Crossfire cam options/ suggestions
Thread Starter
Instructor
Joined: Feb 2008
Posts: 144
Likes: 0
Crossfire cam options/ suggestions
After doing some searching I have come to understand that the factory 84 vette has pretty small combustion chambers. Much of the information I have found seems to suggest that a cam will not do too much as a result. What have your experiences been? I want to (obviously) make as much power as possible while retaining as much of a stock look as possible.
Looking forward to your opinions/ suggestions...
Looking forward to your opinions/ suggestions...
Melting Slicks
Joined: Jan 2005
Posts: 2,658
Likes: 4
From: Clifton Park NY
I would recommend that your first mod would be to port your intake. Its a cheap and will give you good gains that are noticable, I would say at least a 35hp gain. There are other options out there that you can search out as well, but the best bang for your buck is right there!
Personally I use the 2040 cam in mine and like it. I have other mods as well. One of the best resources for mods on the 84 is located here...http://www.crossfire.homeip.net
You can easily get wrapped up in the crossfire... I have! Its a fun car to play with. I'm to the point now where I've started to do my own tuning.
Personally I use the 2040 cam in mine and like it. I have other mods as well. One of the best resources for mods on the 84 is located here...http://www.crossfire.homeip.net
You can easily get wrapped up in the crossfire... I have! Its a fun car to play with. I'm to the point now where I've started to do my own tuning.
Drifting
Joined: Feb 2003
Posts: 1,978
Likes: 2
From: San Antonio Texas
The above is good advice. psychosurfer...
The combustion chamber is not small; the 128 & 113 have smaller chambers (58cc), and that doesn't really have anything to do with the cam anyway. Perhaps you're talking about ports?
Thread Starter
Instructor
Joined: Feb 2008
Posts: 144
Likes: 0
Sounds like a good direction for a cam, thanks! I was referring to the size based on how much a cam would "matter." (a side note, I am a good parts installer, but always needing advise on what to install
) Several sources note that the combustion chamber is too small on the stock heads to optimize from the additional lift and duration an aftermarket cam would offer.
That said, Im hearing only good things, from people WITH these engines and cams that have had success.
Im gonna go hit up jegs right now and get one ordered. Ive got roller rockers on the car already. I am planning to port the intake at the same time as the cam install. Any more "moves" I should make while I'm at it?
) Several sources note that the combustion chamber is too small on the stock heads to optimize from the additional lift and duration an aftermarket cam would offer.That said, Im hearing only good things, from people WITH these engines and cams that have had success.
Im gonna go hit up jegs right now and get one ordered. Ive got roller rockers on the car already. I am planning to port the intake at the same time as the cam install. Any more "moves" I should make while I'm at it?
Melting Slicks
Joined: Jan 2005
Posts: 2,658
Likes: 4
From: Clifton Park NY
If your gonna have that much apart I would suggest changing the heads. Myself I used the Dart ss. They are iron but do flow nicely. A lot of us guys do use them. They're pretty cheap. The flow around 173cc but are advertised at 165cc. Or go aluminum, if you so desire.
But let me add to this, if your gonna change all that and to get the most out of it tuning is in your future. So think about how involved you want to get before just going out and replacing a lot.
But let me add to this, if your gonna change all that and to get the most out of it tuning is in your future. So think about how involved you want to get before just going out and replacing a lot.
Drifting
Joined: Feb 2003
Posts: 1,978
Likes: 2
From: San Antonio Texas
Like I posted above, combustion chambers really don't have anything to do with the cam. Port size does. You're getting bad info from someone who doesn't know what they're talking about.
qws... 173 & 165CC are port capacity (size), not flow. One head with a 180CC port might flow 200CFM, while another brand will flow 250CFM from a 180CC port. It pays to inquire and shop around.
qws... 173 & 165CC are port capacity (size), not flow. One head with a 180CC port might flow 200CFM, while another brand will flow 250CFM from a 180CC port. It pays to inquire and shop around.
