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> 2270 Deck Height and CR, Pistons sitting proud of the deck, how many shims is too many shims?
vjb206
post Feb 26 2024, 03:52 PM
Post #21


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Hey folks! I have the bottom-end of my 2270 assembled and spinning freely. Thanks to all who helped me get to this point!

(IMG:http://www.914world.com/bbs2/uploads_offsite/media.giphy.com-23760-1708984357.1.gif)

To quickly recap: I bought the 2257 kit from AA Pistons (78mm stroke, 5.158" rods, etc.). And when I threw a P&C on for a test-fit last weekend, I immediately noticed the piston sitting proud of the deck height at TDC (negative deck) by about 2mm.

(IMG:http://www.914world.com/bbs2/uploads_offsite/media.giphy.com-23760-1708984358.2.gif)

Before I overreact, or buy the wrong stuff, I thought I'd ping the community...
  1. Is this normal for a stroker set-up?
  2. Can you stack multiple shims when getting up into the .06 >> .09 range?
  3. (If no-stack) What's the best place to have custom shims cut?
  4. I recall Jake saying using large shims requires lots of advance, anyone have experience here? What am I looking to adjust for upon start-up?

Once I figure out whether or not this is normal (I.E. verifying that I don't have to backtrack), I'll get into the CR questions (just waiting on clear plastic from Amazon so that I can measure my CC volume this weekend) (IMG:style_emoticons/default/biggrin.gif)

