L76/ New Callies Compstar crank tolerances.
04-26-2011, 03:59 PM
#1
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L76/ New Callies Compstar crank tolerances. Just measured these out real quick and they sound ok to me but wanted to check what you guys think for a Supercharged/street driven/and the occassional full speed highway run. 7000 RPM max, 10-14 PSI, and 10-30 full synthetic oil.
My mains measured out:
1. 0.0020"
2. 0.0018"
3. 0.0018"
4. 0.0020"
5. 0.0020"
And rods are:
1. 0.0019"
2. 0.0018"
3. 0.0022"
4. 0.0020"
5. 0.0018"
6. 0.0022"
7. 0.0020"
8. 0.0023"
Lemme know, thanks guys.
My mains measured out:
1. 0.0020"
2. 0.0018"
3. 0.0018"
4. 0.0020"
5. 0.0020"
And rods are:
1. 0.0019"
2. 0.0018"
3. 0.0022"
4. 0.0020"
5. 0.0018"
6. 0.0022"
7. 0.0020"
8. 0.0023"
Lemme know, thanks guys.
04-26-2011, 04:14 PM
#2
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Some will tell you that your mains are a little "loose" for an alum block but trying to tighten can be a pain. I had similar clearances and tried +1 bearings and got near zero clearances. If you need tighter bearings let me know...
04-26-2011, 04:57 PM
#3
If those are main and rod bearing clearances, which I assume they are, you might consider re-titling the thread to reflect that 
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04-26-2011, 07:18 PM
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04-26-2011, 07:42 PM
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04-26-2011, 07:47 PM
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I will re-check tomorrow. It's dimly lit where I was working last night and couldn't see all too well. And this was like 11 at night I was pretty tired. I don't think .0005 difference should hurt anything really?
04-26-2011, 07:57 PM
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04-26-2011, 08:15 PM
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tired and poor lighting is a very bad combination when working on engines.
04-27-2011, 12:12 AM
#12
FormerVendor
Just measured these out real quick and they sound ok to me but wanted to check what you guys think for a Supercharged/street driven/and the occassional full speed highway run. 7000 RPM max, 10-14 PSI, and 10-30 full synthetic oil.
My mains measured out:
1. 0.0020"
2. 0.0018"
3. 0.0018"
4. 0.0020"
5. 0.0020"
And rods are:
1. 0.0019"
2. 0.0018"
3. 0.0022"
4. 0.0020"
5. 0.0018"
6. 0.0022"
7. 0.0020"
8. 0.0023"
Lemme know, thanks guys.
My mains measured out:
1. 0.0020"
2. 0.0018"
3. 0.0018"
4. 0.0020"
5. 0.0020"
And rods are:
1. 0.0019"
2. 0.0018"
3. 0.0022"
4. 0.0020"
5. 0.0018"
6. 0.0022"
7. 0.0020"
8. 0.0023"
Lemme know, thanks guys.
Maybe there is a spec of something behind the bearing shells against the rod housing bore or between the rods which is throwing your measurements off a little bit. Make sure everything is clean everywhere and check them again.
04-27-2011, 10:04 AM
#13
Would also like to know what you are using to measure them, as most DIY'ers do not have accuracy to 0.000x"
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Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
04-28-2011, 12:28 AM
#15
FormerVendor
Yep we mic cranks all day long and set bearing clearance on every main and rod journal and Callies is very nice and very consistent!
05-03-2011, 01:28 PM
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Yup sorry the false alarm guys I was just using some crap plastigauge, so I went and got a JWK indicator. All the rods were .0021 except for number that I swear was .0019 every time I checked it. But the rod bearings I'm using are ACL coated so there may be a slight variance where I measured. I turned the crank a quarter revolution and it measured out .0020 so I'm happy about that.
