ALLIS D21 ENGINE August 29, 2019 12:18AM
I got D21 with 670i engine that was built years ago by a builder whos no longer available, its stock stroke but has 4.625 bore... 504cubic inch... I cant figure out what they used for sleeve and pistons.. and did they use allis rods and bore out for a larger wrist pin?? unfortunately its been years tore apart and I don't have old rods or pistons just a couple sleeves... any thoughts?? thanks..
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Re: ALLIS D21 ENGINE August 29, 2019 03:46AM
Case 504 insides.
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Re: ALLIS D21 ENGINE August 29, 2019 04:01AM
wrist pins larger on case pistons... I assume machine allis rods out to fit is ok?
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Re: ALLIS D21 ENGINE August 29, 2019 04:44AM
where can I find hardened 426 rods machined out to fit case pistons? believe that's a 1.80 pin size..
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Re: ALLIS D21 ENGINE August 29, 2019 09:16AM
For pistons get them made from Diamond racing products they will help design and make custom pistons. There phone number is 5867926620 and I think I was talking to Evan when I ordered mine. Nowadays piston bowl design is very important including depth radius and diameter. A good thing to do is to talk to either Mark or your dyno guy that u will be using after you get your motor together. Dyno guys usually have a design that will work good for whatever class you are going for. Good Luck with your build
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Re: ALLIS D21 ENGINE August 29, 2019 05:31AM
2290 & 2294 Case pistons use a 1-5/8" wrist pin.
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Re: ALLIS D21 ENGINE August 29, 2019 05:33AM
THANKS
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Re: ALLIS D21 ENGINE August 29, 2019 06:08AM
At 670i engine will have the big pin rods in it. 1.75” wrist pins. Just get a set of pistons made if you have to. Mark Gettinger probably has rods and can help with anything else +1 (765) 977-8348



Edited 3 time(s). Last edit at 08/29/2019 06:10AM by 8030acpuller.
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Re: ALLIS D21 ENGINE August 29, 2019 06:22AM
COOL THANKS
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