Just trying to work out the rod and main bearing info I need so I can give this to Z1 when ordering Engine Bearings Set.

 

Can someone just confirm I have worked this out correctly please.

 

Crankshaft pin grade for connecting rod bearings: 110001

 

Grade number for each connecting rod big end: 000000

 

Grade number for each cylinder block main journals: 2222

 

Grade number for each crankshaft main journals: F1111

 

So below will be the grades I need to order?

 

Main bearing grade will be: 3333

Connecting rod bearing grade: 110001

 

I'm guessing that Z1 need both these grades even when ordering new eagle conrods and wiseco pistons?

 

Thanks again,

 

Ant

No they are not needed for ordering pistons or rods.

 

They are only needed if your buying Nissan OEM bearings, but you can not rely on the grade numbers because the engine may no longer meet tolerances or the crank may have been ground in the past.

 

Instead have an engineering shop measure and order them for you. Its best for them polish/grind the crank , measure and do the ordering than to just buy a set of graded shells.

 

Alternatively If you have the measurement tools yourself then check everything is within tolerance and order a set of ACL race bearings, which come in standard and oversize.

 

The nissan grading system is not necessary, the grade ranges are smaller than recommended tolerances anyway.

Edited April 16, 200916 yr by Yowser

What you've said makes sense Legrath regarding the engine no longer meeting tolerances and that the crank may have been ground in the past.

 

So I could order the wiseco pistons, conrods etc right away and then buy the bearings after the engineering shop has polished and ground the crank etc. Then get them to measure and from that I can then order the ACL race bearings?

 

Where can I get the ACL bearings from? Does Dan at DTA do them?

 

Once the the parts turn up I could get them to balance everything aswell.

 

Sorry for all the stupid questions.

 

Thanks again,

 

Ant

I have ordered the wiseco pistons, conrods etc and I then buy the bearings after the engineering shop has polished and ground the crank etc. Then get them to measure and from that I can then order the ACL race bearings?

 

Where can I get the ACL bearings from? Does Dan at DTA do them?

 

Once the the parts turn up I could get them to balance everything aswell.

 

Sorry for all the stupid questions.

 

Thanks again,

 

Ant

 

 

Bump

No they are not needed for ordering pistons or rods.

 

They are only needed if your buying Nissan OEM bearings, but you can not rely on the grade numbers because the engine may no longer meet tolerances or the crank may have been ground in the past.

 

Instead have an engineering shop measure and order them for you. Its best for them polish/grind the crank , measure and do the ordering than to just buy a set of graded shells.

 

Alternatively If you have the measurement tools yourself then check everything is within tolerance and order a set of ACL race bearings, which come in standard and oversize.

 

The nissan grading system is not necessary, the grade ranges are smaller than recommended tolerances anyway.

 

Hi Legrath;

Thanks for the info about bearings you have shared.

Have you any experience or knowledge with ACL rod bearings?

How are these compared to OEM bearings?

Can I take out 900 flywheel horses with ACL bearings?

My engine with brand new OEM bearings just broke down on 800 BHP.

Engine out once again, so this time I need the very best bearings.

Have you any good advice?:hyper:

Hi Legrath;

Thanks for the info about bearings you have shared.

Have you any experience or knowledge with ACL rod bearings?

How are these compared to OEM bearings?

Can I take out 900 flywheel horses with ACL bearings?

My engine with brand new OEM bearings just broke down on 800 BHP.

Engine out once again, so this time I need the very best bearings.

Have you any good advice?:hyper:

In my experience of building engines id say the power your engine produced had no effect on the premature failure of the bearings.Its more lightly to be caused by another factor.Maybe the crank journals or bearings were not sized right.Was the engine spotless when assembled and all galleries blown through with compressed air.is your oil pump up to scratch? Im not a great believer in "RACE" Bearings as all this usually means is the babbit or final white coating is not present.The bearings should have coped so id look elsewhere first.

Uk performance engine parts supplier ;) http://www.performanceenginecomponents.com/Default.asp

In my experience of building engines id say the power your engine produced had no effect on the premature failure of the bearings.Its more lightly to be caused by another factor.Maybe the crank journals or bearings were not sized right.Was the engine spotless when assembled and all galleries blown through with compressed air.is your oil pump up to scratch? Im not a great believer in "RACE" Bearings as all this usually means is the babbit or final white coating is not present.The bearings should have coped so id look elsewhere first.

 

I believe you are on to something very correct.

The fuel was tuned up to 1,8 BAR. There are indications on the pistons that the fuel was not fat enough above 1,8 BAR. The damaged bearings took place at 2,1 BAR. Z1 has indicated that proper and good tuning is the only way to avoid engine failure. So there are several indications that you are right. thanks.

Another bit of advise is dont waste money on a high flow oil pump.Only engines running low tolerances need these for full on race applications.On your engine the pump will rob horsepower supplying oil thats not needed which just gets returned back to the sump.

Another bit of advise is dont waste money on a high flow oil pump.Only engines running low tolerances need these for full on race applications.On your engine the pump will rob horsepower supplying oil thats not needed which just gets returned back to the sump.

 

Exactly the same advice has also been expressed from other experts.

The original pump has more than enough capacity for high performance engines.

Thanks a lot. :bow: