will 10:1 compression pass emissions.help

diponyou50

Member

Apr 21, 2005

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Jun 9, 2005

#1

• Jun 9, 2005

• #1

i need to know if 10:1 compression will pass emissiions.i am about to trade fro a stang with the compression and neeed to know if it will pass with the stock h pipe and no air pump

 

9

93RiceKillinGT

New Member

Jul 15, 2003

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somers Ct

Jun 9, 2005

#2

• Jun 9, 2005

• #2

Keep the cats and put the smog pump on and you should pass ok! Im in the same situation as you. I have a new 306 with 10:1 compression.

 

diponyou50

Member

Apr 21, 2005

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Jun 9, 2005

#3

• Jun 9, 2005

• #3

did u pass

 

9

93RiceKillinGT

New Member

Jul 15, 2003

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somers Ct

Jun 9, 2005

#4

• Jun 9, 2005

• #4

I haven't been called up yet to go, but my engine builder said to keep all the emmisions stuff and and fine tune everything and that I should pass ok.

 

crash

Founding Member

Aug 12, 1999

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Dallas, Tulsa

Jun 9, 2005

#5

• Jun 9, 2005

• #5

True. CR is not a determining factor, the TUNE is.

For example, if you have a dyno graph showing say 12:1, it should be OK.

Lean enough to not cause excess Hydrocarbons (Too much fuel), and not be too lean and cause excessive Oxides of Nitrogen (Not enough fuel).

Everything else they check for should be just fine.

 

diponyou50

Member

Apr 21, 2005

138

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Jun 9, 2005

#6

• Jun 9, 2005

• #6

i dont have a cam and heres a list of stuff on motor

edelbrock perf intake
24 injectors
76 maf
ported heads 1.6 rockers
70 mm tb
headers
i herd that the air pump dosent do anything for smog anymore,and as long as it has the cats its all good.but i was mainly concerned aobut the compression

 

diponyou50

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Apr 21, 2005

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Jun 9, 2005

#7

• Jun 9, 2005

• #7

ttt

 

nosmatt

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Oct 13, 2000

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Bass Lake, Ca

Jun 9, 2005

#8

• Jun 9, 2005

• #8

high NoX is from high combustion chamber temps, not neccisarily from being lean, being lean will sometimes cause a high chamber temp......unfortunately, unless your have access to a mustand dyno that can simulate load at steady state driving, you will never know your true a/f (aside from a WBO2).... rw dynos measure at WOT, well EGR is not used at WOT, thus ya know nothin from a dyno a/f reading....

i hope your egr is functional.......or there is no way to pass. EGR lowers combustion chamber temps at cruise, and thus reduces NOX emmisions......

 

nosmatt

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Oct 13, 2000

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Bass Lake, Ca

Jun 9, 2005

#9

• Jun 9, 2005

• #9

diponyou50 said:

i herd that the air pump dosent do anything for smog anymore,and as long as it has the cats its all good.but i was mainly concerned aobut the compression

Click to expand...

sorry, but i disagree.

the smog pump puts fresh air into the h pipe, and thus converters. the converters get hot, the un burned HC's get burned in the cats, UNLESS there is not enough O2 for cumbustion to occur........... no smog pump, with stang cats means not all the unburned HC's will be eliminated, and your tailpipe emmisions will be high.

newer, more efficient converters do not require additional air to be pumped in, but the old dogs on our cars certainly do.

 

diponyou50

Member

Apr 21, 2005

138

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Jun 9, 2005

#10

• Jun 9, 2005

• #10

how can i find some diagrams that can show me how all the smog stuff is connected.and how hard is it to connect the smog pump,and is it nessecary.any help please

 

CrazyCobra

New Member

Apr 25, 2005

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Ontario

Jun 9, 2005

#11

• Jun 9, 2005

• #11

i need to know if 10:1 compression will pass emissiions.i am about to trade fro a stang with the compression and neeed to know if it will pass with the stock h pipe and no air pump

Click to expand...

9.7 to 1, e-cam, aluminum performer heads, 1.7 rockers, 75mm TB/EGR, 19lbs injectors @ 42-44psi, all emissions control devices installed and functioning. This passed with flying colours.
I would put the air pump back on.

