lifters?

[ericjon262]

if anyone wants to throw a coupl ebucks towards research, we can find out on my 3500!

[NateD4]

How much interest is there in a higher performance lifter for these engines?

I'm working on my 3.9L build and am trying to get to 8500 RPM with roller hydraulics. I was going to buy a CTS-V lifter with the ceramic ball checks etc.. and see if I can design some guts for the stock lifters that'll work...

With that said, how much interest is there in a higher RPM lifter?

One of my machinists could make me whatever parts I need for an internal swap.

From what I've determined so far matching leak down rates is the harder part especially on used lifters. Anyone have a leak down rig already?

[ericjon262]

How much interest is there in a higher performance lifter for these engines?

I'm working on my 3.9L build and am trying to get to 8500 RPM with roller hydraulics. I was going to buy a CTS-V lifter with the ceramic ball checks etc.. and see if I can design some guts for the stock lifters that'll work...

With that said, how much interest is there in a higher RPM lifter?


One of my machinists could make me whatever parts I need for an internal swap.

From what I've determined so far matching leak down rates is the harder part especially on used lifters. Anyone have a leak down rig already?

CTS-V uses the same lifters as all other LSx motors, and they're known to go to about 7500 rpms. I know I'm probably about to get laughed at, but what about a "rev kit" kinda like the AFR Hydra-rev? if you have a spring apply pressure to just the lifter body, and not the plunger, you'll take some load off the valvesprings, which would allow to reduce seat pressure, and reduce the the distance the plunger in the lifter actuates.

here's a pic pf the hydra-rev before pushrod installation

http://www.firebirdnation.com/forums/uploads/1211845880/gallery_7_822_1172.jpg

http://www.jegs.com/i/AFR-Airflow-Research/033/6150/10002/-1?parentProductId=

[NateD4]

Really the issue isn't just with valve springs as much as the collapse rate of the lifters and the internal forces of the ball check valves closing.

The CTS-V lifters have ceramic ball checks in them and are also shimmed to only allow @0.030" hydralic movement (or so I'm told).

I have heard that they are rated to 8500 RPM though and are not the same part number as those used in the LS7.

A rev kit spring system would work fairly well to reduce the valve spring requirements, however from the numbers I've run so far it only buys you a few Hz of natural frequency.

Just my opinion.

[ericjon262]

Really the issue isn't just with valve springs as much as the collapse rate of the lifters and the internal forces of the ball check valves closing.

The CTS-V lifters have ceramic ball checks in them and are also shimmed to only allow @0.030" hydralic movement (or so I'm told).

I have heard that they are rated to 8500 RPM though and are not the same part number as those used in the LS7.

A rev kit spring system would work fairly well to reduce the valve spring requirements, however from the numbers I've run so far it only buys you a few Hz of natural frequency.

Just my opinion.

everything I've seen is that they are the same. got part numbers?

[ericjon262]

anyone have a set of lifters they would like to "donate" to R&D? I'm going to pick up a set of "LS7" Lifters and see if the newer ceramic check balls interchange.

[Superdave]

I found one of the LT1 lifters that I took the springs out of for mine. Hopefully the pictures stay working, my ISP is having issues lately..

Here is the height difference..




Here is a LT1 lifter in a 3500 block with a stock cam at max lift. You can see the oiling hole is up past the lifter bore. You'd have little to no oil pressure using these.. lol





Here is a stock lifter at max lift;

[ericjon262]

Thanks for posting that!

[ericjon262]

alright guys, I'm heading to the Junkyard tomorrow for a set of lifters. I'm going to try to make this happen with the LS7 guts in the 3X00 body.

[ericjon262]

got a set of stock lifters, and I've got a set of "LS7" lifters on order with USA Performance here in Pensacola.

The stock lifters were $10 with a free S-10 glovebox!, and the "LS7" lifters are about $150.

[ericjon262]

and FYI, 3800's use "V8" size lifters.

[ericjon262]

I took 3 lifters apart today,

1 3400 lifter

1 "LS7" lifter

and

1 Comp Magnum SBC Lifter.

The comp and the LS7 were nearly identical. I also found that if you machined the piston on the V8 lifters down a little bit, you could install them in the 60* and turn them into solid lifters.

Pics tomorrow

[ericjon262]

a little later than tomorrow, but here you go





Left to right, Comp cams "magnum" "LS7" and stock 60*

[Keoki1978]

How much interest is there in a higher performance lifter for these engines?

I'm working on my 3.9L build and am trying to get to 8500 RPM with roller hydraulics. I was going to buy a CTS-V lifter with the ceramic ball checks etc.. and see if I can design some guts for the stock lifters that'll work...

With that said, how much interest is there in a higher RPM lifter?

One of my machinists could make me whatever parts I need for an internal swap.

From what I've determined so far matching leak down rates is the harder part especially on used lifters. Anyone have a leak down rig already?

Hey NateD4, I posted a while ago under general discussion but since you got the 3900, you should see if the LSX lifters will fit your block. I know that the 3900 has DOD just like the LSX engines do, so what are the chances that GM would spend all that money to design 2 different DOD lifters for 2 different engines. I was thinking the same thing bout the vvt 3500 since it has a smaller stroke, those lifters and 8000 rpm's isn't far away.

[ericjon262]

I put the lifters I had in a cleaning solution, and for got to take them out, now they are gobs of rust... time for another set...