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No limit manufacturing in Marshfield wi ------------- 7095-685I at 255hp, 8070-225HP,8050-210Hp,8030 with 155HP,220 with 670T engine with A-pump, 7580, 185 with 140HP, 2-6080's,6070, S4 D17,wd45,CA,st34 agco, S1 D17 with 3500MK2 |
Posted By: Peterson
Date Posted: 02 Sep 2016 at 3:25pm
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Hate to be the one always asking, but any update? ------------- 7095-685I at 255hp, 8070-225HP,8050-210Hp,8030 with 155HP,220 with 670T engine with A-pump, 7580, 185 with 140HP, 2-6080's,6070, S4 D17,wd45,CA,st34 agco, S1 D17 with 3500MK2 |
Posted By: ac720nut
Date Posted: 14 Sep 2016 at 8:07pm
| Peterson, how's your ride coming? Lost track of your thread. |