new combo missing a bunch of power? - Page 5

joespanova · 05-19-2017, 08:08 PM

O.P...........
You never said anything about cranking pressure , what's it pump?

pfordamx · 05-23-2017, 11:13 AM

I'll hopefully find out how much it pumps this weekend inbetween work and my son's birthday i didn't get to touch the car last weekend.

Thanks for all the input. i'll get back with compression test #s as soon as i can.

randy wilson · 05-26-2017, 10:31 AM

Are you running the same carburetor?

pfordamx · 05-26-2017, 03:08 PM

The car has only been ran with one carburetor we do have another carb we could test. but this combo has only seen one carb so far and its new so its not a proven deal. we do have another carb we could test in its place but i'm thinking the carb could be way off and it should still be better than it is.

Hacksaw · 05-26-2017, 04:23 PM

I know two posts already stated this, but have you checked for WOT. Put someone in the car and work the throttle as you check it under the hood.

pfordamx · 05-26-2017, 05:00 PM

Yes wide open throttle has been confirmed.

Ed Carpenter · 05-27-2017, 01:12 PM

Timing? If we take out 10 degrees our car is .90 slower

pfordamx · 05-28-2017, 12:06 AM

worked on the car today and have seemingly struck a possible major part of the issue. first off we ran a compression test the variance was from 210-214 i think this roughly were it should be. verified tdc, phased in the distributor. and pulled out the msd digital 6 and blaster 2 in favor of 7al2 and HVC pro power coil and installed new spark plugs and plug wires. the spark plugs are the interesting part after talking with our carb builder on the phone today and sending him pictures of used plugs he calls back and says i didn't even look at the electrode and i can tell you your problem. those are a number 7 resistor plug you need a none resistor plug, that plug is way too cold and he gave me a part# for the proper plug. and the difference was immediately noticeable we don't have track #s to confirm its fixed but god it sounds crisper and is way less fat it actually seemed to burn the fuel it was the biggest difference i've ever seen in a motor the idle went up it was previously set at 1200 and it was trying to idling 2k this could be partially timing we set it as close as we could without the motor on but didn't verify with a light yet. but it was like a happier more rev happy engine all around hopefully get to go test and tune friday.

pfordamx · 06-11-2017, 11:35 PM

took car out this weekend and new plugs uncovered lean condition car was popping at high rpm on the first pass went a 12.00 at 109, not much difference so we made a drastic jet change went from 104 square to 110 square, tried it again car went 11.42 at 116 obviously liked the fuel but we didn't have any more jet with us called carb builder and he said if we had some to put a .021 bleed in it or put more jet in it but its all ready on the high side of normal. didn't have either at the track or house. So we took the car home took off the 4150 and swapped on a dominator that we had modified for e85 by mark sullens. and went back the next day but all they were running was 1/8th so we decided to run a 7.00 index class the car went 7.18 at 93 the previous evening figured if it picked up a number it wouldn't be that far off. anyhow first pass off the trailer went 6.86 at 99 thought thats awsome 3 tenths in the eighth now thinking we need to slow down lowered the shift point 500 went 6.86 at 99 agian lowered it another 500 but it cooled off a bit and went 6.80 at 101 finally took 5 degrees of timing out and went 6.90 left it there went two rounds 60fts were in the 1.48 to 1.51 and it blew the tires off in the last round i'm not actually sure why. anyhow its still a vast improvement and the cars still isn't where it should be but its a much better starting point. and well be sending our 4150 e85 carb to mr sullens to fix the builder who i won't slander mistakes. odd part is dominator picked up almost .4 and 8 mph in the 1/8th with 103 jets that came in it so theres obivous fuel flow issues in the other carb and the dominator didn't drink near as much fuel as the other 4150.

05-19-2017, 08:08 PM	#41
joespanova Senior Member Join Date: Jun 2011 Location: Ga. Posts: 521 Likes: 7 Liked 13 Times in 11 Posts	Re: new combo missing a bunch of power? O.P........... You never said anything about cranking pressure , what's it pump?

05-23-2017, 11:13 AM	#42
pfordamx Member Join Date: Sep 2011 Location: Oklahoma City, OK Posts: 214 Likes: 3 Liked 7 Times in 5 Posts	Re: new combo missing a bunch of power? I'll hopefully find out how much it pumps this weekend inbetween work and my son's birthday i didn't get to touch the car last weekend. Thanks for all the input. i'll get back with compression test #s as soon as i can.

