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Author
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Topic: looking to buy new intake
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DRAGSTANG351
Journeyman Posts: 67
From: FLORIDA
Registered: Dec 2001
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posted 12-26-2001 12:32 AM
   
i have a 85 g.t. w/351c 4v heads c4 10 inch t.c.i. converter 3500-4000 stall w/4.10 gears the bottom end has been worked a little, 20/20 crank been bored 30 over balanced, rods have been worked 10.7-1 trw flatops, comp cam 270/276
648/641 solid lift, heads have 2.19 int 171 exh harland sharp 1.73 roller rocker screw in studs and guide plates heddman hustler headers mpg int and exh plates torker intake 850 dp holley msd dist 6al box all in a 3100 pound car i have only made 4 runs so far and my best e.t 7.98 @ 90 mph 60 ft time are terrible with best 1.87 in 1/8 mile the car is leaving the line around 2,500 rpm which is weak it should be around 4,000 rpm when it get's going it's starts flying, i have heard about a few intakes thru this and other forums funnelweb, tfc looks good and the blue thunder, i think i need a better converter too, if anybody has any good ideas on how i can make my combo get down the track fill free to reply and let me know i am shooting for 7.20 on motor and 6.20 w/ juice thats the goal
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n2oMike
Gearhead Posts: 2499
From: Spencer, WV
Registered: Jan 2001
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posted 12-26-2001 12:58 AM
First, you don't have near enough compression ratio for that cam. You already know the converter is too tight. You need around 13 to 1 for that HUGE bumpstick that's in the car. So what should you do? My advice is to install a smaller camshaft. Trust me, it will run better! A solid lifter cam with around 245 degrees of intake duration, a bit more on the exhaust and a 106-108 lobe seperation would be ideal. It WILL run better, and will still pull 7000 rpm. You suffer from OHCS. Overly Huge Camshaft Syndrome.  One more thing, get rid of those port plates. The intake plate will only cause reversion (along with vacuum leaks) unless you've filled the intake manifold ports up to the level of the plate. Good Luck! ------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
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kid vishus
Gearhead Posts: 6220
From: middle of NC
Registered: Oct 2000
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posted 12-26-2001 06:12 AM
Yes, get rid of the port plates, get an 8" convertor that stalls around 5500 (mine flashes 6400rpm). Call a convertor company and get one built that matches your specs. And that cam is pretty big. My cleveland runs a solid cam and it's not quite that big, 266 in, 277 exh @ .050, but I shift mine at 7500 and it has 11.5-1 compression. That torker is not a bad intake, esp for the money. I run a strip dominator, and it wasnt cheap. For a Funnelweb, a TFC, or an Active, your gonna pay somewhere around $500. $500 will pay off a big chunk towards a good convertor. Also, if your heads arent closed chamber, you more than likely dont have 10.7-1 compression. Not unless you milled alot off the heads and some off the block. I would put a smaller cam in it, an 8" convertor, take out the port plates, and play with the timing, clevelands like timing (at least the ones I have built do)
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Just Strokin
Gearhead Posts: 754
From: Tuscaloosa, Alabama
Registered: Dec 2001
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posted 12-26-2001 07:43 AM
You could use a little more gear in the rear also. What is your rpm and gear when you go thru the lights on an 1/8 mile pass?
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DRAGSTANG351
Journeyman Posts: 67
From: FLORIDA
Registered: Dec 2001
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posted 12-26-2001 11:30 AM
the 4v heads are closed chamber and they have been milled and the block has been decked the 10.7-1 compression was the piston comp i don't really know what my compression is i would put a little over 11.1 with the heads and block decked and heads shaved,so you guy's think the port plates need to go o.k i will start there i new from the start i needed an 8 inch converter but the $$ wasn't there, what should i buy next a transbrake or 8 in converter? the reason i was looking for the intake i bought it used and ramsey performance in tampa built the engine and when i took intake off to put port plates on the more i look at it someone has been porting on it and only on one side so i think i need to get an intake soon. which intake should i get? and does anyone have 1 for sale? reply with some ideas.
