Melted a piston - unsure why.
07-08-2018, 12:05 PM
#81
FormerVendor
iTrader: (1)
Join Date: Nov 2008
Location: Santa Ana, CA. USA
Posts: 2,157
Likes: 0
Received 16 Likes
on
16 Posts
LS engines WITH Timing Marks = NOT Hi ALL, I have yet to read about ANYONE who has installed Timing Marks on a LS engine Front Pulley/Timing Cover !
THUS every LS engine I assembly has been so marked for a "0" TDC Reference.
The ECU-882C I manufacture has that ability, the ABILITY to MAKE sure "0" TDC is read/calibrated TO BE CORRECT.
WHEN the ECU states 11* of crankshaft position that VALUE would then be known to be accurate.
The OEM GM PCM just guesses at the crankshaft position !
Lance
THUS every LS engine I assembly has been so marked for a "0" TDC Reference.
The ECU-882C I manufacture has that ability, the ABILITY to MAKE sure "0" TDC is read/calibrated TO BE CORRECT.
WHEN the ECU states 11* of crankshaft position that VALUE would then be known to be accurate.
The OEM GM PCM just guesses at the crankshaft position !
Lance
07-08-2018, 12:21 PM
#83
Launching!
Join Date: Jan 2018
Posts: 283
Likes: 0
Received 0 Likes
on
0 Posts
Another question. Why is it stoich for pump gas is 14.7, and you target say 11.2 for wot boosted, and E85 stoich is is 9.x and you target in the same 11.2 area?!? Why do you target richer than stoich on pump gas and leaner than stoich on e85?
also thank you for that Luke, Ill go convert 60* c to F so I know what Im looking at lol
also thank you for that Luke, Ill go convert 60* c to F so I know what Im looking at lol
lamda never changes. 1.00 is the same on methanol, E85, pump etc etc. 0.80lamda indicates that there is less oxygen in the exhaust (rich) in comparison to 1.00 (stoich) or 1.30 (lean)
lambda is what AFR should be referenced by to be correct.
Stoich is 1.00 lamda. from that number you get AFR. 0.80 lamda is 80% of stoich value and 1.30 is 130% of stoich value.
petrol stoich 14.7 so .80lamda is 11.76 1.30 lamda is 19.11
E85 stoich 9.6 so .80 lambda 7.84 1.30 lamda is 12.74
meth stoich 6.45 so .80 lambda 5.16 1.30 lambda is 8.38
when you select different fuel on a dyno or wide band monitor to display the right numbers is all calculated off lamda. O2 sensors read lambda and we calulate that to and AFR number.
a lot of people use pump scale for all fuel in communications which is technically incorrect. so to answer your question youre not going leaner than stoich with E85 and lower with pump. both fuels are as you refered to in AFR 0.76lambda. which is 76% or stoich lambda 1.00
correct terminology would say 11.2 AFR for pump and 7.44AFR for E85
07-08-2018, 12:21 PM
#84
9 Second Club
Hi ALL, I have yet to read about ANYONE who has installed Timing Marks on a LS engine Front Pulley/Timing Cover !
THUS every LS engine I assembly has been so marked for a "0" TDC Reference.
The ECU-882C I manufacture has that ability, the ABILITY to MAKE sure "0" TDC is read/calibrated TO BE CORRECT.
WHEN the ECU states 11* of crankshaft position that VALUE would then be known to be accurate.
The OEM GM PCM just guesses at the crankshaft position !
Lance
THUS every LS engine I assembly has been so marked for a "0" TDC Reference.
The ECU-882C I manufacture has that ability, the ABILITY to MAKE sure "0" TDC is read/calibrated TO BE CORRECT.
WHEN the ECU states 11* of crankshaft position that VALUE would then be known to be accurate.
The OEM GM PCM just guesses at the crankshaft position !
Lance
Anyone installing an aftermarket ecu who does not do this...does need a little slap though.
Although in many respects it could be deemed irrelevant. The engine will want whatever it wants, whether those numbers reflected on a computer are "correct" or not matters less as long as the engine/plug is seeing the timing etc it wants.
Of course it would be silly not to have everything baselined as correct so all numbers and values make sense. But it isnt essential.
Really....dont make it stupid rich, dont make it stupid lean, and dont detonate it. After that it should be hard to make a *****.
07-08-2018, 12:53 PM
#85
Launching!
Just for reference my forged rod and piston ly6 was tuned on pump gas and 12 psi.... currently running 22ish degrees of timing and a 11.9-12.0 air fuel.... took it to the track and ran it with a 11.4-11.5 afr..... leaned it out to the 11.9-12.0 and gained 4 mph with no changes other than fuel...... Plugs were still perfect- a little black at the base and timing mark was still safe and not even in the strap yet.... I’m carb’d and that could make a slight difference but Just read plugs, take your time adding timing and taking fuel away like stevieturbo said....
07-08-2018, 01:06 PM
#86
FormerVendor
iTrader: (1)
Join Date: Nov 2008
Location: Santa Ana, CA. USA
Posts: 2,157
Likes: 0
Received 16 Likes
on
16 Posts
UEGO Sensor + EMAP OR Exhaust System Pressure Hi ALL, YES Steve I work in Lambda.
