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Allis Chalmers Discussion Forum
:

getting close and anxious on 45 pulling motor

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mlpankey

07-22-2009 17:18:46




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had some setbacks had machinist friend get hurt while machinig on it but were down to valve springs an titanium retainers to assembling a 403 cubic inch four cylinder based off the d17 226 gas block. I hope all the aggrevation and chasing parts to work in it pays off . I am really pleased that we reduced the valve weight from stock 250 grams to aftermarket valves of 90 grams. cant say i will ever do a 4 3/4 bore again or make billet main caps ever again either. oh well just thought i would post what ive been doing this summer.

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MHudson

07-24-2009 09:11:36




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 Re: getting close and anxious on 45 pulling motor in reply to mlpankey, 07-22-2009 17:18:46  
Gonna have that thing at Carthage TN in a couple of weeks?

We'll be looking for you.



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BDT in Minnesota

07-23-2009 18:30:05




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 Re: getting close and anxious on 45 pulling motor in reply to mlpankey, 07-22-2009 17:18:46  
Sounds like a real bear!! Just for fun, You wouldn't have given thought to putting that motor in an unstyled WC with a hand crank..?? grin...Good luck at the pulls with the WD95!!

BDT



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onjack

07-23-2009 17:54:19




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 Re: getting close and anxious on 45 pulling motor in reply to mlpankey, 07-22-2009 17:18:46  
Did you have the stroker crank made special or where do you get one? How much clearance do you have laterally and above the crank with that much stroke? Given your displacement and bore I calculated the stroke to be 5.6855 inches.



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Aaron SEIA

07-23-2009 16:09:06




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 Re: getting close and anxious on 45 pulling motor in reply to mlpankey, 07-22-2009 17:18:46  
For those of us that don't know much about the internals of pullers, a couple of questions. How does 403 ci compare to other 226 based engines size wise? Also, why was valve weight so critical? You just have it turning that fast or is there something else to light weight valves? I'd love to see some pictures of the engine build if you've got any. Need to get some video on Youtube when it gets hooked up.

Aaron SEIA

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Cheesehead Fred

07-22-2009 19:59:57




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 Re: getting close and anxious on 45 pulling motor in reply to mlpankey, 07-22-2009 17:18:46  
I'd really like to hear this one pull - been a fan of Orange since the third grade. Any chance you let us all know when you"re ready to put it to the test?? Thanks!



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mlpankey

07-23-2009 09:30:55




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 Re: getting close and anxious on 45 pulling motor in reply to Cheesehead Fred, 07-22-2009 19:59:57  
Sure will wither its a terd or a bear were gonna pull it .



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mlpankey

07-27-2009 13:49:14




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 Re: getting close and anxious on 45 pulling motor in reply to mlpankey, 07-23-2009 09:30:55  
hudson i doubt i will be up by then I have not oring the block yet. Putting a few heat cycles through the block to get the sleeves to fall as much as they are going to before final decking and oringing. the stroke has clearance issues oil pan rail oilpan camshaft bottom of sleeves etc but its worth the extra cubes . the stock valves are extremely heavy and restrict air flow we went with larger diameter valve head size and two sizes smaller stems . we were concerned with weight for two reasons throttle acceleration and the cam is hollow so lessoning the load allowed us to turn the base circle on the cam down increasing valve lift to squeeze every cfm we could from the intake ports. hope i answered everybody if i didnt reply ill try again.

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