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Hans olsson
Gearhead Posts: 670
From: Sweden
Registered: Apr 2000
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posted 12-26-2001 01:02 PM
I?m not sure this means anything to you,but we have gone 7.49-90mph@3400lbs with a unported boss 351 alu intake(D1ZX-9425-DA).8"converter 5500 slip rpm. Motor is 351 C 4v closed chamber.I wonder what a torker would do  .------------------
- 71 Mach1 351c
- E/SA 11.89-110
- F/SA 11.92-110
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n2oMike
Gearhead Posts: 2499
From: Spencer, WV
Registered: Jan 2001
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posted 12-26-2001 01:30 PM
You can change the intake and converter, but the engine still suffers from OHCS...That cam needs 13:1 compression. Without it, the engine just won't perform to expectation.... ESPECIALLY low-end and midrange. Kid's car is a lightweight dragster and has a true 11.5 compression with domed pistons. Your lower compression heavier car needs less cam that what he's got. Your car will continue to disappoint until the engine combination gets matched up correctly. A converter will help. An intake might pick it up a tad... but it won't work right until you dig into it and change the bumpstick... Do that, along with the converter, and you'll be ready to rock! Good Luck! ------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
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kid vishus
Gearhead Posts: 6220
From: middle of NC
Registered: Oct 2000
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posted 12-26-2001 01:44 PM
If you buy a transbrake first, and that 10" convertor isnt designed for t'brake use, it will come apart quickly. And if the rest of the driveline parts arent up to snuff for the t'brake, they will come apart also, axles, u-joints, and any other weak link in the drivetrain.
As for the intake, if one side has been ported, take it off, and do the other side. I dont own an intake that I havent taken a die grinder too. I would just make both sides match first and worry more about getting a good convertor. A good convertor will pick it up a bunch. When I first started racing, I bought a 10" convertor, it was junk, it was supposed to stall 4500, after it broke, I bought a TCI 8" that was supposed to stall the same rpm, regardless of what it did stall, the car went from 12.70's in the qrtr, to 11.90's. After the TCI broke, I got a convertor from Coan,that was 6 yrs ago I still use the same convertor. Going from the TCI to the Coan picked it up to 11.50's with just a convertor change,(and since has gone 9.97 1/4, and 6.26 1/8). There is alot of et to be gained with a custom built convertor. I would buy either a Coan, or a JPT if I were buying another one new.
I would bet your compression is right around 11-1, still not enuff for that cam you are running. Plus your car is too heavy for a cam that size and you dont have enuff gear to pull it. I would replace that cam with the next step down, the 256, 266 grind in comp's book. That cam works real well. I got into the 6.60's using that cam with 10-1 compression and 2v heads.
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SG236
Gearhead Posts: 416
From: Jasper, TN, USA
Registered: Dec 2000
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posted 12-26-2001 01:52 PM
I agree with the others, your combo is a little off, the cam way off. I had the same cam in my Cleveland stroker (393) that went 6.40s in the 1/8th. The convertor I used was a 8" tci w/brake and a 1.76 glide. Comp ratio was 13:5.1 and I used a strip dominator intake with a 1050 dominator carb.I have since went to a 514" BBF but still have a set of 4V heads with BB valves and a strip dominator intake, TCI fexplate for a sbf-glide, valve covers, and a set of headers for a tune chassis car. Good Luck. Russ Hood
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kid vishus
Gearhead Posts: 6220
From: middle of NC
Registered: Oct 2000
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posted 12-26-2001 02:17 PM
quote:
Originally posted by n2oMike:
Kid's car is a lightweight dragster and has a true 11.5 compression with domed pistons. Your lower compression heavier car needs less cam that what he's got.
My car weighs 2750# with driver (and I weigh 210) I run a 4.86 gear, that coupled with the 6400 rpm convertor and t'brake, has netted a best 60' of 1.344. So it leaves hard, and I 2-step it to 4600 on a decent race track.
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DRAGSTANG351
Journeyman Posts: 67
From: FLORIDA
Registered: Dec 2001
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posted 12-26-2001 02:25 PM
thanks guy's this is a great forum all your info sounds on the money, the cam is a little stout and my converter is too tight, i can tell because it don't want to idle in gear. i'm going too look for new cam and a 8 in converter, as far as the intake i gonna need a new 1 regardless who ever started porting on it looks like they done a fine butcher job on it so i will be searching for intake 1st thing in 2002, thanks for all the good info and i will post new times as soon as i get things back in order, i'm gonna go look at the com cams now.
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