five7kid

iTrader: (14)

If it kills bottom end, I sure couldn't tell it. Granted, this was just with the 235-75x15 Road Huggers, but I couldn't nail it without breaking them loose until I was up to about 45 MPH.

Idles fine.

More real data Saturday at Test & Tune.

5678TA

five7kid

iTrader: (14)

It didn't translate to the track. I had the jetting set "stock" for the Proform, which should be rich at 5800'. I only had 2 real runs (screwed up the launch on the first run), acted lean but plugs looked rich (although admittedly not checked "properly") so I leaned it down; last run it acted really, really lean. Ran out of time for anymore runs.

Hopefully I'll be able to get back out before next Friday's first points race of the season.

5678TA

hopefully you get that sorted out..

xpndbl3

iTrader: (5)

if you went from dual plane to single plane i would have gone up 4 jets initially front and back and seen how that would have run. I'm not sure what design that new intake is but back to back for my buddies cars we've gone up 4 in front and 4-6 for the secondaries and it ran quicker at about the same plug reading.

five7kid

iTrader: (14)

I think I have clogged secondary fuel passages from the long winter's sleep without any storage prep (time has been at a premium this winter and spring). I was planning on going up 2 from the Proform jetting (which is roughly equivalent to 4 up at sea level) after disassembly and cleaning.

The Strip Dominator is pretty much the same as a Victor Jr.

five7kid

iTrader: (14)

Well, upon removing the carb I discovered reusing the mount gasket wasn't the smartest idea - seemed like a good idea at the time, but the mount surface is wider on the Strip Dominator than it was on the RPM Air Gap. Not sure how much difference it made, but a new one is on there now.

The carb was clean inside. The sticky residue from the similarly ill-advised use of a gasoline additive with E85 last year readily dissolves in gasoline. I went ahead and sprayed all of the passages with carb cleaner and put it back together with 2-up jets from the Proform sea level settings. Also readjusted the little things like idle.

It seems to idle up with very little throttle opening. I set the secondary blades so they made a square of the idle slot, it would idle too high with the primaries completely closed. Tweaked that around a little to get 800 in drive and 1000 in neutral - about as low as it wanted to go. Didn't check manifold vacuum, in too much of a toot, I guess.

Test drive again - it is really, really crisp off-idle. Not at all like the solid lifter/single plane SBC combo I had back in the late-70's (but I didn't know as much about tuning then, either). I had to take it to a slightly different "test on-ramp" because there was construction where I normally conduct this exercise - I just left it in drive at about 20 MPH and floored it up to 65 - nary a whimper out of it. The "real" on-ramp test was an up-hill affair, started in first at about 20 mph again, floored it, pulled smoothly up to redline, shift, again pulled smoothly up to redline when I had to shut it down to merge with the 65 MPH traffic. The engine was also warmer than it was at the track - ~175 degrees vs. 160. Maybe I need to run it warmer with those isolated runners.

On the way back, I ran out of gas about a mile from home - stupid gas gage said I still had a 1/4 tank when I left (impossible, after I thought about it). Good thing I had my gas can with me.

The full gas can. . .

(BTW, that original "45 MPH" statement was a bit of an over-statement - I was at the end of a curving on-ramp at that point, probably closer to 30 MPH, it went sideways quick on me. From the straight and facing up-hill, it just hooked & cooked.)

five7kid

iTrader: (14)

Had it out to the track Friday evening. Still seemed a little lean WOT, but was a little rich at cruise, if anything. So, I went up 4 more in the secondaries for 74/90 jetting - the biggest spread I think I've ever jetted.
It ran much better for the 2nd and last time trial, back to a 13.70. In the first round of eliminations, it ran even better, even though I dialed quicker (13.67) than I had run this year, and backed off before the traps and scrubbed 6 MPH, still broke out by .05 - Rats! It was probably a 13.56 or so run.

Oh, well, they called the race after the 3rd round due to time, so I'm only down 3 rounds. There's always this week. I think I need to bump the timing back up as well. We'll see.

5678TA

congrats on the time improvement..

now that i think about it, the intake wont kill that much low-end unless its fully port matched to some huge heads.. i went from a out-of-box rpm airgap to a 1205gasket ported vic jr. and never noticed that much difference.. and i run a manual.. alot more noticable than autos.. my dad recently portmatched to a 1206 gasket .. so we'll see how that works out.. haha.. he said he took out about an 1/8th" from the bottom of the port and 1/16th" from the sides!! HUGE difference..