Engine starting an LT1 SS

Jeffsss · 02-25-2017, 11:39 AM

I am a new owner of an SS 1LE and have noticed that when starting the engine, it cranks over much longer compared to my previous LS3 in my 5th generation Camaro. I am guessing on the order of a 2 to 3 seconds longer. The LS3 would always pop right of regardless of being cold or warm. I was curious if other SS 6th generation owners have noticed that difference or if this is something that needs checked out. The engineer in my is thinking that the engine is allowed to turn over a few times to feed oil before initiating the fuel injection and spark to reduce long term mechanical wear. Any other thoughts?

avalonandl · 02-25-2017, 11:46 AM

Normal- the Direct Inj pump takes that long to pressurize to 1800 psi.

Nated421 · 02-25-2017, 01:45 PM

Normal..usually takes 2 seconds on mine also

Cornholio · 02-25-2017, 03:02 PM

As stated it's due to direct injection

Drags1998 · 02-25-2017, 04:31 PM

Do a search on this, Its been talked about No less than 10 times.

RollaMo · 02-25-2017, 04:53 PM

Quote:

Originally Posted by Jeffsss

I am a new owner of an SS 1LE and have noticed that when starting the engine, it cranks over much longer compared to my previous LS3 in my 5th generation Camaro.

Your previous LS3 didn't have "direct injection" either.

The fuel system on the LT1 runs at extremely high pressure compared to the LS series engines.

So, what your experiencing is normal as stated.

Hyper16 · 02-25-2017, 06:09 PM

Here is an excellent thread started by Glen e - "New Owner: Things that are normal"

http://www.camaro6.com/forums/showthread.php?t=448826

It is a good read for all new Camaro owners.

Zeke.Malvo · 02-25-2017, 07:51 PM

Most engines are direct injected nowadays. My Hyundai fires right up with zero delay. So did the LT4 Z06's I've driven.

Jeffsss · 02-25-2017, 10:19 PM

Thanks for all the replies. Just getting used to the differences form the 5th gen and don't even have it broke in yet. 1500 miles can't get here soon enough.

Memphis SS · 02-25-2017, 10:31 PM

Quote:

Originally Posted by Jeffsss

Thanks for all the replies. Just getting used to the differences form the 5th gen and don't even have it broke in yet. 1500 miles can't get here soon enough.

Congrats on the new ride

thescout6 · 02-26-2017, 01:53 AM

Quote:

Originally Posted by Zeke.Malvo

Most engines are direct injected nowadays. My Hyundai fires right up with zero delay. So did the LT4 Z06's I've driven.

Your Hyundai has an electric fuel pump. Our cars have a mechanical fuel pump with direct injection. Thus when you crank it it needs 2 seconds or so to build pressure. Idk what Z06s your starting but the ones I've been in/drove had the same crank as mine in cold start.

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c4racer · 02-26-2017, 10:12 AM

Mechanical fuel pump ? Seriously ? Gm has used
Electric since the 80s.

c4racer · 02-26-2017, 10:19 AM

Interesting read. There is a traditional fuel tank mounted pump plus another pump under the intake manifold that bumps the pressure up to about double or triple what fuel systems used to Run. Interesting. Thanks for that info!

http://media.chevrolet.com/media/us/...wertrains.html

That is the reason. Not the direct injection. The 3.6 in my colorado truck fires right up so guessing it uses only the tank mounted pump

Deviousin10tions · 02-26-2017, 10:47 AM

Tri-lobe camshaft: The LT1’s camshaft features an all-new “tri-lobe” at the rear, which drives the engine-mounted direct injection high-pressure fuel pump. The cam’s specifications include 14mm/13.3mm (0.551/0.524-inch) intake/exhaust lift, 200/207-crank angle degrees intake/exhaust duration at 0.050-inch tappet lift and a 116.5-degree cam angle lobe separation.
New, cam-driven fuel pump: The direct injection system features a very-high-pressure fuel pump, which delivers up to 15Mpa (150 bar), which is fed by a conventional fuel-tank-mounted pump. It is mounted in the “valley” between cylinder heads – beneath the intake manifold – which ensures noise is muffled by the intake manifold and other insulation.

02-25-2017, 11:39 AM	#1
Jeffsss Drives: 2017 Camaro SS 1LE Join Date: Jun 2009 Location: Iowa Posts: 43	Engine starting an LT1 SS I am a new owner of an SS 1LE and have noticed that when starting the engine, it cranks over much longer compared to my previous LS3 in my 5th generation Camaro. I am guessing on the order of a 2 to 3 seconds longer. The LS3 would always pop right of regardless of being cold or warm. I was curious if other SS 6th generation owners have noticed that difference or if this is something that needs checked out. The engineer in my is thinking that the engine is allowed to turn over a few times to feed oil before initiating the fuel injection and spark to reduce long term mechanical wear. Any other thoughts?

