5.7L Goodies

[Centurion]

Anyone had a chance to play with the new variable timing cam and variable intake and new heads from '09? Believe someone said that the variable intake is only going on the truck version of the 5.7... Any speculation if it these will fit on pre-'09s?

[gremlinsteve]

some of the parts are trickling out. not alot...but some...


steve

[moonstreaker]

From what I've read the '09 up heads will fit, but you'll need the '09 up intake and srt8 headers. The '09 heads will significantly raise comp ratio though, so no boost (especially on a stock bottom end).

[PowerWagon896]

It's the VCT that interests me. I already have a great set of heads.

I did some research & found a Borg Warner (I think) set up that looks to be contained in the cam sprocket.

It looks like it might be a "mechanical" system perhaps RPM related.

If that's the case, it might be able to be retrofitted into an earlier year 5.7.

Low end TQ & top end HP too.

[Dantra]

Probably more bang for the buck to just get a good aftermarket cam and mod your heads a little.

[Fargo59]

It's the VCT that interests me. I already have a great set of heads.

I did some research & found a Borg Warner (I think) set up that looks to be contained in the cam sprocket.

It looks like it might be a "mechanical" system perhaps RPM related.

If that's the case, it might be able to be retrofitted into an earlier year 5.7.

Low end TQ & top end HP too.

how about a master tech on the subject? this months:

all next generation 5.7L engines receive Variable camshaft timing, or VCT. if you are familiar with the system on the Viper 8.4L engine, the one on the 5.7L engine will look familiar. The PCM controls VCT based on a number of inputs. Included in these is an oil temperature sensor to help the PCM determine when to actuate the solenoid on the oil control valve. That is attached to the block behind the timing cover. The PCM operated the valve by means of pulse width modulated signals which can range from zero to 100%. when the pcm is changing cam phasing, pressurized oil flows from a passage in the block into the oil control valve. from there it is directed into one of the two passages in the camshaft number one bearing journal. the oil then flows to one side of the vanes in the camshaft phaser. oil on the other side of the vanes is exhausted via the other camshaft passage. at zero percent duty cycle, the valve directs oil to the advance dise of the vanes, which results in a fully advanced cam phaser. at 100% duty cycle, oil is directed to the retard side. this results in a timing of about 36 degrees BTDC. at 50% oil is directed to both sides, and maintains the current cam phaser position.

this does not look to be retrofitable. also, there are 5 different cams for VCT hemi's, and a new oil pump is out for it. even states it will not work on previous hemis.

[Centurion]

Sounds like I'm gonna be dropping a new motor in once this car is done being a daily driver...

[Fargo59]

either way, wow, 36 degrees of adjustment is a lot. i think the 09 PCM should work in 07+ but i have no way to prove it other than to switch it all out, along with the vct engine.