Bottom End Buildup...

[geoffinbc]

I know. But as of now or in the past you had to call em up and order a roller grind.

[xxrollin]

I've only herd that they were working out a cam. I never thought they had an actuall roller in stock. I guess I got to call em up. With my set-up, I'm not using a cam positioning sensor.

[Corpse]

you can get a mechanical roller cam only so far. or a hydrualic or mechanical. None of them should have the cam sensor lobe though. If you want a straight hydraulic cam with a cam position sesnor you can order a 2.8HO cam from GM. The updated version has the cam sensor part for the early style sensor.

but, who wants to downgrade?

-Dave

[614streets]

Doest some f-body buisiness sell manley aluminum rods for the 3.4?

[xxrollin]

but, who wants to downgrade?

-Dave

I wouldnt call it downgrade. If your using an aftermarket ECU and it doesnt require a cam sensor, why would that be a downgrade?? Some require it, others dont and rely solely off a crank trigger, and/or crank positioning sensor.. You got to read into em before you order em...

[Corpse]

Well yes, your standing point is like mine. By the downgrade, i meant going to a 2.8HO cam. But, I believe it is nothing but BS that tehre is a cam position sensor. Obviously with the right timing techniques in the computer there is no reason for one.

I think they use the cam sensor though cause everyone is too lazy to actually change a timing chain. And also, what does the computer do if the cam is like 12 degrees off?

I believe they should have made the computer do more work instead of adding more costly sensors. And also, they messed up the whole cam interchangeability by adding a sync ring and then on top of it, they changed the design every few years.

Now that is what I call poor design by GM.

If there is a need for a cam sensor for SFI then I don't know if I should trust the ignition system and it's advance/retard. If GM thinks we need the sensor then, that would be saying that the timing isn't very accurate. But, it is.

It's all about math they didn't want to do.

-Dave

[geoffinbc]

The cam position sensor if for fuel injection not itming. Your crank sensor is what controld the ignition

[xxrollin]

True, I know I can upgrade my ECU to run SFI and if I do, then I'll need the cam senser. I only assume its there to tell the computer when the intake valve will be opening. You'd really have to look at the program to have a better understanding of it I guess. But why a cam senser. Just one more senser to mess up leaving you stranded on the road right.......

[geoffinbc]

Why? Because its required for proper timing of the injectors. With the sensor on the cam and the sensor on the balancer the ECM can calculate which piston is ready to fire and when to give it fuel.

[xxrollin]

Really.... Wow, you learn something new everyday. Damn, I guess it must of flew over your head. So BTY, why couldnt GM just use one of the other 2 or 3 sensers already in place on the engine to fire off the SFI???

[xxrollin]

So one more thing, if the cam were retarded 4 degrees or advanced, would the ECU mess up...

[RacerX11]

Because none of the other 2 or 3 sensors on the engine can read the cam position. Thus the need for a cam position sensor. And you are wrong, it is not just another sensor that can fail and leave you stranded; if it fails, the system will revert back to batch fire mode and continue to run.

I just love the people who are scared of the simple little electronic devices on our engines. They think GM puts them on the engine to screw us over. Instead of thinking, hey, this new sensor will allow me to have a smoother idle, better emissions, and better fuel economy, they think, wow, this extra sensor is just one more thing to fail and screw me.

If you are worried about the reliability of EFI, go get a carb and distibuter and leave us alone.

Marty

[geoffinbc]

LOL and like carbs are reliable. I just did a rebuild on an 82 GMC. Man what a bitch. So many little finiky parts to keep track of. Who ever thinks EFI is complex must be the person who buys a new edelbrock everytime there carb runs rough.

Hey Racer thanks for clearing up the fact that only a Cam sensor can sense the Cam. LOL some people just dont get it I guess

[Cliff8928]

LOL and like carbs are reliable. I just did a rebuild on an 82 GMC. Man what a bitch. So many little finiky parts to keep track of. Who ever thinks EFI is complex must be the person who buys a new edelbrock everytime there carb runs rough.

Cliff Scott
89 BerettaGT
89 Volvo740
65 GTO <-would rather toss the three carbs in the trash in favor of SFI

[xxrollin]

Yeah sure. I get it but your not getting it. I havent had a problem with the factory cam senser going bad or anything, I dont think I ever herd of it happening either. I love EFI. I love the stand alone units and the ability to run the engine anyway you want. I havent had a carb'd engine except my 86 T-bird with a 302 back like 10 years ago and havent looked at a carb since. I totally understand the need for a cam senser, but the question keeps going over your heads..