02-25-2017, 11:46 AM	#2
avalonandl Drives: 2019 ZL-1 Join Date: Feb 2009 Location: Troy, MI & Naples, FL Posts: 2,018	Normal- the Direct Inj pump takes that long to pressurize to 1800 psi. __________________ 2019 ZL-1 Acquired 4/23/21 at 6300 miles. Riverside Blue, A10, PDR. Traded in 2017 2SS with 6M and 32k miles. Continental Extreme Contact Sports. Now has 10,000 miles... 2012 Yukon XL Denali w/ 6.2 AWD

02-25-2017, 06:09 PM	#7
Hyper16 A Heartbeat Away......... Drives: Not As Fast As I Would Like To Join Date: Mar 2016 Location: Maryland Posts: 1,379	Here is an excellent thread started by Glen e - "New Owner: Things that are normal" http://www.camaro6.com/forums/showthread.php?t=448826 It is a good read for all new Camaro owners. __________________ ,,,,,,, 2016 Hyper Blue Metallic 2SS \| A8 \| MRC \| Sunroof \| Nav \| Mishimoto Catch Can \| GM CAI \| Hurst Shifter \| Borla S-Type Exhaust \| Body Color Splash Guards \| 1LE Splitter \| GM Dark Tail Lights \| ZL1 Third Brake Light \| Custom Fuel Door, Badges & Bowties \| Oracle Side Markers \| Blacked Out Stuff \| Opti-Coat Pro+ The problem with this world is stupidity. I'm not saying there should be penalties for stupidity, but why don't we just take the warning labels off everything and let the problem solve itself.

02-25-2017, 07:51 PM	#8
Zeke.Malvo Drives: 1969 Mustang MaCh1 Join Date: Nov 2015 Location: SJ Posts: 835	Most engines are direct injected nowadays. My Hyundai fires right up with zero delay. So did the LT4 Z06's I've driven. __________________ 1969 Pro-Touring MaCh 1 - CHP 427w 10.8 comp - 3140 lbs. - 460 rwhp / 490 rwtq T56 Magnum \|\| 14" 6 piston front / 13" 4 piston rear Wilwood brakes \|\| Hydraulic clutch \|\| 9" Detroit Locker \|\| TCP Coilovers \|\| Forgeline Wheels 18x10 275/35 front, 19x12 325/30 rear

02-25-2017, 01:45 PM	#3
Nated421 Drives: 2017 50th Anniversary SS Camaro Join Date: Nov 2016 Location: Charlotte Posts: 96 View My Garage	Normal..usually takes 2 seconds on mine also

02-25-2017, 03:02 PM	#4
Cornholio I need Teepee! Drives: 2019 Camaro SS 1LE Join Date: Oct 2016 Location: Highland, TX Posts: 181	As stated it's due to direct injection

02-25-2017, 04:31 PM	#5
Drags1998 Drives: 15 SilveradoLTZ,162SSVert BlazerRS Join Date: Dec 2015 Location: Minot,Maine Posts: 644	Do a search on this, Its been talked about No less than 10 times.

02-25-2017, 10:19 PM	#9
Jeffsss Drives: 2017 Camaro SS 1LE Join Date: Jun 2009 Location: Iowa Posts: 43	Thanks for all the replies. Just getting used to the differences form the 5th gen and don't even have it broke in yet. 1500 miles can't get here soon enough.

02-26-2017, 10:12 AM	#12
c4racer Drives: 2016 SS Convertible Join Date: Sep 2016 Location: California Posts: 1,108	Mechanical fuel pump ? Seriously ? Gm has used Electric since the 80s.

02-26-2017, 10:19 AM	#13
c4racer Drives: 2016 SS Convertible Join Date: Sep 2016 Location: California Posts: 1,108	Interesting read. There is a traditional fuel tank mounted pump plus another pump under the intake manifold that bumps the pressure up to about double or triple what fuel systems used to Run. Interesting. Thanks for that info! http://media.chevrolet.com/media/us/...wertrains.html That is the reason. Not the direct injection. The 3.6 in my colorado truck fires right up so guessing it uses only the tank mounted pump

02-26-2017, 10:47 AM	#14
Deviousin10tions Drives: Hyperblue 2016 1SS Join Date: Jul 2016 Location: Southern New Mexico Posts: 52	Tri-lobe camshaft: The LT1’s camshaft features an all-new “tri-lobe” at the rear, which drives the engine-mounted direct injection high-pressure fuel pump. The cam’s specifications include 14mm/13.3mm (0.551/0.524-inch) intake/exhaust lift, 200/207-crank angle degrees intake/exhaust duration at 0.050-inch tappet lift and a 116.5-degree cam angle lobe separation. New, cam-driven fuel pump: The direct injection system features a very-high-pressure fuel pump, which delivers up to 15Mpa (150 bar), which is fed by a conventional fuel-tank-mounted pump. It is mounted in the “valley” between cylinder heads – beneath the intake manifold – which ensures noise is muffled by the intake manifold and other insulation.

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