EGR valve

[jeff.fn02jwa]

i am thinking about replacing the egr valve on my 2.4 1992 ssrg surf she has dun 86200 miles and what i am asking is by replacing the valve will this stop the smokie surf syndrome what will be the cost and will it help with the mpg and things this valve must suffer from carbon build up what do yours lot have to say on this one rsvp

[sv1000spilot]

Why replace it? Just block it off as most people here have done

[jeff.fn02jwa]

thats one vote for the block

Why replace it? Just block it off as most people here have done

yes i could but i have read that doing this may lead to early failure of the head as the surf engine is such a hot running lump that by doing the bloke with the ball bearing may cause engine failure all that i am after is the pros & cons of renewing the valve against the ball bearing block of job

think about it before you reply its a learned response

that i am after

mi lords

[Koi]

I did my first Surf and other than less smoke, a bit more low down grunt, the MPG better it was OK. I did a lot of research on the EGR before making my mind up, heres my post from a couple of years ago


Alot of people have done the mod and noticed no difference, thats probably because the valve is already knackered and failed shut.
I did a alot of searching when this subject first came up a few years back and the following is my take on the info I found.

Exhaust Gas Recirculation Valve
Exhaust gas recirculation (EGR) systems were introduced in the early '70s to reduce an exhaust emission that was not being cleaned by the other smog controls. Oxides of nitrogen (NOx) are formed when temperatures in the combustion chamber get too hot. At 2500 degrees Fahrenheit or hotter, the nitrogen and oxygen in the combustion chamber can chemically combine to form nitrous oxides, which, when combined with hydrocarbons (HCs) and the presence of sunlight, produces an ugly haze in our skies known commonly as smog.

So basically it recirculates some of the exhaust gases back in to the block to reduce NOx. It says in doing this it reduces the operating temperature of the block, I have read many many articles on this topic. Some written by the Green/environment people who advocate you should never disconnect the EGR because of the detremental effects it has on your engine, of course they would, nothing to do with the environment of course.
Some by Profs. of motor mechanics, who don't deny in disconnecting the valve it raises the NOx levels released to atmosphere (our MOT laws in England don't test for NOx). They also claim that lowering the operating temperature is not a bad thing except the recirculated gases cause hot spots and on cast heads thats not good. The recirculated gases are reintroduced into the block on one side, so cooling that area not the far side of the engine, one side hotter than the other.
The other down side of the EGR is, in reintroducing the gases back in to the engine, this will place an even greater demand on engine oil performance through increased soot generation and acid levels. So you need to make sure regular oil changes are strictly adhered to.
The EGR also comes with another downside slight loss of power and decreased MPG.
The very early valves (like on the early surfs) were single diaphram valves that open on positve pressure (some open on negative pressure) these early valves entailed a mass of vacuum hoses within the engine bay. They were not that reliable, hoses can rot, split, the diaphram within the valve can perish, become perforated. All this leads to a non or poorly operational valve.
This system had many problems. It would often open to much, which caused a hesitation on acceleration as massive amounts of recirculated exhaust hit the combustion chamber. The peak temperature NOx is produced at only occurs when the engine is under full load, not all the time so with older style valves it recirculated all the time.
The newer valves are controlled by solonoids, so control the recirculation better only reintroducing the gases when the engine is under full load. So are more reliable don't effect performance so much or the MPG.
I have disconnected my EGR, I personally noticed more low down torque on my surf and better MPG. Yes my head has cracked 1 year after I got the motor and 10 months after disconnecting the EGR.
There are some who's heads have cracked and have never disconnected the EGR.
After replacing my head I reconnected the EGR for three weeks. Its diconnected again, couldn't stand the smoke it throws out the exhaust, the less grunt on acceleration and the worse MPG.
I hope this answers your question with an unbiased opinion, there are the greens who write articles on the EGR saying how great it is and mechanics who write articles saying the early valves were poor.
Thats the info, you make up your own mind.

[jeff.fn02jwa]

kio you are a

I did my first Surf and other than less smoke, a bit more low down grunt, the MPG better it was OK. I did a lot of research on the EGR before making my mind up, heres my post from a couple of years ago


Alot of people have done the mod and noticed no difference, thats probably because the valve is already knackered and failed shut.
I did a alot of searching when this subject first came up a few years back and the following is my take on the info I found.

Exhaust Gas Recirculation Valve
Exhaust gas recirculation (EGR) systems were introduced in the early '70s to reduce an exhaust emission that was not being cleaned by the other smog controls. Oxides of nitrogen (NOx) are formed when temperatures in the combustion chamber get too hot. At 2500 degrees Fahrenheit or hotter, the nitrogen and oxygen in the combustion chamber can chemically combine to form nitrous oxides, which, when combined with hydrocarbons (HCs) and the presence of sunlight, produces an ugly haze in our skies known commonly as smog.

