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Tractor Pulling Discussion Forum

Flat head v.s. cyclone head

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Geewiz

09-04-2004 05:02:39




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I am building a pulling "G". I've heard two differant ways to go, flat head and milled cyclone head. I've also heard flat heads crack easly. Need some more advice before investing money either way.




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buickanddeere

09-04-2004 09:44:13




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 Re: Flat head v.s. cyclone head in reply to Geewiz, 09-04-2004 05:02:39  
The flat head has to be pinned to keep combustion pressure from pushing through to the water jacket. The cyclone head shrouds 1/2 the intake valve to force air/fuel mixture swirl. Great for burning distillate or gas well drippings. But lousy for making high rpm HP on gasoline. With some careful measuring the "eyebrow" can be machined out about 3/16" to 1/4" away from the valve. Then a 45 degree transition machined on the eyebrow remaining towards the valve seat. Ports need cleaning up of casting flash, rough edges, valve guide and port match. Intake valves need to be back cut to a nail head shape. Can't do much about the very long and small diameter ports with the divider and dog leg way over to the valves. A cam and fresh followers from Boberts Carburetor does wonders too. Compression ratios depending on the cam, 8 or 9 to 1 at most. More comp makes only a little more power and requires much more octane. Should be able to build it and run fine on 94 octane pump gas.

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Geewiz

09-04-2004 12:17:39




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 Re: Flat head v.s. cyclone head in reply to buickanddeere, 09-04-2004 09:44:13  
Thanks for your input, I appreciate your help. Do mean raise the RPM of my "G" above 975 for more HP.? I was under the assumption not to mess with the RPM.


Thanks again, Geewiz



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JDGnut

09-04-2004 16:03:10




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 Re: Flat head v.s. cyclone head in reply to Geewiz, 09-04-2004 12:17:39  
Your RPM"s will usually be based on your rules.. but if they can be increased.. Increase them.. High idle is more than 975.. most rules are 10-20-30%.. On the head.. B&D gave most of the info.. the Flathead do tend to flex a little under high compression.. pinning the head helps with this.. The advantage of the flathead is the increased comression.. and it is easier to install bigger valves... These heads are getting a little harder to find.. but they are also being reproduced...
The styled... I do what B&D described.. Some like the flow of this head better... I can"t say one is better.. I have both styles.. but on very different engines... I guess it depends if you are going to stroke the engine, or just keep the stroke stock, and a little boring.. stock rods and pistons??? As you had said.. you have not taken the engine apart yet.. when you do.. measure everything.. distance from the top of the block to the piston at TDC and BDC.. Also CC the head while you have it off.. Good Luck
JDGnut

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Geewiz

09-04-2004 23:15:11




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 Re: Flat head v.s. cyclone head in reply to JDGnut, 09-04-2004 16:03:10  
No I am not going to stroke the engine. Planning on boring it .125 over, head work, carb work and a new cam.

What do you mean by high idle? I was under the impresion the governor kept the engine at 975 max.

When you speak of pinning, do you mean dowel the head and block together?

Thanks for your help, JBGnut. I am new at this and appreciate all the input.


Geewiz



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buickanddeere

09-06-2004 06:01:34




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 Re: Flat head v.s. cyclone head in reply to Geewiz, 09-04-2004 23:15:11  
All simple "proportional" control governor styles right from tractor engines to level controllers of nuclear power plant level and pressure controllers have "droop". That is the rpm; pressure, level etc have to drop from set point down about 5 to 15% before the governor fully opens. So the tractor has a fast idle of 1125rpm or so. It has to lug down to 975 rpm by the time the throttle blades are pulled wide open. Pinning the head means putting pins through the head's water jacket. This braces the combustion chamber surface from being pushed into the head's water jacket.

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