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Glenn's dragster thread
GlennLever:
May 05, 2013, 03:36:51 PM
Went testing yesterday, here is a summery
Goals, smooth out the idle, get closer to the 8.500 index
We played around with the idle, but did not make much improvement on the idle
First run
Air Density 1973
Top Pulley 58 (went bigger here)
Pill 70
Fuel Pressure 81.98
Top end Boost 9.67
60 foot 1.263
¼ mile 8.548 154.42
Comments, for and 8.5 index this is close, it was a dude on the top end, EGT’s right side very low and uneven, feel so sloppy thought I would not be able to run it this slow for the season so made the decision to see if we could get to 8.00 instead of running 8.500 and if the motor couldn’t take it so be it.
Second Run
Air Density 2052
Top pulley 54 (more air, make it leaner)
Pill 70
Fuel Pressure 82.08
Top end Boost 11.30
60 foot 1.222
¼ mile 8.319 156.79
Comment, sounded strong, EGT’s were much more even right side lower than the left, felt like it was working, made the decision to run 8.500 for the rest of the season to save the motor.
Third Run
Air Density 2077
Top pulley 57
Pill 70
Fuel Pressure 79.43
Top end Boost 9.67
60 foot 1.260
¼ mile 8.459 154.85
Comment, sounded ok, want to go faster, but will resist. EGT’s right side over 100 degrees cooler than the left side.
Fourth Run
Air Density 2045
Top pulley 58 (less air)
Pill 75 (less fuel)
Fuel Pressure 76.24
Top end Boost 9.34
60 foot 1.237
¼ mile 8.455 154.47
Comment, sounded ok. EGT’s right side over 200 degrees cooler than the left side. Upper RPM curve is smooth on the graph.
Left head needs to come off and be sealed that same way we did the right after the first start up. It is leaking. New item on turnaround list, check valve cover bolts for tightness, ask me why.
All testing today was done without a shift light as it quit working, all shifts were within 100 RPM of 6300, most were less than 50 off.
Graph below is off the fourth run
GlennLever:
Today at 03:37:08 PM
Well it seems like I was just here, only on the other side. I hope this is the last time this season I am pulling heads for coolant leaks
Once again there is no obvious leaks present
The trailer looks like a race trailer now, at lease the weather is good.
The offending head is on the work bench to be cleaned up and reinstalled
GlennLever:
I was also in my trailer today, Steve was over. I got the head off, sealed the coolant leak up, head back on, valves set, and the NEW BLOWER on.
Looks like rain tomorrow, I think club racing will be rained out, and my swap meet is Saturday morning rain or shine, Saturday afternoon may be OK to see if it runs and does not leak. If it does Matt might finally get his wish and see the radiator, pump etc go away.,
ricardo1967:
Glenn - That's a nice looking blower... say more please.
GlennLever:
--- Quote from: ricardo1967 on May 09, 2013, 10:21:52 PM ---Glenn - That's a nice looking blower... say more please.
--- End quote ---
It is the new Littlefield.
What was on the engine was a modified retro high helix anodized stripped used blower that I picked up three years ago.
I finally put it on this past winter in the attempt to pick up 3 tenths so that I could run an 8.5 index.
I went to the gasser drivers meeting this April and they had inserted into the rules "standard roots blowers only". What they had done is copied out of the NHRA rule book heritage series rule book the wording on blowers, no realizing that NHRA had amending that rule specifically allowing high helix blowers. The rule makes no sense when you think about it because it is a index class.
So. I contacted them and than ordered this blower (they have now realized the mistake, but to late for me).
This is a "Standard 8-71" anodized stripped blower. As the blower is bagged I saw no reason to pay for the polished version. The bottom front half is completely open and the rear is a delta. the top hole is shorter and the case "raps" around the rotor much farther than the old style. The end plates have been strengthen. http://www.littlefieldblowers.com/products.shtml
Right now it is so tight you can hardly turn it over with your hands and a large pulley on the top.
I'll report on performance difference once it is broken in.
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