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Old 10-11-2005, 12:49 PM
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B Mod circle track engine

I know this is more of a hot rod forum that racing, but i have a feeling there are some people here that could answer my question. There are a few modified circle track cars for sale here locally, and we want to build an engine that would be B mod legal. This means no roller cam or aluminum heads and a 500 CFM 2 barrel. I have only been around street performance and all out race engines. There for i am unsure of things such as , how big intake runners on heads, cam size and duration, hydro or flat tappet? I guess what i am asking is what would it take to be competitive in a b mod.

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Old 10-11-2005, 01:46 PM
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PM me, I might be able to help.
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Old 10-11-2005, 01:48 PM
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what size track(s) and what iron heads do they allow? Compression ratio rule? Cam lift rule?
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Old 10-11-2005, 02:26 PM
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Race rules

We will need to know more about your race rules in your organization, then we can have a better idea of what to reccommend..

OMT
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I have tried most all of it and now do what is known to work..
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Old 10-11-2005, 02:27 PM
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3/8 - 1/2 mile tracks, As far as i know any iron head will work, no compression limit, no roller cams- i dont think there is a limit to lift or duration, or a vaccum check. I would like to use The new Bowtie vortec heads, but i am unsure which port size would be more apropriate, i am thinking the smaller version. I see imca forbids 400 blocks, so the 406 or 377 is out.
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Old 10-11-2005, 05:02 PM
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Without a doubt, especially with the 1/2 mile track, you want a big head. We are running resticted, and unrestricted motors with ported heads in the 220 range. A Vortec is a good head but a stock 170cc runner is not going like running in the 7000 to 7500 RPM range like the competative motors do. It will fall on it's face. Big head, 255-260+ degree duration, .650+ lift, big rockers, 43 lb crank with 1500 gram bob and lots of secret work on the intakes.
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Old 10-11-2005, 08:34 PM
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RickWI, the new Bowtie Vortecs can be had with 200cc and I believe 180cc ports as well.
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Old 10-11-2005, 09:34 PM
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That is correct. If you can run a 200cc Vortec that would be an option. If you can run a big Iron Eagle Platnium, even better. If you can port an Iron Eagle that's better still.
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Old 10-11-2005, 09:40 PM
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The Bowtie vortec 206 heads are superior to the iron eagle heads, of the same size range. at .600 lift they flow 263 cfm out of the box. Can you run a cam that big that is a non roller? What kind of compression would you run 12:1 or so?
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Old 10-11-2005, 10:37 PM
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Superior is a strong word. Make sure you see that flow number for yourself while the head is being flowed. The Iron Eagles make power, we do lots of work with these heads. The 180 we get flowing around 302 and the 200+ runner heads over 320. A stock 200 Platnium is in the 275 range. The small chamber Iron Eagle is an awesome head.

Yes you can get the lift with a flat tappet cam, we use Crower 1.7's and 1.8 rockers on the top motors. I'd not suggest going much over 12:1 unless you are exceptionally good at staying on top of the tuneup as well as keeping control over engine temps. Potential detonation issues are the reason.
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Old 10-12-2005, 08:13 AM
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You don't need that much engine around here to run with the pack. Any Dart headed, solid cammed 355ci with 12:1 compression will get you through the year. When you learn to flat foot it, then you can worry about your engine program. About 85% of the teams around here know nothing about the chassis other than what the manufactur tells them. That's leaves a great big hole between huge engines and getting a chassis to work for you.
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Old 10-12-2005, 06:41 PM
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More Hp + bad chassis set up = how big of a hole do you want to put into the fence.

As ongrass1 said concentrate on the chassis and you will be better then most of your competitors.And build a solid engine that will last all year and don,t get real trick.
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Old 10-13-2005, 12:03 AM
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You said...... "as far as I know" ...... .....

Geez guy, go get a rule book and stop guessing..
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