I have fit UEGO Sensors in Turbo engines for over 32 years including the OEM Vector Car.
I should ADD, the placement of the sensor "manifold BEFORE the turbo", gas pressure effects the read.
I should add the placement of the UEGO semsor, "after the turbo into the exhaust system", a high back pressure exhaust system effects the read.
MY ECU-882C corrects for this "drift"effect when MAP is added the the UEGO Scaling.
Lance
I have fit UEGO Sensors in Turbo engines for over 32 years including the OEM Vector Car.
I should ADD, the placement of the sensor "manifold BEFORE the turbo", gas pressure effects the read.
I should add the placement of the UEGO semsor, "after the turbo into the exhaust system", a high back pressure exhaust system effects the read.
MY ECU-882C corrects for this "drift"effect when MAP is added the the UEGO Scaling.
Lance
07-08-2018, 02:41 PM
#88
FormerVendor
iTrader: (1)
Join Date: Nov 2008
Location: Santa Ana, CA. USA
Posts: 2,157
Likes: 0
Received 16 Likes
on
16 Posts
Flow Bench with BARO Reads Hi ELQ, GOOD WORK.
The board you ARE USING may (?) HAVE FOUR CHANNELS OF A/D ALLOWING YOU TO measure THE PRESSURE CHANGE IN each FLASK ( BARO Sensor for each flask), THUS FLOW MEASUREMENT !
NOW, log the PW, Frequency, Duty Cycle, Pressure change.
Your Machine will be improved.
Lance
The board you ARE USING may (?) HAVE FOUR CHANNELS OF A/D ALLOWING YOU TO measure THE PRESSURE CHANGE IN each FLASK ( BARO Sensor for each flask), THUS FLOW MEASUREMENT !
NOW, log the PW, Frequency, Duty Cycle, Pressure change.
Your Machine will be improved.
Lance
07-08-2018, 02:47 PM
#89
GOOD DaY Op! Congrats TO you on getting YOUR MACHINE back into GOOD condition! HopEFULLY the info HERE HELPS you tremendously? HavING melted PISTONS is never FUN! GET! Your COMPUTER to provIDE excellent TUNE ENGINE?
07-08-2018, 04:18 PM
#90
Originally Posted by Game ova
GOOD DaY Op! Congrats TO you on getting YOUR MACHINE back into GOOD condition! HopEFULLY the info HERE HELPS you tremendously? HavING melted PISTONS is never FUN! GET! Your COMPUTER to provIDE excellent TUNE ENGINE?
07-08-2018, 05:14 PM
#92
HELLO there COMRADE 99camaroturbo. I have USED the whizDINGBAT kaleido-oscillo-SCOPE to ****-(yze) your picture! IT seems to ME, that I have DETERMINED from MY OWN COMPUTER, the new and IMPROVED HAL9000! (extra exclamation) and we have DETECTEFIED the prescence of DAWG-HAIR on your piston SKIRT. The DOG HAIR detection SENSORS must have NOT been PULLING TIMING to account for the INDETERMINABLE prescense of DaWG-HAIRz on your ring airports.
Now! IN the Future; Tuttle will be confused with Buttle? A very merry unbirthday to you! YES YOU.
Now! IN the Future; Tuttle will be confused with Buttle? A very merry unbirthday to you! YES YOU.
hilariousness!!!
07-08-2018, 05:27 PM
#94
HELLO there COMRADE 99camaroturbo. I have USED the whizDINGBAT kaleido-oscillo-SCOPE to ****-(yze) your picture! IT seems to ME, that I have DETERMINED from MY OWN COMPUTER, the new and IMPROVED HAL9000! (extra exclamation) and we have DETECTEFIED the prescence of DAWG-HAIR on your piston SKIRT. The DOG HAIR detection SENSORS must have NOT been PULLING TIMING to account for the INDETERMINABLE prescense of DaWG-HAIRz on your ring airports.
Now! IN the Future; Tuttle will be confused with Buttle? A very merry unbirthday to you! YES YOU.
Now! IN the Future; Tuttle will be confused with Buttle? A very merry unbirthday to you! YES YOU.
07-08-2018, 07:17 PM
#97
FormerVendor
iTrader: (1)
Join Date: Nov 2008
Location: Santa Ana, CA. USA
Posts: 2,157
Likes: 0
Received 16 Likes
on
16 Posts
Carnkshaft Acceleration Measurement Hi Doug, good picture of the damage.
MY METHOD ( the invention, circa 1986) of Crankshaft Acceleration Measurement WILL NOT ALLOW this type of damage to happen. (a 60-2 TW, the NOW NAMED GM 58X)
The crankshaft position measurement (GM 24XE) IS the cause, SORRY.
Lance
MY METHOD ( the invention, circa 1986) of Crankshaft Acceleration Measurement WILL NOT ALLOW this type of damage to happen. (a 60-2 TW, the NOW NAMED GM 58X)
The crankshaft position measurement (GM 24XE) IS the cause, SORRY.
Lance