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Justin82 
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Joined: 09 Sep 2015
Location: Pa
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 Topic: wd engine and marvel carb
Posted: 09 Sep 2015 at 8:30pm |
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hello to all,
new member here that needs advice. I am running a wd motor with a 45 crank 4.125 flat top pistons and custom cam. I want to run 2 gear in 4500 class with 14.9x28 tires. should I stroke to 5" and cut the pistons or go with a different combo. The carb is a marvel with no ID tag, the air intake has a 1 5/8" ID if this helps. I built this motor 13 years ago and stopped pulling after 3 years until now so I cant remember the cam specs. The cam was done T.Richardson in NC. or SC.
Thanks for all your help.
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BennyLumpkin
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Joined: 22 Mar 2010
Location: Centre Hall, PA
Points: 2657
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Posted: 09 Sep 2015 at 9:10pm |
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Any reason in particular you want to run second? Not paced pulling?
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Central PA Allis Express
1934 WC254
1945 WF
1945 WC135755
1951 WD68085
1953 WD45-150217
1957 WD45D-230744D
B110
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Justin82
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Joined: 09 Sep 2015
Location: Pa
Points: 7
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Posted: 09 Sep 2015 at 9:19pm |
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Yes some pulls are divided in to divisions and I would just like to trie something different.
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Brampton 02 gt
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Joined: 07 Apr 2011
Location: Erin,ON, Canada
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Posted: 09 Sep 2015 at 9:59pm |
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I would think you could run second with that combo and spin out more often than not. Is it dying in second?
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Justin82
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Posted: 10 Sep 2015 at 2:57pm |
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Yes it will die out in second but will not die out in first even standing on the brakes. I am just looking for that extra hp in second but not go to radical on the engine.
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DrAllis
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Joined: 12 Sep 2009
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Posted: 10 Sep 2015 at 3:51pm |
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What does a cranking compression test reveal for numbers??????
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Justin82
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Posted: 10 Sep 2015 at 7:31pm |
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I have not done a compression test yet but I will and let you know. Is there any way to tell witch marvel you have by appearance or measurements? When I bought it from an old allis dealer used I was told it was a gleaner carb. It also has electronic ignition from Denny's carb shop if that makes a difference.
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mgburchard
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Joined: 14 Sep 2009
Location: Tennessee
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Posted: 11 Sep 2015 at 9:39am |
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Jt ran a usx series carb on his allis .
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mgburchard
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Posted: 11 Sep 2015 at 9:45am |
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If you have a Facebook account go to allis wc @ wd pulling engines. You will find a fellow by the name of Brian Morrison there he does what your wanting to do but does it in third gear with 38 tire
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Charlie175
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Joined: 11 Sep 2009
Location: Shenandoah, VA
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Posted: 11 Sep 2015 at 9:46am |
Like a USX21 from a JD? You are being cryptic
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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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mgburchard
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Posted: 11 Sep 2015 at 10:14am |
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Like Oliver usx 29 think the deeres a 21
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Justin82
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Posted: 11 Sep 2015 at 5:56pm |
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Did a compression test tonight and 150psi across the board.
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DrAllis
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Posted: 11 Sep 2015 at 9:54pm |
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150 psi isn't much when it comes to pulling. A standard D-17 engine has 145 psi per AC Service book. A standard 170-175 engine is 170 psi or a little more. You could stroke your engine provided there is no ring edge in the sleeves, and get that compression up to 240-260 psi would help a bunch. Might want to consider using newer connecting rods from a late D-17 or 170 or have yours heat treated.
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Justin82
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Posted: 12 Sep 2015 at 10:40am |
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If I get my rods heat treated what Rockwell do you recommend, and would I have to do any machining on them or would they maintain their tolerance?
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