Murphy rollor rockers
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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=115802
Printed Date: 20 Sep 2024 at 8:17pm
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Topic: Murphy rollor rockers
Posted By: Fields
Subject: Murphy rollor rockers
Date Posted: 06 Dec 2015 at 9:08pm
| Been tossing the idea around of upgrading to rollor rockers. In a 241 inch wd45 cr of say 10.0 to 1 running 2000 rpms. Will they inproved the performance enough to justify the cost. |
Replies:
Posted By: dgerth
Date Posted: 06 Dec 2015 at 10:08pm
|
Well I think so with my WD. Justification for the expense is your call, but it sure helped my ol girl! dgerth
|
Posted By: Zaddison
Date Posted: 06 Dec 2015 at 11:51pm
| Wondered the same thing myself. They are pretty pricey for a allis. |
Posted By: DrAllis
Date Posted: 07 Dec 2015 at 7:02am
| Unless the rocker arm ratio is different, I wouldn't spend my $$$$$ on something like that...2,000 RPM?? really.....8,000 RPM maybe. |
Posted By: Fields
Date Posted: 08 Dec 2015 at 11:54am
| if i'm right stock is 1.46 and rollers are 1.85. |
Posted By: injpumpEd
Date Posted: 08 Dec 2015 at 12:45pm
|
just make sure you have enough piston to valve clearance. ------------- 210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers! |
Posted By: Zaddison
Date Posted: 08 Dec 2015 at 1:13pm
| how far do the stock valves open |
Posted By: Fields
Date Posted: 10 Dec 2015 at 12:05pm
| my one cam card says .316 cam lift. |
Posted By: Zaddison
Date Posted: 10 Dec 2015 at 9:20pm
| I talked to Jeff at murphys yesterday and he said 10%-15% gain in horsepower. $430 and a hour of your time to install them isn't bad for even 10% in my eyes. |
Posted By: nborga87
Date Posted: 12 Dec 2015 at 6:58pm
| i had some in a 260 ci 10.5:1 wd 45 i think the performance was well worth the money and the quality of murphys stuff is top notch |
Posted By: Fields
Date Posted: 13 Dec 2015 at 7:46am
| Is the 260 inch a noticeable increase over the 240 set up. 5ossed the idea around of doing either one. |
Posted By: TennMatt1
Date Posted: 13 Dec 2015 at 10:10pm
|
I think I'm gonna get a set but I've been looking at some different cam grinds as well. Gotta do some measuring as well. A friend of mine put a set in his engine and didn't account for valve clearance...Lots of damage. ------------- 1954 WD45 |
Posted By: mattb
Date Posted: 15 Dec 2015 at 1:00pm
| I cut the pushrod side of my rocker arms down and welded them back together gained .080 of lift at the valves |
Posted By: alchpuller
Date Posted: 17 Dec 2015 at 10:42pm
Posted By: alchpuller
Date Posted: 17 Dec 2015 at 10:52pm
| Cut the rockers on the push rod size, shorten the , width of a chap saw blade,I built a jig for conforminity, worked good with a short head, the push rod holes need reworked on tall head.you will notice the difference in power. |
Posted By: MACK
Date Posted: 20 Dec 2015 at 6:32am
| Would be more gain if he made them with bearings in them. I tried putting bearings in them, but his hole tollerence was so far off that some was too loose for bearings even with Loctit. MACK |
Posted By: patrickmull
Date Posted: 20 Dec 2015 at 2:31pm
|
alchpuller are you cutting them and welding them back together |
Posted By: wi50
Date Posted: 20 Dec 2015 at 6:00pm
|
I used some IH 361 and 407 diesel rocker arms long ago. They are a 1.65 ratio. I don't rember if I had to hone the rockers slightly to fit the allis shaft, or if I used the IH shaft and made the rocker posts / mounts. ------------- "see what happens when you have no practical experience doing something...... you end up playing with calculators and looking stupid on the internet" |
Posted By: alchpuller
Date Posted: 28 Dec 2015 at 4:09pm
|
Be careful when welding the rocker that it does not get too hot, bearing material will melt, keep a spray bottle with water handy, do not get in a hurry when welding, you will have about 1.65 ratio, The cut rockers will give about the same results as a cam change. |
Posted By: Big Orange
Date Posted: 05 Jan 2016 at 6:27pm
| Has anybody on hear tried Murphy's 1.75 rockers in a 426, without fly cutting the pistons? |
Posted By: injpumpEd
Date Posted: 06 Jan 2016 at 12:34pm
|
I know of one guy who did, and said they were very close with a stock cam. Put a ground cam in then definitely need valve reliefs. I keep the heavy duty pushrods for the 426 in stock. They are still 3/8" diameter, so they drop right in. they are made by Smith Bros. to my specs. ------------- 210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers! |
Posted By: Big Orange
Date Posted: 06 Jan 2016 at 5:26pm
| Ed I wonder just how close, is safe for stock 2,200 RPMs, maybe .040 ? As this tractor is a field tractor not a puller. as you know ACs smoke a lot in the field, and the injection timing has to be faster to help with the smoke. ACs use a 1.45 rocker arm ratio, while JDs & IHs use 1.6 to 1.7 & the injection is a lot slower with no smoke. that's the reason i am trying the 1.75 rockers. |
Posted By: mgburchard
Date Posted: 06 Jan 2016 at 6:06pm
| One should open the lash.001 for every point of rocker ratio increase . |
Posted By: NEVER green
Date Posted: 06 Jan 2016 at 7:25pm
I put them in with a stock cam and at 3000 plus rpms bent several stock pushrods, intake and ex. ------------- 2-8050 1-7080 6080 D-19 modelE & A 7040 R50 |
Big Orange wrote: