Hey All,

I recently traded some stereo work for an Edelbrock cam and intake for my 2.8L (Cam 3790 and Intake 3785).

Upon aquiring the parts, I looked them up in my catalog and found that it says "not for computer controlled engines". WTF? I'm trying to put this in my 89 RS.

I called Edelbrock to sort this out. They say that it is for 82-85 2.8L with carb's. Odd.....the intake looks just like the one in my car?!?! They don't recommend putting it in, not even the cam. They say that it will make my car run rough, at best.

Are they covering their butts, blowing smoke, or telling the truth? Granted they should know what they're doing, but is there a difference between carb and injected cams? The numbers can be found at http://www.edelbrock.com/automotive/cams_chevy.html

Any help would be great as I want to plop this in (.42" valve lift!)
The cam has never been used and includes new lifters. I would hate to put it in to find they were right, and then try to sell them used.

Thanks Again!

 

It may be BS on the cam, not sure on the intake though.

Just like a new crate 3.4 says for non computer 82-85 trucks.
But everyone can use the 3.4 crate motor. Its an emmsion thingy I believe, so they only "make" them for the carbed engines.

Matt

 

I'm just taking a shot in the dark, but I would guess that a carbed cam and an injection cam are different. I would expect the injected cam to have a shorter dwell on the fuel intake.

 

Well.....the emission thing I can believe. I don't think Edelbrock wants to be caught saying "go ahead" if they know it won't pass emissions. Fortunately for me, my county doesn't have emissions inspections!

If anything, I would imagine that a carb'd cam would have a longer intake, due to the restrictions that come with a carborator. But what do I know. I'm going to contact the Vehicle Research Institute at WWU and see what they say about this subject.

Thank You

 

Well the crate 3.4 is like that, it come complete with a cam, and is said for non computer carb trucks but many peple have drop them in pace of a mpfi 2.8 with great results.

Matt

 

if you try to put too radical of a cam in your computer controlled engine, it will not run correct. You will have crappy idle, not very good power and it will stall alot. The computer is programed to work with the stock cam, any any cam that deviates too far from the stock cam specs will not run like it "should"

You could install it and see if the computer can cope with it, but more than likely you will either have to reprogram your ECU or just get one of those JET chips or something.

 

The specs on that cam look very mild,I doubt that you would have any problems , it looks very much like a cam Crane list.

 

I am hoping that this is true. I really would love to put this in. I just can't figure out how the cam could make that much difference. Wouldn't the ecm just worry about making it run at stoic? And if thats the case, if it was running too rich it would just lean it out?

The cam shouldn't be that bad. But by bad (Lee7), do you mean have alot of valve overlap? This cam is one of the mildest cams that Edelbrock makes, and the only one for the 2.8L.

 

overlap and duration can cause the computer to mess up. The cam you have look fine tho, should work decent with the stock computer.

I dont get how the intake you have would work, the intake you have if im not mistaken, is for a carb engine, not for fuel injection.

To my knowledge, nobody makes an aftermarket intake for fuel injected 60degree V6's.

 

if you switch to the mpfi intake and ecm and use the 86-89 v6 maf wiring and computer itll do with the new cam.

 

Did you even read that post??? he has an 89 RS and that is what he wants to use the parts in.

Matt

 

i don't know if this helps at all, but if the intake is for a carb it wont work with your FI engine. the MPFI has a dry manifold, and as far as i know, the carbed intake is wet. now i could be wrong, or talking aboug something completely different.

 

worth checking out.

http://www.60degreev6.com/index.php?p=pages&pid=25

 

Gumby - thanks a lot for that link! I have been looking for a site like that for quite some time. Maybe I'll start looking for a 3.1L crank as well!

I know the difference between a carborator intake and an EFI intake, give me some credit will ya. I have already put in new lifters and rebuilt the top-end about 20K ago. Total mileage is 160K. I know its up there but the engine is still strong. Quite the looker too Since I did my intake mods and TPI bypass, I'm pulling 24-26mpg

Lee7 - The intake that I have is the lower intake. The top of the manifold is flat, with the runners go straight out from the head port and then curving up. Looks like it will line up straight with my MPFI middle manifold. I'll try to take a picture for you tonight.

 

blue89,

tell me the specs on the cam U have

Im running a crane 2030 (idle is kinda bad...but still I can live with it)

i have a 204-214 with .423 on both intake and exhaust...

you can run upto .443 on the exhaust (wolverine blue racer) with teh computer i think ...

 

the idle on the 2030 cam should not be bad at all, it is pretty close to stock specs.

If your idle is bad i would think its something other than the 2030 cam.

 

89camaro-

Spec's can be found on the link at the top of the post. Had a question on your intake though. Complete Intake Manifold? Explain for me. Also, when you ported/polished your intake, did it make a difference? One more, did the Hypertech Chip let it idle and run better with the cam you put in?

All-

I read somewhere that the 3.1-3.4's have better valve seats. But then I also read that putting the 2.8 heads on a 3.x makes for a higher compression? Did they really change the heads and is it a good idea to get these heads on my 2.8 with the new cam?

Lee7-

You say that the cam will work. Do you make this assumption based on the lobe separation and duration? I might be having a weekend open here in the next couple of weeks.



Just as a general note - I pulled 27.7mpg on the highway!

 

idle on the 2030 isnt bad if its used just alone...i use higher # injectors and porting and polishing makes a huge difference...

it idles like a drag car...maybe ill post some audio clips later...
with teh 2030 i saw only high end gain ....

 

yeah i ported the upper and middle plenums as well as the lower intake manifold....gasket matching and porting made a noticable difference...you wont gain a lot in terms of hp/tq numbers but throttle response will be noticable....

also how much porting you do makes a differnce too...i used a dremel and lots of sanding drums and wheels..

 

I did some research on the cam that you have 89camaro.

Both the crane and edelbrock cams have the same lift durations and are 3*off on lobe separation. Both have about .44" valve lift.

The only thing that is different is the intake and exhaust open and close times.
Open Intake Close Open Exhaust Close
Edelbrock 5* 29* 44* 10
Crane 3 27 40 6


The Edelbrock opens later and closes later than the crane. Intake by 2* and Exhaust by 4*. Does any of you know if this is a problem or how this will effect performance or runability? I will try on my end but you guys are always my first pick. Thanks!

 

Hey, I've got a 91 3.1L. I rebuilt the engine and put in a cam with these specs
204/ 214 278/ 288 .420/.443 107/117

Port polished intake, exhaust, heads, headers. I have the stock injectors now and want to install 19# ones but the computer won't hack it. I've got the 730 ecm and AZTY bin. I'm gong to try to burn an eprom to adjust for the bigger ejectors next week.

 

Can you tell me what these specs are? I can assume based on the value but I'd rather you tell me. Or you can give me the model number. The important number's are Lobe separation and the valve opening and closing points. Other than that, all of the cams seem to be the same (within a degree or two) Thank you very much for your input! Are you doing your prom burning? We have burners here at work and I've been thinking about doing it

 

ok.. degree sep .050" 204/217 Int/exh

Degree Advance Duration 278/288

Valve Lift 420/443

Degree lobe 107/117

I have 1.6RR and double valve springs too.

 

Alright, sounds like you have more lob separation than the edelbrock, and it runs okay? Why are you re-burning your prom? Sounds like your did what I want to do, so are you happy with the work you put into it?

 

Actually, I want to use bigger injectors and I tried with the stock EPROM and it couldn't handle it. It does run very lean right now, it seems, but I'm trying to get a good scanner to check my car while it's running.