Piston Choice

[LTHLRB]

yeah my brothers 180sx which has a fully built sr20det, cp forgies, eagle steel rods H beam and acl race series bearings. Its a killer engine.

But then you get mechanics that will only use nissan bearings or a type of ring set etc

[STATUS]

BTW they make good cheap bearings for rb26, 25 and 30 as well

yeah they are alright for comp engines (i use the race series) but a 100% no-no for streeters to hard and unforgiving ive gone back to kings believe it or not. i was noticing quite a lot of wear on the crank journals after long service periods (high km's) on road cars. Alot of the old V8 guys are seeing the same thing in thier high hp engines.

but hey every one has an oppinion and at the end of the day if it works then brand is irrelevant... there are 1000's of ways to skin a cat

the last few customer SR20's i pulled down were built using combinations.. clevite mains and nissan bigends... obviously someone found that combo worked for them or thier budget.... oh best mod on one was that they put 2 of the second rings in upside down.... worked great ...NOT

[LTHLRB]

what you mean trent? as in streeters that rack up a few k's with those bearings?

[GeeTR]

Track cars see low km's and sooner service (pull down) Hi Po street cars see maybe 100,000 km's before a freshen up, decreasing the chance of noticing greater then normal journal wear... im assuming hes saying.

[Abo Bob]

all of our motors run acl forgies with no problems.

*cough* no problems.

[Guilt-Toy]

i use the acl race series bearings in my engine as well and its a streeter... got me worried now.... i use motul 300v chrono and i change it every 5000km's or before... i have the mahle acl forged pistons as well and china made H beam rods

[SATO GTS]

i am using acl race pistons, bearings, mls kit and eagle h beam rods, when it's built and bedded in will let you know ..

[Duncan]

lol that motor had standard pistons thanks mate.

And yes trent we pull apart the race motors every 5000-20000klm depending on how lucky we are and chuck in new bearings - our engine guy hadn't mentioned a concern with journal wear but I ight ask them specifically

[N I B]

We use CP pistons(Tomei on strokers) and ACL race bearings in almost everything inc WAs 2 fastest race Skyline and don't have any problems, Never seen this crank wear issue.

The only Piston I see with problems is Venolias with cracks starting at the oil jet cutout, but only on RBs.

[NYTSKY]

Where can you get ACL pistons from, at a good price these days?

Do they come with rings?

[Duncan]

don't know.

and yes

[STATUS]

We use CP pistons(Tomei on strokers) and ACL race bearings in almost everything inc WAs 2 fastest race Skyline and don't have any problems, Never seen this crank wear issue.

The only Piston I see with problems is Venolias with cracks starting at the oil jet cutout, but only on RBs.

how many of them have been torn down and micced up at 50000km? not many i bet.... like i said in all the comp engines i use acl race but for engines that need to last extended periods ive moved to something a little softer

[blu gtr]

how many of them have been torn down and micced up at 50000km? not many i bet.... like i said in all the comp engines i use acl race but for engines that need to last extended periods ive moved to something a little softer

Shouldn't the engine oil create a protective film between the bearing and the crank, and the wear of the crank journals be a function of the oil's film strength rather than the hardness of the bearing?

[BoostdR]

CP FTW

ACL, not keen at all. Have seen to many oil burners. The rings are also hard to get replacements for.

[NYTSKY]

Ill see your CPs and raise you a Mahle

[BoostdR]

haven't seen the same consistency with mahle over cp. ie size and weight.