Porting Crossfire intake, first attempt, please critique
Le Mans Master
Joined: May 2006
Posts: 9,226
Likes: 9
From: Irvine Ca
Low on power? I blew the rearend out of my 84 vette. My list of repairs over the last 16 years I have owned it:
1999 intake seal -$400
2000 rebuilt trans with shift kit -$1200
2002 Rearend( should of put lower gears in) -$1200
2003 temp sensor -$40
Now no issues and I currently have about 60,000 miles on it.
Up next:
port intake maniold -free
2" TB's -$100 fellow forum member
85 fuel pump
2 different sized injectors??????? What are you talking about?????
On the xfire it had 2 different sizes??????????????????
Throw me a bone here????????
I have one of the early 84 vettes and never had a problem with it and in fact it is faster now than when it was new, with the help of these forums it is a full second faster in the 1/4 mile now and will be faster once I get my renegade intake manifold from 'Dynamic crossfire solutions", they specialize in modding crossfire cars. I will be in the 13's this summer.
I never said the intake on the crossfire is good, I have been looking for a replacement for my 84 vette for years and now somebody has actually made one that works on a 350 not that x-ram. I have an x-ram too. I just stated that the crossfire works great as in reliability not performance. I went out and bought an 85 vette because I was sick of trying to make my 84 crossfire perform under 14 seconds.
Back on topic! Back to the GM conspericy of the crossfire and why they put tiny ports on the intake manifold to make the TPI seem more powerful than the crossfire. When I get my renegade intake manifold that will fix everything.
1999 intake seal -$400
2000 rebuilt trans with shift kit -$1200
2002 Rearend( should of put lower gears in) -$1200
2003 temp sensor -$40
Now no issues and I currently have about 60,000 miles on it.
Up next:
port intake maniold -free
2" TB's -$100 fellow forum member
85 fuel pump
2 different sized injectors??????? What are you talking about?????
On the xfire it had 2 different sizes??????????????????
Throw me a bone here????????
I have one of the early 84 vettes and never had a problem with it and in fact it is faster now than when it was new, with the help of these forums it is a full second faster in the 1/4 mile now and will be faster once I get my renegade intake manifold from 'Dynamic crossfire solutions", they specialize in modding crossfire cars. I will be in the 13's this summer.
I never said the intake on the crossfire is good, I have been looking for a replacement for my 84 vette for years and now somebody has actually made one that works on a 350 not that x-ram. I have an x-ram too. I just stated that the crossfire works great as in reliability not performance. I went out and bought an 85 vette because I was sick of trying to make my 84 crossfire perform under 14 seconds.
Back on topic! Back to the GM conspericy of the crossfire and why they put tiny ports on the intake manifold to make the TPI seem more powerful than the crossfire. When I get my renegade intake manifold that will fix everything.
Last edited by jhammons01; Nov 5, 2009 at 10:01 AM.
Instructor
Joined: Jan 2006
Posts: 160
Likes: 1
From: Fl
Safety Car
Joined: Oct 2008
Posts: 4,689
Likes: 4
From: Yucaipa CA
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
Right.
I thought that you were "parting it out". Now this?
http://forums.corvetteforum.com/c4-p...le-bodies.html
LOL. That data is already available.
I thought that you were "parting it out". Now this?
http://forums.corvetteforum.com/c4-p...le-bodies.html
LOL. That data is already available.
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Safety Car
Joined: Oct 2008
Posts: 4,689
Likes: 4
From: Yucaipa CA
Right.
I thought that you were "parting it out". Now this?
http://forums.corvetteforum.com/c4-p...le-bodies.html
LOL. That data is already available.
I thought that you were "parting it out". Now this?
http://forums.corvetteforum.com/c4-p...le-bodies.html
LOL. That data is already available.
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
Sure. So the ~180 CFM you flow w/your "high tech" equipment will be more valid or hold more value than others who have already flowed the intake with their "regular" equipment? I can't wait to see this. I have an intake on my bench right now, bone stock. Not for sale, but do you want to work something out? What do you intend to learn, that hasn't already been learned by others? At least it SEEMS like you're actually thinknig about DOING something. That buys you a tiny bit of credit, in my book. Maybe.
Safety Car
Joined: Oct 2008
Posts: 4,689
Likes: 4
From: Yucaipa CA
Sure. So the ~180 CFM you flow w/your "high tech" equipment will be more valid or hold more value than others who have already flowed the intake with their "regular" equipment? I can't wait to see this. I have an intake on my bench right now, bone stock. Not for sale, but do you want to work something out? What do you intend to learn, that hasn't already been learned by others? At least it SEEMS like you're actually thinknig about DOING something. That buys you a tiny bit of credit, in my book. Maybe.