Burning Brakes
Joined: Feb 2006
Posts: 1,098
Likes: 1
From: Webster Texas
You want an LSA of around 114, and duration of 215-225 at 50. That will keep it ECM friendly-chips don't work, forget about 'em. Porting the intake, Heads with intake runners of no more than 190cc's max-you must maintain intake flow velocity or you'll kill the low and midrange, along with the cam and you'll have a car well into the 13's.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
Melting Slicks
Joined: Jan 2005
Posts: 2,658
Likes: 4
From: Clifton Park NY
http://www.chevyhiperformance.com/te...ad_racing.html
Drifting
Joined: Feb 2003
Posts: 1,978
Likes: 2
From: San Antonio Texas
Let me rephrase: They are advertise as 165cc, but the true measured intake and exhaust port volume is 178cc. Sorry to confuse you by using the word flow
http://www.chevyhiperformance.com/te...ad_racing.html
http://www.chevyhiperformance.com/te...ad_racing.html
Melting Slicks
Joined: Jan 2005
Posts: 2,658
Likes: 4
From: Clifton Park NY
I won't disagree with your comment on AFR's heads but I never compared the two. All I was trying to say is that for those on a budget build those heads are pretty good at only $625. If the OP is going to swap heads they are worth looking into
Team Owner
Joined: Feb 2006
Posts: 24,460
Likes: 7
From: sw Ohio
'84 heads have a 76cc combustion chamber and somewhere around 160-170cc intake runners. If your heads are in good shape, then a cam will be just fine. Its the valve springs that you have to worry about breaking if they're worn out.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by Curveit
Like I posted above, combustion chambers really don't have anything to do with the cam. Port size does. You're getting bad info from someone who doesn't know what they're talking about.
qws... 173 & 165CC are port capacity (size), not flow. One head with a 180CC port might flow 200CFM, while another brand will flow 250CFM from a 180CC port. It pays to inquire and shop around.
qws... 173 & 165CC are port capacity (size), not flow. One head with a 180CC port might flow 200CFM, while another brand will flow 250CFM from a 180CC port. It pays to inquire and shop around.
On both points.
Originally Posted by psychosurfer
Several sources note that the combustion chamber is too small on the stock heads to optimize from the additional lift and duration an aftermarket cam would offer.
Originally Posted by qws
the true measured intake and exhaust port volume is 178cc.
RACE ON!!!
Melting Slicks
Joined: Jan 2005
Posts: 2,658
Likes: 4
From: Clifton Park NY
Originally Posted by CFI-EFI;1564185803
Are you saying that both the intake and exhaust ports are 178 cc? That is an awfully big exhaust port for a SBC. Actually, impossibly large. Or are you saying that someone has inexplicably added the two port volumes together, to produce a [I
Are you saying that both the intake and exhaust ports are 178 cc? That is an awfully big exhaust port for a SBC. Actually, impossibly large. Or are you saying that someone has inexplicably added the two port volumes together, to produce a [I
TOTALLY[/I] meaningless number?
RACE ON!!!
RACE ON!!!
It should have been typed as 178cc/70cc
Drifting
Joined: Feb 2003
Posts: 1,978
Likes: 2
From: San Antonio Texas
As for those heads listed above: while certainly cheap; probably Chinese, if I ordered and set up my motor for 165CC heads and they came through 178CC I'd be pizzed. Would be if the numbers were reversed too. I can see a couple of CCs off for machineing errors, but not 13. I'd be questioning the rest of the machine work myself.
Burning Brakes
Joined: Feb 2006
Posts: 1,098
Likes: 1
From: Webster Texas
Flow numbers aren't gonna hurt you, it's big port size( CC ) that will hurt the bottom-mid range power, on too small a motor. You lose the velocity. Match the heads to the engine size, and planned use.
As for those heads listed above: while certainly cheap; probably Chinese, if I ordered and set up my motor for 165CC heads and they came through 178CC I'd be pizzed. Would be if the numbers were reversed too. I can see a couple of CCs off for machineing errors, but not 13. I'd be questioning the rest of the machine work myself.
As for those heads listed above: while certainly cheap; probably Chinese, if I ordered and set up my motor for 165CC heads and they came through 178CC I'd be pizzed. Would be if the numbers were reversed too. I can see a couple of CCs off for machineing errors, but not 13. I'd be questioning the rest of the machine work myself.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by qws
Good catch! I wouldn't want to give out any misinformation.
It should have been typed as 178cc/70cc
It should have been typed as 178cc/70cc
Between two heads with equal flow numbers, the head with the smaller port volume is the better choice. The flow velocity will be higher and the ports more efficient.
Those port sizes referred to are probably, "as cast", but a 13 cc variation is HUGE and intolerable.
RACE ON!!!
Melting Slicks
Joined: Jan 2005
Posts: 2,658
Likes: 4
From: Clifton Park NY
Originally Posted by Curveit;
As for those heads listed above: while certainly cheap; probably Chinese
For me, I knew what they were before I purchased them and for what I wanted they worked.
