Pulling Forum - Can I turn them

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Can I turn them

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Forum Name: Pulling Forum
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URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=85062
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Topic: Can I turn them

Posted By: Zaddison
Subject: Can I turn them
Date Posted: 18 Feb 2014 at 7:26pm

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

Replies:

Posted By: WCCLASON
Date 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.

Posted By: mufflerboltz
Date Posted: 18 Feb 2014 at 7:51pm

Give it shot, if they don't work out you're not out anything

Posted By: Zaddison
Date Posted: 18 Feb 2014 at 8:02pm

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.

Posted By: ac boy
Date Posted: 18 Feb 2014 at 8:20pm

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

Posted By: patrickmull
Date Posted: 18 Feb 2014 at 8:21pm

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

Posted By: Zaddison
Date Posted: 18 Feb 2014 at 8:24pm

3500 to 4000, some are first gear only but most are 4 mph.

Posted By: Zaddison
Date Posted: 18 Feb 2014 at 8:28pm

We pull at jerseyville, shumway, clarksburg, altamont and a few other closer to home.

Posted By: patrickmull
Date Posted: 18 Feb 2014 at 8:34pm

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

Posted By: Zaddison
Date Posted: 18 Feb 2014 at 8:37pm

I forgot cerro gordo we go to it I'd like to drive down and pull at Casey at least once this year.

Posted By: patrickmull
Date Posted: 18 Feb 2014 at 8:41pm

when we get the schedule done i will get you one

Posted By: cwhit
Date Posted: 18 Feb 2014 at 9:58pm

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.

Posted By: SteveM C/IL
Date Posted: 20 Feb 2014 at 7:22pm

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?

Posted By: Big Orange
Date Posted: 01 Mar 2014 at 10:33pm

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

Posted By: Zaddison
Date Posted: 09 Mar 2014 at 10:48pm

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?

Posted By: patrickmull
Date Posted: 09 Mar 2014 at 11:07pm

go here and use the shop math link it will be helpful http://www.murphysmotorservice.com/" rel="nofollow - http://www.murphysmotorservice.com/ sorry wrong one try this one http://www.rbracing-rsr.com/compstaticcalc.html" rel="nofollow - http://www.rbracing-rsr.com/compstaticcalc.html enter 0 onpiston top it will get you the right number

Posted By: Zaddison
Date Posted: 09 Mar 2014 at 11:26pm

I came up with 11.18:1 for the compression. What about the valves it won't hit them will it.

Posted By: patrickmull
Date Posted: 09 Mar 2014 at 11:31pm

mine is a little closer they don't hit

Posted By: WCCLASON
Date Posted: 10 Mar 2014 at 12:32pm

That gap is fine. You wont have any clearance problems there.

Posted By: Zaddison
Date Posted: 10 Mar 2014 at 1:55pm

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

Posted By: WCCLASON
Date 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.