DoyoFCT
15+ Year Contributor
- 224
- 1
- Mar 31, 2005
-
Dayton,
Ohio
Well the common trend has been to go towards the revised lifters, which I have used with great success in many stock motors. I present a question as to how reliable/durable the revised lifters are at higher rpm's so im looking to get any feedback from people who have solid experience... no hearsay or opinions, just real data! I am currently building a 2.1 and have planned for ~9k but i may be pushing it a little higher depending on where the power range ends.
Now the hearsay/rumors/opinions/facts that I have heard are;
-revised lifters will cause pump up effects, and are known for collapsing/failing at upper rpms and are only safe to ~8500
-2g lifters use a smaller plunger, and have been successfully tested at very very high rpms
-1g lifters have a larger plunger than 2g's and are known for collapsing quite frequently
Here are some direct quotes on this topic from Fp's website, and kevin at kiggly racing.
from FP
I'm very curious if anyone has used this "jdm oil regulator" and I'm assuming this is the piece that comes on jdm cylinder heads that is secured by three bolts i believe. up top inbetween the cams.
kiggly
Again I believe the information from both of these sources to be very helpful in my plans, and I appreciate kevin taking the time to elaborate on his experiences. I'm fairly certain that I will be using New 2g lifters, but at 34 or so a pop. it doesn't sound like a fun investment. Solid lifters are not an option for me fyi. I would appreciate anyone who can describe their experience with ___ lifters, and especially anyone who has experienced a failure and can explain the specifics of that failure.
Now the hearsay/rumors/opinions/facts that I have heard are;
-revised lifters will cause pump up effects, and are known for collapsing/failing at upper rpms and are only safe to ~8500
-2g lifters use a smaller plunger, and have been successfully tested at very very high rpms
-1g lifters have a larger plunger than 2g's and are known for collapsing quite frequently
Here are some direct quotes on this topic from Fp's website, and kevin at kiggly racing.
from FP
For very high RPM applications we recommend using the early DSM style HLA's (they have a smaller diameter plunger) and reducing oil pressure to the HLA oil galley by using the early JDM oil regulator or a restricted orifice in the oil distribution block. These two items reduce HLA pump up effects.
I'm very curious if anyone has used this "jdm oil regulator" and I'm assuming this is the piece that comes on jdm cylinder heads that is secured by three bolts i believe. up top inbetween the cams.
kiggly
First off, thanks for the order. I'm only running my car to 9k right now (it is a 2.3l), on 2g lifters. I have several customers running my springs with 2g lifters to 10.5-11k with no problems. The 2g lifters have a smaller hydraulic plunger diameter than the 1g's. This makes the lifters less likely to stick collapsed because the higher operating pressure chamber (due to the smaller plunger) tends to self-clean better. I don't draw any distinctions between the 1g and 2g lifters for performance though. If the valvetrain setup is stable, the lifter really does absolutely nothing. Check out the video link on my website (link underneath the picture on the valvespring page). This was actually the most unstable rpm during the test. I should have an explanation on the website for why this is the posted video. It is up there because the spring is excited by the cam opening event, but it calms down (self-damps) before the next cam opening event. This is what we call a 'surge' point for the spring. Anyway, this video was with a 2g lifter on a Crane grind and 9.25k was the most 'active' point up to 12.8k where I stopped the test. I don't recommend running past 10.5k though because I've seen quick rocker tip wear by 11k.
Again I believe the information from both of these sources to be very helpful in my plans, and I appreciate kevin taking the time to elaborate on his experiences. I'm fairly certain that I will be using New 2g lifters, but at 34 or so a pop. it doesn't sound like a fun investment. Solid lifters are not an option for me fyi. I would appreciate anyone who can describe their experience with ___ lifters, and especially anyone who has experienced a failure and can explain the specifics of that failure.