OEM vs ACL bearings


Oh decent link! Worth a punt at that price!
Haven't looked fully but do they do colour coded individual bearings? Or just "standard size" etc
 
There's no standard size as such it all goes by the colour chart, if you need all green then you could risk the acl but personally I'd go OEM, I did on my high comp engine, I spent a fortune on my build but wanted to do it right, I went to honda and got all OEM seals throw out think it was close to 1k at the time for just some of the bugs needed lol have you tried pm'ing simauto on here for prices?
 
This is what we are saying, all the aftermarket bearings say "standard size" when there is no standard for these.
Stripped two engines and both had completely different colour bearings in.
 
Ive been looking for somewhere else to get them,
not had a lot of luck, but did find their website which has a link to email the company,
http://www.taihonet.co.jp/e/after_m01.html

Could also try getting hold of japservice parts see if they have any on the way soon
 
kellsled said:
There's no standard size as such it all goes by the colour chart, if you need all green then you could risk the acl but personally I'd go OEM, I did on my high comp engine, I spent a fortune on my build but wanted to do it right, I went to honda and got all OEM seals throw out think it was close to 1k at the time for just some of the bugs needed lol have you tried pm'ing simauto on here for prices?
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If I need all green, and ACL are that, why would you recommend OEM over ACL?
I dont know what size to get prices for as I dont have any colours to go off of, all I've been given is that my crank is 'standard size' I guess to be precise I'd need him to measure the bore the bearings sit in and crank journal then calculate what I need for each one hmm
 
That's it, total pain in the arse but needs must.
Think we are talking about afew 0001" between each colour bearing though?
 
emailed JSP for a lead time if they can get these back in stock. Might be worth chucking Taiho an email, cheers!
I found a K20 link from them with brown and slightly oversized so maybe it is possible to get other sizes.

I'm not trying to skimp on the build, but I cant find any great argument for OEM if I need the size that ACL are :/
 
jesse888 said:
This is what we are saying, all the aftermarket bearings say "standard size" when there is no standard for these.
Stripped two engines and both had completely different colour bearings in.
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green is the middle size out of all the coloured bearings iirc, so people just refer to it as being the standard size.
I think the green size is what was aimed for in the factory when machining the blocks and cranks and the alternative coloured bearings +/- in size were introduced to allow a slightly larger margin of error on machining,
The different size bearings essentially make up for the margin of error
 
Yeah just checked, the range from smallest to largest is .001"
Most peoples equipment can only measure that far, takes a decent micrometer to measure down to .0001"
Not sure what the clearance is supposed to be?
 
I'm finding the clearance for mains is 0.0015-0.0017 on a b18c?
So you can "jump" two complete colours on oem and still be within oem clearance?
Say from green to black? This leads me to believe you have to be pretty unlucky for the ACLs to actually fall far out of clearnance considering they are marked as "standard size" so technically green?
 
Got 10 old spare oem if any one needs to use them black , red , yellow . A few mark on them . Just for measuring
 
jesse888 said:
I'm finding the clearance for mains is 0.0015-0.0017 on a b18c?
So you can "jump" two complete colours on oem and still be within oem clearance?
Say from green to black? This leads me to believe you have to be pretty unlucky for the ACLs to actually fall far out of clearnance considering they are marked as "standard size" so technically green?
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That's pretty much what I thought back when I researched it, I had screen shots of the manual on my old phone but can't find them now.

If your going to be running at higher temps I would think it would be better to run at the larger end of the scale on the suggested clearance to allow more room for expansion.
 
OEM Honda bearings are widely known as the best bearings that you can buy for your motor if you get the sizes exactly right when measuring

With the revs that Honda engines need I think that bearings and engine internals are extremely important, it's a completely different engine when building due to the tolerances and can't be compared to your average performance road car engine

A friend had a set of ACL standard size bearings in his green marked engine and they failed after a few trackdays. Im not saying that the bearings were the cause of failure and his engine may have had oil pressure issues. The only good thing was that the crank still looked new and the ACL rod bearings were scored so they must be reasonably soft, I would rather have to replace bearings than a crank as its very hard to get a company that you can trust to re-grind the crank so that its 100%
 
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I can't see the difference between them if you can get the clearance the same? May take a punt on some ACL and see what the clearances come out like.
The oem option is real expensive when you add it up as said before. £400+ for some bearings is pretty steep lol
 
nicole_ said:
If I need all green, and ACL are that, why would you recommend OEM over ACL?
I dont know what size to get prices for as I dont have any colours to go off of, all I've been given is that my crank is 'standard size' I guess to be precise I'd need him to measure the bore the bearings sit in and crank journal then calculate what I need for each one hmm
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Because with the honda bearings you no there is no chance of them failing if sized correctly, I've herd of engines with acl bearings failing as said some of the bearings are regarded as "standard" size. I no when I was building mine I would go OEM everytime.most people I've seen building engines over here seem to go for OEM, don't no an awful lot about the acl ones but I remember a member on here recommended I went for OEM so I decided to do that to save any issues if any. If your builder has said you need all green bearings then go for the acl there a good company and Alot of engines use there bits I'm just saying from personal experience when I built my high comp I went OEM and had no issues and don't want you to either :)
 
jesse888 said:
I can't see the difference between them if you can get the clearance the same? May take a punt on some ACL and see what the clearances come out like.
The oem option is real expensive when you add it up as said before. £400+ for some bearings is pretty steep lol
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I'm no expert but from talking to Honda engine builders "apparently" the ACL bearings do not have as tight a tolerance as the OEM Honda bearings. It could be a case of they are 100% for fast road use but when under hard track use it may be a different story.

I have also noticed that any big Honda tuning companies seem to use OEM or cosworth bearings, again I couldn't say if Cosworth are better than ACL but you could ask why they choose to use those particular bearings
 
in most cases of a failure it's almost never down to bearing material.

It will usually be a bent crank or a warped block or a out of round con rod something misaligned or miss measured or a lubrication problem

There is probably just as many cases of oem failures as ACL, and 99% of the time there will be a logical explanation

There should be no problem with the ACL as long as you check the clearances rather than hope for the best.

Personally as I said before I would try and get the set of taiho standards and work from there
 
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Still doesn't seem people KNOW why oem is better than acl. Totally agree with b16 mini that there's just as many oem ones gone as acl, and that there's a thousand different reasons. Look at my build, crank I got spun bearings and was so bent it's unusable and that had oem ones.
I don't see how the actual bearing can fail. If the clearances are checked with acl and are perfect then it would be just like having oem?

I got a lead time from JSP for taiho, they're coming back in stock end of the month but he can't get them any sooner :( dammit!
 
ACL" duraglides" are the ones to go for over their "race" versions, my engine builder recommended those as he said the race versions can be bit hard on the crank.

I have used duraglides on two engine builds with no problems to date.

I can supply oem bearings if needed and poss the duraglides also.
 
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