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Old 04-19-2005, 08:42 PM
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test and tune

I was at the drag strip on test and tune day my combo is a 327 30 over 274 xe cam,worlds heads,dual plane intake 1500 to 6500, 10.1 compression,stock delco distributor with pertronix eye and curved advance 20 initial 36 total.I was running 13.8 consistent,my weld in the slot on distributor broke so my total was real high so i backed timing of so i could finish the day it was like 10 initial and 36 or so total i ran a 14.22.I came home fixed distributor exactly like i had it went to track 2 whole weekends car will not run under 14.2 now,any suggestions please could it have done something to distributor to cause this.I did not change anything else im confused. thanks john

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Old 04-19-2005, 09:41 PM
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what gears are you running? ANy wheel spin?

K
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Old 04-19-2005, 09:52 PM
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3800 pound car,th350,2500stall,456 gear,10 inch wide slicks,no wheel spin that i notice.thanks ,also how do i tell if i have enough timing do i keep going up a couple of degrees till mhp falls off or is 36 ok.

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Old 04-19-2005, 10:13 PM
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thats not alot of difference and in the spring the weather keeps changing all the time.go up a couple degrees at a time til the time goes up or gets worsethe better the time the better the tune.i don't know what kind of lifters you have but you can even adjust them to compesate for wheel spin or low end or top end performace.tighten for low end and loosen for top end.thats just one of many things you can do.
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Old 04-20-2005, 07:37 PM
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Thanks guys.
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Old 04-20-2005, 08:40 PM
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It's possible that you could go beyond 36 degrees, I've seen a few Jon that like a little more than that. Combustion chamber design and size has alot to do with it. Sometimes, unless the balancer is indexed perfectly, your marks could be off a degree or two. In this case you can play it by ear a little.
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Old 04-21-2005, 04:18 PM
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Thanks Brian, hows nics motor coming along. Do you have any ideas how far to push the timing with out blowing it up. Its a 327 30 over,comp cams 274 xe 230 236 490 490 1800 to 6000 ,trw pistons .125 dome,S/R torquer heads 202 160 170 intake runner,67cc, roller rockers,10.1 compression,edelbrock rpm 1500 to 6500 dual plane,750 holley vacum secondaries,91 octane with 114 mix.Could the weather been perfect that day it ran 13.8 now only 14.22 i even tried to rejet and didnt get any better! 60 foot times were the same all three weekends but the et was slower need help! Thanks John
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Old 04-21-2005, 04:33 PM
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John,
"91 octane with 114 mix" - what's your proportion? 2:1? 3:1?

Denis
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Old 04-21-2005, 04:47 PM
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8 gallons of 91 3 gallons 114.
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Old 04-21-2005, 05:45 PM
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If would inch up on it, and I have ran over 38 degrees before, but that's just me. Usually 36 degrees is enough.

What is your RPM through the traps? You've lost almost a 1/2 second which is quite a bit. You've definitely lost some top end horsepower somewhere. Your 327 isn't wanting to move that big wagon through the wind on the big end. I would stick with the ignition, since you messed with it and seemed to have lost some power. Maybe you should get a piston stop and re-check TDC, mark your balancer and either make a pointer or adjust your existing one. I would spend a weekend working on my ignition curve, once you've got that then maybe move onto other areas.

While you are experimenting with timing, I would suggest running straight race gas.
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Old 04-21-2005, 05:46 PM
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Quote:
Originally Posted by john chaffin
Thanks Brian, hows nics motor coming along. Do you have any ideas how far to push the timing with out blowing it up. Its a 327 30 over,comp cams 274 xe 230 236 490 490 1800 to 6000 ,trw pistons .125 dome,S/R torquer heads 202 160 170 intake runner,67cc, roller rockers,10.1 compression,edelbrock rpm 1500 to 6500 dual plane,750 holley vacum secondaries,91 octane with 114 mix.Could the weather been perfect that day it ran 13.8 now only 14.22 i even tried to rejet and didnt get any better! 60 foot times were the same all three weekends but the et was slower need help! Thanks John
Porting the heads this evening, and will have it buttoned up tomorrow.
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Old 04-21-2005, 05:56 PM
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rpm through the traps is 6000,also i lost 2mph went from 99 down to 97,also i even took the timing cover off last weekend lined dots up on crank and cam come to find out i was almost 4 degrees slow so when i made best runs i was only at 16 initial 34 total so i went up to 18 initial 36 total car still ran 14.22 97 mph.It seems like ever sense my weld in slot broke it made my distributor go funky. I put everything back the same and still will not run like it did even with more timing.Its really consistant its not like the motors going away or something last 2 weekends made probably 15 passes within a 2 or 3 hundreths.
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Old 04-21-2005, 06:34 PM
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Maybe I'm happy today but it sounds like your setup should be running more like low 13s edge of 12s.14.2 is way off IMO.
Have you messed w/ the carb at all??Secondary springs??Got lighter and lighter till it bogs when the 4bbl opens then go up one size.Jet till ya get the most mph.play with plug gaps.Wider for topend tighter for holeshot.
With my distributors I just set it till it pings when I nail it,then back it down.Then tweak it at the track for best times and MPH.But thats on mild motors.And I don't have a light.
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Old 04-21-2005, 06:47 PM
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I have played with jetting got the most mph,if i keep jetting up i doesnt do anything ive got 72 in the front and jetted to 74 and it ran same mhp didnt lose or gain so i backed it down to 72 if i run smaller jets it makes a missing sound around 5500 so i think my jetting is fine,i have not adjusted the secondaries.
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Old 04-21-2005, 09:05 PM
E.T. divided by $ spent= Speed
 
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Secondary springs made a nice differnace in my car.
14.2 is slow for your setup.I was catching 14.5 on street tires and closed exhuast w/ 305 heads on a stock 350 w/ a cheap cam and 3.42s.
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