Checked my main bearing clearances with ACL bearings...
#1
Honda-Tech Member
Thread Starter
Checked my main bearing clearances with ACL bearings...
First, the pics.
Clearances:
Journal #1: .0017" (crank pulley)
Journal #2: .0016"
Journal #3: .0019"
Journal #4: .0017"
Journal #5: .0015" (flywheel)
Service Spec: .0009" to .0017"
Service Limit: .0020"
So, they are all pretty loose, but they are within spec. I'm happy.
For reference, my factory bearing codes are:
Journal #1: C2 (Green)
Journal #2: C3 (Brown)
Journal #3: B2 (Yellow)
Journal #4: B3 (Green)
Journal #5: B2 (Yellow)
Those numbers were right in the middle of the bearing chart.
Sonny
Clearances:
Journal #1: .0017" (crank pulley)
Journal #2: .0016"
Journal #3: .0019"
Journal #4: .0017"
Journal #5: .0015" (flywheel)
Service Spec: .0009" to .0017"
Service Limit: .0020"
So, they are all pretty loose, but they are within spec. I'm happy.
For reference, my factory bearing codes are:
Journal #1: C2 (Green)
Journal #2: C3 (Brown)
Journal #3: B2 (Yellow)
Journal #4: B3 (Green)
Journal #5: B2 (Yellow)
Those numbers were right in the middle of the bearing chart.
Sonny
#3
Honda-Tech Member
Join Date: Feb 2001
Location: Tejas
Posts: 6,351
Likes: 0
Received 0 Likes
on
0 Posts
Re: Checked my main bearing clearances with ACL bearings... (Midwestrider)
damn, very nice....
mine should be within those areas then,. mine were
green
green
green
yellow
green
stan
mine should be within those areas then,. mine were
green
green
green
yellow
green
stan
#4
Honda-Tech Member
Thread Starter
Re: Checked my main bearing clearances with ACL bearings... (Midwestrider)
congrats sonny
how many hrs you having into rebuilding your motor?
how many hrs you having into rebuilding your motor?
Sonny
#5
Re: Checked my main bearing clearances with ACL bearings... (Sonny)
sonny, mine looked similar with acl bearings on my b18c1.
how can you give such numbers when plastigauge doesn't give you that much resolution? bottom line is, with the acl standard set of bearings and a stock crank and block, you will fall within the spec. You just wont get down to what Honda does where they make bearings to get out to .000x decimal place. my motor has only 430 miles on it and running very well as i'm breaking it in. Very soon I'll be boosting hard again!
how can you give such numbers when plastigauge doesn't give you that much resolution? bottom line is, with the acl standard set of bearings and a stock crank and block, you will fall within the spec. You just wont get down to what Honda does where they make bearings to get out to .000x decimal place. my motor has only 430 miles on it and running very well as i'm breaking it in. Very soon I'll be boosting hard again!
#6
Honda-Tech Member
Thread Starter
Re: Checked my main bearing clearances with ACL bearings... (GruvyTune)
sonny, mine looked similar with acl bearings on my b18c1.
how can you give such numbers when plastigauge doesn't give you that much resolution? bottom line is, with the acl standard set of bearings and a stock crank and block, you will fall within the spec. You just wont get down to what Honda does where they make bearings to get out to .000x decimal place. my motor has only 430 miles on it and running very well as i'm breaking it in. Very soon I'll be boosting hard again!
how can you give such numbers when plastigauge doesn't give you that much resolution? bottom line is, with the acl standard set of bearings and a stock crank and block, you will fall within the spec. You just wont get down to what Honda does where they make bearings to get out to .000x decimal place. my motor has only 430 miles on it and running very well as i'm breaking it in. Very soon I'll be boosting hard again!
I am able to give those numbers because I did not use the plastigage "ruler" to measure the thickness of each crushed strip. My caliper showed that the width of the .0015" ruler marking was 0.134". The width of the .0020" ruler marking was 0.167".
So, by using my caliper to measure the width of the crushed plastigauge, I was able to figure it out down to the .000x.
Sonny
[Modified by Sonny, 9:15 AM 8/6/2002]
#7
Honda-Tech Member
Re: Checked my main bearing clearances with ACL bearings... (Sonny)
congrats sonny
how many hrs you having into rebuilding your motor?
