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Drag Chevette
Joined: 18 Sep 2007
Posts: 458
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 Posted: Sun Jul 13, 2008 8:21 am Post subject: Current Carb specs.... |
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| Eric68 wrote: |
For Drag Chevette or others racing on E85 I am interested in knowing if you are racing with a lean tuneup for consistency or any other little tricks that work with E85. |
my BG specs:
PMJ – 83
SMJ – 92
Power Valve – 5.5 (pulls 8" at 1300 rpm idle)
PVCR -- .093 (more fuel under trans brake makes the
car not shake)
IFR .038
IAB -- .063
HSB -- .026
Booster -- .170
anti-siphon -- .028
eholes -- .029,Blank,.029, Blank, .029
Accel pumps are both 30cc
pump cams -- pink
squirters -- .031 (hollow screw)
I stage my car at 170* and during the pass I may see a 8* change in water temp, my top end EGT is around 1280*. The EGT are a bit high for my liking but that could be the fact I have it 1 1/4" from the head.
I could go a step fatter, but im not sure I would want to at this time.
the car seems to be hitting the numbers right on every time.....
what do the rest of you have for Carb Specs? whos carb? |
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Eric68
Joined: 01 Nov 2007
Posts: 331
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| Posted: Sun Jul 13, 2008 11:13 am Post subject: |
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My tuneup is pretty close to what is has been with a couple minor exceptions. I cut and pasted your format and edited my numbers in so you can compare side-to-side.
AED Holley 850 based carb with Proform base plate and AED billet metering blocks.
PMJ – 84
SMJ – 93
Power Valve – 10.5" (pulls 8" at 950 rpm idle)
PVCR -- .077"
IFR .046"
IAB -- .058 PRI .062" SEC
HSB -- .031
Booster -- .180
anti-siphon -- plugged
eholes -- Blank (top), .028 (2nd), Blank (3rd), .028" (bottom)
Accel pumps are both 50cc
pump cams -- brown (front position #2, rear position #1)
squirters -- .045" (hollow screw)
_________________
E85 racer and E85 carb builder
www.horsepowerinnovations.com
E85 powered 68 Camaro street car
Best ET on motor 9.96 @ 133 MPH, 5.92 on N2O in the 1/8th |
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89shortbox
Joined: 04 Nov 2007
Posts: 153
Location: Michigan
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| Posted: Sun Jul 13, 2008 4:32 pm Post subject: |
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Carb is a Proform main body 750 with holley base plate.
Quick fuel E85 metering blocks.
PMJ – 80
SMJ – 97
Power Valve – 10.5
PVCR -- .112
IFR .043"
IAB -- .082
HSB -- .025
Booster -- Factory Gas
anti-siphon -- ?
eholes -- Blank (top), .028 (2nd), 0.028 (3rd), .028" (bottom)
Accel pumps -- Pri 30cc Sec. 50cc
pump cams -- Pri Pink Sec. brown (Both position #1)
squirters -- Pri. .043 Sec. .025 (hollow screw)
N/S .130
Tuned on a 350 sbc 12.5 comp, solid roller cam. Made 550hp on 110 oct. race fuel.
_________________
----------------------
89 S10
406 SBC Twin Turbo BT
Going E85 this coming season
HAHA, the season is alreay gone to another season. |
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440Jim
Joined: 01 Jan 2008
Posts: 188
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| Posted: Tue Jul 15, 2008 9:52 am Post subject: |
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I modified a Holley 950HP carb. So far this is what I am running:
PMJ – .129" (drilled)
SMJ – .129" (drilled)
Power Valve – 3.5
PVCR -- .070"
IFR between 0.032 and 0.040 (not changed from original gas)
IAB -- .063
HSB -- .028
Cross channel to booster -- .157"
anti-siphon -- stock
eholes -- .029", plugged, .029"
Accel pumps are both 30cc
pump cams -- pink
squirters -- .037(front), 0.040(rear) (hollow screws)
0.130" SS needle and seats
7 psi fuel pressure at idle (6 WOT)
Last edited by 440Jim on Sat Jul 19, 2008 8:02 am; edited 2 times in total |
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89shortbox
Joined: 04 Nov 2007
Posts: 153
Location: Michigan
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| Posted: Tue Jul 15, 2008 6:54 pm Post subject: |
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440Jim,
Are you running Meth jets??
_________________
----------------------
89 S10
406 SBC Twin Turbo BT
Going E85 this coming season
HAHA, the season is alreay gone to another season. |
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Drag Chevette
Joined: 18 Sep 2007
Posts: 458
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| Posted: Tue Jul 15, 2008 10:07 pm Post subject: |
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Jim and Short,
right now your pulling on the boosters really hard and dumping a ton of fuel down low in the RPM band,,,
I would try to open the boosters up to a minimum of a .165 this will decrease some of your down low flow and ad it to the big end where your loosing fuel from the restriction.....
by doing this you should accelerate quicker and yet have the fuel to carry you through the big end of the rpm band.
just a suggestion....your gas boosters are restricting the top end flow needed.
keep us posted.
Mark |
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68LAR
Joined: 22 Feb 2008
Posts: 34
Location: South Park, Pa.
