84 cam need help
Thread Starter
Advanced
Joined: Jun 2013
Posts: 89
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84 cam need help
i have a a 1984 corvette with the cross fire injection, i made a stupid mistake about buying before researching. I purchased a comp cams 270H cam and matching comp cams valve springs, lifters, and valve seals. Well now i know that the cam is too big and wont run in the cross fire setup, and after talking with some tuning companys there isn't a tune that will work for me. So i am in need for a camshaft that will is stock or close to stock that will work with the stock cross fire injection setup with no extra tuning needed. The only thing i found is this from advance auto parts will this work and run properly in my 84 CFI.
http://shop.advanceautoparts.com/web...power+camshaft
If not can someone give me a link to one that will work.
http://shop.advanceautoparts.com/web...power+camshaft
If not can someone give me a link to one that will work.
Thread Starter
Advanced
Joined: Jun 2013
Posts: 89
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Duration @ 0.050", 202/206, lift .403/.415 , Lobe seperation 115 degrees
i found these as the stock specs for a 84-86. but i am not sure how to read it, because the it says 202/206 i am not sure what it intake and what is exhaust. Sorry for my lack of knowledge i am here to learn.
i found these as the stock specs for a 84-86. but i am not sure how to read it, because the it says 202/206 i am not sure what it intake and what is exhaust. Sorry for my lack of knowledge i am here to learn.
Burning Brakes
Joined: Feb 2013
Posts: 1,173
Likes: 152
From: norway
the first thing to do is to port the manifoil !http://forums.corvetteforum.com/c3-g...re-intake.html
Drifting
Joined: May 2013
Posts: 1,736
Likes: 31
From: Reno Nevada
The Comp 270H created a vacuum loss at idle, and a greater power gain in the midrange, so it idles rich, and lean at peak power. The 84 ecm has never been hacked for tuning, so going back to stock, or close will gain back the operation you desire. While the stock spec's will surely work you could consider pushing it a little. You could consider 212 / 218 on a 114 LSA and it will run with the stock ecm. Any bigger, and no way.
Intermediate
Joined: Oct 2012
Posts: 39
Likes: 3
From: Lufkin Texas
Some info from the old crossfire forum.
http://crossfireinj.fr.yuku.com/topic/669/Cams
The Powermax 2030 was very popular for an unmodified motor. The 2040 worked well for me with the ported intake. I jacked the fuel pressure up a bit at the same time.
Ken
http://crossfireinj.fr.yuku.com/topic/669/Cams
The Powermax 2030 was very popular for an unmodified motor. The 2040 worked well for me with the ported intake. I jacked the fuel pressure up a bit at the same time.
Ken
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
All you really need to do is get a cam that is "near" stock. Duration @ 0.050", 202/206, lift .403/.415 , Lobe seperation 115 degrees
i found these as the stock specs for a 84-86. but i am not sure how to read it, because the it says 202/206 i am not sure what it intake and what is exhaust. Sorry for my lack of knowledge i am here to learn.
i found these as the stock specs for a 84-86. but i am not sure how to read it, because the it says 202/206 i am not sure what it intake and what is exhaust. Sorry for my lack of knowledge i am here to learn.
As far as you purchase "mistake", CFI actually has some advantages over TPI...most people don't know it though.
Thread Starter
Advanced
Joined: Jun 2013
Posts: 89
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So it looks to me the stock can specs are extremely close to the specs on that sealed power cam that's listed in the link I put in the first post. So am I correct in thinking that cam will work perfect with the stock CFI
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Racer
Joined: Sep 2012
Posts: 259
Likes: 0
From: Montclair CA
XX fired
i have a a 1984 corvette with the cross fire injection, i made a stupid mistake about buying before researching. I purchased a comp cams 270H cam and matching comp cams valve springs, lifters, and valve seals. Well now i know that the cam is too big and wont run in the cross fire setup, and after talking with some tuning companys there isn't a tune that will work for me. So i am in need for a camshaft that will is stock or close to stock that will work with the stock cross fire injection setup with no extra tuning needed. The only thing i found is this from advance auto parts will this work and run properly in my 84 CFI.
Hi , I also have a xx-fired C4 .. I am running a Special grind Camshaft from Lunati .. This camshaft is ground for the cross fire dual throttle bodies .. I searched and searched and found the Lunati Guys really had it down pat ... this Cam Runs hard .. it's a completely new animal .. wow .. I love the healthy crisp Idle and this thing cracks in low and Mid range .. I checked my gas milke and it did drop a few miles per gallon .. Im still crackin around 20 mpg .. not bad hah !
the only mods other than stock was a set of long tubed headers , a set of used 882 heads , and I personally bored the livin pageezez out of the aluminum intake .. basically match porting , thats it
you will so love your Lunati Cammed C4 .. a real sleeper
You will love your decision
http://shop.advanceautoparts.com/web...power+camshaft
If not can someone give me a link to one that will work.
