[Glenbob]

OK

#1-So the EBPV to exhaust brake modification has been made. Anything I should know about that could break something? eg. applying brake at high rpm? Seems little use unloaded and around town. I am looking forward to loading up and getting on the hilly highway.

#2-I searched and found nothing but the letter posted elsewhere on this website. Are K&N's bad? I realize there are as many opinions as there are blades of grass but I haven't seen much in the way of definitive testing evidence other that that posted on the K&N site. Sorry if this has been debated and I can't find it.

 

[Glenbob]

Never mind on the K&N question. I have found some recent posts after reconfiguring my search criteria. I still wouldn't mind feedback on the brake though.

 

[TheHammer69]

Read this to understand the potential risk of using an exhaust brake on our engines: http://www.jakebrake.com/support/faqs.php#FAQ4

Hammer

 

[maloney]

as for the K&N, i have had no problems. i found its always someones brothers uncles friend who knew a guy whos K&N filter dusted thier engine. i pull over 35psi boost (the gauge only goes to 35 so i dont know what it really is) and have had no dusting or cave in problems. but on the other hand i didnt know about the tymar intake at the time (i wasnt part of this site yet) or i would have gotten that in stead. the tymar is about $100 cheaper than the K&N set up. but if you have the K&N set up it will get the job done.

 

[Glenbob]

[ QUOTE ]
Read this to understand the potential risk of using an exhaust brake on our engines: http://www.jakebrake.com/support/faqs.php#FAQ4



[/ QUOTE ]

OK - I read it and it scares me. Anyone know of this occuring?

As far as the K&N the decision is easy. $250 cad for K$N.....$85 cad for parts to build a Tymar.

 

[Believer45]

The Jacobson brake and the exhaust brake are two totally different approaches to engine braking. The exhaust brake, which you did with your modification, closes off the exhaust pipe to create large amounts of backpressure thus slowing the engine (and the truck) down. Blocking off the exhaust creates a hissing sound, kind of like an air leak. The modification of the existing Exhaust Backpressure Valve generally will not allow backpressure high enough to cause the engine damage they refer to in the Jacobson FAQ reply.

The Jacobson brake (Jake brake) uses solenoids on the intake and exhaust valves to turn the engine itself into, basically, an air compressor. The wheels drive this "air compressor" which takes up a lot of energy which in turn slows the truck down. This popping off of the exhaust valves at max compression creates the BRRRRRRRRRRRRRRRRRRRR you hear on a semi when their Jake Brake is active. This type creates much more pressure and stress at the valve that can lead to collapsing hydraulic lifters which is a problem on the power stroke.

What you have is fine.

Dave / Believer45

 

[TheHammer69]

[ QUOTE ]
The Jacobson brake and the exhaust brake are two totally different approaches to engine braking. The exhaust brake, which you did with your modification, closes off the exhaust pipe to create large amounts of backpressure thus slowing the engine (and the truck) down. Blocking off the exhaust creates a hissing sound, kind of like an air leak. The modification of the existing Exhaust Backpressure Valve generally will not allow backpressure high enough to cause the engine damage they refer to in the Jacobson FAQ reply.

The Jacobson brake (Jake brake) uses solenoids on the intake and exhaust valves to turn the engine itself into, basically, an air compressor. The wheels drive this "air compressor" which takes up a lot of energy which in turn slows the truck down. This popping off of the exhaust valves at max compression creates the BRRRRRRRRRRRRRRRRRRRR you hear on a semi when their Jake Brake is active. This type creates much more pressure and stress at the valve that can lead to collapsing hydraulic lifters which is a problem on the power stroke.

What you have is fine.

Dave / Believer45

[/ QUOTE ]

Dave, you just described a compression brake which is the most common retarder found on heavy duty truck engines....what you fail to realize is that Jacobs makes EXHAUST BRAKES also. That link I supplied explicity uses the word exhaust brake in it's wording....therefore what it is talking about applies.

Hammer

 

[NYTPSD]

The ford EBPV is closed by oil pressure. If the exhaust pressure is excessive, greater than the oil pressure the valve opens... so it should be OK. Mine has worked for several years without a problem. BP.

 

[Glenbob]

Oh no......Will it wreck the motor or not is the question? I have only had to change pads once in 110 000 miles so I don't really need it. Anyone else got an opinion on the "valve jacking"?

I abandoned the K&N and installed the Tymar DIY version. A Donaldson filter and a 4" 45 is all it took.

The problem I am experiencing is clamp creep off of the filter. The hard plastic outlet is tapered and the pipe clamp slides off after a short period of time. It creeps off. Any thoughts?

 

[TCH777]

Go to an IH or big rig shop and get a constant torque or tension air filter clamp that will fit over the filter. The standard hose clamps are too wussy to seal that filter.

Tim

 

[Dieselfever78]

If the exhaust back pressure is bad for the engine then why would the manufacurter design it with a EBPV if it was going to cause a problem. And they know that thier are people like us out there /ubbthreads/images/graemlins/rolleyes.gif that are going to mess with stuff /ubbthreads/images/graemlins/biggrin.gif

My dad's '01 SD has the US Gear wastegated Exhaust brake on it, and it is set to 38psi of backpressure. Before the installer had it set too high(42psi) and it would kill the truck if on too steep of a grade, until it got turned down. Its still running strong /ubbthreads/images/graemlins/smokin.gif

-Michael

 

[Glenbob]

Thanks for the input folks. Downpipe is next