Solid Lifters?

[ALZR1]

Originally Posted by LGAFF

But really fast....

I was just talking with a company...Adjustment is usually every 40K miles. However....to cover their ***....they advise every 15K.

Obvisouly with cams, radio delete, AC delete, and not flappy muffler I am not worried about a quiet ride.

Where do you get lifters from,and shim that go with them?


Al.

[LGAFF]

Several vendors on line with the same size lifters 034 motorsports I believe carries them

[rkreigh]

typical full boogie porting starts to nose over the power curve up above 7300 rpms so why do you want to put solids in it??

unless you have the cams and cyl head flow to really top out that high you don't need to worry about solids and the hassle with the upkeep

chains should be stronger too if you want to rev it that high

[Hog]

I am of the opion that you dont necessarily need to rev higher to take advantage of solid lifters.

A solid lifter will provide more consistent duration and lift numbers, but they have the setup issues.

Find a roller mechanical lifter for an LT5, and then you would have something.

[rkreigh]

I think you are right as the car would definitely not have any variance caused the the hyd lifters

but is the "juice worth the squeeze" ??? not to me.

so would the solids be "shimmed" to adjust them? not really that clear on how the solid cam would be setup on an lt5

as for a roller tappet. not really possible without a major redesign of the head

ford and others are now using a "roller finger" rocker that rides on the cam and then lifts the valve that would be a cool setup but it would require a completely new head

not sure how you could even do a "roller tappet"

for sure we need nelson racing or another enterprising vendor to digitize and whip out some MY 95 billet heads.

we are kinda "stuck" with the stock head and it's the choke point IMHO.

a much better flowing head would make a huge difference.

about 700 or so hp is "all in" on the NA LT5

[tpepmeie]

Originally Posted by rkreigh

about 700 or so hp is "all in" on the NA LT5

Ron, I think you can get upwards of 800 out of these heads, don't sell them short. But how much cam do you want to run?

To get there, you need to raise the peak power speed. The intake length is too long. 7500 rpm would be 5000 fpm piston speed with my stroke, which is a good 600 rpm higher than where I am peaking currently. Need to take more than an inch out of the intake tract length to make power there efficiently, and add about 20 degrees to the intake duration. I am at 255 @ .050 today, and that is about the limit for street.

The sheetmetal intakes I have seen all have compromises. Runners too short, and cross-section areas too big really hurt the torque output. There just isn't a good solution if you want it all to fit under the C4 hood.

These heads can move good air, but you have to have the other components right to use it.

Even at 7500, I wouldn't go to mechanical buckets. Unless I had money to burn and lots of time to get it right.

Todd

[Pete]

The new Porsche GT3 makes 475HP N/A from a 3.8L
Redline 9000 peak HP 8250 with hydraulic lifters.

Could be done but what are we trying to accomplish with solids?
Let me add if a pushrod motor benefits from solids might be they have too many moving parts/slop doesn't mean the LT5 will get same results since we have direct acting cam/lifter design.

Now if someone wants to spend the time and money I would love to know the outcome.

Pete

[Hog]

Pete, I think you are saying overhead valve engines have more valvetrain mass to overcome than overhead cam engines, thus may not react as favourably to solid lifters as OHV engines such as the GEn 1-GEN5 SBC.

I think you may be on to something there.

A solid OHC engine using solid direct acting lifters would be "lashed" via shims.

[XfireZ51]

Does anyone even have a hypothetical as to what hydraulic lifters is costing in terms of power? What would you need to gain (hp/tq) to make it worth your while to investigate? 5? 10? 25? 100? Any idea?

[Hog]

Originally Posted by rkreigh

I think you are right as the car would definitely not have any variance caused the the hyd lifters

but is the "juice worth the squeeze" ??? not to me.

so would the solids be "shimmed" to adjust them? not really that clear on how the solid cam would be setup on an lt5

as for a roller tappet. not really possible without a major redesign of the head

ford and others are now using a "roller finger" rocker that rides on the cam and then lifts the valve that would be a cool setup but it would require a completely new head

not sure how you could even do a "roller tappet"

for sure we need nelson racing or another enterprising vendor to digitize and whip out some MY 95 billet heads.

we are kinda "stuck" with the stock head and it's the choke point IMHO.

a much better flowing head would make a huge difference.

about 700 or so hp is "all in" on the NA LT5

roller, but not direct acting

but still has a hydraulic adjustment