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Zaddison 
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Joined: 19 Sep 2013
Location: Moweaqua il.
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 Topic: Can I turn them
Posted: 18 Feb 2014 at 7:26pm |
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I just built a motor for my wc 4 1/8 flat tops with a 45 crank, manifold and carb at about 10:1 compression at 1800rpm. My question is its got 14.9/24 on it which probably way to small and only other tires I have are 12.4/38 of my f20 to you guys think it will turn them. Also wondering about murphys roller rockers how much will they help on my motor if any. Thanks, Zeb
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WCCLASON
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Joined: 01 Jan 2010
Location: Viroqua Wi
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Posted: 18 Feb 2014 at 7:40pm |
i would think so. Guess it would depend on the track and the amount of grip your tires have.
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mufflerboltz
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Joined: 03 Oct 2012
Location: New Glarus, Wi
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Posted: 18 Feb 2014 at 7:51pm |
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Give it shot, if they don't work out you're not out anything
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Zaddison
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Location: Moweaqua il.
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Posted: 18 Feb 2014 at 8:02pm |
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I guess I should of told you what they are. Theyare Firestone field and road about half tread nice and sharp and hard so they should hook decent I'm hopping it'll turn them.
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ac boy
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Posted: 18 Feb 2014 at 8:20pm |
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is their a pace? and what weight? when I was antique pulling kind off had the same set up but in a wd. if your pulling 3500 you should be fine
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patrickmull
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Joined: 11 Jan 2011
Location: Casey IL
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Posted: 18 Feb 2014 at 8:21pm |
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where are you going to pull at/ at the rpm you have the roller rocker won't help you I would spend your money on things that give more HP
Edited by patrickmull - 18 Feb 2014 at 8:27pm
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Zaddison
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Posted: 18 Feb 2014 at 8:24pm |
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3500 to 4000, some are first gear only but most are 4 mph.
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Zaddison
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Posted: 18 Feb 2014 at 8:28pm |
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We pull at jerseyville, shumway, clarksburg, altamont and a few other closer to home.
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patrickmull
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Posted: 18 Feb 2014 at 8:34pm |
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i have pulled clarksburg i am going to try to hit shumway and altamont this year you've got cero gordo and deland up there you can try casey also
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Zaddison
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Posted: 18 Feb 2014 at 8:37pm |
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I forgot cerro gordo we go to it I'd like to drive down and pull at Casey at least once this year.
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patrickmull
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Posted: 18 Feb 2014 at 8:41pm |
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when we get the schedule done i will get you one
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cwhit
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Joined: 12 Sep 2009
Location: Sigel IL
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Posted: 18 Feb 2014 at 9:58pm |
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I think you'll be just fine with your 38s. If you run across some guys with a wide front WD 45 stop buy and visit. We usually get to both Shumway pulls and Altamont ,Clarksburg and a couple of Casey also.
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SteveM C/IL
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Joined: 12 Sep 2009
Location: Shelbyville IL
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Posted: 20 Feb 2014 at 7:22pm |
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Seems like I always have something I gotta work on during the Clarksburg pull.Shame since I'm only a mile south of there. Priorities?
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Big Orange
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Posted: 01 Mar 2014 at 10:33pm |
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IF YOU NEED MORE RPMS IN LOW GEAR TO GET THE HP, A [RC] RING & PINION IS GEARED LOWER , SOME GUYS USE THEM SO THEY CAN RUN 2nd IN THE LIGHT FAST CLASS. PS WITH 10:1 RATIO YOU WILL IN A LOT OF OCTANE. GOOD LUCKY THIS SUMMER
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Zaddison
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Posted: 09 Mar 2014 at 10:48pm |
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I put the pistons in the motor I'm building tonight. At tdc there is a 3/8 gap will this be to close to the head. If the piston is all the way up all the valves should be closed right I guess I just want to make sure that when one is up four doesn't hit any valves. At this gap I came up with about 11:1 does this sound about right?
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patrickmull
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Posted: 09 Mar 2014 at 11:07pm |
go here and use the shop math link it will be helpful http://www.murphysmotorservice.com/ sorry wrong one try this one http://www.rbracing-rsr.com/compstaticcalc.html enter 0 onpiston top it will get you the right number
Edited by patrickmull - 09 Mar 2014 at 11:14pm
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Zaddison
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Posted: 09 Mar 2014 at 11:26pm |
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I came up with 11.18:1 for the compression. What about the valves it won't hit them will it.
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patrickmull
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Posted: 09 Mar 2014 at 11:31pm |
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mine is a little closer they don't hit
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WCCLASON
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Posted: 10 Mar 2014 at 12:32pm |
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That gap is fine. You wont have any clearance problems there.
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Zaddison
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Posted: 10 Mar 2014 at 1:55pm |
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Late last night when I measured it i messed up I measured it today and it was 5/16 which came out to be like 12.86:1 on compression. Is this still ok on the gap. Thanks again, Zeb
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WCCLASON
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Posted: 10 Mar 2014 at 7:16pm |
Im not sure when you get down to that small, That just makes me think that is a really small chamber to have a good fuel/air mixtures and good ignition. Thats just me though. I ran a simular set up and i may not have had is set up well.. but i was not very happy with the outcome. I ended up rebuilding the motor again with a simple set up and i love how it pulls now. Sorry for the long story, Im sure someone else will tell you better but i just havent had good luck with really high compression setups. Good luck on the motor build. Would like to see the out come....Mine was running 248psi comp.
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