So basically it recirculates some of the exhaust gases back in to the block to reduce NOx. It says in doing this it reduces the operating temperature of the block, I have read many many articles on this topic. Some written by the Green/environment people who advocate you should never disconnect the EGR because of the detremental effects it has on your engine, of course they would, nothing to do with the environment of course.
Some by Profs. of motor mechanics, who don't deny in disconnecting the valve it raises the NOx levels released to atmosphere (our MOT laws in England don't test for NOx). They also claim that lowering the operating temperature is not a bad thing except the recirculated gases cause hot spots and on cast heads thats not good. The recirculated gases are reintroduced into the block on one side, so cooling that area not the far side of the engine, one side hotter than the other.
The other down side of the EGR is, in reintroducing the gases back in to the engine, this will place an even greater demand on engine oil performance through increased soot generation and acid levels. So you need to make sure regular oil changes are strictly adhered to.
The EGR also comes with another downside slight loss of power and decreased MPG.
The very early valves (like on the early surfs) were single diaphram valves that open on positve pressure (some open on negative pressure) these early valves entailed a mass of vacuum hoses within the engine bay. They were not that reliable, hoses can rot, split, the diaphram within the valve can perish, become perforated. All this leads to a non or poorly operational valve.
This system had many problems. It would often open to much, which caused a hesitation on acceleration as massive amounts of recirculated exhaust hit the combustion chamber. The peak temperature NOx is produced at only occurs when the engine is under full load, not all the time so with older style valves it recirculated all the time.
The newer valves are controlled by solonoids, so control the recirculation better only reintroducing the gases when the engine is under full load. So are more reliable don't effect performance so much or the MPG.
I have disconnected my EGR, I personally noticed more low down torque on my surf and better MPG. Yes my head has cracked 1 year after I got the motor and 10 months after disconnecting the EGR.
There are some who's heads have cracked and have never disconnected the EGR.
After replacing my head I reconnected the EGR for three weeks. Its diconnected again, couldn't stand the smoke it throws out the exhaust, the less grunt on acceleration and the worse MPG.
I hope this answers your question with an unbiased opinion, there are the greens who write articles on the EGR saying how great it is and mechanics who write articles saying the early valves were poor.
Thats the info, you make up your own mind.

kio you are a star have you ever thought of starting up a magazine and & editing it for hi lux surfs and pick ups as for my egr valve you have helped me make up my mind many thanks m8

[yoshie]

kio you are a star have you ever thought of starting up a magazine and & editing it for hi lux surfs and pick ups as for my egr valve you have helped me make up my mind many thanks m8

Go for it Jeff had mine bloced for ages.
And again a big thanks for picking that up today, it was great to meet up with you lot. See you on 15th of failing that at D9

[jeff.fn02jwa]

cool m8

Go for it Jeff had mine bloced for ages.
And again a big thanks for picking that up today, it was great to meet up with you lot. See you on 15th of failing that at D9

cool m8 i will see you there but i cant stay as: i am starting work at 1215 at bellshill but i plan to be there to have the crack an to wish you happy surfing you can think o me driving me lorry and you lot mud surfing you lucky B******S but you will see me at the forest drive at the bird field Argyll its is 2 days o forest mud plugging like you have never seen

[coolsv650]

i am thinking about replacing the egr valve on my 2.4 1992 ssrg surf she has dun 86200 miles and what i am asking is by replacing the valve will this stop the smokie surf syndrome what will be the cost and will it help with the mpg and things this valve must suffer from carbon build up what do yours lot have to say on this one rsvp

my twopenneth worth (and a lot of it is my theory)

The EGR valve and its ports are located at the back of the engine, well away from the radiator, water pump and the coolest water.

now call me a bluff old traditionalist, and dumping hot exhaust gas into the inlat manifold will heat up the incoming charge, but mostly to the rear cylinder, will heat up that cylinder more that the rest, also you have a hot pipe running round the back of the head. Putting 2&2 together it can't be that good to heat up the head and all the heads I have seen have cracked in the No4 cylinder.

I removed mine when I did the head and have had no problems

[jeff.fn02jwa]

my twopenneth worth (and a lot of it is my theory)

The EGR valve and its ports are located at the back of the engine, well away from the radiator, water pump and the coolest water.

now call me a bluff old traditionalist, and dumping hot exhaust gas into the inlat manifold will heat up the incoming charge, but mostly to the rear cylinder, will heat up that cylinder more that the rest, also you have a hot pipe running round the back of the head. Putting 2&2 together it can't be that good to heat up the head and all the heads I have seen have cracked in the No4 cylinder.

I removed mine when I did the head and have had no problems

please can you tell me if i read you post right you removed the (EGR VALVE ALL TOGETHER) or did pick it up wrong you did the ball-bearing block off job if you did the complete EGR valve how did you make up the bits to close the holes there the piping was can you do a write up and post some pics and if it was just the bloke of with the ball-bearing thanks for the time that you sten on posting on this hot topic