Cams

[Minaj]

Just wondering does engine need to be removed to install cams?

[Guest]

Yes engine needs to come out not a job you do in your backyard either.

Just build a new engine like you were going to and set heads up for it. Drop it in in one hit and have a finished product.

[lachlan]

why take the engine out to do cams ?

we lost a lifter shim out of my mates v3 and managed to pull the cam and lifter out with engine in place . then measure , and install new shim / cam and the cover

obvoiusly you needa get all the crap off the guards . and have access to all the cam belt and jazz

oh god . shoulda looked at the name on it :

[Guest]

Its going to be big cams so need everything checking out and reshimming etc wouldnt it?

Pulling the engines quick easy job and would make the whole job so much quicker and smoother.

[funkytown]

why cams?

[Guest]

 funkytown said:

why cams?

Why ask why lol. Cant get 300kph before the end of orewa tunnels.

[Minaj]

 funkytown said:

why cams?

To Rev out faster

[funkytown]

with out more information that statement makes NIL sense.

if you\'re drawing a direct relationship between cam (size and change) to an increase in change of rpm then we have problems.

[boon]

 Minaj']

[quote name='funkytown said:

why cams?

/quote]

To Rev out faster

Uhh, what?

[Minaj]

I\'m planning to get crower camshafts 272\'s to rev up faster, does that make enough sense?

[funkytown]

no it still doesnt make sense. revs and cams are not directly related.. at all.

cam shafts are going to affect power delivery and peak power position in the rev range.

This in turn \'may\' affect how quickly your car revs. Lets assume you have a static motor geometry, the only thing i can think that is going to dramatically increase your change in revs is more power, or decrease in car weight.

At best, assuming you have the right cam selection (272 on an EJ isnt imo) it will increase hp which will increase the effort your engine can turn the crank therefore go through the revs faster.

a 272 is going to shift the torque curve much to the right and in my opinion actually reduce your cars power in the low and mid range and therefore be able to change its rev profile for the worse. I.e the change in revs being slower.

[Simon C]

 funkytown said:

why cams?

Because racecar? ;D

[Koom]

 Minaj']

[quote name='funkytown said:

why cams?

/quote]

To Rev out fasterr

Just lower the rev limit to 5k rpm and you\'ll hit the limiter heaps faster....

[Kiwi_Fozze]

lighten flywheel. less rotating mass = faster to rev.

cams, as stated, move power delivery.

[rex-leggy]

save the $$ and get kelfords. crower and the like are mostly made by kelfords

[R8TD_R]

 Koom']

[quote name='funkytown said:

why cams?

/quote]

To Rev out fasterr

Just lower the rev limit to 5k rpm and you\'ll hit the limiter heaps faster....

loooooool :D :D Gold

[QRAF]

i love lumpy cams ;D

[Joker]

unplug a coil = instant lump + poor economy and mean backfires on decel (not a good idea nor recommended but did not hurt my car YET, in the last few months of driving it)

cams in a Subaru/EJ20 are generally wasted as you can tune stuff on the ECU I am led to believe BUT those like Rex-leggy who have been there done that speak the troof

[QRAF]

i remember a old member had prodrive lumpy cams in his ver3 which is now own by a present member.

[Guest]

I guess my car will be the experiemnt, I have got 277 duration, 9.6 mm of lift, on both EX and IN. If power is not where I want it then I will revert back to the 256 duration it had orginally. Cams are dialled in to with adjustable cam gears.

[funkytown]

interesting measurements Russ,

from what im told a high lift (10mm +), 264 duration cam is about the optimal position for power and driveability. hopefully yours are not to far to the right - they ARE going to be reasonable right on the torque and power curves compared to a factory cam.

[Guest]

 funkytown said:

interesting measurements Russ,

from what im told a high lift (10mm +), 264 duration cam is about the optimal position for power and driveability. hopefully yours are not to far to the right - they ARE going to be reasonable right on the torque and power curves compared to a factory cam.

I will hvae to see when it\'s tuned, I guess using stm is good idea, at least then all cars are tuned at the same place.

I didnt request the profile, I told the susposid experts who only make cams and are well respected in their field what the car is being used for and to match the cams for it. I will be pissed if its not where I want it and everything is too far to the right and have to change it all again. But I will if I have to.

[Minaj]

Wait, what are the ajustable cam gears for ? Do we need them with aftermarket camshafts?

[lachlan]

yes .to set the cams to the correct timing with the crank

called "dailing them in "

[Guest]

 Minaj said:

Wait, what are the ajustable cam gears for ? Do we need them with aftermarket camshafts?

Probably a good idea to have them, but they are not exactly easy to find, took me boody ages to get them and had to change other stuff to get them to work. You can find chinese versions of them but no way in hell am i using cheap cam gears they are too important.