Hi , I also have a xx-fired C4 .. I am running a Special grind Camshaft from Lunati .. This camshaft is ground for the cross fire dual throttle bodies .. I searched and searched and found the Lunati Guys really had it down pat ... this Cam Runs hard .. it's a completely new animal .. wow .. I love the healthy crisp Idle and this thing cracks in low and Mid range .. I checked my gas milke and it did drop a few miles per gallon .. Im still crackin around 20 mpg .. not bad hah !
the only mods other than stock was a set of long tubed headers , a set of used 882 heads , and I personally bored the livin pageezez out of the aluminum intake .. basically match porting , thats it
you will so love your Lunati Cammed C4 .. a real sleeper
You will love your decision
http://shop.advanceautoparts.com/web...power+camshaft
If not can someone give me a link to one that will work.
Racer
Joined: Sep 2012
Posts: 259
Likes: 0
From: Montclair CA
xx fired
I love my Lunati Cam ...
i have a a 1984 corvette with the cross fire injection, i made a stupid mistake about buying before researching. I purchased a comp cams 270H cam and matching comp cams valve springs, lifters, and valve seals. Well now i know that the cam is too big and wont run in the cross fire setup, and after talking with some tuning companys there isn't a tune that will work for me. So i am in need for a camshaft that will is stock or close to stock that will work with the stock cross fire injection setup with no extra tuning needed. The only thing i found is this from advance auto parts will this work and run properly in my 84 CFI.
http://shop.advanceautoparts.com/web...power+camshaft
If not can someone give me a link to one that will work.
http://shop.advanceautoparts.com/web...power+camshaft
If not can someone give me a link to one that will work.
Melting Slicks
Joined: Jun 2013
Posts: 3,065
Likes: 39
If you want to keep the cam, you can convert it to a carburetor for probably a little more than a near stock cam, and this way you would be able to use the power of the new cam. And, if you decide to put your old cam back in, use the old lifters, if you use new lifters you will have to break in the cam again.
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
In the post w/the engine pics...Nice "hot air intake"
Racer
Joined: Sep 2012
Posts: 259
Likes: 0
From: Montclair CA
hot air ..
Negative. Carb = $600. Intake = $120, and you still need a lot more; distributor, linkages, etc. As I already posted, cam & lifters is ~$100.00
A Hot air Cam hot cam with lifters are under 250 ..
And keep the lifters on the same lobes!
In the post w/the engine pics...Nice "hot air intake"
A Hot air Cam hot cam with lifters are under 250 ..
And keep the lifters on the same lobes!
In the post w/the engine pics...Nice "hot air intake"
Melting Slicks
Joined: Mar 2012
Posts: 2,800
Likes: 456
From: USA
cam for crossfire
i just finished rebuilding the engine in my 84. I read a lot of posts from tom400cfi and others about the crossfire and ported the living heck out of my intake, till i was sure i had all that i could remove and then removed a little more. i had a gm 151 camshaft for a 327-350 hp engine that i had purchased and never used. i installed that cam and new lifters and i could not believe how well the crossfire engine ran with this setup. did nothing with the computer. it idles fine and will run way faster than i will drive it. i also replaced every vacuum line i could find on the car and set the fuel pressure to 12 psi sealed power makes a cam that has the same specs as the 151 for around $80.00. this was my experience and the manifold porting was almost free except for my time and and 2- 15.00 cutting bits. hope you get your car up and going they are sweet affordable ride when done.
the sealed power camshaft #CS179R
the sealed power camshaft #CS179R
Last edited by zachaeous; Jan 11, 2014 at 11:06 AM. Reason: camshaft number
Heel & Toe
Joined: Oct 2013
Posts: 17
Likes: 0
From: Williams Lake BC
I did this to and found a great roller cam recommend by ASSC back in the day. It is a now discontinued crane cam called 270 2S 12. It has 490 510 lift and because it's a roller it has a lot of vacuum . I also ported my stock manifold and then actually cut the top of the runners off and raised them and shortened them. I have pics if your interested. The cam is out of the car now but if your interested I'll sell it for cheap just to see it go to a good home. I also had the throttle body's opened up by ASSC. With this these mods my 84 ran 13.0 @ 105 with slicks.
Racer
Joined: Sep 2012
Posts: 259
Likes: 0
From: Montclair CA
13 's forever
I did this to and found a great roller cam recommend by ASSC back in the day. It is a now discontinued crane cam called 270 2S 12. It has 490 510 lift and because it's a roller it has a lot of vacuum . I also ported my stock manifold and then actually cut the top of the runners off and raised them and shortened them. I have pics if your interested. The cam is out of the car now but if your interested I'll sell it for cheap just to see it go to a good home. I also had the throttle body's opened up by ASSC. With this these mods my 84 ran 13.0 @ 105 with slicks.
Heel & Toe
Joined: Oct 2013
Posts: 17
Likes: 0
From: Williams Lake BC
Just because GT2Race is a die hard I'll share some other stuff. I built a 383 for the crossfire with AFR 195 heads and put it nos. The now discontinued 84 corvette kit which was two pro foggers in the air cleaner and with Lingenfelter headers,borla exhaust and slicks was able to run 11.8 @ 118 mph. No bull. Shifted at 5000 because it was a torque machine and made a bunch of Grand Nationals go home with there head in the sand. Oh one other thing I had my fuel pressure reg shimmed to 14 psi and cut the rad shroud and built a gasket to ram air the air cleaner. That's it. Have fun.
