Need some bottom end advice
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Honda-Tech Member
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From: South Florida
Need some bottom end advice
motor-2jz-gte
Turbo- 71-72mm
head ported, and have cams. I will be using eagle rods, Im concerned about motor longevity going from stock 6800 rpms to 8500 rpms.
(1)Theoretically speaking, lighter rods and pistons should put less load on the rod bearings so they should see less wear even at over 8k correct?
(2)what bearings would I use? I was thinking honda bearings. but having them sized to fit a 2jz crank is uncharted territory for me, and have no idea what I would even do as far as clearances.. tight, or loose?
Turbo- 71-72mm
head ported, and have cams. I will be using eagle rods, Im concerned about motor longevity going from stock 6800 rpms to 8500 rpms.
(1)Theoretically speaking, lighter rods and pistons should put less load on the rod bearings so they should see less wear even at over 8k correct?
(2)what bearings would I use? I was thinking honda bearings. but having them sized to fit a 2jz crank is uncharted territory for me, and have no idea what I would even do as far as clearances.. tight, or loose?
Thread Starter
Honda-Tech Member
Joined: Nov 2003
Posts: 3,711
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From: South Florida
Re: Need some bottom end advice
Honda bearings work on a variety of small block chevy v8 motors, and toyotas. something funny?
Most people advise against reving high on OEM 2j bearings I know a lot of guys who run 9k rpm Naturally aspirated SBC's and they use only OEM honda bearings because supposedly they are pretty reliable for that kind of abuse.
Most people advise against reving high on OEM 2j bearings I know a lot of guys who run 9k rpm Naturally aspirated SBC's and they use only OEM honda bearings because supposedly they are pretty reliable for that kind of abuse.
Last edited by Boostage; Oct 5, 2009 at 06:16 PM.
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Joined: Jul 2002
Posts: 3,842
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Re: Need some bottom end advice
I just can't imagine there isn't a supra forum that could answer this question better for you...
Generally
1. Yes if they're lighter there is less strain, people also knife edge cranks to lighten them and allow them to "cut" through the oil in the oil pan more efficiently, although from what I read around here I don't think it's very popular... domestic guys do it a lot.
Also generally people are more concerned with the valve train for reving high... you have to have high pressure springs to ensure there is no valve float at high rpm. Also lightening the valvetrain is a popular way to safely rev higher... whether it's the billet aluminum rockers for B's or lightening the stock rockers by removing material (carefully and sparingly) or by using titanium valve spring retainers instead of steel ones. Also the use of roller rocker rocker arms is a great way to reduce strain on the valvetrain and allow for higher revs.
2. As far as bearings if your rod and main journals are the same size as ANY honda crank you can order the bearings in a TON of different thicknesses.
The other important thing for reving high is VERY even tolerances. You could also have the crank micropolished to ensure lowest possible friction on the bearings.
Good Luck!
Generally
1. Yes if they're lighter there is less strain, people also knife edge cranks to lighten them and allow them to "cut" through the oil in the oil pan more efficiently, although from what I read around here I don't think it's very popular... domestic guys do it a lot.
Also generally people are more concerned with the valve train for reving high... you have to have high pressure springs to ensure there is no valve float at high rpm. Also lightening the valvetrain is a popular way to safely rev higher... whether it's the billet aluminum rockers for B's or lightening the stock rockers by removing material (carefully and sparingly) or by using titanium valve spring retainers instead of steel ones. Also the use of roller rocker rocker arms is a great way to reduce strain on the valvetrain and allow for higher revs.
2. As far as bearings if your rod and main journals are the same size as ANY honda crank you can order the bearings in a TON of different thicknesses.
The other important thing for reving high is VERY even tolerances. You could also have the crank micropolished to ensure lowest possible friction on the bearings.
Good Luck!
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b16vtecsol
All Motor / Naturally Aspirated
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Nov 20, 2003 11:35 AM