Man...I lost count a looong time ago. It's always a few hours here and a few hours there. Generally when I'm wrenching, it's night time when the wife is asleep.
Sonny
how many hrs you having into rebuilding your motor?
Man...I lost count a looong time ago. It's always a few hours here and a few hours there. Generally when I'm wrenching, it's night time when the wife is asleep.
Sonny
I am usually making my posts late at night as I get home usually from work at 12-1AM....That is usually when I see your new posts on this and the performance forum....funny.
Trending Topics
#10
Honda-Tech Member
Re: Checked my main bearing clearances with ACL bearings... (Sonny)
Wow Sonny. Thanks so much for posting this. I feel much better about going with the ACL's now. My only problem is that on the Journal #4 the factory calls for a pink. Now, on your Journal #3 you had the loosest clearance at .0019". Im just hoping that with my "pink" that I fall within spec. If not I guess I will have to order a factory bearing and mix it in.
I think I recall Earl commenting on how loose a motor should, or shouldn't be. Loose would obviously let more oil in, but stand for an opportunity to spin a bearing. Tight obviously wont get the needed oil and create heat---then I guess bind and still spin the bearing. I'm not sure if I remember exactly what he said---hopefully he will see this and post. What would be the best for FI?? Especially if I plan to take my LS into the 8K range with new valvetrain.....
Great thread
I think I recall Earl commenting on how loose a motor should, or shouldn't be. Loose would obviously let more oil in, but stand for an opportunity to spin a bearing. Tight obviously wont get the needed oil and create heat---then I guess bind and still spin the bearing. I'm not sure if I remember exactly what he said---hopefully he will see this and post. What would be the best for FI?? Especially if I plan to take my LS into the 8K range with new valvetrain.....
Great thread
#11
Honda-Tech Member
Thread Starter
Re: Checked my main bearing clearances with ACL bearings... (93LSivic)
I am not sure what Earl recommends (I am sure he will chime in), but on a high hp/race engine, Mike Kojima (Nissan engine building guru) recommends that the main bearings be loose and the piston-to-wall clearance be tight.
Sonny
Sonny
#18
Honda-Tech Member
Re: Checked my main bearing clearances with ACL bearings... (Sonny)
I am able to give those numbers because I did not use the plastigage "ruler" to measure the thickness of each crushed strip. My caliper showed that the width of the .0015" ruler marking was 0.134". The width of the .0020" ruler marking was 0.167".
So, by using my caliper to measure the width of the crushed plastigauge, I was able to figure it out down to the .000x.
Remember, your goal is to have the largest clearance at #3 (middle)
#19
Re: Checked my main bearing clearances with ACL bearings... (earl)
Remember, your goal is to have the largest clearance at #3 (middle)
__________________________________________________ __________________
why is that? thanks.
__________________________________________________ __________________
why is that? thanks.
#21
Honda-Tech Member
Re: Checked my main bearing clearances with ACL bearings... (therumblingteg)
Remember, your goal is to have the largest clearance at #3 (middle)
__________________________________________________ __________________
why is that? thanks.
__________________________________________________ __________________
why is that? thanks.
#22
Re: Checked my main bearing clearances with ACL bearings... (earl)
Remember, your goal is to have the largest clearance at #3 (middle)
__________________________________________________ __________________
why is that? thanks.Two reasons I can think of but I'm not sure of either is the exact reason. The middle bearing oils differently than the other bearings and needs more room or the centerline of the crank would have the most runout in the middle. Anyone else have a different idea.
__________________________________________________ __________________
why is that? thanks.Two reasons I can think of but I'm not sure of either is the exact reason. The middle bearing oils differently than the other bearings and needs more room or the centerline of the crank would have the most runout in the middle. Anyone else have a different idea.
#23
Honda-Tech Member
Re: Checked my main bearing clearances with ACL bearings... (Arturbo)
That is interesting. If you notice, there is not an oil hole in the middle main journal of the crank.
#25
Join Date: Jul 2002
Location: Chicago burbz, il, USA
Posts: 271
Likes: 0
Received 0 Likes
on
0 Posts
Re: Checked my main bearing clearances with ACL bearings... (earl)
Anyone else have a different idea.