Wd cam timing advance
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Category: Other Topics
Forum Name: Pulling Forum
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URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=182620
Printed Date: 23 Nov 2024 at 8:08am
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Topic: Wd cam timing advance
Posted By: bobutzinger
Subject: Wd cam timing advance
Date Posted: 18 Aug 2021 at 10:11pm
Built a pulling motor and put in a cam done by a gentleman named Barney in northern Ohio before he died. Was told by a fellow puller running the same to advance the cam one tooth. Anybody done this or know any info? Thanks Bob
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B,B with snap co,2-C,CA,WC FLAT TOP,WC,ED 40,2-WD,2-WD45,2-WD45D,D10,D12,D14,D15,D15II, D17,D17D-S1,D17D-S3,D17IV,D19D,180,185,190Xt III,200,7000,7010,7030,2-7060,7060PS-Cummins,7080,K2D,F2D,F3D,2-M2D
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Replies:
Posted By: Bill_MN
Date Posted: 14 Sep 2021 at 8:21pm
Somewhat old post but I did this when I rebuilt my WD engine, works great. Each tooth is 4 degrees if I remember right. Advancing one tooth increases your effective compression ratio without causing piston-valve interference on stock parts. I'm actually running WD45 crank with WD pistons so even closer to the valves and still no issues.
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1951 WD #78283, 1918 Case 28x50 Thresher #76738, Case Centennial B 2x16 Plow
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Posted By: bobutzinger
Date Posted: 14 Sep 2021 at 10:25pm
Yeah I have a 45 crank redone to run Buda rods. I have another 1 with stock cam advanced 1 tooth also. Was trying to find out if i needed to do that with a Barney Taylor cam that has been re-worked. Thanks Bob
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B,B with snap co,2-C,CA,WC FLAT TOP,WC,ED 40,2-WD,2-WD45,2-WD45D,D10,D12,D14,D15,D15II, D17,D17D-S1,D17D-S3,D17IV,D19D,180,185,190Xt III,200,7000,7010,7030,2-7060,7060PS-Cummins,7080,K2D,F2D,F3D,2-M2D
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Posted By: bsallis180
Date Posted: 15 Sep 2021 at 5:27am
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I’m not sure how advancing your cam will increased your compression ratio. On a cam you need more torque than advance it. If you need more rpm then retard it. If you have detonation then retard it.
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Posted By: PaulB
Date Posted: 15 Sep 2021 at 6:33am
The important thing is: What is the cam center line suppose to be??? You should have been told this by the one who reground the cam, getting it close is not always "good enough" and may end up being worse that a stock cam properly centered. A tooth (4 degrees) may be too much or not enough. Doing anything by guess work is just throwing darts.
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If it was fun to pull in LOW gear, I could have a John Deere.
Real pullers don't have speed limits.
If you can't make it GO... make it SHINY
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Posted By: Charlie175
Date Posted: 15 Sep 2021 at 6:54am
People make a slotted gear for the purpose of doing 1/2 tooth as 1 tooth may be too much
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Charlie
'48 B, '51 CA, '56 WD45 '61 D17, '63 D12, '65 D10 , '68 One-Ninety XTD
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Posted By: Bill_MN
Date Posted: 15 Sep 2021 at 7:02am
Yes on a custom cam like from Barney that won't apply, the old advancing a tooth thing is supposed to help on a stock cam and engine. A custom cam should already be set up properly at the normal timing marks.
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1951 WD #78283, 1918 Case 28x50 Thresher #76738, Case Centennial B 2x16 Plow
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Posted By: Robacpuller
Date Posted: 15 Sep 2021 at 10:24pm
My cam is a 4 master grind, Marty Nelson helped dial it in. Cam card was 107 from cam center line. We advanced it 1 tooth and a half. Marty made a half key to get it dialed in. Ground off old mark and re stamped it. Runs awsome. Guy in Spencer wisconsin ground it. Marty and him came up with grind. Best $150 I could have spent.
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Posted By: Robacpuller
Date Posted: 15 Sep 2021 at 10:26pm
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Forgot to say I have 400 cube motor.
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