05-26-2017, 10:31 AM	#43
randy wilson Senior Member Join Date: Jan 2007 Location: N/A Posts: 882 Likes: 0 Liked 20 Times in 20 Posts	Re: new combo missing a bunch of power? Are you running the same carburetor? __________________ don,t have one

05-26-2017, 03:08 PM	#44
pfordamx Member Join Date: Sep 2011 Location: Oklahoma City, OK Posts: 214 Likes: 3 Liked 7 Times in 5 Posts	Re: new combo missing a bunch of power? The car has only been ran with one carburetor we do have another carb we could test. but this combo has only seen one carb so far and its new so its not a proven deal. we do have another carb we could test in its place but i'm thinking the carb could be way off and it should still be better than it is.

05-26-2017, 04:23 PM	#45
Hacksaw Senior Member Join Date: Sep 2016 Posts: 838 Likes: 148 Liked 276 Times in 151 Posts	Re: new combo missing a bunch of power? I know two posts already stated this, but have you checked for WOT. Put someone in the car and work the throttle as you check it under the hood.

05-26-2017, 05:00 PM	#46
pfordamx Member Join Date: Sep 2011 Location: Oklahoma City, OK Posts: 214 Likes: 3 Liked 7 Times in 5 Posts	Re: new combo missing a bunch of power? Yes wide open throttle has been confirmed.

05-27-2017, 01:12 PM	#47
Ed Carpenter Live Reporter Join Date: May 2006 Location: Dripping Springs, Tx Posts: 2,697 Likes: 185 Liked 502 Times in 125 Posts	Re: new combo missing a bunch of power? Timing? If we take out 10 degrees our car is .90 slower __________________ Ed Carpenter 2005 Chevy Cobalt A/SM Race Engine Development

05-28-2017, 12:06 AM	#48
pfordamx Member Join Date: Sep 2011 Location: Oklahoma City, OK Posts: 214 Likes: 3 Liked 7 Times in 5 Posts	Re: new combo missing a bunch of power? worked on the car today and have seemingly struck a possible major part of the issue. first off we ran a compression test the variance was from 210-214 i think this roughly were it should be. verified tdc, phased in the distributor. and pulled out the msd digital 6 and blaster 2 in favor of 7al2 and HVC pro power coil and installed new spark plugs and plug wires. the spark plugs are the interesting part after talking with our carb builder on the phone today and sending him pictures of used plugs he calls back and says i didn't even look at the electrode and i can tell you your problem. those are a number 7 resistor plug you need a none resistor plug, that plug is way too cold and he gave me a part# for the proper plug. and the difference was immediately noticeable we don't have track #s to confirm its fixed but god it sounds crisper and is way less fat it actually seemed to burn the fuel it was the biggest difference i've ever seen in a motor the idle went up it was previously set at 1200 and it was trying to idling 2k this could be partially timing we set it as close as we could without the motor on but didn't verify with a light yet. but it was like a happier more rev happy engine all around hopefully get to go test and tune friday.

06-11-2017, 11:35 PM	#49
pfordamx Member Join Date: Sep 2011 Location: Oklahoma City, OK Posts: 214 Likes: 3 Liked 7 Times in 5 Posts	Re: new combo missing a bunch of power? took car out this weekend and new plugs uncovered lean condition car was popping at high rpm on the first pass went a 12.00 at 109, not much difference so we made a drastic jet change went from 104 square to 110 square, tried it again car went 11.42 at 116 obviously liked the fuel but we didn't have any more jet with us called carb builder and he said if we had some to put a .021 bleed in it or put more jet in it but its all ready on the high side of normal. didn't have either at the track or house. So we took the car home took off the 4150 and swapped on a dominator that we had modified for e85 by mark sullens. and went back the next day but all they were running was 1/8th so we decided to run a 7.00 index class the car went 7.18 at 93 the previous evening figured if it picked up a number it wouldn't be that far off. anyhow first pass off the trailer went 6.86 at 99 thought thats awsome 3 tenths in the eighth now thinking we need to slow down lowered the shift point 500 went 6.86 at 99 agian lowered it another 500 but it cooled off a bit and went 6.80 at 101 finally took 5 degrees of timing out and went 6.90 left it there went two rounds 60fts were in the 1.48 to 1.51 and it blew the tires off in the last round i'm not actually sure why. anyhow its still a vast improvement and the cars still isn't where it should be but its a much better starting point. and well be sending our 4150 e85 carb to mr sullens to fix the builder who i won't slander mistakes. odd part is dominator picked up almost .4 and 8 mph in the 1/8th with 103 jets that came in it so theres obivous fuel flow issues in the other carb and the dominator didn't drink near as much fuel as the other 4150.