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| Posted: Wed Jul 16, 2008 10:20 am Post subject: |
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Here's my current carb set up:
Carburetor: Q-Series 1050-AN
6/17/08 Pri Jet:gas#83 E85 #92
Sec Jet:Gas#91 W/Jet extensions E-85#99
P.V. Pri:Gas 3.5 E-85 #6.5
P.V. Sec.Gas Plugged E-85 plugged
P.V.C.R. Gas.059” E-85 Front only.067”
Pri. Nozzle: Gas#33 E-85 #40
Sec. Nozzle:Gas#37 E 85 #43
Acc. Pump:Gas 30cc Pri and 50cc Sec E-85 50cc Pri and Sec
Pump Cam: Gas Pink front/ brown cam E-85 brown cams
Idle Air Bleeds:Gas.073” E-85.063”
High Speed Bleeds:Gas.032 E-85.029"
Emulsion Bleeds:Gas 028” top to bottom E-85 unchanged
Floats: Gas Brass front/poly rear notched E-85 Brass
Idle Restrictors:Gas 035” pri/sec. E-85 .042” pri./sec.
Needle and seat Gas .120 viton E-85 .130 stainless
I'm still tuning and have been to the track one time with E-85. My best last year on gas was 11.72. My first outting I went an 11.8. I think I'm a little lean and will continue to tune. My gut tells me that I'm going to best my previous best using E-85.
_________________
'68 Roadrunner 440 4 speed
3900#street cruiser.
Best et 11.60 @ 120mph with 1.62 60' time |
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Eric68
Joined: 01 Nov 2007
Posts: 331
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| Posted: Wed Jul 16, 2008 1:26 pm Post subject: |
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I vote to make this thread a sticky. Some darn good info for E85 carb guys here !!!
_________________
E85 racer and E85 carb builder
www.horsepowerinnovations.com
E85 powered 68 Camaro street car
Best ET on motor 9.96 @ 133 MPH, 5.92 on N2O in the 1/8th |
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Drag Chevette
Joined: 18 Sep 2007
Posts: 458
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| Posted: Wed Jul 16, 2008 7:20 pm Post subject: |
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| Eric68 wrote: | | I vote to make this thread a sticky. Some darn good info for E85 carb guys here !!! |
second that vote! |
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89shortbox
Joined: 04 Nov 2007
Posts: 153
Location: Michigan
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| Posted: Thu Jul 17, 2008 1:47 pm Post subject: |
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| Drag Chevette wrote: | Jim and Short,
right now your pulling on the boosters really hard and dumping a ton of fuel down low in the RPM band,,,
I would try to open the boosters up to a minimum of a .165 this will decrease some of your down low flow and ad it to the big end where your loosing fuel from the restriction.....
by doing this you should accelerate quicker and yet have the fuel to carry you through the big end of the rpm band.
just a suggestion....your gas boosters are restricting the top end flow needed.
keep us posted.
Mark |
I cant argue with what youve stated. However our logs show that the
afr stays the same from lauch to finish line .
NOw on this motor the main seems to pull hard at 3000 RPM. So to get cruise jetting nice and lean it takes a 73 -74 pri. jet. Now we tried this on Erics car and it cruise lean with a 80 pri. jet. Bigger motor. But both motors with the current jetting are the same AFR under full throttle . But with a 73 jet up front we can get enough fuel through the PVCR to compensate. Thats why the PVCR is so big.
IM installing .170 boosters in my HP950 and see how things go. Might stick it on this 350 for comparison purposes .
_________________
----------------------
89 S10
406 SBC Twin Turbo BT
Going E85 this coming season
HAHA, the season is alreay gone to another season. |
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Eric68
Joined: 01 Nov 2007
Posts: 331
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440Jim
Joined: 01 Jan 2008
Posts: 188
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| Posted: Sat Jul 19, 2008 8:17 am Post subject: |
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My jets are simply drilled. I have run both factory #99 jets and these .129" jets with little difference.
The hole in my main body leading to the booster is .170" (stock), so perhaps drilling the metering block cross passage even more than I already have (.140 to .157) will help, especially since the main well at the top is .177 at the siphon, and .189 above it. The booster is the factory gas 950HP part, downleg style.
Footbrake staging at 2500 rpm gives a nice Lambda of 0.83, but it is leaner going down the track, but never goes leaner at the end of the run. It isn't perfect, but works OK.
What is the part number of the .170 booster for the 950HP and what is needed to install it? |
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Eric68
Joined: 01 Nov 2007
Posts: 331
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| Posted: Mon Jul 21, 2008 1:25 pm Post subject: |
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| 440Jim wrote: |
What is the part number of the .170 booster for the 950HP and what is needed to install it? |
Brasswell sells a .170" alky style downleg booster, just give them a call or take a look at their website.
You can buy a tool for about $290 from AED I believe. 89Shortbox is a professional tool and die EDM guy and is working on a homemade version. He has installed a couple with his prototype tool not sure if he is interested in making more tools or not . . .
_________________
E85 racer and E85 carb builder
www.horsepowerinnovations.com
E85 powered 68 Camaro street car
Best ET on motor 9.96 @ 133 MPH, 5.92 on N2O in the 1/8th |
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440Jim
Joined: 01 Jan 2008
Posts: 188
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| Posted: Wed Jul 23, 2008 10:04 am Post subject: |
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Thanks Eric,
For the cost of the proper installation tooling, I will leave that to a carb shop if I ever decide to try a different booster. |
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Drag Chevette
Joined: 18 Sep 2007
Posts: 458
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| Posted: Wed Jul 23, 2008 12:09 pm Post subject: |
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| 440Jim wrote: | Thanks Eric,
For the cost of the proper installation tooling, I will leave that to a carb shop if I ever decide to try a different booster. |
see if you can find a 950 methanol main body and swap your air bleeds into it...swap out the main bodies and go with it....
this should put you up around .177 on the boosters, but yet keep the rest of your parts. |
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