Six-Pac Stroker. Info for Set-Up Needed. Jetting etc:
#113864
09/02/08 03:29 AM
09/02/08 03:29 AM
|
Joined: May 2008
Posts: 48 New Zealand
Big-Mike
OP
member
|
OP
member
Joined: May 2008
Posts: 48
New Zealand
|
Help Please! I have a 440 stroker(496) It has 10:1 with 193lbs cranking pressure.18inches vacuum @ 800rpm. Comp-Cams 294solid 248@050 Lift 0.560 with 1:6 Rockers.Installed straight-up.Was using Weiand Xcelerator 7512 Single-Plane Manifold.650 D/P Holley. Were using Hughes Engines Heads,Stage 2 452's Factory Iron. Now running Stealth/440 Source which have same pressure & revability. 6800 in 1st & 2nd on 4-Speed New-Process with 2:75 Gears out back. Car wit me weighs 3960lbs & runs 12:00-12:25@117-118mph in the 1/4 mile. I have a Six-Pac set-up with Fuel Technologies Metering Plates. Something is wrong, it does not like to pull much passed 6000rpm. 64 jets centre,10:5 Power-Valve; 84 jets for end carbs. Accelerationion seems considerably less than 650 as well. Any ideas, especially from someone with similar set-up or thoses in the know.
|
|
|
Re: Six-Pac Stroker. Info for Set-Up Needed. Jetting etc:
[Re: Big-Mike]
#113867
09/02/08 08:12 AM
09/02/08 08:12 AM
|
Joined: Mar 2007
Posts: 3,275 West Coast, USA
jbc426
master
|
master
Joined: Mar 2007
Posts: 3,275
West Coast, USA
|
I was curious about the horsepower your motor is putting out. My 493 inch sixpack motor has it's horsepower peak down at around 5500 rpm and runs out of cam at just past 6000 rpm, but it sure does run good at and below those numbers.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's 1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
|
|
|
Re: Six-Pac Stroker. Info for Set-Up Needed. Jetting etc:
[Re: jbc426]
#113868
09/02/08 09:48 AM
09/02/08 09:48 AM
|
Joined: Oct 2006
Posts: 4,765
quick77rt
Parts Problem
|
Parts Problem
Joined: Oct 2006
Posts: 4,765
|
|
|
|
Re: Six-Pac Stroker. Info for Set-Up Needed. Jetting etc:
[Re: Big-Mike]
#113870
09/02/08 03:08 PM
09/02/08 03:08 PM
|
Joined: Mar 2007
Posts: 3,275 West Coast, USA
jbc426
master
|
master
Joined: Mar 2007
Posts: 3,275
West Coast, USA
|
That sounds pretty healthy. How much does that work out to at the flywheel?
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's 1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
|
|
|
Re: Six-Pac Stroker. Info for Set-Up Needed. Jetting etc:
[Re: jbc426]
#113871
09/02/08 03:16 PM
09/02/08 03:16 PM
|
Anonymous
Unregistered
|
Anonymous
Unregistered
|
Hey, another Big Mike
|
|
|
Re: Six-Pac Stroker. Info for Set-Up Needed. Jetting etc:
[Re: Big-Mike]
#113876
09/02/08 07:24 PM
09/02/08 07:24 PM
|
Joined: Mar 2007
Posts: 3,275 West Coast, USA
jbc426
master
|
master
Joined: Mar 2007
Posts: 3,275
West Coast, USA
|
Quote:
Beat this! I just put my weight & terminal speed into the Horse-Power calculator in the tech archives, & it says i make 508 HP at the wheels.
Those are some good numbers. With a 17% driveline loss, that comes out to 594 horsepower at the flywheel! I bet it sounds great when your on that chassis dyno. I would give you my jet sizes, but they would probably be a little on the rich side. When they were dynoing my motor, they kept putting bigger and bigger jets in and the horsepower kept going up until it got to that happy spot. Mine doesn't rev up like yours either, and the horsepower begins to drop off after 5500 rpm.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's 1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
|
|
|
Re: Six-Pac Stroker. Info for Set-Up Needed. Jetting etc:
[Re: jbc426]
#113877
09/02/08 07:46 PM
09/02/08 07:46 PM
|
Joined: Jan 2003
Posts: 3,675 South San Francisco, Ca
70sixpkrt
master
|
master
Joined: Jan 2003
Posts: 3,675
South San Francisco, Ca
|
Quote:
Those are some good numbers. With a 17% driveline loss, that comes out to 594 horsepower at the flywheel!