Thanks!
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vjb206   2270 Deck Height and CR   Feb 26 2024, 03:52 PM
Jack Standz   1. It's all in the combination, what pin heig...   Feb 26 2024, 08:23 PM
r_towle   Did you buy the long liners? I’m guessing those ...   Feb 26 2024, 08:32 PM
Jack Standz   Strokers are a lot of fun but also a lot more work...   Feb 26 2024, 08:38 PM
Krieger   Why don't you call AA and see what they have t...   Feb 27 2024, 12:16 AM
VaccaRabite   You are asking the wrong question. Stop everything...   Feb 27 2024, 06:54 AM
Montreal914   Read! Here, on Shoptalkforums, other places…...   Feb 27 2024, 11:30 AM
cgnj   @vjb206 That looks like my motor did. It is curr...   Feb 27 2024, 12:11 PM
MikeK   You can shim the cylinder base, use a copper gaske...   Feb 27 2024, 12:16 PM
Jack Standz   You can shim the cylinder base, use a copper gask...   Feb 27 2024, 01:03 PM
MikeK   You can shim the cylinder base, use a copper gas...   Feb 27 2024, 03:35 PM
vjb206   @MikeK great idea! Don't want any scoring...   Feb 27 2024, 01:02 PM
VaccaRabite   [b]@[url=http://www.914world.com/bbs2/index.php?...   Feb 29 2024, 07:08 AM
Jack Standz   There's more to the compression calculation an...   Feb 27 2024, 01:14 PM
cgnj   @vjb206 I lied somewhere. I said my chamber volum...   Feb 27 2024, 04:31 PM
r_towle   You need to swap the short cylinders with the long...   Feb 27 2024, 06:09 PM
densible1   You'll need to shim bottom of cylinder to achi...   Feb 27 2024, 06:23 PM
technicalninja   [b]@[url=http://www.914world.com/bbs2/index.php...   Feb 29 2024, 09:39 AM
Geezer914   Almost 1/4" of shims, isn't that a lot? ...   Feb 29 2024, 11:26 AM
Jack Standz   +1 Yes, agree with post #18 from the ninja above....   Feb 29 2024, 11:42 AM
technicalninja   I'm planning on re-using the original Mahle cy...   Feb 29 2024, 01:10 PM
vjb206   Did some measurements this weekend! http://ww...   Mar 5 2024, 09:01 PM
Superhawk996   Have you fully researched the use of head gaskets?...   Mar 5 2024, 11:03 PM
vjb206   Have you fully researched the use of head gaskets...   Mar 6 2024, 08:30 AM
930cabman   Have you fully researched the use of head gaskets...   Mar 6 2024, 10:09 AM
technicalninja   Did some measurements this weekend! [img]htt...   Mar 6 2024, 10:00 AM
technicalninja   I missed a critical point! Check deck height ...   Mar 6 2024, 10:38 AM
Montreal914   Detail in the grand scheme of things in the curren...   Mar 6 2024, 03:09 PM
r_towle   I think you need the longer cylinders from AA.   Mar 6 2024, 05:49 PM
Jack Standz   Did some measurements this weekend! [img]ht...   Mar 6 2024, 10:27 PM
vjb206   If I'm 90 under and get a 90 shim I'll be ...   Mar 7 2024, 03:16 PM
Superhawk996   Can / should multiple cyl base shims be stacked ...   Mar 7 2024, 06:58 PM
vjb206   Just going to do some more reading before pulling ...   Mar 7 2024, 09:16 PM
Jack Standz   I think you need the longer cylinders from AA. ...   Mar 6 2024, 10:35 PM
crash914   Also don't forget: Pushrods will not be stock....   Mar 7 2024, 12:22 PM
vjb206   Definitely planning on getting deep into the valve...   Mar 7 2024, 03:13 PM
930cabman   My vote goes to NO head gasket   Mar 7 2024, 03:24 PM
technicalninja   Proper quench distance is far more important than ...   Mar 7 2024, 10:44 PM
vjb206   Proper quench distance is far more important than...   Mar 18 2024, 06:40 PM
cgnj   @vjb206 I used a .140 shim. No head gasket. I la...   Mar 7 2024, 11:31 PM
vjb206   [b]@[url=http://www.914world.com/bbs2/index.php?s...   Mar 8 2024, 04:11 PM
Jack Standz   Proper quench distance is far more important than...   Mar 8 2024, 02:27 AM
VaccaRabite   I'd say that if you got 60cc measuring with yo...   Mar 8 2024, 12:25 PM
vjb206   I honestly never thought about the pushrod tube le...   Mar 8 2024, 04:11 PM
GBX0073   Rubber bands were mentioned found this picture to ...   Mar 10 2024, 12:14 AM
vjb206   Rubber bands were mentioned found this picture to...   Mar 18 2024, 06:35 PM
technicalninja   [quote name='cgnj' post='3132716' date='Mar 8 202...   Mar 10 2024, 12:26 PM
vjb206   [quote name='cgnj' post='3132716' date='Mar 8 20...   Mar 18 2024, 06:36 PM
vjb206   Just to close the loop here, I ordered a few shims...   Mar 19 2024, 08:18 AM
technicalninja   I'd run 9.5-10 on that cam. It's a good s...   Mar 19 2024, 08:46 AM
technicalninja   Watch for evidence of exhaust back pressure if you...   Mar 19 2024, 09:31 AM
burton73   Here is a picture of Marks 2270 RAT built 2005 Eng...   Mar 19 2024, 10:37 AM
cgnj   @vjb206 Based on your measurements, I think your ...   Mar 19 2024, 11:02 AM
burton73   Mark to show shim on the RAT rebuild 2270 Bob B   Mar 19 2024, 11:58 AM
technicalninja   OOOHHHH! Pretty pictures! Thanks Bob! ...   Mar 19 2024, 01:04 PM
Jack Standz   Yes, noticed that too. We run phenolic spacers w...   Mar 19 2024, 01:25 PM
cgnj   I cut my own gaskets. CSP linkage threaded rods to...   Mar 19 2024, 02:38 PM
burton73   The picture of intake port is from the moment of t...   Mar 19 2024, 03:15 PM
VaccaRabite   The Windage tray modification was a RAT deal in...   Mar 20 2024, 05:22 AM
technicalninja   When I'm "finished" with port matchi...   Mar 19 2024, 05:21 PM


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