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Old 09-12-2010, 07:48 PM   #1
craftyvtec
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Default Rod bearing clearance with calico CT-1 Dry Film Coating STi

I am building my motor and I wanted some opinions on my bearing clearance. Motor should be around 400whp and will see road course time. I have calico CT-1 coated ACL rod bearings on stock rods with stock crank polished and checked. Here are my clearances. The first number is current clearance with coating. The second group of numbers is what the final clearance will be after coating wears off.
.0008 .0013-.0014
.0009 .0014-.0015
.0009 .0014-.0015
.0010 .0015-.0016


So let me know if I should proceed with assembly or make changes. Interested in what you guys think. I seems a little tight however I am not sure with the coating if that's ok.
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Old 09-12-2010, 08:02 PM   #2
john 1badSTI
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on e85@ 30psi--spinning

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you might check with calico on what they expect to wear off,I have used calico's brgs and the motors I took apart after they ran for a year showed very little of the coating worn off.I think as long as you use a good assembly lube that is thick and sticky it should reduce how much initial wear that happens during priming and initial start up. good luck
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Old 09-13-2010, 11:16 PM   #3
alcoolaid
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I run the same bearings and the wear is minimal. Here are some pictures of my main bearings after 10,000 miles. About 2,000 track miles.



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Old 09-13-2010, 11:23 PM   #4
craftyvtec
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Thanks for the pics, how about the rod bearing clearance, I think it might be too tight for track use.
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Old 09-14-2010, 12:07 AM   #5
Homemade WRX
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the coating is meant to be there in the case that your crank meets the bearing, thus keep standard clearances. In this case you'll only wear the coating IF you drop pressure, detonation, etc.

Run normal clearances for the given aspiration of the engine. Been using Calico coated ACL's in builds for 4 years...the only bearings I use/sell
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Old 09-14-2010, 03:51 AM   #6
alcoolaid
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I used the calico coated acl HX bearings to get my 0.0019-0.0020 rod bearing clearances. I don't think you can get 0.0015-0.0020 on the standard H size unless you open up the big rod ends but then you'll lose some bearing crush.
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Old 09-14-2010, 09:04 PM   #7
craftyvtec
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Yea I don't want to open up the big ends. I am looking for a set of the HX's now and I will just sell the standard H bearings.
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