With those kind of numbers you should be dipping into the 11s.
|
|
|
Re: Six-Pac Stroker. Info for Set-Up Needed. Jetting etc:
[Re: jbc426]
#113879
09/02/08 11:21 PM
09/02/08 11:21 PM
|
Joined: May 2008
Posts: 48 New Zealand
Big-Mike
OP
member
|
OP
member
Joined: May 2008
Posts: 48
New Zealand
|
Thanks for the chat guys. I only occassionally wind it into the 6800 area if I wanna screw up Boy-Racers (Brains) in their Jappa's by takin the odd one for a ride. At the drags, i am some-what into 3rd gear,maybe half-way. It would be well in the 11's, but this is a car i can just loaf around in,&,once moving at 10mph will blow the socks off most comers. Quite happy with tall gears, afterall, low gearing only has the punch in that first instant. In low, with full tank of juice & 60ft of 5/8th chain in the boot,& the 850 on, she'll srew sideways every time even if i accelerate smoothly & then at say 50-60mph push that lasy third of throttle. Tires are 255x45x17 ZR-Sumitomo's.
|
|
|
Re: Six-Pac Stroker. Info for Set-Up Needed. Jetting etc:
[Re: jbc426]
#113881
09/02/08 11:47 PM
09/02/08 11:47 PM
|
Joined: Jan 2003
Posts: 1,374 Houston,Tx.
Lee446
pro stock
|
pro stock
Joined: Jan 2003
Posts: 1,374
Houston,Tx.
|
If your running 12.0's with a 2.76 rear, you have nothing to complain about! Why rev the engine over 6K if it does not do anything for performance? With a single 4 setup, a Holley HP 950 has made huge differences over 750 and 850's with the strokers I have been involved with! IMO, you picked a pretty good all round cam for a street car, I have never seen one with that much vac at idle, wish mine did. From all accounts, the Stealth heads run pretty close out of the box to the Eddy heads, and they dont flow enough for your combo to make max hp and probably why it does not make any more power over 6k. If you shifted around 5800 you would probably run better times at the track. Here is my combo for an all around street car. 493 stroker, 10.54-1 comp. Comp custom solid from Dwayne Porter, Porter racing heads. Specs off top of my head, 254/258@50, .582/.597 on 108*. Out of the box Eddy's with Isky 8005a springs. Hooker S/C 2" headers with 3" full(quiet) exhaust. Torqueflite trans with Dynamic tight 10" 3600 stall converter. Factory 6 pack, cold intake, staggered jetting on ends with QFT jet plates 78/84, center carb 65 mains, I believe I drilled the accel pump nozzles to .035 and used the red accel pump cam in the #2 position, stock 30 cc. pump. My vac in gear at idle was around 7" and I ran a 3.5 power valve. I am also at sea level. 69 RR with a/c and a 6 point bar, 4120 lbs w/driver.Dana 60 w/3.54 gears Best run through mufflers on 30" tall slicks, 11.48@117, average times through the muffs on Goodyear Eagle GT 2 street tires, 11.78@115, 60 ft. in the 1.80 range, but on a well prepped track, 1.74 was common. Best et's were found to be with a shift point of 5800 rpm. My cam was a little big, but when Dwayne spec'd it out, I was planning on having the heads ported which I have since done. Unfortunately, I had a garage fire that burned up both of my Mopars and the whole shop before I had a chance to run the new heads. I won't know until next spring how everything will do when I put the new car togeather, but I think it is safe to say you could benefit greatly from some proffesional porting on your heads. Also be sure you have a good fuel pump so you don't run out of fuel on the big end. With your mph, no doubt you have all the potential for low to mid 11's in street trim, a bit more gear would sure help. Hope this helps!