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
Not for sale. The offer was as a POSSIBLE loaner for what ever tests you plan to run using your "high tech" equipment.
I'm planning on raising the runners on it, but for the moment, it sits idle.
I'm planning on raising the runners on it, but for the moment, it sits idle.
Pro
Joined: Apr 2008
Posts: 694
Likes: 1
From: Spokane WA
What is your plan weld a bunch of aluminium on top and grind away or slice thw runner open and weld taller walls. How do you propose to raise the runners? You could just buy a renegade and have 1000cfm right from the store like the others? There is plans in the future to have a top plate set up for NOS. Climb aboard the S.S. renegade, there is always room for one more.
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
How do YOU think that I would go about raising the runners?
EDIT: I'd like to know how you got that "1000 CFM" number. Where does that come from? I can assure you that the Renegade can NOT flow 1000 CFM for each runner... and the CFI, bone stock flows a combined ~1440 through all 8, so...
Last edited by Tom400CFI; Nov 5, 2009 at 07:28 PM.
Pro
Joined: Apr 2008
Posts: 694
Likes: 1
From: Spokane WA
Not when they won't sell you one, and they have none to sell. I said this liek 4 months ago (whe the Renegade was "almost ready") and I'll say it again: While you're sit around waiting for you almighty Renegade (for which you have no meaningful data), others (like the OP) are modding their cars and reaping the benefits.
How do YOU think that I would go about raising the runners?
EDIT: I'd like to know how you got that "1000 CFM" number. Where does that come from? I can assure you that the Renegade can NOT flow 1000 CFM for each runner... and the CFI, bone stock flows a combined ~1440 through all 8, so...
How do YOU think that I would go about raising the runners?
EDIT: I'd like to know how you got that "1000 CFM" number. Where does that come from? I can assure you that the Renegade can NOT flow 1000 CFM for each runner... and the CFI, bone stock flows a combined ~1440 through all 8, so...
Instructor
Joined: Mar 2005
Posts: 129
Likes: 0
From: Layton ut
Most of you know this, but you can't just add up the flow of all 8 cylinders because the air pulses through them and doesn't just flow through at full velocity all the time. So even though all 8 runners at full flow might need 8*180=1440, you'll only need 600 CFM or so to support them on the actual engine. Remember the intake is only sucking on one of the 4 strokes.
I heard once that stock manifolds suck and ported stock manifolds suck less. So I bought an aftermarket manifold for my TPI and it sucked slightly less than my ported stocker. Finally, I figured out that the bend where the intake and the head meet is a major design flaw and really reduces flow even if the runners themselves flow ok. I put on my HSR and never looked back.
I wish I had a flow bench because I would take Tom's stocker and bolt it up to my ported 113s and see what the intake and head system would flow. Then I'd port out the CFI and test that. Then I'd put on a stock 1978 camaro intake and see what that would do. I bet that crappy carbed stocker would net more flow through the intake and head system than a fully ported CFI on the same head just due to the straighter shot into the head.
I heard once that stock manifolds suck and ported stock manifolds suck less. So I bought an aftermarket manifold for my TPI and it sucked slightly less than my ported stocker. Finally, I figured out that the bend where the intake and the head meet is a major design flaw and really reduces flow even if the runners themselves flow ok. I put on my HSR and never looked back.
I wish I had a flow bench because I would take Tom's stocker and bolt it up to my ported 113s and see what the intake and head system would flow. Then I'd port out the CFI and test that. Then I'd put on a stock 1978 camaro intake and see what that would do. I bet that crappy carbed stocker would net more flow through the intake and head system than a fully ported CFI on the same head just due to the straighter shot into the head.
Burning Brakes
Joined: Jan 2005
Posts: 847
Likes: 1
From: spring branch texas
To the OP, I don't know if anyone else mentioned it (because I was trying to sift through the BS) but you might want to double check your compression ratio with those 113's. I think you might be a tad high, if I remember right they have a 58cc combustion chamber.
Just thought you might want to verify that before you spend alot of time porting those heads.
Just thought you might want to verify that before you spend alot of time porting those heads.
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
I wish I had a flow bench because I would take Tom's stocker and bolt it up to my ported 113s and see what the intake and head system would flow. Then I'd port out the CFI and test that. Then I'd put on a stock 1978 camaro intake and see what that would do. I bet that crappy carbed stocker would net more flow through the intake and head system than a fully ported CFI on the same head just due to the straighter shot into the head.
