70sixpkRT thanks

that helps, have to find out the size on the stock plates.

Gonna measure it later today.

have the info when i get in contact with ProMax.
peter

This is the chart if you are using the Promax metering plate for the center carb.

80 jet is a .0890 drill size. I talked to Ben at Promax and he told me to run 80s. I used to have staggered jetting but I was fouling the plugs so I compromised on 80s.

My reason for suggesting drilling is because Peter lives in Stockholm Sweden & getting parts might be a challenge, though the parts we're talking about are small & could be shipped reasonably easy... As long as Customs doesn't sideline the box...

i dont think it detonation issues, what hyd lifters did you put on the voodoo cam? those cam have wierd base circles only there lifters have cups in right spot, for there cams. i think your valves are not closing all the way @ high rpms, wrong lifters or you need adj rockers for your setup. try rockers first

I bought a kit for the Lunati 60303, with cams, lifter and spring/retainer.

Drilling the metering plate 0.089"(2,26mm).
So found and drill to metering plates gonna be hard.

So front 0,089" jet
back 0,093" jet

Quote:

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So front 0,089" jet
back 0,093" jet

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That is what the Speed Secrets book says. That would put you at a 79 or 80 jet in the front and 82 in the rear. You should contact Cab Burge here on the board. He knows alot about six pack stuff and helped me out with my carb problems.

I checked a pic on the engine,no time to work on the car until tomorrow. vacumport on center carb body hooked up to both vacumpods front& rear carb.
from metering block to distributor.

Summit charge $25 for international orders, so a pair is $30 cheaper than ProMax.
peter

I thinking of drilling a pair of plates if I can find the correct size.

what kind of vacuum are you pulling?

Hi again
About 15 hg last time checked.

good vacuum signal. What PV are you running? I'm also wndering if you're outboards are opening fully.

Removed the fuel bowl for the front carb, the metering plate (34R-9716B) had about 0,0910" drill size, jet 81. So I left it as it was.

Removed the rear carb, the metering plate(34R-5113B) had about 0,0870# drill size, jet 78.

Checked the org plate stamped 35, driver side about 0,0910" drill sze, pass side about 0,0870" drill size.both were the same.

So I took one org 35 plate drilled it 0,0910"
and mounted it in the rear carb. jet size 81.

so all 4 has about 81 jet size now.

Distributor 16 intial total 30 w vacum.

Took the car for a test drive (heavy after work traffic fridays) well I got a couple of chances to try it out.
Going in second at 2000rpm and floored it, could take up to 5400RPM in second, later tried rolling slowly 1 st gear and floor it, 5500rpm, shift manually to second and 5400RPM, to much traffic to try 3 gear.

But at 5500RPM I got that sound I called detonation, perhaps thats the wrong name for the problem.running lean.


So more gas helped bring the RPM up another600-700 RPM.

Thinking of go from 64 to 66 in the center carb, what you thoughts on doing that. maybe to much?
but I think the engine wants more gas to bring up tp 6000RPM
and try without vacum, maybe have 2-4 degree more total timing. No pinging today.

PW 65, outboards open fully

Bought new colder plugs Accel 124, havn't put them in yet.

So its slowly getting there.

Sounds like you are going in the right direction. My combo may have more comp ratio and cam than yours but on my 6 packs I am now at 79 jets on the front, 68's for center and 81's on the rear. I also went from a 6.5 PV to an 8.5 PV which eliminated a hesitation when I mash the gas. My timing is straight mechanical, now set at 12' initial and 36' total all in by about 2,800 rpm. Keep at it and make notes of ALL of your changes so you can go back if need be. I keep a hand drawn 'diagram' of my carb and jet positions and every time I make a jet change I cross out the old number and write in the new one.

You are going in the right direction. What ignition are you using? I am using the MSD Pro Billet Dist. set at 14* initial timing and 35* total. Stay at it and you will get it. Oh never mind. I see you are using a stock dual point with Petronix. I have heard some people say they have had problems with Petronix.

Have had no problems with the Pertronix since installed 2004.
Running a stock dated coil (repro) with Pertronix black plug wires.

Have a set of repro dated wires waiting to go on, but have read they are no good

My 70 Challenger R/T is a match # car, try to keep everything as original as possible.
These cars run good when new (after some updating) and they should run as good today.

Did you use Promax Throttle plate on your rear carb, with the jet plates.


Concernig the fuel 98 we have here in SWEDEN, It's what you call 92 in the U.S.A. We have someting sold by Shell called v-power, and it's the same as your 93 premium.

I am running the Promax jettable plates on the front and rear carbs. Your gas is higher than what I can get here in Calif. The highest octane is 91.