|
|
|
Re: Six-Pac Stroker. Info for Set-Up Needed. Jetting etc:
[Re: Big-Mike]
#113886
09/03/08 12:17 PM
09/03/08 12:17 PM
|
Joined: Jul 2006
Posts: 139 MA
limelight440
member
|
member
Joined: Jul 2006
Posts: 139
MA
|
I'll have to check my 4 corner jet notes: Don't remember a stagger. dyno'ed 650lb-ft around 3800 tops about 5400 H beam forged Ross Edel heads 1.75 header-> 3" X .5" lift custom cam 700+ rpm idle 493->11" centerforce->Hemi 4 spd->742 8.75 3.55 (Plans on a 3.54 Dana) If you want info let me know, I'd have to get it.
|
|
|
Re: Six-Pac Stroker. Info for Set-Up Needed. Jetting etc:
[Re: Big-Mike]
#113889
09/03/08 09:49 PM
09/03/08 09:49 PM
|
Joined: Mar 2007
Posts: 3,275 West Coast, USA
jbc426
master
|
master
Joined: Mar 2007
Posts: 3,275
West Coast, USA
|
If you're interested in power a little lower in the rpm range (681hp@5500RPM & 685TQ @ 4500rpm), I'd be happy to share my cam specs with you. Use even a bigger cam the numbers would only go up from there, but at the expense of some low end...
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's 1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
|
|
|
Re: Six-Pac Stroker. Info for Set-Up Needed. Jetting etc:
[Re: Big-Mike]
#113891
09/04/08 07:51 AM
09/04/08 07:51 AM
|
Joined: Jul 2006
Posts: 139 MA
limelight440
member
|
member
Joined: Jul 2006
Posts: 139
MA
|
I will have to get my notes, I will post tonite. I must correct my self minorly, as I looked at my dyno numbers again: 643lb-ft was @ 4000 548hp was @ 5100 but only hicups 10hp to 5550 This is an excel chart that I made from the dyno print out numbers. Unfortunately the full run was lost but I do have the print out from the out-boards opening (2800ish) on.
|
|
|
Re: Six-Pac Stroker. Info for Set-Up Needed. Jetting et
[Re: limelight440]
#113892
09/04/08 08:12 AM
09/04/08 08:12 AM
|
Anonymous
Unregistered
|
Anonymous
Unregistered
|
post the jetting if you get a chance.
|
|
|
Re: Six-Pac Stroker. Info for Set-Up Needed. Jetting etc:
[Re: limelight440]
#113893
09/04/08 05:56 PM
09/04/08 05:56 PM
|
Joined: May 2008
Posts: 48 New Zealand
Big-Mike
OP
member
|
OP
member
Joined: May 2008
Posts: 48
New Zealand
|
Michael; this is so good of You! Thank You so much. I don't know if you received my personal email; i was asking for your cam specs if you have them available. Also; what state are your heads; Std: or some,to major port/bowl work. My email is big-mike@xtra.co.nz if you wish to keep specs quite. Also, anyone who wishes to write direct, this is fine by me. Welcome the chat. Regards, Mike.
|
|
|
Re: Six-Pac Stroker. Info for Set-Up Needed. Jetting etc:
[Re: Big-Mike]
#113894
09/04/08 08:53 PM
09/04/08 08:53 PM
|
Joined: Jul 2006
Posts: 139 MA
limelight440
member
|
member
Joined: Jul 2006
Posts: 139
MA
|
2x 62 & 4x 93 Edelbrocks are standars 84cc (no dress work) compression I'm told ended up 10.3:1 although I thought it would have been a little higher. I keep meaning to do a hot crank over. Cam is from Cam Techniques of Sarasota Florida 941 727 5552 int & exh lift are .504 at valve 304deg (240@ .050") 104deg intake centerline installed 4 deg advanced I can give the Cam Techniques Grind Number to order if you want it. Mike: I dont' know what my email is listed as, but rest assure you can find me at chesna.mi@neu.eduMike
Last edited by limelight440; 09/04/08 08:59 PM.
