4g63T lifter upgrade 6 bolt 1g

[AdamLaserRS]

Hey has anyone done a lifter up grade? Are 6g72 lifters an upgrade? I’ve been looking for a while now just out of curiosity, and idk if I haven’t been wording it right but I can’t find any info, and my friends with 6g72TT engines aren’t that interested in finding out.

 

[Dericsh]

Post 2 in This thread will show you the difference in the 1g and 3g aka “big bore” lifters.

 

[DSMPT]

Are 6g72 lifters an upgrade?

The same as 4g63. Nothing is special. The big bore lash adjuster is a revised version. Many people run the big bore ones now, but if you rev higher than usual and struggling with dropping rocker arms, the small bore ones may be better for you.

 

[dustyboner]

just don't mix up
3g lifters-- as in the 3rd generation of the lifter

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and

3g lifters -- as in lifters for a 3rd gen eclipse (4g64/6g74)

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[NOSLO2PT0]

The same as 4g63. Nothing is special. The big bore lash adjuster is a revised version. Many people run the big bore ones now, but if you rev higher than usual and struggling with dropping rocker arms, the small bore ones may be better for you.

Why would the small bore lifters be beneficial in this scenario?

 

[steve]

Why would the small bore lifters be beneficial in this scenario?

When I gave Yusef my old ones, he said that the small hole HLA's reduce the oil flow in the head and help keep the pressure up. But I may have misunderstood.

 

[AdamLaserRS]

Thank you guys very much for the info, I greatly appreciate it.

 

[Kryndon]

When I gave Yusef my old ones, he said that the small hole HLA's reduce the oil flow in the head and help keep the pressure up. But I may have misunderstood.

Indeed. In scenarios where you have increased oil pressure throughout the system (such as deleting balance shafts and not porting the oem relief valve etc.), it helps to keep volume in the head DOWN but pressure UP, by using the 1G small hole lifters. This way you don't starve the bottom end of oil volume as much especially during high revs like Hiroshi mentioned. Also just an FYI it's possible to mix the revised lower portion of the lifter (with bigger side orifice) and retaining the 1G top part with the smaller hole. Slightly reduces the chances of blockages if you suspect your oil galleys are contaminated/crusty.

 

[DSMPT]

Why would the small bore lifters be beneficial in this scenario?

As far as I know, 1g HLA at high rpm by aggressive cams/springs, is mechanically (plunger) more stable/has a better high-speed follow-up ability than 3 g's. And also like @steve said above, it would drop less oil into head.
I think, some high RPM (10,000+ RPM) people preferably use 1g HLA, besides solid. I had never had any issues with 3g HLA under 9,500rpm when I had though.