Decat and EGR bypass advice please. - Page 16

steve811 · 3rd May 2011, 21:05

Quote:

Originally Posted by chrissyboy

as your talking about designs of engines ,this engine was designed to run with the egr fitted ...

Really, and where do you get that nugget of information from then? I very much doubt if the engine was designed from scratch for that type of EGR system.

andy willi · 3rd May 2011, 21:11

Quote:

Originally Posted by andy willi

no reply yet still waiting

when will you answer this please

andy

ps i know your there and looking

Thomas · 3rd May 2011, 21:13

Gents please keep it civil, this is an interesting thread with some great points of view both for and against EGR bypass.

chrissyboy · 3rd May 2011, 21:15

Quote:

Originally Posted by andy willi

when will you answer this please

andy

ps i know your there and looking

i thoughti had answered it andy. show bits from a bmw engine that is the same unit in the 75`s

HarryM1BYT · 3rd May 2011, 21:25

Quote:

Originally Posted by billcoleman

How about this one - it claims to really boost the performance of a diesel:

http://www.sachsperformance.com/boos...ung/index.html

I remember years ago people using water injection - the increased rate of expansion of the water improves power. I can also remember in my chemistry lessons one of the lecturers talking about water improving the combustion process (something to do with "free radicals").

Water injection does work, it was used on the Merlin engine during the war to boost its performance. It still works, but....

HarryM1BYT · 3rd May 2011, 21:33

I can't get my head around it, the EGR cooling the engine at all - how does that work then?

Normally, EGR closed it gets 100% cool (well it will have picked up some heat in compression from the turbo) air. EGR opens and admits very hot burnt gasses to mix with the cool air, inlet air somewhat hotter than before - yet the cylinder still burns the same amount of diesel and generates heat...

andy willi · 3rd May 2011, 21:38

sorry chrissy show me where to find it

andy

may have missed your link to it allot going on

BigRuss · 3rd May 2011, 21:48

Quote:

Originally Posted by HarryM1BYT

I can't get my head around it, the EGR cooling the engine at all - how does that work then?

Normally, EGR closed it gets 100% cool (well it will have picked up some heat in compression from the turbo) air. EGR opens and admits very hot burnt gasses to mix with the cool air, inlet air somewhat hotter than before - yet the cylinder still burns the same amount of diesel and generates heat...

When the egr opens it lets the exhaust gases into the inlet, it contains a higher level of CO2, because of this combustion is not as high as it would normally be and the combustion temperature drops.

This reduces the the amount of NOx at idle but also has the opposite effect of producing slightly more carbon particulate in the exhaust gases.

The effect it has on engine cooling is minimal, as the engine is very thermally efficient, fitting an EGR Bypass will not cause any problems.

The EGR was fitted to the engine to meet European emission regs nothing more.

Russ

chrissyboy · 3rd May 2011, 22:35

Quote:

Originally Posted by andy willi

sorry chrissy show me where to find it

andy

may have missed your link to it allot going on

Originally Posted by rovexCDTi

What exactly were you shown and what had happened?
the exhaust valves,,and and rods, car took in more air with the piston on the way up forcing the piston down , and before the car was stripped a video was taken of an internal water leak caused by the engine being too hot .you could see the water dripping inside ..was taken with a bora scope..

but as already said something else my have caused this damage but the mechanics that did the repair are adement that is was due to the bypass, the mechanics are not workng with us ,just some that have lessons in diagnostics and our teacher bought the bits to show us a we have now started lessons about the diesel engines as t appears that alot of the future car will be diesel so we dont want to be left behind ....

Jakg · 3rd May 2011, 22:59

Quote:

Originally Posted by HarryM1BYT

I can't get my head around it, the EGR cooling the engine at all - how does that work then?

Normally, EGR closed it gets 100% cool (well it will have picked up some heat in compression from the turbo) air. EGR opens and admits very hot burnt gasses to mix with the cool air, inlet air somewhat hotter than before - yet the cylinder still burns the same amount of diesel and generates heat...

Imagine a furnace being piped air & fuel.

Imagine now replacing some of the air with hot rocks - sure, the intake temp is now higher, and the temperature of the furnace will increase - but those rocks wont burn, and so you will be slowing the rate of the reaction.

Same for the EGR - the recirculated gasses to burn, but take a lot more energy to burn, which means less heat energy overall.

3rd May 2011, 21:13	#153
Thomas This is my second home MG6 1.8T GT SE Join Date: Mar 2009 Location: Falkirk Posts: 9,510 Thanks: 106 Thanked 173 Times in 128 Posts	Gents please keep it civil, this is an interesting thread with some great points of view both for and against EGR bypass. __________________ MG6 1.8 TCi in Artic White 1975 Land Rover Series 3

3rd May 2011, 21:33	#156
HarryM1BYT This is my second home 75 Contemporary SE Mk II 2004 Man. Sal. CDTi 135ps, FBH on red diesel, WinCE6 DD Join Date: May 2010 Location: Leeds Posts: 17,273 Thanks: 2,160 Thanked 2,061 Times in 1,586 Posts	I can't get my head around it, the EGR cooling the engine at all - how does that work then? Normally, EGR closed it gets 100% cool (well it will have picked up some heat in compression from the turbo) air. EGR opens and admits very hot burnt gasses to mix with the cool air, inlet air somewhat hotter than before - yet the cylinder still burns the same amount of diesel and generates heat... __________________ Harry How To's and items I offer for free, or just to cover the cost of my expenses... http://www.the75andztclub.co.uk/foru...40#post1764540 Fix a poor handbrake; DIY ABS diagnostic unit; Loan of the spanner needed to change the CDT belts; free OBD diagnostics +MAF; Correct Bosch MAF cheap; DVB-T install in an ex-hi-line system; DD install with a HK amp; FBH servicing. I've taken a vow of poverty. To annoy me, send money.

3rd May 2011, 21:38	#157
andy willi I really should get out more....... PRE LAUNCH 75/ZT 190/XJ 550 Join Date: Jan 2007 Location: carcroft doncaster Posts: 2,866 Thanks: 101 Thanked 680 Times in 342 Posts	sorry chrissy show me where to find it andy may have missed your link to it allot going on