|
|
|
Re: Six-Pac Stroker. Info for Set-Up Needed. Jetting et
[Re: Big-Mike]
#113896
09/04/08 11:42 PM
09/04/08 11:42 PM
|
Anonymous
Unregistered
|
Anonymous
Unregistered
|
|
|
|
Re: Six-Pac Stroker. Info for Set-Up Needed. Jetting et
#113897
09/05/08 12:30 AM
09/05/08 12:30 AM
|
Joined: Oct 2003
Posts: 2,537 PORT ALBERNI , BC., CANADA
superwrench
master
|
master
Joined: Oct 2003
Posts: 2,537
PORT ALBERNI , BC., CANADA
|
Quote:
4 93's are stout....
WOW!!! You ain't kiddin!!!
I thought my # 86's were a tad on the heavy side. Maybe he means .093"....or about a 82 jet.
That's a LOT of fuel!!!
|
|
|
Re: Six-Pac Stroker. Info for Set-Up Needed. Jetting et
[Re: Big-Mike]
#113900
09/05/08 12:50 AM
09/05/08 12:50 AM
|
Joined: Jan 2003
Posts: 3,675 South San Francisco, Ca
70sixpkrt
master
|
master
Joined: Jan 2003
Posts: 3,675
South San Francisco, Ca
|
Quote:
then i took this set-up off & put the 650-D/P with Weiand Xcelerator on & instantly had more pull & more revs as well
I was told that the sixpack manifolds are really restrictive.
|
|
|
Re: Six-Pac Stroker. Info for Set-Up Needed. Jetting et
[Re: 70sixpkrt]
#113903
09/05/08 04:38 PM
09/05/08 04:38 PM
|
Joined: Mar 2007
Posts: 3,275 West Coast, USA
jbc426
master
|
master
Joined: Mar 2007
Posts: 3,275
West Coast, USA
|
Quote:
I was told that the sixpack manifolds are really restrictive.
It's simply not true. There is room for considerable improvement, and I had mine improved at Hughes Engines getting nearly 700 hp out of my 493" motor with a hydraulic cam!! Thanks to their deep porting work, I have great lowend and some considerable topend performance out of my sixpack. I understand they've gotten even better with them since then!!!
(This from Hughes Engine's Website:
Stock average 302.2 CFM
Stock scatter 272-331 CFM 59 CFM spread
Modified average 332.6 CFM
Modified scatter 306-366 CFM 60 CFM spread STAGE 2 Average 346 CFM (44CFM more than stock) Scatter 315-374 CFM (59CFM spread)
Notes: We work on a lot of Big Block 6-pack intakes. They are probably one of our more popular ones to modify. The #1 and #4 ports are hard to improve much and without them in the mix, the modified average goes from 332.6 CFM to 342.5 CFM and the modified scatter goes from 326 CFM to 366 CFM. These are serious numbers for big block intake manifolds, especially ones that can pass for “stock”. Expect this manifold to get more flow improvement as time passes. We have dynoed a hydraulic cammed 493 cu in with stage 1 version at nearly 700HP."
Yes, there are better manifolds for more top end, but I don't think the sixpack manifolds can be considered restrictive.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's 1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
|
|
|
Re: Six-Pac Stroker. Info for Set-Up Needed. Jetting etc:
[Re: Big-Mike]
#113907
09/07/08 01:44 PM
09/07/08 01:44 PM
|
Joined: Jan 2003
Posts: 3,675 South San Francisco, Ca
70sixpkrt
master
|
master
Joined: Jan 2003
Posts: 3,675
South San Francisco, Ca
|
I just pulled #7 and #8 plug since those were the easy ones. I am running rich. I have 78 on the passenger side and 83 on the drivers side. What number should I go with? I am using NGK-BCP6ES plugs gapped to .45. It is timed at 14 initial and 35 total. I am running aluminum manifold with blocked heat cross over.
Last edited by 70sixpkRT; 09/07/08 03:06 PM.
|
|
|
|
|