cams

[Mr_Efficiency]

I admit i dont know a hole lot about cams, I know there purpose and how they work and what most of the specs mean but when it comes down to how those specs affect a motor, i'm lost.

I'm building a 2.8 with a 3400 top end with minor port work, just gasket matching and I'm running turbo all this bolted to a getrag 282.

What kind of specs am I looking for? From what i understand turbo's dont like a lot of over lap, over lap is ok just not excessive like a lot of the bigger cams.

I'm not looking for anything extreme, just a nice improvement over stock. this is mostly a daily driver but I do a lot of autoX and hit the drag strip a few times a year.

also if anyone had any links to sites selling cams that would help out to.

I've heard alot of good things about the H260, but hows it for boost?

thanks

[Superdave]

the crane H260-2 is a great cam for boost, lots of people are running it with good results.


Since you are using a Gen2 bottom end your cam choices are somewhat limited, you could always get a regrind of a new stock one, you'll probably end up needing longer pushrods depending on the lift you want.

Here is a great guide for gen2 cams: http://members.shaw.ca/betterthanyou...haft_guide.htm

[geoffinbc]

Limited? There are a lot more cams for the Gen I and II motors than there are for gen III. You can get Comp or Crane to make you a custom one if you wish.

[Superdave]

Limited? There are a lot more cams for the Gen I and II motors than there are for gen III. You can get Comp or Crane to make you a custom one if you wish.

Um.. have you checked the store here lately?

http://60degreev6.com/store/images/Cam/CamSpecs.htm

Sure they're re-grinds but the end result is the same...

[Mr_Efficiency]

awesome, thanks for the link superdave, thats just the kind of thing i was looking for.

[Mr_Efficiency]

Just out of curiosity, can i use a gen 3 roller cam in my 2.8 block if i used the correct lifters as well? then would this allow me to run the 1.6 roller rockers with stock length pushrods?

cause if not i was going to run 1.6 lifters from a 95-96 3100 cause there not roller and I can use my stock length 2.8 pushrods.

I know there not the best but its the cheapest and for the 1-2hp it gains me i dont feel like the headache of custom pushrods.

[bszopi]

Not without some decent modifications... Since the cam is a roller cam, it requires roller lifters. And the roller lifters require an anti-rotation bar, which the 2.8 block doesn't have provisions for.

[Mr_Efficiency]

ok i dont know what that is but it sounds like more work than i want to get into for this build. I'm used to OHC motors so all this pushrod stuff just throws me through a loop.

flat tappet cam it is then.

If i get an aftermarket cam like the H260-2 that everyone seems to recomend, can i still use my stock length pushrods? I'll be useing 95-95 non roller 1.6 rockers like i said above.

[Superdave]

Not without some decent modifications... Since the cam is a roller cam, it requires roller lifters. And the roller lifters require an anti-rotation bar, which the 2.8 block doesn't have provisions for.

Has anyone ever looked into what it would take to modify the gen1/2 block to accept the anti-rotation bars or gen3 guides?

The gen3 ones are just plastic, it seems like it would be easy enough to either weld in some little mounts or maybe if there is enough area drill/tap the block and run a longer bolt with a litlte collar that the guide can slide over...

Maybe this spring i'll look around for a gen2 block to check this out on, seems like it could help out alot of people...

[geoffinbc]

I think you can use rods from a 2.8L or 3.1L FWD Gen II motor. Should be close enough if your using adjustable rockers.