 

stang22

Active Member

Jan 29, 2003

1,318

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38

Washington, D.C.

Jun 9, 2005

#12

• Jun 9, 2005

• #12

nosmatt said:

sorry, but i disagree.

the smog pump puts fresh air into the h pipe, and thus converters.

Click to expand...

I thought the smog pump took "hot" air from the back of the heads and pumps it to the cats to help them heat up quicker, therefore burning more HC's?

Tim

 

B

Biggeley

New Member

Mar 4, 2003

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Jun 9, 2005

#13

• Jun 9, 2005

• #13

Nopers.. The smog pump pushes fresh air into both the exhaust ports on your head AND into the exhaust system before the cats.. It only goes one way.. From what I remember, air is pumped into the heads only near startup for reduce cold-startup emmissions.. And fresh air to the cats all the time..

 

diponyou50

Member

Apr 21, 2005

138

11

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Jun 9, 2005

#14

• Jun 9, 2005

• #14

well i have all the stuff for the smog pump i just need to get it installed so im taking it to a mustang shop and theya re gonna do it.(i know i know i should do it but i have absolutly no place to work on it).
what about the egr?what do i have to worry about there

 

Michael Yount

Mustang Master

Apr 10, 2002

9,039

6

79

Charlotte, NC

Jun 9, 2005

#15

• Jun 9, 2005

• #15

Biggley's pretty close as usual. I'd add - the air pump is the source of excess O2 that is required for chemical reactions in the exhaust stream that are catalyzed by the cats. The reactions convert enough HC, CO and NOx remaining from the combustion chamber burn into harmless H2O and CO2 to allow the vehicle to meet the emissions standards. So the air pump and cats work hand in hand.

The cats have to reach a certain temperature (light-off) to be effective. In order to allow them to reach that temp ASAP on a cold start up, the thermactor valves divert air injection (cold air/excess O2 from the smog pump) to the back of the heads which connect with the exhaust ports of each valve. This allows excess O2 to enter the exhaust system and still allows the cats to heat up as quickly as possible. Once things are warm enough and the cats are working, the thermactors divert the air/excess O2 directly into the cats. There are conditions when the air pump bypasses all or a portion of the air - and then virtually none gets injected.

 

B

bcmbcmbcm

20+ Year Stangneter

Jan 29, 2003

455

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16

Jun 9, 2005

#16

• Jun 9, 2005

• #16

How do you know if a smog pump is going bad?

I have a car that won't pass smog, I just put it cap, rotor, plugs, and wire, overdue anyway so I wanted to elimintate this. I haven't re-tested yet but I don't know where to begin!

 

Michael Yount

Mustang Master

Apr 10, 2002

9,039

6

79

Charlotte, NC

Jun 9, 2005

#17

• Jun 9, 2005

• #17

...oh, one more thing--all else equal, higher static compression ratio increases cylinder pressures AND temperatures - increasing production of NOx. Be sure your egr and cats/air pump are there and working - you'll need them for NOx reduction.

 

wake

New Member

Sep 22, 2004

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Memphis,TN

Jun 9, 2005

#18

• Jun 9, 2005

• #18

Y not run it through now to see where you stand?

 

crash

Founding Member

Aug 12, 1999

337

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Dallas, Tulsa

Jun 18, 2005

#19

• Jun 18, 2005

• #19

Yup. EGR is a BIG player, and don't tune it rich (Best to have a flip switch, one race, one street)

You can go to high flow converters and be good too. CR HAS NO FACTOR... AS LONG AS YOU BURN ALL THE FUEL. (HC emissions). Most high compression engines do... That is the point after all. Heh!

Careful with the air pump.SOME (FEW) inspectors will know it should be there and at least LOOK operational... HINT HINT... So if you do a delete, you may want to get it dirty so it doesn't attract attention.

Yes, I am a licenced inspector (Expired when OK did away with inspections), along with all the rest of the crap in my head...

I DO NOT recommend "Running it through" unless you are confident. In TX, the machine is online with the DPS database, and you can get a fix it ticket, which means you will have 10-30 days to correct. Not always cost effective.