Anybody port their crossfire intake or install an x-ram?

SHORT ANSWER! STOP BEATING A LONG DEAD HORSE!!

Ive been playing at the hp wars for years,your stock heads,intake, displacement and compression ratio and cam are killing performance. the cross fire intake is the worst offender as it only flow about 170cfm-190cfm
swapping to a EDELBROCK SY1 OR OFFY CROSSRAM INTAKE with CUSTOM LID removes that resriction
THE EXTREMELY RESTRICTIVE STOCK INTAKE

cfinumberd.jpg

custom lid SY1
plett_sy1_5.jpeg


compare the ports, the SY1 flows about 270cfm
plett_sy1_6.jpeg



<b>"A MODIFED EDELBROCK SY1 WITH CUSTOM TOP MATCHED TO 190CC AFR HEADS CRANE 114142 CAM -- AND add a 383 high compression engine kit"

b>
BTW Ill save you the math, youll need to get the 10:1 cpr flat top piston 383 kit for the street, and the 74cc combustion chambers AFR 190cc HEADS with L98 spark plug angles if you intend to run high test gas you find everywhere (some is lousy quality) and get the head gasket as close to .018-.022 as you can for correct quench
fyi DD-2000 and EA pro both guess at OVER a 115 hp improvement at the rear wheels, having done this type mod in the past Im reasonably sure thats UNDERESTIMATED for those listed changes

383 rebuild kit $1000
http://www.strokerkits.com/383.htm
crane cam/lifters $150
AFR heads $1200 http://www.flatlanderracing.com/cylhead_index.html
SY1 with custom lid $500-$600
DOING YOUR OWN WORK>>>>>PRICELESS! :thumbs: :thumbs:
Intakeoffy.jpg

offy
crossram-offy-tops.jpg


Part numbers are 5893 base,
http://store.summitracing.com/partd...1&part=OFY-5893&N=700+400429+115&autoview=sku

5903 for the dual-four top,
http://store.summitracing.com/partdetail.asp?part=OFY-5903

5902 for the linkage.

http://store.summitracing.com/partdetail.asp?part=OFY-5902



both SUMMIT AND JEGS CAN GET IT FOR YOU

MORE USEFUL INFO

http://www.swko.net/~lionsden/crossfire.htm

http://www.swko.net/~lionsden/crossfire1.htm

unless your rich or hopelessly masochistic get a SY1 or OFFY BASE
plett_sy1_6.jpeg

the sy1 flows close to 270cfm out of the box, a cfi flows 170-190cfm (DEPENDS ON WHICH PORT (STOCK) and theres not enought room to port without cutting/welding (EXPENSIVE AND TIME CONSUMEING AND EASILY SCREWED UP)

manifold3.jpg
manifold1.jpg

these are the STOCK CFI INTAKE RUNNERS,
carpics003.jpg

you can extensively port them
carpics005.jpg
and its a big improvement over stock.............but they are still EXTREMELY RESTRICTIVE, and its not a huge help, if your looking to make significant hp


THEY WILL NOT SUPPORT A LARGE INCREASE IN HP WITHOUT MASSIVE CUTTING AND REWELDING WORK,WHICH COSTS FAR MORE AND WORK FAR LESS EFFECTIVELY THAN AN SY1 SWAP WITH A CUSTOM LID

mismatch.JPG

this is the port work necessary to get them to flow even as pittifly as a TPI
 
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this is the port work necessary to get them to flow even as pittifly as a TPI


Hey watch it man, that silly stock TPI woke up my L48 stock '72 engine pretty good, compared to that Q on there....

power, economy, driveability, all too a huge step up....if you think a TPI is pitiful, you have to put a Q in the toilet......:lol::lol:

but I know it rund dead at 5 grand, but I"m a street driver...not a racer....
 
once youve seen the differance in hp and torque a decent intake, cam, and heads can provide when matched to a well built sbc ,you will think the crossfire and TPI are a BAD JOKE,

look the stock CROSSFIRE

http://www.stingray.nu/tips/tech84.htm


the best TPI
http://www.stingray.nu/tips/tech91.htm


random build

http://airflowresearch.com/articles/article050/A-P1.htm

http://airflowresearch.com/articles/article054/A-P1.htm

http://airflowresearch.com/articles/article032/A-P1.htm

http://airflowresearch.com/articles/article010/A10-P1.htm
 
don,t get the idea Im against the x-fire system,design, it has potential,Im just against throwing money down a rat hole!
sellecting the aftermarket crossram bases matched to a correctly matched cam, better heads and a low restriction exhaust with decent headers can make a huge improvement.
but the stock intake, heads and cam are KILLING your potential power
 
Is the SY1 better than a standard carb setup?
That 383 and SY1 setup looks expensive. I drive a crossfire and an 85 tpi because I'm poor. You mess around with these wild setups, its just not a corvette anymore in my opinion. I just want to improve upon what I got, a corvette with crossfire a.k.a rathole. I think a 383 with a SY1 belongs on a crappy nova not a vette. Besides most projects starting like that with expensive parts end up parked in tall grass with a sign on it saying $1500 OBO.
 
It ALL depends on your mechanical and fabrication skill level and your goals,
Ive converted a couple 1984 x-fire cars to the larger intakes and your correct its not cheap, but it also results in a much faster car.
Ive done it with dual carbs and Ive done it with the mostly stock TB injection
 
The sy1 has short runners, is it mostly top end track car? The offy looks to more low end torque.
 
The sy1 has short runners, is it mostly top end track car? The offy looks to more low end torque.

IVE used BOTH intakes and your cam,timing, compression ratio, engine displacement, cylinderr head design,displacement,rear gear ratio and carb or tb flow rates also have a huge effect on the engines charicteristics, alot more than the slight differance between the runner length and cross sectional area differance in the two intakes
 
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